1

V6 Calibra
Full Fault Code Description Table

Details + Notes

13 : O2/lambda sensor open circuit

 Fault is stored if:

• Oxygen sensor voltage is in the range of 350 mV to 550 mV
  (Circuit interruption, oxygen sensor defective)
• Above condition must be fulfilled for at least 2.5 s (i.e. Normal highly varying changes are not seen).

Conditions to enable trouble code recognition

• The trouble code recognition is enabled, if the following conditions are fulfilled consecutively:
  1.) Coolant temperature is greater than 70 °C (158 °F);
  2.) Condition 1.) fulfilled for 3 min;
  3.) Engine load signal is greater than 1.5 ms;
  4.) After conditions 1.) to 3.) are fulfilled, waiting period of 5 s elapsed;
  5.) Following trouble code not recognised: 73, 74;

Replacement Value:

• 450 mV (oxygen sensor closed loop control is disabled)

ECU Terminals:
28, 10

TEST:
0.1 to 1.0 v DC varying rapidly with accelerator

NOTES:
When the ECU is in O2 sensor open loop mode (for a prolonged period) you will notice a drop in fuel economy. Lambda/O2 sensors should be replaced every 5 years/50,000 miles. Their response often degrades over time. This results in poor fuel economy but may not necessarily be bad enough to fulfil the fault code recognition conditions as detailed above.

14 : Coolant Temperature Sensor - Voltage Low

Fault is stored if:

• Coolant temperature is greater than 140 °C (284 °F)
  (Short circuit to ground)
• 80 deg C should give ~ 1.3v
• 110 deg C should give ~ 0.6v

Replacement Value:

• Intake air temperature > 0.4 °C (32.0 °F):
  80 °C (176 °F) is used as replacement value
  Intake air temperature < 0.4 °C (32.0 °F):
  Intake air temperature is used as replacement value for 180 s after engine start, and after that back to 80 °C (176 °F).

Effect:

• The learn functions (oxygen sensor control, idle air control and knock control) are locked and the last valid values are used for calculation.

ECU Terminals:
45, 30

TEST :
 20 deg C = 3.0 to 3.5 v DC
 80 deg C = 1.0 to 1.3 v DC

NOTES:
CTS faults can cause poor starting, poor running and bad fuel economy.

15 : Coolant Temperature Sensor - Voltage High

Fault is stored if:

• Intake air temperature > -20 °C (-4 °F)
• Coolant temperature < -35 °C (-31 °F)
  (Short circuit to voltage or circuit interruption)

Replacement Value:

• Intake air temperature > 0.4 °C (32.0 °F):
  80 °C (176 °F) is used as replacement value
  Intake air temperature < 0.4 °C (32.0 °F):
  Intake air temperature is used as replacement value for 180 s after engine start, and after that back to 80 °C (176 °F).

Effect:

• The learn functions (oxygen sensor control, idle air control and knock control) are locked and the last valid values are used for calculation.

ECU Terminals:
45, 30

TEST :
 20 deg C = 3.0 to 3.5 v DC
 80 deg C = 1.0 to 1.3 v DC

NOTES:
CTS faults can cause poor starting, poor running and bad fuel economy.

16 : Knock Signal Circuit 1
cylinders 2-4-6 (front)

 
Fault is stored if:

• Engine speed is greater than 1400 rpm
• Control sensor reference voltage for knock sensor is less than 20 mV
  (Value varies depending on the engine speed)
• Knock sensor voltage is evaluated and produces an implausible resulting value for 20 consecutive checks (at 100 ms intervals)

Replacement Value:

• Engine load signal is greater than 2 ms and coolant temperature is greater than 38 °C (100 °F):
  The control unit retards the spark timing by up to 13.5 °Crank Angle for reasons of safety (Value of retard varies depending on the engine speed)

ECU Terminals:
11, 30

TEST:
Knock Sensor Active = 1 v DC (peak to peak)

> more info here <

17 : Knock Signal Circuit 2
cylinders 1-3-5 (rear)

 
Fault is stored if:

• Engine speed is greater than 1400 rpm
• Control sensor reference voltage for knock sensor is less than 20 mV
  (Value varies depending on the engine speed)
• Knock sensor voltage is evaluated and produces an implausible resulting value for 20 consecutive checks (at 100 ms intervals)

