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Test C: Torque Converter Clutch Electrical Circuit: Testing

  1. Electronic Diagnostics

    Ensure transmission harness connector is in acceptable condition and fully seated in solenoid body connector. Repair as necessary. Install NGS tester to DLC. Perform KEY-ON-ENGINE-OFF (KOEO) SELF-TEST  until continuous memory code(s) have been displayed. See QUICK TEST  under DIAGNOSIS & TESTING. Select OUTPUT TEST MODE (OTM), select ALL ON and press START to activate outputs. If vehicle enters OTM, remain in OTM and go to next step. If vehicle will not enter OTM, see SCAN TOOL UNABLE TO COMMUNICATE  under DIAGNOSIS & TESTING.

  2. Check Electrical Signal Operation

    Disconnect transmission 12-pin harness connector. Inspect condition of connector. Repair as needed. Using DVOM, connect positive lead to transmission harness connector VPWR terminal No. 1 (Violet/White wire), and connect negative lead to TCC terminal No. 4 (Violet/Yellow wire). See Figure. Set DVOM to 20-volt scale. Press START then STOP to cycle solenoid output on and off. If voltage changes to battery voltage, go to step  6. If voltage does not change or is low, go to next step.

  3. Check Continuity Of TCC Solenoid Signal & VPWR Harness Circuits

    Turn ignition switch to OFF position. Disconnect PCM 104-pin harness connector, and inspect it for damaged terminals, corrosion and loose wires. Repair as necessary. Install breakout box, leaving PCM disconnected. On California models equipped with 7.3L diesel engine and all gasoline engines, measure and record resistance between breakout box pin No. 54 and transmission harness connector terminal No. 4 (Violet/Yellow wire). On Federal models equipped with 7.3L diesel engines, measure and record resistance between breakout box pin No. 28 and transmission harness connector terminal No. 4 (Violet/Yellow wire). On all models, measure and record resistance between breakout box pins No. 71 and 97 and transmission harness connector terminal No. 1 (Red/Yellow wire). See Figure. If each resistance is less than 5 ohms, go to next step. If any resistance is 5 ohms or more, repair open circuit. Reconnect all connectors. Disconnect breakout box. Repeat QUICK TEST  under DIAGNOSIS & TESTING.

  4. Check TCC Circuit For Short To Power

    On California models equipped with 7.3L diesel engine and all gasoline engines, measure and record resistance between breakout box pin No. 54 and breakout box pins No. 71 and 97. On Federal models equipped with 7.3L diesel engines, measure and record resistance between breakout box pin No. 28 and breakout box pins No. 71 and 97. See Figure. If each resistance is more than 10 k/ohms, go to next step. If any resistance is 10 k/ohms or less, repair short circuit. Disconnect breakout box. Reconnect all connectors. Repeat QUICK TEST  under DIAGNOSIS & TESTING.

  5. Check TCC Circuit For Short To Ground

    On California models equipped with 7.3L diesel engine and all gasoline engines, measure and record resistance between breakout box pin No. 54 and breakout box pins No. 24, 51, 76, 77, 91, 103, and ground. On Federal models equipped with 7.3L diesel engines, measure and record resistance between breakout box pin No. 28 and breakout box pins No. 24, 51, 76, 77, 91, 103, and ground. If all resistances are more than 10 k/ohms, go to next step. If any resistances are 10 k/ohms or less, repair short circuit(s). Disconnect breakout box. Reconnect all connectors. Repeat QUICK TEST  under DIAGNOSIS & TESTING.

  6. Solenoid Functional Test

    Connect transmission tester to transmission connector. Perform SOLENOID VOLTAGE test. See tester manufacturer's instructions. If solenoid activates (LED Green), go to next step. If LED does not light (solenoid shorted to ground or open circuit), or indicates short to battery voltage (LED Red), go to step  8.

  7. Transmission Drive Test

    Reconnect PCM 104-pin harness connector. Perform DYNAMIC TESTING - ENGINE ON test. See tester manufacturer's instructions. If TCC solenoid activates (LED Green) and engine RPM decreases when operated with tester, replace PCM. Erase all DTCs. See CLEARING DIAGNOSTIC TROUBLE CODES  under DIAGNOSIS & TESTING. Perform TRANSMISSION DRIVE CYCLE TEST  under DIAGNOSIS & TESTING. Repeat QUICK TEST . If DTCs are still present, see NO TCC ENGAGEMENT , TCC ALWAYS ENGAGED  or TCC CYCLING OR SHUDDERING  in SYMPTOM DIAGNOSIS under TROUBLE SHOOTING. If engine RPM does not decrease when operated by tester, go to next step.

  8. Check Resistance Of TCC Solenoid

    Set tester Bench/Drive switch to BENCH MODE. Set Select Switch on tester to OHMS CHECK. Connect ohmmeter negative lead to transmission tester TCC solenoid terminal and positive lead to VPWR terminal. Measure and record resistance. Resistance should be 20-30 ohms for gasoline vehicles and 10-20 ohms for diesel vehicles. If resistance is within specification, go to next step. If resistance is not within specification, replace solenoid body assembly. Erase all DTCs. Road test vehicle. Repeat QUICK TEST  under DIAGNOSIS & TESTING.
    9. NOTE: The following test should be performed with a digital ohmmeter or low current tester (less than 200 milliamps).

  9. Check Solenoid For Short To Ground
    Check continuity between BAT (-) tester terminal and both TCC solenoid terminals. If continuity exists, replace solenoid body assembly. Erase all DTCs. Road test vehicle. Repeat QUICK TEST  under DIAGNOSIS & TESTING. If continuity does not exist, see NO TCC ENGAGEMENT , TCC ALWAYS ENGAGED  or TCC CYCLING OR SHUDDERING  in SYMPTOM DIAGNOSIS under TROUBLE SHOOTING.
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