Faulty Signal

Faulty signal

Checking components
Check that the engine speed (RPM) sensor is correctly installed.
Check the engine speed (RPM) sensor connector. Check for intermittent contact resistance and oxidation.
The engine speed (RPM) sensor is sensitive to interference from surrounding power cables, the starter motor cable for example, or similar high amperage cables. This occurs when starting the engine for example.
Interference can cause difficulty in starting the engine, the engine does not start at all, the tachometer flickers at start attempts etc.
Causes of interference can be:
- surrounding power cables, for example an incorrectly routed starter motor cable
- incorrectly routed transmission bolted joints for the engine.

Checking the power cable
Check for incorrectly routed power cables (routed too close to the engine speed (RPM) sensor).

Checking the bolted joints
When removing and installing the transmission it is important that all the bolts for the engine are correctly tightened. Incorrectly tightened bolts can cause poor ground connection and interfere with the engine speed (RPM) sensor. Check that all the bolts from the transmission to the engine are correctly tightened.

Checking the wiring
Check the signal cable between the engine speed (RPM) sensor terminal #1 and engine control module (ECM) terminal #A48 (#A48) and between the engine speed (RPM) sensor terminal #2 and engine control module (ECM) terminal #A66 (#B6). Check for an intermittent short-circuit to supply voltage. Check for an intermittent short-circuit to ground. Check for an intermittent open-circuit.

Other information:
- Checking wiring and terminals Checking Wiring And Terminals
- To access or replace the engine speed (RPM) sensor, see Engine speed (RPM) sensor, replacing Service and Repair.
Remedy as necessary













Continue - Verification

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Verification




Verification

Verification

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




- Start the engine. Allow the engine to idle. There is a fault if the engine does not start
- Read off the diagnostic status and the fault status for diagnostic trouble code (DTC) ECM-5200.
Check that the fault status is "NO FAULT FOUND" when the diagnostic status is COMPLETED. If the fault status is "FAULT FOUND" when the diagnostic status is COMPLETED there is a fault.





Does the engine start and is the fault status "NO FAULT FOUND"?

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 - FAULT-TRACING FAILED

No - Attempt New Test

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FAULT-TRACING FAILED - FAULT-TRACING FAILED

Attempt New Test - Checking components

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