Replacement Value:

• Engine load signal is greater than 2 ms and coolant temperature is greater than 38 °C (100 °F):
  The control unit retards the spark timing by up to 13.5 °CA for reasons of safety.
  (Value of retard varies depending on the engine speed)

ECU Terminals:
29, 30

TEST:
Knock Sensor Active = 1 v DC (peak to peak)

> more info here <

18 : Knock Control Module; Replace Electronic Control Unit (ECU)

 
Fault is stored if:

• Coolant temperature is less than 38 °C (100 °F)

or

• Engine load signal is less than 1.5 ms
  (Value varies depending on the engine speed)
• Engine running in engine speed range 600 rpm to 5000 rpm
• The ECU performs an internal knock sensor circuit test every 253 combustions. If this test is not passed, the trouble code is set (ECU fault).

Replacement Value:

• Engine load signal is greater than 2.0 ms and coolant temperature is greater than 38 °C (100 °F):
  The control unit retards the spark timing by up to 13.5 °CA for reasons of safety.
  (Value varies depending on the engine speed)

ECU Terminals:
Internal ECU Function Error: The ECU thinks that there's a problem with the internal Knock Sensor function block.

NOTES:
Disconnect battery (for at least 15 min) to clear fault codes.
Check and clean both knock sensor connectors in the engine bay.
Check knock sensor heads are tightened to the engine block to the correct torque (20 nm)
With the battery disconnected check main ECU plug for water ingress and corrosion on pins (interior drivers footwell).
Start the car, drive sensibly until engine is warm. Test engine through the gears and check for reoccurrence of fault code 18.
If this fault code persists suspect faulty ECU (fault on knock sensor signal input stage).

19 : Incorrect RPM Signal
Crankshaft Sensor

A bad RPM signal from Crankshaft Impulse sensor (inductive pulse pick up - P35). Sensor located at front bottom of engine block.

Fault is stored if:

• Since ignition ON, there has been already one start with correct synchronisation
• Engine speed is greater than 520 rpm
• Incorrect engine speed signal recognised
  (intermittent problems, missing teeth, wrong reference point, incorrect gap position, etc.)

EFFECTS:
Current values are used for the mixture adaptation and demand adaptation.
Calculated values are used for idle control adaptation and characteristic curve adaptation.

ECU Terminals:
48, 49

TEST:
 cranking : 4v AC + (peak to peak)
 idle : 8v AC + (peak to peak)
 cruise : 14v AC + (peak to peak)

NOTES:
Check Crankshaft Impulse sensor and cable shielding. Sensor outputs AC pulse to Motronic ECU.

21 : Throttle Position Sensor (TPS) Voltage High

Fault is stored if:

• Throttle position sensor voltage > 4.8 V  (Short circuit to voltage)

Replacement Value:

• The ECU calculates with a throttle valve angle of 30 °.
  Other functions recognise only partial load and full load.
  Recognition depends on the engine load, the engine speed, and the mass air flow meter signal.

ECU Terminals:
53, 12, 30

TEST:
Ignition on and leave engine off
Measure voltage across pins xx and xx on Motronic ECU or use piercing probe on cables xx and xx from TPS sensor connector.
Foot off accelerator pedal = 0.35 to 0.87 volts DC
Foot fully pressed down on accelerator pedal = 4.2 to 4.8 volts DC

22 : Throttle Position Sensor (TPS) Voltage Low

Fault is stored if:

• Throttle position sensor voltage is less than 0.1 V
  (Short circuit to ground)

Replacement Value:

• The ECU calculates with a throttle valve angle of 30 °.
  Other functions recognise only partial load and full load.
  Recognition depends on the engine load, the engine speed, and the mass air flow meter signal.

ECU Terminals:
53, 12, 30

TEST:
Ignition on and leave engine off
Measure voltage across pins xx and xx on Motronic ECU or use piercing probe on cables xx and xx from TPS sensor connector.
Foot off accelerator pedal = 0.35 to 0.87 volts DC
Foot fully pressed down on accelerator pedal = 4.2 to 4.8 volts DC

 
Fault is stored if:

• Final stage diagnosis in ECU (Short circuit to voltage)  fails

EFFECTS:
The defective injector is no longer actuated by the Motronic ECU. The other injectors function normally.

