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Home >> Jeep >> 1996 >> Grand Cherokee Limited, 5.2 Y >> Repair and Diagnosis >> External Pages >> Different car >> Section 4 (Engine Controls - Tests W/Codes - 3.0L) >> Diagnostic Charts >> Test TC-29A - Auto Shutdown Relay Control Circuit (DTC 42)

Test TC-29A - Auto Shutdown Relay Control Circuit (DTC 42)

WARNING: This page is about a different car, the 1994 Plymouth Sundance, 1994 Plymouth Acclaim, 1994 Dodge Spirit, 1994 Dodge Shadow, and 1994 Chrysler LeBaron. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION DIRECTORY  . For wiring diagrams, see WIRING DIAGRAMS  .
  1. Using DRB, erase trouble codes. Using DRB, actuate Auto Shutdown (ASD) relay. If ASD relay is clicking, go to next step. If ASD relay is not clicking, go to step 5).
  2. At this time, condition required to set trouble code is not present. AUTO SHUTDOWN RELAY CONTROL CIRCUIT trouble code sets if an open or short is detected in ASD relay control circuit. Possible causes are: ASD relay coil open or shorted, open in ASD relay Red/White wire, open or short in ASD relay Dark Blue/Yellow wire, or inoperative circuit driver in PCM. Go to next step.
  3. Inspect all related wiring and connectors and repair as necessary. Perform TEST VER-2  . If no problems are found with wiring and connectors, go to next step.
  4. Start engine. Wiggle wiring harness from ASD relay to PCM. If engine stalled while wiggling wiring harness, repair wiring and connectors as necessary. Perform TEST VER-2. If engine did not stall while wiggling wiring harness, see INACTIVE TROUBLE CODE CONDITION  . Perform TEST VER-2.
  5. Disconnect ASD relay. Put DRB in voltmeter mode. Using DRB, check voltage on ASD relay connector Dark Blue wire. If voltage is less than 10 volts, repair open in appropriate wire. Perform TEST VER-2. If voltage is more than 10 volts, turn ignition off.
  6. Using an external ohmmeter, check resistance between ASD relay terminals. See Fig 1 . If resistance is more than 100 ohms, replace ASD relay. If resistance is less than 100 ohms, go to next step.
    Fig 1: Testing Relay (TC-29A)
    G94C31759
  7. Disconnect PCM connector. Put DRB in ohmmeter mode. Using DRB, check resistance of ASD relay connector Dark Blue/Yellow wire. If resistance is less than 5 ohms, repair short to ground in Dark Blue/Yellow wire. Perform TEST VER-2. If resistance is more than 5 ohms, go to next step.
  8. Using an external ohmmeter, check resistance of Dark Blue/Yellow wire between ASD relay connector and PCM connector terminal No. 51. If resistance is more than 5 ohms, repair open in Dark Blue/Yellow wire. Perform TEST VER-2. If resistance is less than 5 ohms, replace PCM. Perform TEST VER-2.
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