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Test TC-183A - Leak Detection Pump Solenoid Circuit

NOTE: For connector terminal ID, see the CONNECTOR IDENTIFICATION DIRECTORY. For wiring diagram, see WIRING DIAGRAMS - 8.0L article.
  1. Start engine and allow it to idle. Using scan tool, read and note Leak Detection Pump (LDP) pressure switch status. Using scan tool, actuate LDP solenoid. If status does not switch from DOWN to UP, go to step 6). If status switches from DOWN to UP, go to next step.
  2. Using scan tool, stop LDP solenoid actuation. Using scan tool, read LDP pressure switch status. If status does not switch from UP to DOWN, go to step 6). If status switches from UP to DOWN, go to next step.
  3. Condition required to set DTC is not present at this time. LEAK DETECTION PUMP SOLENOID CKT DTC sets if Powertrain Control Module (PCM) does not sense state of solenoid changing. Possible causes are: open or shorted LDP solenoid control circuit, defective LDP solenoid, or open fused ignition switch. Go to next step.
  4. Inspect all related wiring and connectors. Repair wiring and connectors as necessary and perform TEST VER-5A. If wiring and connectors are okay, go to next step.
  5. Using scan tool, actuate LDP solenoid. Wiggle wiring harness from LDP solenoid to PCM while monitoring LDP switch status. If status switches from UP to DOWN at any time while wiggling wiring harness, repair wiring harness as necessary and perform TEST VER-5A. If status does not change, see INACTIVE TROUBLE CODE CONDITION . Test is complete. Perform TEST VER-5A.
  6. Turn ignition off. Disconnect LDP solenoid connector. Turn ignition on. Using scan tool in voltmeter mode, check voltage on LDP solenoid connector, fused ignition switch output circuit (Red/Orange wire). If voltage is 10 volts or less, repair open fused ignition switch circuit and perform TEST VER-5A. If voltage is more than 10 volts, go to next step.
  7. Turn ignition off. Disconnect Powertrain Control Module (PCM) connectors. Inspect connectors and terminals for damage. Repair connectors and terminals as necessary and perform TEST VER-5A. If connectors and terminals are okay, go to next step.
  8. Using an external ohmmeter, check resistance of LDP solenoid control circuit (Dark Green/Red wire) from LDP connector to PCM Gray connector. If resistance is 5 ohms or more, repair open LDP solenoid control circuit and perform TEST VER-5A. If resistance is less than 5 ohms, go to next step.
  9. Using scan tool in ohmmeter mode, check resistance of PCM Gray connector, LDP solenoid control circuit (Dark Green/Red wire). If resistance is less than 5 ohms, repair short to ground in LDP solenoid control circuit and perform TEST VER-5A. If resistance is 5 ohms or more, go to next step.
  10. Reconnect LDP connector. Turn ignition on. Using scan tool in voltmeter mode, check voltage on PCM Gray connector, LDP solenoid control circuit (Dark Green/Red wire). If voltage is 10 volts or less, replace LDP and perform TEST VER-5A. If voltage is more than 10 volts, replace PCM and perform TEST VER-5A.
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