Faulty Signal. Permanent Fault

Faulty signal. Permanent fault

Checking the connectors








Check the engine speed (RPM) sensor and engine control module (ECM) connectors for contact resistance and oxidation according to Checking wiring and terminals. Permanent fault Checking Wiring and Terminals. Permanent Fault. Remedy if necessary.
Check in particular for damage or loose terminal pins.
Reconnect the connectors.
Start the engine. Allow the engine to run at idle speed for 30 seconds.
Ignition off for 30 seconds. NOTE! If the engine cooling fan (FC) is running, the ignition must be off for 30 seconds after the engine cooling fan (FC) has stopped.
Start the engine. Allow the engine to run at idle speed for 30 seconds.
Read off diagnostic trouble codes (DTCs). The fault has been remedied if the status of the diagnostic trouble code (DTC) has changed to intermittent.





Is the status intermittent?

Yes - FAULT FOUND

No - Checking the wiring and components

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Checking the wiring and components
Check the resistance of the engine speed (RPM) sensor. The resistance must be between 250-350 ohms at 25°C.
Remove the engine speed (RPM) sensor. Check that there is no dirt on the engine speed (RPM) sensor or flywheel. Check that there is no damage on the flywheel which could affect the signal.
Try a new engine speed (RPM) sensor if no fault is found during the above fault-tracing.
Remedy as necessary.

Other information
- To connect the breakout box, see Connecting the breakout box. EMS 2000 Connecting The Breakout Box. EMS 2000
- To remove or replace the engine speed (RPM) sensor, see Replacing engine speed (RPM) sensor Service and Repair.













Continue - Verification

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Verification




- Start the engine. Allow the engine to run at idle speed for 30 seconds
Ignition off for 30 seconds. NOTE! If the engine cooling fan (FC) is running, the ignition must be off for 30 seconds after the engine cooling fan (FC) has stopped.
Start the engine. Allow the engine to run at idle speed for 30 seconds.
Read off diagnostic trouble codes (DTCs). The fault has been remedied if the status of the diagnostic trouble code (DTC) has changed to intermittent.





Is the status intermittent?

Yes - FAULT FOUND

No - No Fault Found Fault-tracing information

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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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FAULT-TRACING FAILED - No Fault Found

Attempt New Test - Checking the connectors

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