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I got the code - now what? 900 1992

posted by  daidnik on  Sat Jun 7 07:14 CST 2008
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last visit: Thu Jan 20 22:02 CST 2011
[RELATED]

From the Volvo manual:

"If the ECM does not receive a signal from the RPM sensor for 40 crankshaft revolutions (estimated by the ECM from the CMP sensor signal), the ECM sets it as a fault 1-3-1."

Fault sources:

Signal lead shorted to Gnd.

Signal lead shorted to Hot.

Signal lead broken

Contact resistance in terminals

RPM sensor defect


The sensor is the Crankshaft Position Sensor mounted in back of the motor above the top of the flywheel.

If the engine doesn't start, fault is permanent and troubleshooting should start with measuring the resistance between the terminals of the sensor. Resistance should be between 240 & 400 Ohms. If this doesn't check okay, then sensor or leads to it are bad & sensor needs to be replaced.

If the resistance checks okay, then you start testing for the shorted to hot or grnd cases.






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