Permanent Fault, Signal Missing

Permanent fault, signal missing

Checking connectors








Check engine speed (RPM) sensor and engine control module (ECM) connectors for contact resistance and oxidation and remedy according to Checking wiring and terminals. Permanent fault Checking Wiring And Terminals. Permanent Fault.
Check for damaged or loose pins.
Reconnect connectors
Start engine.
Read off the diagnostic trouble code (DTC) status.





Is the status intermittent?

Yes - Verification

No - Checking cables and components

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Checking cables and components
Check engine speed (RPM) sensor resistance which should be between 250-350 ohms.
Check signal cables between engine control module (ECM) terminals 24 and 54 and engine speed (RPM) sensor terminals 1 and 2 for a short-circuit to ground and voltage, short-circuit to and open-circuit and remedy according to Checking wiring and terminals. Permanent fault Checking Wiring And Terminals. Permanent Fault.

Hint: With the ignition on the voltage between the engine speed (RPM) sensor connector terminals 1 and 2 and the ground terminal should be approximately 1.8 V.

Other information
- To connect the test box, see Connecting the breakout box. EMS 2000 Connecting The Breakout Box. EMS 2000.













Was a fault found in the above fault-tracing?

Yes - Verification

No - Defective engine speed (RPM) sensor

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Defective engine speed (RPM) sensor
Try a new engine speed (RPM) sensor according to Replacing the engine speed (RPM) sensor Service and Repair.

Continue - Verification

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Verification




Start engine.
Read off the diagnostic trouble code (DTC) status.





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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Attempt New Test - Checking connectors

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