Test 15A - Od Hydraulic Pressure Switch (DTC 31)

NOTE: Perform TEST 2A before proceeding with this test. For connector terminal identification, see CONNECTOR IDENTIFICATION . For wiring diagrams, see WIRING DIAGRAMS . Perform VERIFICATION TEST VER-1A after each repair.

CAUTION: Always turn ignition switch to OFF position prior to disconnecting or connecting any module connector.

NOTE: Transmission Control Module (TCM) replacement will not correct DTC 31.

Connect a 0-300 psi gauge to OD pressure port. See AUTO TRANS OVERHAUL - CHRYSLER 41TE/AE article. Disconnect transmission control relay connector. Connect jumper wire between terminals "B" and "D" of transmission control relay connector. Raise and support front of vehicle. Apply service brakes and start vehicle. DO NOT allow wheels to rotate.
Move shift lever to OD position. Using scan tool, actuate OD solenoid. Read and record pressure gauge reading. It may be necessary to raise engine RPM slightly above idle.
If pressure gauge readings fluctuate between 0 and 75-95 psi every 3 seconds, replace solenoid pack. If pressure does not fluctuate, code may be set by the following causes;
- Low or high fluid level.
- Solenoid pack internal malfunction.
- Internal transaxle malfunction.