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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-188A - O/D Switch Low Rationality (DTC 45)

Test TC-188A - O/D Switch Low Rationality (DTC 45)

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. Turn ignition off. Disconnect Powertrain Control Module (PCM) connectors. Inspect connectors and terminals for damage. Repair connectors and terminals as necessary. If connectors and terminals are okay, go to next step.
  2. Using scan tool in ohmmeter mode, measure resistance at terminal No. 13 at PCM Gray connector. Press O/D off switch 2 or 3 times. If resistance changes while pressing button, replace PCM. If resistance does not change, go to next step.
  3. Disconnect O/D switch connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary. If connector and terminals are okay, go to next step.
  4. Using scan tool in ohmmeter mode, measure resistance at terminal No. 6 on O/D switch connector. If resistance is less than 5 ohms, repair short to ground in O/D switch sense circuit. If resistance is 5 ohms or more, go to next step.
  5. Using an external ohmmeter, measure resistance between terminal No. 13 at PCM Gray connector and terminal No. 6 at O/D switch connector. If resistance is 5 ohms or more, repair open O/D switch sense circuit. If resistance is less than 5 ohms, replace O/D switch.
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