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Test W: One Or More Corners Low, No Codes Retrieved & Compressor Inoperative

  1. Check Relay Connector  Disconnect air compressor relay 4-pin connector. Relay is located front center of engine compartment. Check connector for corrosion, bent pins and damaged wires. If connector is okay, go to next step. If connector is worn or damaged, repair as necessary and repeat ON-DEMAND SELF-TEST and PNEUMATIC TEST under DIAGNOSTIC TEST MODE  .
  2. Check Compressor Operation  Connect a jumper wire between Light Blue/Pink wire and Purple/Orange wire at relay connector. If compressor does not run, remove jumper wire and go to next step. If compressor runs, go to TEST Q  and then to TEST R  .
  3. Check For Battery Voltage  Measure voltage between ground and Light Blue/Pink wire at relay connector. If battery voltage is present, go to next step. If battery voltage is not present, go tostep 7).
  4. Check Circuit Continuity  Disconnect air compressor connector. Check resistance of Purple/Orange wire between relay connector and air compressor connector. If resistance is less than 3 ohms, go to next step. If resistance is 3 ohms or more, repair open in Purple/Orange wire. Repeat ON-DEMAND SELF-TEST and PNEUMATIC TEST under DIAGNOSTIC TEST MODE  .
  5. Check Ground Circuit  Measure resistance between ground and Black wire at air compressor connector. If resistance is less than 3 ohms, go to next step. If resistance is 3 ohms or more, repair open in Black wire between ground and compressor connector. Repeat ON-DEMAND SELF-TEST and PNEUMATIC TEST under DIAGNOSTIC TEST MODE  .
  6. Check Compressor Operation  Connect a jumper wire between positive battery terminal and Purple/Orange wire at air compressor. Connect another jumper wire between negative battery terminal and Black wire at air compressor. If compressor runs, no problem is indicated at this time. Repeat ON-DEMAND SELF-TEST and PNEUMATIC TEST under DIAGNOSTIC TEST MODE  . If compressor does not run, replace compressor. Repeat ON-DEMAND SELF-TEST and PNEUMATIC TEST under DIAGNOSTIC TEST MODE  .
  7. Check Compressor Fuse  Remove and inspect No. 3 (60-amp) fuse from power distribution center, on left side of engine compartment. If fuse is blown, go to next step. If fuse is okay, repair open Light Blue/Pink wire between power distribution center and air compressor relay. Repeat ON-DEMAND SELF-TEST and PNEUMATIC TEST under DIAGNOSTIC TEST MODE  .
  8. Check Circuit No. 417  Disconnect air compressor connector. Measure resistance between ground and Purple/Orange wire at air compressor connector. If resistance is 10,000 ohms or more, go to next step. If resistance is less than 10,000 ohms, repair short to ground in Purple/Orange wire between power distribution center and air compressor connector. Replace fuse and repeat ON-DEMAND SELF-TEST and PNEUMATIC TEST under DIAGNOSTIC TEST MODE  .
  9. Check Circuit No. 430  Measure resistance between ground and Gray wire at air compressor connector. If resistance is less than 3 ohms, go to next step. If resistance is 3 ohms or more, repair open in Gray wire between ground and air compressor connector. Repeat ON-DEMAND SELF-TEST and PNEUMATIC TEST under DIAGNOSTIC TEST MODE  .
  10. Check Compressor Operation  Connect a jumper wire between positive battery terminal and Purple/Orange wire at air compressor. Connect another jumper wire between negative battery terminal and Black wire at air compressor. If compressor runs, no problem is indicated at this time. Replace fuse. Repeat ON-DEMAND SELF-TEST and PNEUMATIC TEST under DIAGNOSTIC TEST MODE  . If compressor does not run, replace compressor. Repeat ON-DEMAND SELF-TEST and PNEUMATIC TEST under DIAGNOSTIC TEST MODE  .
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