Signal Too Low

Signal too low

Checking the status




- Start the engine.
- Ignition off
- Ignition on.
Read off the movement of the accelerator pedal by carefully depressing and releasing the accelerator pedal (AP).
Check that the value changes with accelerator pedal movement. The value must be between 5 % (released pedal) and a maximum of 90 % (fully depressed pedal). The function is OK if the value is within this range and follows the pedal movement.
The fault is intermittent at the moment if the values are OK.





Continue - Checking the power supply

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Checking the power supply




- Ignition on.
Check the power supply (12 V) to the accelerator pedal (AP) position sensor between accelerator pedal (AP) position sensor terminals #4 (cable harness side) and #6 (cable harness side).
Check that the power supply is approximately 12 V with the ignition on.

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













Is the power supply OK?

Yes - Checking the connectors and cables

No - Checking the component and wiring

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Checking the connectors and cables




- Ignition off
- Check the accelerator pedal position sensor and engine control module (ECM) connectors. Check for contact resistance. Check for oxidation.
Check the signal cable between engine control module (ECM) terminal #B26 (#C26) and accelerator pedal (AP) position sensor terminal #5 (cable harness side). Check for an open-circuit. Check for a short-circuit to ground.
Try a new accelerator pedal (AP) position sensor if no fault is found and the fault is permanent.
Remedy as necessary.

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













Continue - Verification

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Checking the component and wiring




- Ignition off
- Check the accelerator pedal (AP) position sensor connector. Check for contact resistance and oxidation.
Check the power supply cable (12 V) between accelerator pedal (AP) position sensor terminal #6 (cable harness side) and the relevant fuse for the circuit. Check for a short-circuit to ground. Check for an open-circuit. Check that the fuse for the circuit has not blown.
Check the ground lead for power supply (12 V) between accelerator pedal (AP) position sensor terminal #4 (cable harness side) and the relevant ground terminal. Check for contact resistance and oxidation. Check for an open-circuit.

Hint: With the ignition on, the power supply to the accelerator pedal (AP) position sensor measured between accelerator pedal (AP) position sensor terminals #4 (cable harness side) and #6 (cable harness side) must be approximately 12 V.

Remedy as necessary.

Other information
- Connecting the breakout box, B5254T7 Connecting the Breakout Box, Engine Control Module (ECM)
- Signal specification, B5254T7 Signal Specification
- For further information about the fuses and relays, see the Wiring Diagram.
- Accelerator pedal Removal and Replacement
- Checking wiring and terminals Checking Wiring and Terminals













Continue - Checking the connectors and cables

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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.
- Ignition off
- Ignition on.
Read off the movement of the accelerator pedal by carefully depressing and releasing the accelerator pedal (AP).
Check that the value changes with accelerator pedal movement. The value must be between 5 % (released pedal) and a maximum of 90 % (fully depressed pedal). The function is OK if the value is within this range and follows the pedal movement.
The fault has been remedied if the values are OK.





Are these values 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 - Checking the status

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