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DTC P1495: Leak Detection Pump Solenoid Circuit: Testing

  1. Turn the ignition on. With the DRBIII(R), read DTCs. Is the Good Trip counter displayed and equal to zero? If yes, go to next step. If no, go to step  7 .
  2. Turn the ignition off. Disconnect the LDP harness connector. Using a 12-volt test light, connect one end to the fused ignition switch output circuit and the other end to the LDP solenoid control circuit in the LDP harness connector. Turn the ignition on. With the DRBIII(R), actuate the LDP. Does the test light flash on and off? If yes, replace the LDP. If no, go to next step.
  3. Using a 12-volt test light connected to ground, probe the ignition switch output circuit in the LDP harness connector. Does the test light illuminate brightly? If yes, go to next step. If no, repair the fused ignition switch output circuit as necessary.
  4. Turn the ignition off. Disconnect the PCM harness connectors. Measure the resistance between ground and the LDP solenoid control circuit in the LDP harness connector. Is the resistance less than 5.0 ohms? If yes, repair the LDP solenoid control circuit for a short to ground. If no, go to next step.
  5. Measure the resistance of the LDP solenoid control circuit between the LDP solenoid harness connector and the PCM harness connector. Is the resistance less than 5.0 ohms? If yes, go to next step. If no, repair the LDP solenoid control circuit for an open.
  6. There are no possible causes remaining, replace PCM.
    7. WARNING: When the engine is operating, DO NOT stand in a direct line with the fan. DO NOT put your hands near the pulleys, belts or fan. DO NOT wear loose clothing.
    NOTE: Use the Freeze Frame Data to help duplicate the conditions that set the DTC. Pay particular attention to the DTC set conditions, such as, VSS, MAP, ECT, and Load.
  7. Conditions that set DTC are not present at this time. The following list may help in identifying the 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.
    • 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.
    • Refer to any Technical Service Bulletin (TSB) that may apply.
    • Perform a wiggle test of the LDP wiring while the circuit is actuated with the DRBIII(R). Listen for the LDP to quit actuating. Also watch for the Good Trip counter to change to zero.

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

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