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July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

DTC P1495: Leak Detection Pump Solenoid Circuit: Testing

  1. Turn ignition on. Using scan tool, read DTCs. If Good Trip counter is displayed for DTC P1495 and displayed count is "0", go to next step. If Good Trip counter is not displayed for DTC P1495 or displayed count is not "0", go to step  7.
  2. Turn ignition off. Disconnect LDP connector. LDP is located below driver's side of steering gear, above engine cradle. Inspect connector for damaged pins, corrosion and loose terminals. Repair connector as necessary. If connector is okay, turn ignition on. Using a test light connected to positive battery voltage, probe LDP solenoid control circuit at terminal No. 2 at LDP harness connector. Using scan tool, actuate LDP. If test light does not flash on and off, stop LDP activation and go to next step. If test light flashes on and off, replace LDP.
  3. Turn ignition on. Using a test light connected to ground, probe Pink/Gray wire at LDP harness connector. If test light illuminates brightly, disconnect test light and go to next step. If test light does not illuminate brightly, repair open in Pink/Gray wire. See WIRING DIAGRAMS article.
  4. Turn ignition off. Disconnect PCM connectors. PCM is located on left side of engine compartment, in front of battery. Measure resistance between ground and LDP solenoid control circuit at terminal No. 2 at LDP harness connector. If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, repair short to ground in LDP solenoid control circuit between LDP and PCM.
  5. Measure resistance of LDP solenoid control circuit between LDP harness connector and terminal No. 77 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 Violet/Light Blue wire.
  6. At this time PCM is assumed to be defective. Replace PCM. Program the new PCM. See PROGRAMMING .
  7. At this time, conditions for DTC to set do not exist or fault is an intermittent problem. Using scan tool, read and record Freeze Frame data. Road test vehicle under conditions in Freeze Frame data, paying particular attention to fault setting conditions such as speed, temperature, load and MAP vacuum. Visually inspect related connectors and wiring harness. Repair connectors and wiring harness as necessary. If connectors and wiring harness are okay, check for any related technical service bulletins that may apply. Start engine and allow it to idle. Using scan tool, perform LEAK DETECTION PUMP (LDP) TEST. Using scan tool, monitor LDP switch state while wiggling wiring harness from LDP to PCM. LDP is located below driver's side of steering gear, above engine cradle. PCM is located on left side of engine compartment, in front of battery. If LDP switch state stops toggling while wiggling wiring harness or if Good Trip counter display count changes to "0", repair wiring harness where wiggling caused toggling to stop. If LDP switch state does not stop toggling while wiggling wiring harness and Good Trip counter display count does not change to "0", no problem is indicated at this time. Test is complete.
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