Fault Isolation Procedure
- Checking sensor input:
- Turn the ignition switch to the OFF position.
- Unplug the connector: Crankshaft position sensor (345).
- Take a resistance reading between 345:1 and 345:2.
If the reading shows 150-250 ohms, go to step 3, otherwise go to next step.
- Rectifying the lead: One of the following leads is faulty. Either the lead from pin 1 of the female connector to pin 17 of the control module or the lead from pin 2 of the female connector to pin 18 of the control module. Rectify the fault and go to step 6.
- Checking The Wiring harness:
- Connect Test Lamp (86 1 857) to B+ and pin 3 of the female connector.
- Jiggle the leads and in-line connectors at several places and in different directions to reveal intermittent breaks and short circuits in the wiring harness. Observe the multimeter, test lamp or diagnostic tool while doing this.
If the test lamp illuminates, go to step 5, otherwise go to next step.
- Rectifying the lead: The lead from crimp connection J17 to pin 3 of the female connector is faulty. Rectify the fault and go to step 6.
- Changing components: Change crankshaft position sensor. When finished, go to next step.
- Final check:
- Clear the DTCs in all systems.
- Carry out a drive cycle: Drive the car at varying engine loads and engine RPM for 5 minutes.
- Evaluate the drive cycle: Check that the DTC has not recurred.
If the trouble code has recurred, the ECM is probably at fault and will need replacement. Replace with known-good ECM and retest. if no DTCs are present, then the steps taken to rectify the fault were correct.
Courtesy of SAAB-SCANIA OF AMERICA, INC.
Courtesy of SAAB-SCANIA OF AMERICA, INC.