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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 70 (Automatic Transmission Diagnosis - 4L80-E (Gasoline)) >> Diagnostic Tests >> DTC P0758: 2-3 Shift Solenoid Valve Circuit - Electrical Malfunction >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2002 GMC Cab & Chassis Sierra 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 a scan tool. Turn ignition on, engine off. Before clearing the DTCs, use the scan tool to record the freeze frame and failure records. Using the CLEAR INFO function erases the freeze frame and failure records from the PCM. Record the freeze frame and failure records. Clear the DTCs. Were DTC P0753 or P1860 also set? If so, go to next step. If not, go to step  4 .
  3. Inspect the transmission ignition fuse for an open. If you find an open fuse, inspect the following components for a short to ground:
    • Voltage Circuit (1020)
    • Three Solenoids
    • Transmission Internal Wiring Harness Assembly

    Repair the circuit, the solenoid, or replace the harness if necessary. Did you find and correct the condition? If so, go to step  16 . If not, go to next step.

  4. Using the scan tool, command the 2-3 shift solenoid valve on and off 3 times while listening to the bottom of the transmission pan. Use a stethoscope if needed. Does the solenoid click when commanded? If so, see DIAGNOSTIC AIDS  . If not, go to next step.
  5. Turn ignition off. Disconnect the transmission in-line 20-way connector. Additional DTCs will set. Install the Jumper Harness (J-44152) on the engine side of transmission in-line 20-way connector. Connect a 12-volt test light from the jumper harness terminal "E" to ground. Turn ignition on, engine off. Does the test light illuminate? If so, go to step  7 . If not, go to next step.
  6. Repair the open or high resistance in the 2-3 shift solenoid valve voltage circuit (1020). Did you find and correct the condition? If so, go to step  19 .
  7. Install the test light between jumper harness terminal "E" and "B". Using the scan tool, command the 2-3 shift solenoid valve on and off 3 times. Does the test light illuminate when you command the shift solenoid on, and go out when you command the shift solenoid off? If so, go to step  12 . If not, go to next step.
  8. Is the test lamp always on? If so, go to step  10 . If not, go to next step.
  9. Test the 2-3 shift solenoid valve control circuit (1223) for an open or short to power between the PCM connector C2 and the transmission in-line 20-way connector. Did you find and correct the condition? If so, go to step  19 . If not, go to step  11 .
  10. Test the 2-3 shift solenoid valve control circuit (1223) for an open or short to ground. Did you find and correct the condition? If so, go to step  19 . If not, go to next step.
  11. Replace the PCM. See POWERTRAIN CONTROL MODULE  under REMOVAL & INSTALLATION. Did you complete the replacement? If so, go to step  19 .
  12. Turn ignition off. Install jumper harness on the transmission side transmission in-line 20-way connector. Using DVOM and the Connector Test Adapter Kit (J-35616-A), measure the resistance between terminals "B" and "E". Does the resistance measure 19-31 ohms? If so, go to step  14 . If not, go to next step.
  13. Disconnect the wiring harness from the 2-3 shift solenoid valve. Measure the resistance of the 2-3 shift solenoid valve. Does the resistance measure 19-31 ohms? If so, go to step  17 . If not, go to step  18 .
  14. Measure the resistance between jumper harness terminal "B" and a good ground. Does the resistance measure greater than 250 k/ohms? If so, go to step  16 . If not, go to next step.
  15. Disconnect the wiring harness from the 2-3 shift solenoid valve. Measure the resistance from the 2-3 shift solenoid valve terminals to ground. Do both readings measure greater than 250 k/ohms? If so, go to step  17 . If not, go to step  18 .
  16. Measure the resistance between jumper harness terminal "B" and all other terminals, except terminals "A", "E", and "S". Is the resistance between terminal "B" and any other terminal, except terminals "A", "E", and "S", less than 250 k/ohms? If so, go to next step. If not, see DIAGNOSTIC AIDS  .
  17. Replace the transmission internal wiring harness assembly. See TRANSMISSION INTERNAL WIRING HARNESS  under REMOVAL & INSTALLATION. Did you complete the replacement? If so, go to step  19 .
  18. Replace the 2-3 shift solenoid valve. See SOLENOID VALVES  under REMOVAL & INSTALLATION. Did you complete the replacement? If so, go to next step.
  19. Perform the following procedure to verify the repair:
    • Select DTC.
    • Select CLEAR INFO.
    • Select the parameters, 2-3 SOLENOID, and 2-3 SOLENOID OPEN/SHORT TO GND, and 2-3 SOLENOID SHORT TO VOLTS.
    • Operate the vehicle
    • The PCM commands the 2-3 shift solenoid valve "ON", and the 2-3 SOLENOID SHORT TO VOLTS is "NO".
    • The PCM commands the 2-3 shift solenoid valve off, and the 2-3 SOLENOID OPEN/SHORT TO GND is "NO".
    • All conditions are met for 5 seconds.
    • Select SPECIFIC DTC.
    • Enter DTC P0758.

    Has the test run and passed? If so, system is okay. If not, go to step  1 .

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