TC31 - Check Harness and Connectors For Opens or Shorts

- Key "OFF".

- Disconnect Powertrain Control Module (PCM). Inspect for damaged or pushed out pins, corrosion, loose wires, etc. Service as necessary.

- Install breakout box or 4EAT Tester. Leave PCM disconnected.

- Key "ON", engine "OFF".

Test Pin Chart:

- Refer to the chart above. Connect a test lamp between suspect shift solenoid test pins and test pin 37 (VPWR) at the breakout box.

- Observe test lamp for an indication of a fault while performing the following (the lamp will normally be on, but not to full brightness due to the 12-25 ohm resistance to ground through the shift solenoid; an open or short to power will be indicated by the light turning "OFF"; and short to ground may be detected by the light getting brighter):

- Shake, wiggle and bend the shift solenoid circuit from the transmission to PCM. Lightly exercise harness connectors.

- Key "OFF".

- Is a fault indicated?

Yes -- Isolate fault and service as necessary. Remove breakout box. Reconnect all components. Rerun quick test. Quick Test Appendix (Detailed Testing Instructions)

No -- Go to TC32. TC32 - Check Harness For Intermittent Shorts to Ground