ECU Terminals:
injector1 : 17, 14
injector2 : 16, 14
injector3 : 35, 14
injector4 : 34, 14
injector5 : 15, 14
injector6 : 33, 14

NOTES:
Expected pulsed signals to injectors (can be measured with a scope):
 timed pulse to injectors in milliseconds:
 cold cranking = 11 to 12 ms
 hot cranking = 3.1 + ms
 cold idle = 4.5 + ms
 hot idle = 3.1 to 3.3 ms

Crankshaft Sensor - inductive pulse pick up sensor (P35)

Fault is stored if:

• Ignition ON
• Engine speed is less than 23 rpm
• Following trouble codes not stored: 19
• Since ignition ON, there has not yet been a start with correct synchronisation

ECU Terminals:
48, 49

TEST:
 cranking : 4v AC + (peak to peak)
 idle : 8v AC + (peak to peak)
 cruise : 14v AC + (peak to peak)

NOTES:
Trouble code 31 is always displayed when the ignition is switched on. As soon as an engine speed signal is received from the inductive pulse pick-up sensor (crankshaft sensor)  on starting, the fault is deleted and does not remain stored if the system is intact .

 

Fault is stored if:

• Oxygen sensor voltage is less than 90 mV
  (Short circuit to ground)
• Above condition must be fulfilled for at least 2.5 s .

Conditions to enable trouble code recognition

• The trouble code recognition is enabled, if the following conditions are fulfilled consecutively:
  1.) Coolant temperature is greater than 70 °C (158 °F);
  2.) Condition 1.) fulfilled for 3 min;
  3.) Engine load signal is greater than 1.5 ms;
  4.) After conditions 1.) to 3.) are fulfilled, waiting period of 5 s elapsed;
  5.) Following trouble code not recognised: 73, 74;

Replacement Value:

• 450 mV (oxygen sensor closed loop control is disabled)

ECU Terminals:
28, 10

 

Fault is stored if:

• Oxygen sensor voltage is greater than 1100 mV
  (Short circuit to voltage)
• Above condition must be fulfilled for at least 2.5 s .

Conditions to enable trouble code recognition

• The trouble code recognition is enabled, if the following conditions are fulfilled consecutively:
  1.) Coolant temperature is greater than 70 °C (158 °F);
  2.) Condition 1.) fulfilled for 3 min;
  3.) Engine load signal is greater than 1.5 ms;
  4.) After conditions 1.) to 3.) are fulfilled, waiting period of 5 s elapsed;
  5.) Following trouble code not recognised: 73, 74;

Replacement Value:

• 450 mV (oxygen sensor closed loop control is disabled)

ECU Terminals:
28, 10

Fault is stored if:

• Oxygen sensor integrator (internal control unit value for evaluation of oxygen sensor control) has exceeded upper limit of 1,2
  Air/fuel mixture constantly too lean

Conditions to enable trouble code recognition

• Coolant temperature is less than 85 °C (185 °F)
• Intake air temperature is less than 30 °C (86 °F)
• Following trouble codes not stored: 73, 74
• Engine load signal is greater than 0.8 ms
• Above conditions must be fulfilled for at least 10 s .

ECU Terminals:
28, 10

 

Fault is stored if:

• Oxygen sensor integrator (internal control unit value for evaluation of oxygen sensor control) has fallen below lower limit of 0,8
  Air/fuel mixture constantly too rich

Conditions to enable trouble code recognition

• Coolant temperature is less than 85 °C (185 °F)
• Intake air temperature is less than 30 °C (86 °F)
• Following trouble codes not stored: 73, 74
• Engine load signal is greater than 0.8 ms
• Above conditions must be fulfilled for at least 10 s .

