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DTC P1492: Ambient/Batt Temp Sen Volts Too High: Testing

  1. Turn ignition on. Using scan tool, read ambient temperature sensor voltage. If voltage is more than 4.8 volts, go to next step. If voltage is 4.8 volts or less, go to step  7 .
  2. Turn ignition off. Disconnect ambient temperature sensor harness connector. See Figure . Turn ignition on. Measure voltage between ground and signal circuit (Violet/Light Green wire) at ambient temperature sensor harness connector. If voltage is 5.2 volts or less, go to next step. If voltage is more than 5.2 volts, repair short to voltage in Violet/Light Green wire.
  3. Turn ignition off. Connect a jumper wire between ambient temperature sensor harness connector terminals. Turn ignition on. Using scan tool, read ambient temperature sensor voltage. If voltage is one volt or more, go to next step. If voltage is less than one volt, replace ambient temperature sensor.
  4. Turn ignition off. Remove jumper wire. Disconnect PCM harness connectors. See Figure . Measure resistance of signal circuit (Violet/Light Green wire) between ambient temperature sensor harness connector and terminal No. 52 at PCM C2 harness connector. See Figure . If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Violet/Light Green wire.
  5. Measure resistance of sensor ground circuit (Black/Light Blue wire) between ambient temperature sensor harness connector and terminal No. 43 at PCM C2 harness connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Black/Light Blue wire.
  6. If no other possible causes are remaining, replace PCM.
  7. Conditions that set DTC are not present at this time. Perform the following to help identify intermittent condition:
    • With engine running at normal operating temperature, wiggle related wiring harness while monitoring related parameters on scan tool. If voltage changes or DTC sets while wiggling wiring harness, repair connectors or wiring harness where wiggling caused voltage to change or DTC to set.
    • Review freeze frame information on scan tool. Duplicate conditions present when DTC was set.
    • Refer to any technical service bulletins that may apply.
    • Visually inspect related wiring harness. Check for chafed, pierced, pinched or partially broken wires.
    • Visually inspect related wiring harness connectors. Check for broken, bent, pushed out or corroded terminals.

    If a problem is found, repair as necessary. If no problems are found, test is complete.

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