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Home >> Volvo >> 2012 >> C30 R Design L5-2.5L Turbo VIN 67 B5254T7 >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> Manufacturer Code Charts >> ECM Codes (Engine Control Module) >> ECM-929D >> Signal Too High / Signal Too Low

Signal Too High / Signal Too Low






Signal too high / Signal too low

Fault-tracing information




Fault-tracing information

Fault-tracing information

Caution! The male and female pins on the electronic throttle unit connectors are gold plated. Great care must be taken when measuring. Damage to the gold plating can result in operating difficulties.






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Continue - Checking the fault status

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Checking the fault status




- Start the engine.
Read off the diagnostic status and fault status for the diagnostic trouble code (DTC) by selecting the relevant diagnostic trouble code (DTC) from the list.
Check whether the fault is permanent or intermittent. Read off the diagnostic trouble code (DTC) fault status when the diagnostic status is "Completed".

Hint: In some cases several functions of the component will be diagnosed. The affects the amount of time taken to run the diagnostic.

The fault is permanent if the fault status is "Fault found". If the fault status is "No fault found" the fault is intermittent and not presently active.





Continue - Checking components and wiring

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Checking components and wiring




- Ignition off
- Check the throttle unit and engine control module (ECM) connectors. Check for contact resistance and oxidation.
Check the resistance value of the damper motor winding in the throttle unit. Take readings between throttle unit terminals #1 and #4 (component side). Check for an open-circuit. Check for a short-circuit.

Note! The resistance of the motor winding in the damper motor is very low.

Check the damper motor (+) and (-) cable. Check for an open-circuit. Check for a short-circuit to ground. Check for a short-circuit to supply voltage.
Check between:
- Engine control module (ECM) terminal #A74 (#B14) and throttle unit terminal #4 (cable harness side)
- Engine control module (ECM) terminal #A75 (#B15) and throttle unit terminal #1 (cable harness side).
Also check the damper motor cables (+) and (-). Check for a short-circuit to each other.
Check that the shutter in the throttle unit is not blocked or sticking. Clean as necessary.
Remedy as necessary.

Other information:
- Connecting the breakout box, B5254T7 Connecting the Breakout Box, Engine Control Module (ECM)
- Signal specification, B5254T7 Signal Specification
- Component specifications, B5254T7 [1][2]Engine Control Module
- Throttle body, cleaning, B5254T7 Procedures
- Throttle body, B5254T7 Removal and Replacement
- Engine control module (ECM), B5254T7 Service and Repair
- Checking wiring and terminals Checking Wiring and Terminals









Continue - Adaptation of the throttle unit

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Adaptation of the throttle unit

Note! The ignition must be switched on for at least 30 seconds after the basic conditions are met in order for the adaptation to start. It takes approximately 10 seconds to run the adaptation.








- Ignition off
- Reinstall the connectors, components etc.
- Ignition on.
Read off parameters.
Check that the following basic conditions for adaptation of the throttle unit are met.
1. Ignition on / engine off
2. Battery voltage above 10 V
3. Accelerator pedal (AP) unaffected
4. The car must be stationary (no vehicle speed signal)
5. Engine coolant temperature (ECT) between 5-100 °C
6. Intake air temperature (IAT) above 5 °C.
Remedy as necessary.
Check that the adaptation is correctly run after the "Adaptation of the throttle unit running" parameter changes status from "YES" to "NO". When all basic conditions are met, the adaptation must be completed after approximately 40 seconds. When the adaptation is completed correctly, the following information will be displayed:
- Adaptation of the throttle unit: OK
- Adaptation of the throttle unit running: NO.









Then select Continue when the adaptation has been completed correctly.

Continue - Verification

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Verification

Hint: After carrying out the repair, check that the fault has been remedied.








- Ignition off
- Reconnect the connectors, reinstall components etc.
- Start the engine.
Read off the diagnostic status and fault status for the diagnostic trouble code (DTC) by selecting the relevant diagnostic trouble code (DTC) from the list.
Check the fault status for the diagnostic trouble code (DTC) when the diagnostic is "Complete". If the function is correct, the fault status must be "No fault found" when the diagnostic is complete.





Is the function OK?

Yes - FAULT FOUND

No - Programming the engine control module (ECM)

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Programming the engine control module (ECM)

Hint: This diagnostic trouble code (DTC) may be caused by faulty software.




- Ignition off.
Try downloading new software to the engine control module (ECM). To download new software, see: Engine control module (ECM), B5254T7 Service and Repair
Remedy as necessary.

Continue - Adaptation of the throttle unit

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Adaptation of the throttle unit

Note! The ignition must be switched on for at least 30 seconds after the basic conditions are met in order for the adaptation to start. It takes approximately 10 seconds to run the adaptation.








- Ignition off
- Reinstall the connectors, components etc.
- Ignition on
- Read off parameters.
Check that the following basic conditions for adaptation of the throttle unit are met.
1. Ignition on / engine off
2. Battery voltage above 10 V
3. Accelerator pedal (AP) unaffected
4. The car must be stationary (no vehicle speed signal)
5. Engine coolant temperature (ECT) between 5-100 °C
6. Intake air temperature (IAT) above 5 °C.
Remedy as necessary.
Check that the adaptation is correctly run after the "Adaptation of the throttle unit running" parameter changes status from "YES" to "NO". When all basic conditions are met, the adaptation must be completed after approximately 40 seconds. When the adaptation is completed correctly, the following information will be displayed:
- Adaptation of the throttle unit: OK
- Adaptation of the throttle unit running: NO.









Then select Continue when the adaptation has been completed correctly.

Continue - Verification

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Verification




Verification

Hint: After carrying out the repair, check that the fault has been remedied.








- Ignition off
- Reconnect the connectors, reinstall components etc.
- Start the engine.
Read off the diagnostic status and fault status for the diagnostic trouble code (DTC) by selecting the relevant diagnostic trouble code (DTC) from the list.
Check the fault status for the diagnostic trouble code (DTC) when the diagnostic is "Complete". If the function is correct, the fault status must be "No fault found" when the diagnostic is complete.





Is the function OK?

Yes - VERIFIED

No - VERIFICATION FAILED

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VERIFIED - FAULT FOUND

VERIFICATION FAILED - Fault-tracing information

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Fault-tracing information




Information

Fault-tracing information
The fault should have been detected and remedied. As this is not the case fault-tracing has failed.
Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.

Do you want to exit fault-tracing?

Yes - Exit fault-tracing

No - Attempt New Test

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Attempt New Test - Fault-tracing information

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