Faulty Signal

Faulty signal

Diagnostic trouble code (DTC) status ECM-3100 Engine speed (RPM) sensor. Signal missing

Note! When reading off the diagnostic trouble code (DTC) status, other stored diagnostic trouble codes (DTCs) and their status will also be listed.

Read off the diagnostic trouble code (DTC) status. Check the status of the relevant diagnostic trouble code (DTC).





Was the status of the relevant diagnostic trouble code (DTC) permanent?

Yes - Checking the wiring and component

No - Intermittent fault

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Checking the wiring and component
Check the engine speed (RPM) sensor connector. Check for contact resistance and oxidation.
Check the resistance of the engine speed (RPM) sensor between terminals 1 and 2 in the engine speed (RPM) sensor connector.
For the resistance values, see Impulse sensor Impulse Sensor.
Check the cable between the engine speed (RPM) sensor terminal 1 and control module terminal #A48. Check for an open-circuit. Check for a short-circuit to supply voltage. Check for a short-circuit to ground.
Check the cable between the engine speed (RPM) sensor terminal 2 and control module terminal #A66. Check for an open-circuit. Check for a short-circuit to supply voltage. Check for a short-circuit to ground.
Remedy as necessary.

Other information
- To localize the engine speed (RPM) sensor, see Location of components Locations
- To connect the breakout box, see Connecting the breakout box Connecting the Breakout Box
- To access the control module, see
- For information about signals, see Signal specification Signal Description / Specification
- Checking wiring and terminals Checking Wiring And Terminals.









Was a fault found in the wiring or connector?

Yes - Verification

No - Replacing the component

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Replacing the component




Try a new engine speed (RPM) sensor. Localize it using Location of components Locations.


Continue - Verification

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Intermittent fault





Faulty signal. Intermittent fault

Faulty signal. Intermittent fault
Control module previously registered a fault. The fault is now no longer present.


Continue - DONE

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DONE - DONE

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Verification




Verification

Verification

Hint: After carrying out the repair, check that the fault has been remedied. This is done by checking the diagnostic trouble code (DTC) status. If it is intermittent the fault has been remedied.








- Ignition off.
- Reconnect connectors, reinstall components
- Start the engine.
- Read off the Diagnostic trouble code (DTC) status. Check the status of the relevant Diagnostic Trouble Code (DTC).





Was the status of the relevant Diagnostic Trouble Code (DTC) displayed as intermittent?

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 - Diagnostic trouble code (DTC) status ECM-3100 Engine speed (RPM) sensor. Signal missing

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