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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 82 (Automatic Transmission Diagnosis - ALLISON) >> Diagnostic Tests >> DTC P0743/P1860: Torque Converter Clutch - Electrical >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2002 GMC Sierra, 2002 GMC Cab & Chassis Sierra, 2002 Chevrolet Silverado, and 2002 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Did you perform the diagnostic system check? If so, go to next step. If not, see DIAGNOSTIC SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM.
  2. Install the scan tool. Turn ignition on, engine off. Record the DTC failure records. Start the engine. Using the scan tool, check ignition voltage. Is the voltage 9-18 volts? If so, go to next step. If not, see DTC P0562: SYSTEM VOLTAGE LOW  or DTC P0563: SYSTEM VOLTAGE HIGH  .
  3. Disconnect the C2 connector from the TCM. Turn ignition on, engine off. Connect DVOM set to DC scale between TCM connector C2 terminals No. 29 and 32. Use the scan tool in solenoid test mode to command solenoid "F" on and off. Is the voltage 10-13 volts when solenoid "F" is commanded on, and zero volts when commanded off? If so, go to next step. If not, go to step  10.
  4. Disconnect the transmission in-line 20-way connector. Turn ignition on, engine off. Connect a DVOM set to DC scale to engine side of transmission in-line 20-way connector between terminals "J" and "S". Use the scan tool in solenoid test mode to command solenoid "F" on and off. Is the voltage 10-13 volts when solenoid "F" is commanded on, and zero volts when commanded off? If so, go to next step. If not, go to step  6.
  5. Turn the ignition off. Measure the resistance between transmission side of transmission in-line 20-way connector terminals "J" and "S". See COMPONENT RESISTANCE  under ELECTRONIC COMPONENT SPECIFICATIONS. Is the solenoid resistance within the specified value? If so, see DIAGNOSTIC AIDS . If not, go to step  7.
  6. Repair the vehicle wiring harness. Is the repair complete? If so, go to step  11.
  7. Remove the oil pan. See appropriate AUTOMATIC article in TRANSMISSION SERVICING. Disconnect wiring harness at solenoid "F". Measure the resistance of solenoid "F". See COMPONENT RESISTANCE  under ELECTRONIC COMPONENT SPECIFICATIONS. Is the solenoid resistance within the specified value? If so, go to next step. If not, go to step  9.
  8. Replace the internal wiring harness. See TRANSMISSION INTERNAL WIRING HARNESS  under REMOVAL & INSTALLATION. Is the replacement complete? If so, go to step  11.
  9. Replace solenoid "F". See SOLENOID VALVES  under REMOVAL & INSTALLATION. Is the replacement complete? If so, go to step  11.
    10. CAUTION: In most cases, the TCM is not at fault. Investigate thoroughly before replacing the TCM.
  10. Replace the TCM. See TRANSMISSION CONTROL MODULE  under REMOVAL & INSTALLATION. Is the replacement complete? If so, go to next step.
  11. Perform the following procedure to verify the repair:
    • Clear the DTC.
    • Drive the vehicle under normal operating conditions.
    • Using the scan tool, monitor the operation of solenoid "F" (TCC).

    Did the DTC return? If so, go to step  1. If not, system is okay.

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