ECU Terminals:
28, 10

Secondary Air Pump - Voltage Low

Fault is stored if:

Final stage diagnosis in control unit fails
Short circuit to ground or circuit interruption - wiring or failed air pump

ECU Terminals:
23

TEST :
Check: Interruption of Voltage Supply Circuit

• Ignition OFF
• Remove electrical component from socket: K12 Relay - Secondary Air Injection
• Turn Ignition ON
• Measure voltage between the following terminals:
  K12 Relay - Secondary Air Injection Socket Terminal 4 ("+") & Ground (vehicle body "-")
• Signal should be  greater than 11 v DC
• If not check wiring, replace air pump

Secondary Air Pump - Voltage Low

Fault is stored if:

Final stage diagnosis in control unit fails
Short circuit to voltage - wiring or failed air pump

ECU Terminals:
23

TEST :
Check: Interruption of Voltage Supply Circuit

• Ignition OFF
• Remove electrical component from socket: K12 Relay - Secondary Air Injection
• Turn Ignition ON
• Measure voltage between the following terminals:
  K12 Relay - Secondary Air Injection Socket Terminal 4 ("+") & Ground (vehicle body "-")
• Signal should be  greater then 11 v DC
• If not check wiring, replace air pump

Fault is stored if:

• Engine not in operating condition: Start
• 180 s elapsed time since engine start
• Battery voltage is less than 10 V

EFFECTS :

• The ECU compensates for the effect of the battery voltage to a certain extent.
• The learn functions (oxygen sensor control, idle air control and knock control) are locked and the last valid values are used for calculation.
• You can get all sorts of strange electrical problems if the voltage supply is too low. Expect spurious sensor faults.

ECU Terminals:
37, 19

See Battery Test Procedure

NOTES:
Low voltage usually results from a failed alternator or faulty battery. If the alternator is not charging then renew. If the battery is not holding charge then it's a new battery required.

Fault is stored if:

• Battery voltage is greater than 16 V

EFFECTS :

• The ECU compensates for the effect of the battery voltage to a certain extent.
• The learn functions are locked and current values are used for calculation.
• High voltages

ECU Terminals:
37, 19

See Battery Test Procedure

NOTES:
High voltage usually results from a failing alternator and/or faulty battery. If the alternator is identified as faulty (with high voltage) it is highly recommended to change the battery for new as well as the alternator. It may be possible to repair the alternator (replace voltage rectifier) but a new or reconditioned unit is recommended.

Fault is stored if:

• Final stage diagnosis in control unit fails due to a high supply voltage
  Suspect short circuit to voltage

ECU Terminals:
22, 24

NOTES:
High supply voltage has disabled the ABS ECU, Airbag ECU or main Motronic ECU. Check if ABS and Airbag instrument light 'tell tales' briefly illuminate and are then extinguished on star up. If not investigate supply to the one which isn't working.

Fault is stored if:

• Final stage diagnosis in control unit
  (Short circuit to ground)

ECU Terminals:
3, 24

Fault is stored if:

• Final stage diagnosis in control unit
  (Short circuit to voltage)

ECU Terminals:
3, 24

Fault is stored if:

• ECU hardware failure (EPROM / ROM defective)
• Fault detected during Motronic ECU start up self diagnostics.
• Serious fault was detected during last run causing Motronic to shutdown.

NOTES:
The normal ECU functions are carried out as far as possible but this code is logged when the Motronic encounters a serious error.

Fault is stored if:

• Short circuit to voltage (+) detected

ECU Terminals:
4, 24

EFFECTS :
The ECU learn functions for Oxygen Sensor, Idle Air Control and Knock Sensor are locked at the last 'good' values used.

TEST:
Check that the idle air control valve is getting a 12v feed. Disconnect the plug from the idle valve. Test for 12v between pin 2 inside the plug and vehicle earth (ground).

NOTES:
Remove and clean ISCV (Idle Air Control Valve) and clean out the attached length of rubber hose. Clean with "carb cleaner" or similar solvent. Valve is known to become sticky and resistant to movement.

 

Fault is stored if:

• Short circuit to ground (-) or break in wire detected

ECU Terminals:
4, 24

EFFECTS:
The ECU learn functions for Oxygen Sensor, Idle Air Control and Knock Sensor are locked at the last 'good' values used.

TEST:
Check that the idle air control valve is getting a 12v feed. Disconnect the plug from the idle valve. Test for 12v between pin 2 inside the plug and vehicle earth (ground).

NOTES:
Remove and clean ISCV (Idle Air Control Valve) and clean out the attached length of rubber hose. Clean with "carb cleaner" or similar solvent. Valve is known to become sticky and resistant to movement.

