Signal Too Low

Signal too low

Checking the status




- Ignition on.
Check whether the fault is permanent or intermittent. Read off the 5 volt power supply from the engine control module (ECM). The value must be higher than 4 volts and lower than 6 volts. The fault is permanent if the value is incorrect. The fault is intermittent if the value is correct.









Continue - Checking the components and wiring

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Checking the components and wiring

Note! If diagnostic trouble codes (DTCs) have been stored for a component that is supplied with 5 volt in the engine control module (ECM), these diagnostic trouble codes (DTCs) must be fault-traced first.

Check the power supply cables between engine control module (ECM) terminals #A13 (#A13), #A14 (#A14), #A15 (#A15), #A16 (#A16), A17 (#A17), #A39 (#A39) and #B31 (#C31), and components connected to these power supply cables. Check for a short-circuit to ground.
Remedy as necessary.

Hint: This diagnostic trouble code (DTC) can also be caused by an internal fault in the engine control module (ECM).

Other information
- Connecting the breakout box Connecting The Breakout Box, Engine Control Module (ECM)
- Signal specification Signal Specification, Engine Control Module (ECM)
- For information about components connected to the power supply cables, see the wiring diagram
- Engine control module (ECM) Service and Repair
- 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.
- Ignition on.
Read off the power supply 5 volt from the engine control module (ECM).
The value must be higher than 4 volts and lower than 6 volts.





Is the value correct?

Yes - VERIFIED

No - VERIFICATION FAILED

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VERIFICATION FAILED - Fault-tracing information

VERIFIED - FAULT FOUND

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Fault-tracing information

FAULT-TRACING FAILED - FAULT-TRACING FAILED

Attempt New Test - Checking the status

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