LEMON Manuals: Even more car manuals for everyone
Home >> Jeep >> 1996 >> Grand Cherokee Limited, 5.2 Y >> Repair and Diagnosis >> External Pages >> Different car >> Section 208 (Diagnosis - 42RE (W/TCM)) >> Diagnostic Trouble Code Tests >> Test 5A - No Output Shaft Sensor Signal (DTC 12)

Test 5A - No Output Shaft Sensor Signal (DTC 12)

WARNING: This page is about a different car, the 1995 Jeep Grand Cherokee. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Perform TEST 2A  before proceeding with this test. For connector terminal identification, see CONNECTOR IDENTIFICATION  . For wiring diagram, see WIRING DIAGRAM  . Perform TEST 3A - VERIFICATION TEST  after each repair.
CAUTION: Always turn ignition switch to OFF position prior to disconnecting or connecting any module connector.
  1. Ensure ignition is off. Disconnect Transmission Control Module (TCM). Use external ohmmeter. Measure resistance between terminals No. E7 and F7 on TCM connector. If resistance is 750-820 ohms, replace TCM. If resistance is not 750-820 ohms, go to next step.
  2. Turn key on. Disconnect output shaft speed sensor. Use scan tool in voltmeter mode. Measure voltage at terminal No. 1 on sensor harness connector. If voltage is 1 volt or greater, repair output shaft speed signal (+) circuit for short to battery voltage. If voltage is less than 1 volt, go to next step.
  3. Use scan tool in voltmeter mode. Measure voltage at terminal No. 2 on sensor harness connector. If voltage is 1 volt or greater, repair output shaft speed signal (-) circuit for short to battery voltage. If voltage is less than 1 volt, go to next step.
  4. Turn ignition off. Use scan tool in ohmmeter mode. Measure resistance at terminal No. 1 on output shaft speed sensor connector. If resistance is less than 5 ohms, repair shaft speed sensor (+) circuit for short to ground. If resistance is 5 ohms or greater, go to next step.
  5. Use scan tool in ohmmeter mode. Measure resistance at terminal No. 2 on output shaft speed sensor connector. If resistance is less than 5 ohms, repair shaft speed sensor (-) circuit for short to ground. If resistance is 5 ohms or greater, go to next step.
  6. Connect jumper wire between ground and terminal No. 1 on output shaft speed connector. Using scan tool in ohmmeter mode. Measure resistance at terminal No. E7 on TCM connector. If resistance is 5 ohms or greater, repair open shaft speed sensor (+) circuit. If resistance is less than 5 ohms, go to next step.
  7. Move jumper wire between ground and terminal No. 2 on output shaft speed connector. Using scan tool in ohmmeter mode. Measure resistance at terminal No. F7 on TCM connector. If resistance is 5 ohms or greater, repair open shaft speed sensor (-) circuit. If resistance is less than 5 ohms, replace output shaft speed sensor.
scientia non olet · About LEMON Manuals