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  • P0320 No Crank Reference Signal At PCM

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    Mopar1973Man

    DTC P0320: NO CRANK REFERENCE SIGNAL AT PCM

    1. Start engine and allow engine to idle. Using scan tool, read engine speed at PCM. Compare engine speed displayed on scan tool with engine speed on tachometer. If engine speed on scan tool is not within 100 RPM of engine speed on tachometer, go to next step. If engine speed on scan tool is within 100 RPM of engine speed on tachometer, DTC is inactive at this time. Shut engine off. Inspect ECM and PCM for damaged pins or terminals. ECM is located on driver's side of engine, just in front of fuel transfer pump and contains a 50-pin connector. PCM is located at passenger's side rear corner of engine compartment. Repair or replace components as necessary. Perform TEST VER-5A .

    2. Shut engine off. Ensure ignition is off. Using voltmeter, backprobe terminal No. 8 (Gray/Black wire) on PCM connector C1. This is the crankshaft position (CKP) sensor signal circuit at PCM. Turn ignition on with engine off and note voltage reading. If voltage is more than 4.75 volts, leave voltmeter connected and go to next step. If voltage is 4.75 volts or less, go to step 6 .

    3. Turn ignition off. Ensure voltmeter is still backprobing terminal No. 8 (Gray/Black wire) on PCM connector C1. Start engine and allow engine to idle. Note voltage reading with engine idling. If voltage is not 2-3 volts, leave voltmeter connected and go to next step. If voltage is 2-3 volts, replace PCM. Perform TEST VER-5A .

    4. Shut engine off. Ensure ignition is off. Ensure voltmeter is still backprobing terminal No. 8 (Gray/Black wire) on PCM connector C1. Turn ignition on with engine off and note voltage reading. If voltage is 6 volts or less, go to next step. If voltage is more than 6 volts, repair short to voltage on Gray/Black wire between terminal No. 45 (Gray/Black wire) on ECM connector and terminal No. 8 (Gray/Black wire) on PCM connector C1. Perform TEST VER-5A .

    5. Turn ignition off. Disconnect ECM and PCM connectors. Using ohmmeter, check resistance between terminal No. 45 (Gray/Black wire) on ECM connector and terminal No. 8 (Gray/Black wire) on PCM connector C1. If resistance is less than 5 ohms, replace ECM. Perform TEST VER-5A . If resistance is 5 ohms or more, repair open on Gray/Black wire between ECM and PCM. Perform TEST VER-5A .

    6. Turn ignition off. Disconnect ECM and PCM connectors. Using ohmmeter, check resistance between ground and terminal No. 45 (Gray/Black wire) on ECM connector. If resistance is 5 ohms or more, replace ECM. Perform TEST VER-5A . If resistance is less than 5 ohms, repair short to ground on Gray/Black wire between ECM and PCM. Perform TEST VER-5A .



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