 

 

Fault is stored if:

• Short circuit to ground

ECU Terminals:
5, 19

TEST:
Check for voltage supply to valve. Disconnect the wiring plug from the valve assembly. Measure voltage between pin A inside the plug and vehicle body (ground). Should be > 11 v DC.

NOTES:
Test using Tech1/2 - Fuel Tank Vent Valve actuator test
The tank vent valve is actually a carbon canister purge valve as this is where the fuel tank vent routes through. It is located under the alternator cooling fan ducting; the carbon canister is mounted up in the drivers side wing, behind the wheel arch cover.
When the controlled carbon canister purge valve is opened the engine is supplied with additional fuel (provided there is adequate fuel vapour already stored in the carbon canister). This can result in brief oscillations in engine rpm.

 

Fault is stored if:

• Short circuit to positive (battery live)

ECU Terminals:
5, 19

TEST:
Check for voltage supply to valve. Disconnect the wiring plug from the valve assembly. Measure voltage between pin A inside the plug and vehicle body (ground). Should be > 11 v DC.

NOTES:
Test using Tech1/2 - Fuel Tank Vent Valve actuator test
The tank vent valve is actually a carbon canister purge valve as this is where the fuel tank vent routes through. It is located under the alternator cooling fan ducting; the carbon canister is mounted up in the drivers side wing, behind the wheel arch cover.
When the controlled carbon canister purge valve is opened the engine is supplied with additional fuel (provided there is adequate fuel vapour already stored in the carbon canister). This can result in brief oscillations in engine rpm.

 

Fault is stored if:

• Short circuit to ground OR engine air intake temperature > 140 degrees C

EFFECTS:
ECU uses -33 deg C as a substitute value.
The learn functions (oxygen sensor control, idle air control and knock control) are locked and the last valid values are used for calculation.

ECU Terminals:
44, 30

TEST :
Use multi-meter to measure voltage between pin 1 in the connector socket (not the sensor pin) and the vehicle body (ground). Reading should be between 4.8 and 5.2 volts (DC) with the engine running

 

Fault is stored if:

• Short circuit to ground OR engine air intake temperature < -35 degrees C

ECU only checks Air Intake Temp after the first 180 secs of engine running time

EFFECTS:
ECU uses -33 deg C as a substitute value.
The learn functions (oxygen sensor control, idle air control and knock control) are locked and the last valid values are used for calculation.

ECU Terminals:
44, 30

TEST :
Use multi-meter to measure voltage between pin 1 in the connector socket (not the sensor pin) and the vehicle body (ground). Reading should be between 4.8 and 5.2 volts (DC) with the engine running

 

Fault is stored if:

• Engine is not starting up
• RPM > 520
• Mass Air Flow Meter signal < 3 kg/hr (equivalent)

In this mode the ECU now ignores the AFM signal and uses a set of replacement values based on engine RPM and Throttle Valve Position Sensor signal. This will cause a noticeable drop in performance with the engine feeling more 'hesitant'.

Check wiring loom for short to ground and AFM connector for poor connection. May indicate failure of Mass Air Flow Meter.

ECU Terminals:
7, 30, 37

NOTES
The V6 uses a Hot Film Type Mass Air Flow Meter - utilises ceramic tile.
This is more reliable and causes less restriction than the 8v/16v hot wire type.
If AFM and TPS signals are both bad the ECU uses only two replacement values based solely on engine RPM.

• Engine under load and RPM < 2000   -   3.0 ms is used
• Engine under load and RPM > 2000   -   4.5 ms is used

TEST:
Disconnect plug to mass air flow sensor
Engine running at idle speed & engine run up to normal operating temperature.
All electrical consumers turned off (stereo, fan, heater etc).
Accelerator pedal not actuated (foot off accelerator).
Measure reading between pin 3 (+) inside the mass air flow sensor plug (loom side) and vehicle ground (-). Normal feed value > 11 v DC
Power to pin 3 is routed through the Fuel Pump Relay.

