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DTC P1495: Leak Detection Pump Solenoid Circuit: Testing

  1. Turn ignition on, engine not running. With the DRBIII®, read DTCs. Is the DTC Good Trip counter displayed and equal to zero? If yes, go to next step. If no, go to step  8.
  2. Turn the ignition off. Disconnect the Leak Detection Pump electrical harness connector. Turn ignition on, engine not running. With the DRBIII®, actuate the Leak Detection Pump. Using a 12-volt test light connected to ground, check the Generator Source Circuit at the LDP connector. Does the test light illuminate brightly? If yes, go to next step. If no, repair the Generator Source Circuit for an open.
  3. Turn the ignition off. Connect a 12-volt test light to a good 12-volt source. Turn ignition on, engine not running. With the DRBIII®, actuate the Leak Detection Pump. Check the LDP Solenoid Control circuit at the Leak Detection Pump harness connector with the test light while the Leak Detection Pump is actuating. Does the test light blink? If yes, go to next step. If no, go to step  5.
  4. There are no possible causes remaining, replace the Leak Detection Pump.
  5. Turn the ignition off. Disconnect the PCM harness connectors. Check connectors and clean/repair as necessary. Measure the resistance of the (K106) LDP Solenoid Control Circuit from the PCM harness connector to the LDP harness connector. Is the resistance below 5.0 ohms? If yes, go to next step. If no, repair the Leak Detection Pump Solenoid Control Circuit for an open.
  6. Measure the resistance between ground and the (K106) LDP Solenoid Control circuit at the Leak Detection Pump harness connector. Is the resistance below 100 ohms? If yes, repair the LDP Solenoid Control Circuit for a short to ground. If no, go to next step.
    7. NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.
  7. Using the wiring diagram as a guide, inspect the wire harness and connectors. Pay particular attention to all power and ground circuits. If there are no possible causes remaining, replace PCM. Program the new PCM. See PROGRAMMING .
  8. The conditions required to set the DTC are not present at this time. Use the Freeze Frame Data to help you duplicate the conditions that set the DTC. Pay particular attention to the DTC set conditions, such as VSS, MAP, ECT, and Load. Visually inspect the related wire harness. Look for any chafed, pierced, pinched, or partially broken wires. Visually inspect the related wire harness connectors. Look for broken, bent, pushed out, or corroded terminals. Refer to any Technical Service Bulletins (TSB) that may apply. Perform a wiggle test of the LDP wiring while the circuit is actuated with the DRBIII®. Listen for the LDP to quit actuating. Also watch for the Good Trip counter to change to zero. Were any problems found? If yes, repair wiring harness/connectors as necessary. If no, test is complete.
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