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Home >> Jeep >> 1996 >> Grand Cherokee Limited, 5.2 Y >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Diagnosis - 42RE & 44RE & 46RE & 47RE Automatic Transmission (W/O TCM) >> Diagnostic Tests >> Test TC-173A - Trans 12-Volt Supply Relay Control Circuit DTC 45/P1765)

Test TC-173A - Trans 12-Volt Supply Relay Control Circuit DTC 45/P1765)

CAUTION: Always turn ignition switch to OFF position prior to disconnecting or connecting any module connector.
NOTE: For connector terminal identification, you should refer to CONNECTOR IDENTIFICATION . For appropriate wiring diagram, see WIRING DIAGRAMS . You should also perform the VERIFICATION TEST VER-1A  after each repair.
  1. Using scan tool, actuate transmission control relay. If transmission control relay does not click, go to step 5). If transmission control relay clicks, go to next step.
  2. Condition required to set DTC is not present at this time. TRANS 12-VOLT SUPPLY RELAY CNTRL CIRCUIT DTC sets if transmission control relay is not in a state requested by Powertrain Control Module (PCM) for more than 3 seconds. Possible causes are: defective relay, open or shorted control circuit, defective PCM, or defective connector terminals. Go to next step.
  3. Inspect all related wiring and connectors. Repair wiring and connectors as necessary. If wiring and connectors are okay, go to next step.
  4. Wiggle wiring harness from transmission control relay to PCM. Ensure scan tool is still actuating transmission control relay. If transmission control relay stops clicking, repair wiring harness as necessary. If transmission control relay continues clicking, see INACTIVE DTC CONDITION . Test is complete.
  5. Remove transmission control relay. Inspect connector and terminals for damage. Repair connector and terminals as necessary. If connector and terminals are okay, go to next step.
  6. Using scan tool in voltmeter mode, measure voltage at fused ignition switch output circuit terminal on transmission control relay connector. If voltage is 10 volts or less, repair open fused ignition switch output circuit. If voltage is more than 10 volts, go to next step.
  7. Using an external ohmmeter, measure resistance between transmission control relay terminals No. 85 and 86. If resistance is 100 ohms or more, replace transmission control relay. If resistance is less than 100 ohms, go to next step.
  8. Turn ignition off. Disconnect Powertrain Control Module (PCM) White connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary. If connector and terminals are okay, go to next step.
  9. Using scan tool in ohmmeter mode, measure resistance at terminal No. 30 on PCM White connector. If resistance is less than 5 ohms, repair short to ground in transmission relay control circuit. If resistance is 5 ohms or more, go to next step.
  10. Using an external ohmmeter, measure resistance between terminal No. 30 on PCM White connector and transmission relay control circuit terminal on transmission control relay connector. If resistance is 5 ohms or more, repair open transmission relay control circuit. If resistance is less than 5 ohms, replace PCM.
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