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  • DTC 42 - No Auto Shutdown Relay Voltage Sense At PCM

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    DTC 42 - No Auto Shutdown Relay Voltage Sense At PCM - Test FC-13A

    1. If AUTO SHUTDOWN RELAY CONTROL CIRCUIT fault is also present, perform TEST FC-12A. If AUTO SHUTDOWN RELAY CONTROL CIRCUIT fault is not present, erase fault codes using DRB-II. Start engine. Read fault codes. If NO ASD RELAY VOLT SENSE AT PCM fault did not return, conditions required to set fault are not present at this time. Perform TEST VER-1. If NO ASD RELAY VOLT SENSE AT PCM fault returned, erase fault codes. Replace ASD relay with a known good relay.
    2. Start engine and read fault codes. If NO ASD RELAY VOLT SENSE AT PCM did not return, replace original ASD relay. Perform TEST VER-1. If NO ASD RELAY VOLT SENSE AT PCM fault returned, turn ignition off. Disconnect ASD relay. Using DRB-II in voltmeter mode, probe ASD relay connector terminal "B", battery voltage circuit (Red wire).
    3. If reading is 12 volts or less, repair Red wire. Perform TEST VER-1. If reading is more than 12 volts, turn ignition off. Disconnect PCM. Using an external ohmmeter, measure resistance of ASD relay output circuit (Dark Green/Orange wire) between PCM connector terminal No. 57 and ASD relay connector terminal "D". If resistance is less than 5 ohms, replace PCM. Perform TEST VER-1. If resistance is 5 ohms or more, repair open Dark Green/Orange wire. Perform TEST VER-1.

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