Signal Too Low

Signal too low

Checking the component and wiring
- Check the condition of the battery and the function of the charging system.
Check the voltage feed to the Engine control module (ECM). Check between Engine control module (ECM) #B16 (#C16) and the battery's plus terminal for contact resistance or oxidation in connections.
Check the voltage feed to the start relay.
Check between the start relay and the battery's plus terminal for contact resistance or oxidation in connections.
Check the power supply to the starter motor.
Check between the starter motor and the battery's plus terminal for contact resistance or oxidation in connections.
Check between the starter motor and start relay for contact resistance or oxidation in connections.
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
- For further information about the fuses and relays, see the Wiring Diagram.
- 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
- Reconnect the connectors, reinstall components etc.
- Start the engine. The fault has not been remedied if the engine does not start.
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.
Increase the engine speed to 2500 rpm until the diagnostic is "Complete".
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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VERIFICATION FAILED - Fault-tracing information

VERIFIED - FAULT FOUND

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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 component and wiring

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