Signal Too Low

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 component and wiring

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Checking the component and wiring




- Ignition off.
Check the throttle unit and engine control module (ECM) connectors. Check for contact resistance and oxidation.
Check the resistance values of the potentiometers in the throttle unit.
Check the power supply cable (5V) between engine control module (ECM) terminal #A19 (#A19) and throttle unit terminal #3 (cable harness side). Check for an open-circuit. Check for a short-circuit to ground.

Hint: With the ignition on, the power supply to the throttle unit potentiometers must be approximately 5 V measured between throttle unit connector terminals #2 and #3 (cable harness side).

Check the signal cable (potentiometer 2) between engine control module (ECM) terminal #A88 (#B28) and throttle unit terminal #5 (cable harness side). Check for an open-circuit. Check for a short-circuit to ground.
If no faults are found during the checks and the diagnostic trouble code (DTC) recurs, try replacing the throttle unit.

Note! When replacing the throttle unit, the throttle unit must be adapted. See Throttle unit adaptation in the vehicle communication socket.

Remedy as necessary.

Other information
- Connecting the breakout box, B5254T7 Connecting the Breakout Box, Engine Control Module (ECM)
- Signal specification, B5254T7 Signal Specification
- Checking wiring and terminals Checking Wiring and Terminals













Continue - Verification

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Verification




Verification

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








- Ignition off
- Reinstall the connectors, components etc.
- Start the engine.
Read off diagnostic trouble codes (DTCs).
If the status of the diagnostic trouble code (DTC) is intermittent the fault has been remedied.





Is the status of the diagnostic trouble code (DTC) intermittent?

Yes - VERIFIED

No - VERIFICATION FAILED

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VERIFIED - FAULT FOUND

VERIFICATION FAILED - Fault-tracing information

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Fault-tracing information

Attempt New Test - Fault-tracing information

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