Faulty Signal

ECM-3100 ENGINE SPEED (RPM) SENSOR
FAULTY SIGNAL

Diagnostic trouble code (DTC) status ECM-3100 Engine Speed (RPM) Sensor. Faulty signal



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

Read 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 permanent?
Yes - Continue below.
No - Faulty Signal - Intermittent Fault


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, Engine Speed (RPM) 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, Locations
- To connect the breakout box, Connecting the Breakout Box (ECM)
- To access the control module, Engine Control Module (ECM), Replacing
- For information about signals, Pinout Values and Diagnostic Parameters
- Checking Wiring and Terminals

Was a fault found in the wiring or connector?
Yes - Skip to "Verification"
No - Continue below.


Replacing the component
Try a new engine speed (RPM) sensor. Localize it using Locations


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 - Testing Complete
No - Continue Below.


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.