Also possible to intercept return signal to ECU using piercing probes between pins 2 (-) and 4 (+) on the Mass Air Flow Meter. Normal idle value is between 0.56 and 0.86 volts DC.
This equates to 8 - 18 kg/hr air mass flow.
Snap accelerate should see the voltage rise > 3 v

 

Fault is stored if:

• RPM < 6520
• Mass Air Flow Meter signal > 590 kg/hr (equivalent)

In this mode the ECU now ignores the AFM signal and uses a set of replacement values based on engine RPM and Throttle Valve Position Sensor signal. This will cause a noticeable drop in performance with the engine feeling more 'hesitant'.

Check wiring loom for short to ground and AFM connector for poor connection. May indicate failure of Mass Air Flow Meter.

ECU Terminals:
7, 30, 37

NOTES:
The V6 uses a Hot Film Type Mass Air Flow Meter - utilises ceramic tile.
This is more reliable and causes less restriction than the 8v/16v hot wire type.
If AFM and TPS signals are both bad the ECU uses only two replacement values based solely on engine RPM.

• Engine under load and RPM < 2000   -   3.0 ms is used
• Engine under load and RPM > 2000   -   4.5 ms is used

TEST:
Disconnect plug to mass air flow sensor
Engine running at idle speed & engine run up to normal operating temperature.
All electrical consumers turned off (stereo, fan, heater etc).
Accelerator pedal not actuated (foot off accelerator).
Measure reading between pin 3 (+) inside the mass air flow sensor plug (loom side) and vehicle ground (-). Normal feed value > 11 v DC
Power to pin 3 is routed through the Fuel Pump Relay.

Also possible to intercept return signal to ECU using piercing probes between pins 2 (-) and 4 (+) on the Mass Air Flow Meter. Normal idle value is between 0.56 and 0.86 volts DC.
This equates to 8 - 18 kg/hr air mass flow.
Snap accelerate should see the voltage rise > 3 v

 

Fault is stored if:

• Time period > 30 ms
• OR
• Load Reduction Ignition Retard signal has been triggered three times for longer than 2.5 s

EFFECT:
In this fault mode the ECU will not adjust ignition timing when shifting gear

ECU Terminals:
19, 51

Fault is stored if:

• "Torque control/ignition retard" signal is active 3 times for longer than 2.6 s
  (Engagement time too long)

EFFECT:
No further ignition retard during shifting on Automatic Gearbox.

ECU Terminals:
19, 51

 

 

Fault is stored if:

• Ignition/Injection cut off signal from Traction Control ECU is present for longer than 0.2 seconds
• Full load prohibition signal from Traction Control ECU is not once recognised during the expected time period
• OR
• Ignition/Injection cut off signal from Traction Control ECU has a short circuit to battery voltage (+)

NOTE
After each engine start the ECU monitors the signals on terminal 38 (Full load prohibition signal) and terminal 50 (injection/ignition cut off signal). The Traction Control ECU sends test signals to these Motronic main ECU inputs as part of its start up checks. If the Motronic ECU receives both OR neither of these two test signals then this is considered normal and evaluated as "Traction Control ECU OK - pass start up test".
If only one of the two test signals are recognised then the Engine Management fault light is illuminated.

If the ECU is in fault mode (EM light on) because of an fault code 79, then the full load inhibit signal is ignored completely.

ECU Terminals:
38, 50

Fault is stored if:

• Final stage diagnosis in ECU fails (Short circuit to ground or circuit interruption)

EFFECTS:
The defective injector is no longer actuated by the Motronic ECU. The other injectors function normally.

ECU Terminals:
injector1 : 17, 14
injector2 : 16, 14
injector3 : 35, 14
injector4 : 34, 14
injector5 : 15, 14
injector6 : 33, 14

NOTES:
Expected pulsed signals to injectors (can be measured with a scope):
 timed pulse to injectors in milliseconds:
 cold cranking = 11 to 12 ms
 hot cranking = 3.1 + ms
 cold idle = 4.5 + ms
 hot idle = 3.1 to 3.3 ms

Fault is stored if:

• Final stage diagnosis in control unit fails
  (Short circuit to ground - circuit interruption)

ECU Terminals:
25, 19

NOTES:
Check Air Con compressor relay (K60)

Fault is stored if:

• Final stage diagnosis in control unit fails
  (Short circuit to voltage)

ECU Terminals:
25, 19

NOTES:
Check Air Con compressor relay (K60)

Fault is stored if:

• Recognition of more than one phase information during one work cycle with correct reference mark on cam (Short circuit to ground)
• Above condition must be fulfilled for at least 40 times.

