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  • DTC 11 - No Crank reference Signal At PCM

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    Mopar1973Man

    DTC 11 - No Crank reference Signal At PCM - Test FC-11A

    1. Using DRB-II, select SENSOR TESTS. Start engine. Using DRB-II, read engine RPM. If DRB-II does not show a RPM reading, go to step 3). If DRB-II shows a RPM reading, condition required to set fault is not present at this time. NO CRANK REFERENCE SIGNAL AT PCM fault sets if no signal is present during load conditions with vehicle speed more than 10 MPH. Possible causes are open or shorted 8-volt supply, open or shorted CKP signal circuit, open sensor ground, failed CKP sensor, and failed PCM.
    2. Inspect wiring and connectors. Repair harness or connector as necessary. Perform TEST VER-1. If no problems were found with wiring and connectors, wiggle harness between PCM and sensor while observing RPM reading on DRB-II. If RPM became erratic or stopped, repair harness or connector where problem occurred. Perform TEST VER-1. If RPM did not become erratic or stop, see INACTIVE FAULT CONDITION. Test is complete. Perform TEST VER-1.
    3. Turn ignition off. Disconnect crankshaft position sensor. Using DRB-II in ohmmeter mode, probe 8-volt power supply circuit (Tan/Yellow wire) in crankshaft position sensor harness connector. If resistance is less than 5 ohms, repair Tan/Yellow wire for a short to ground. Perform TEST VER-1. If resistance is 5 ohms or more, turn ignition on. Using DRB-II in voltmeter mode, probe 8-volt power supply circuit (Tan/Yellow wire) in crankshaft position sensor harness connector. If reading is 7 volts or less, go to TEST FC-11B.
    4. If reading is more than 7 volts, connect a jumper wire to crankshaft position sensor harness connector, signal circuit (Gray/Black wire). Using DRB-II, read RPM while tapping other end of jumper wire to sensor ground circuit (Black/Light Blue wire). If DRB-II shows an RPM reading, replace crankshaft position sensor. Perform TEST VER-1.
    5. If DRB-II does not show RPM reading, turn ignition off. Using DRB-II in ohmmeter mode, probe crankshaft position sensor, ground circuit (Black/Light Blue wire). If resistance is 5 ohms or more, repair Black/Light Blue wire for an open circuit to wiring harness splice. Perform TEST VER-1. If resistance is less than 5 ohms, disconnect PCM connector. Check connector, and repair as necessary. Perform TEST VER-1. If connector is okay, check resistance of crankshaft position sensor signal circuit (Gray/Black wire) using an external ohmmeter.
    6. If resistance is 5 ohms or more, repair Gray/Black wire for open circuit. Perform TEST VER-1. If resistance is less than 5 ohms, put DRB-II in ohmmeter mode. Probe crankshaft position sensor harness connector, signal circuit (Gray/Black wire). If resistance is 5 ohms or more, replace PCM. Perform TEST VER-1. If resistance is less than 5 ohms, repair Gray/Black wire for a short to ground. Perform TEST VER-1.

    Test FC-11B - No Crank reference Signal At PCM

    1. Turn ignition off. Disconnect Powertrain Control Module (PCM). Check PCM connector, and repair as necessary. Perform TEST VER-1. If connector is okay, check resistance of crankshaft position sensor harness connector 8-volt supply circuit (Tan/Yellow wire) using an external ohmmeter.
    2. If resistance is 5 ohms or more, repair Tan/Yellow wire for an open circuit. Perform TEST VER-1. If resistance is less than 5 ohms, replace PCM. Perform TEST VER-1.


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