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Test TC-184A - Leak Detection Pump Switch Or Mechanical Fault

NOTE: For connector terminal ID, see CONNECTOR IDENTIFICATION  Directory. For wiring diagram, see WIRING DIAGRAMS article.
  1. Start engine and allow to idle. Using scan tool, read Leak Detection Pump (LDP) pressure switch state. Using scan tool, actuate LDP solenoid. With scan tool actuating LDP solenoid, observe LDP pressure switch state.
  2. If scan tool indicates LDP pressure switch changed from up to down, go to next step. If scan tool does not indicate LDP pressure switch changed from up to down, go to step 7).
  3. Using scan tool, stop actuation of LDP solenoid. Using scan tool, read LDP pressure switch state. If scan tool indicates LDP pressure switch changed from down to up, go to next step. If scan tool does not indicate LDP pressure switch changed from down to up, go to step 7).
  4. Condition to set trouble code is not present at this time. LEAK DETECTION PUMP SOLENOID CIRCUIT DTC sets if solenoid state does not change when solenoid is energized. Possible causes are: open or shorted LDP switch sense circuit, LDP switch failure or open fused ignition switch output circuit. Go to next step.
  5. Inspect all related wiring and connectors and repair as necessary. If no problems were found with wiring and connectors, go to next step. If related wiring and connectors were repaired, perform TEST VER-5A.
  6. Using scan tool, actuate LDP solenoid. While monitoring LDP switch state, wiggle wiring harness from LDP solenoid to PCM connector. If LDP switch state changed from down to up when wiggling wiring harness, repair wiring harness where wiggling caused problem to appear. Perform TEST VER-5A. If LDP switch state did not change from down to up when wiggling harness, see INACTIVE TROUBLE CODE CONDITION . Test is complete. Perform TEST VER-5A.
  7. Tee a vacuum gauge into LDP solenoid vacuum supply line. LDP is located under right front headlight assembly. To access LDP, remove right front headlight assembly. See Fig 1. Go to next step.
    Fig 1: Locating Leak Detection Pump
    G96B01585
  8. Start engine and observe vacuum gauge. If vacuum gauge indicates to within one in. Hg of engine vacuum, go to next step. If vacuum gauge does not indicate to within one in. Hg of engine vacuum, repair leak or obstruction in LDP solenoid vacuum supply hose. Perform TEST VER-5A.
  9. Turn ignition off. Disconnect Powertrain Control Module (PCM) connector. Turn ignition on. Using scan tool in voltmeter mode, check voltage of PCM connector terminal No. 72 (Orange/Dark Green wire). If voltage is 10 volts or less, go to next step. If voltage is more than 10 volts, replace LDP. Perform TEST VER-5A.
  10. Disconnect LDP solenoid connector. Using scan tool, check voltage of Dark Blue/White wire at LDP solenoid connector. If voltage is 10 volts or less, go to next step. If voltage is more than 10 volts, repair open Dark Blue/White wire. Perform TEST VER-5A.
  11. Using an external ohmmeter, check resistance of Orange/Dark Green wire between LDP solenoid connector and PCM connector terminal No. 72. If resistance is less than 5 ohms, replace LDP. Perform TEST VER-5A. If resistance is 5 ohms or more, repair open Orange/Dark Green wire. Perform TEST VER-5A.
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