EFFECTS:
Engine load signal is greater than 3 ms and coolant temperature is greater than 38 °C (100 °F):
The control unit retards the spark timing by up to 10.5 °CA for reasons of safety.
(Value varies depending on the engine speed)

The "Hall Sensor" on the camshaft is used for cylinder recognition. It informs the Motronic ECU of the camshaft position when cylinder 1 ignites. The ECU needs this information for accurate fuel injection control and for adaptive knock control. If the Hall sensor malfunctions the ECU attempts to use a random time for injector/spark actuation. This can cause a poor or non-starting engine.  If the engine does start with a malfunctioning cam sensor then expect very poor economy.

ECU Terminals:
8, 19, 37

TEST:
with engine running 2.5v DC (average)

 

Fault is stored if:

• Recognition of more than one phase information during one work cycle with correct reference mark on cam (Short circuit to ground)
• Above condition must be fulfilled for at least 40 times.

EFFECTS:
Engine load signal is greater than 3 ms and coolant temperature is greater than 38 °C (100 °F):
The control unit retards the spark timing by up to 10.5 °CA for reasons of safety.
(Value varies depending on the engine speed)

The "Hall Sensor" on the camshaft is used for cylinder recognition. It informs the Motronic ECU of the camshaft position when cylinder 1 ignites. The ECU needs this information for accurate fuel injection control and for adaptive knock control. If the Hall sensor malfunctions the ECU attempts to use a random time for injector/spark actuation. This can cause a poor or non-starting engine. If the engine does start with a malfunctioning cam sensor then expect very poor economy.

ECU Terminals:
8, 19, 37

TEST:
with engine running 2.5v DC (average)

 

Fault is stored if:
Ignition/Injection cut-off signal from Traction Control ECU is present for > 2.5 seconds.

EFFECTS:
If this fault is recognised then full load inhibit signal is ignored completely by the ECU until fault condition has cleared.

NOTES:
After each engine start the ECU monitors the signals on terminal 38 (Full load prohibition signal) and terminal 50 (injection/ignition cut off signal). The Traction Control ECU sends test signals to these Motronic main ECU inputs as part of its start up checks. If the Motronic ECU receives both OR neither of these two test signals then this is considered normal and evaluated as "Traction Control ECU OK - pass start up test".
If only one of the two test signals are recognised then the Engine Management fault light is illuminated.

ECU Terminals:
38, 50

Fault is stored if:

• Engine management light flashes and car won't start - Wrong coding - Immobiliser function has been coded incorrectly.
• Engine management light flashes and car will start - No coding. i.e. the immobiliser function has been disabled using a Tech1 or it's a new ECU which is always delivered with the immobiliser function off.

ECU Terminals:
9 - ECU immobiliser function uses vehicle speed sensor signal wire (which is routed through the immobiliser control unit) to request confirmation from the immobiliser control unit.

Notes:
A new request is only sent on ignition on if the prior ignition off period is greater than 12 seconds (amount of time taken for Motronic to power down fully after ignition off)

Engine management light flashes and car won't start (will start if immobiliser ECU function block disabled/reprogrammed with Tech1 or correct immobiliser received)

Fault is stored if:
Either the ECU does not recognise the signal format being sent from the immobiliser
OR
There is no signal coming from the immobiliser

NOTES:
If the car will not start check that you are not using the spare key with no transponder chip in the fob.
Check wiring between immobiliser unit and ECU. Check operation of Vehicle Speed Sensor wiring. Is the speedo working (late model V6's with electronic speedo)?

 

Engine management light flashes and car may not start or will start but faulty speedo.

Fault is stored if:
The immobiliser signal sent to the ECU is the correct format but it's the wrong transponder coding. Intermittent faulty wiring/connectors on speedo circuit.

NOTES:
If the car will not start check that the transponder chip is in the fob and intact. Check immobiliser transducer pick up unit (plastic ring unit around ignition barrel).
Check wiring between immobiliser unit and ECU. Check operation of Vehicle Speed Sensor wiring. Is the speedo working (late model V6's with electronic speedo)?