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Home >> Chevrolet >> 2001 >> Camaro Base, 2D Convertible, Automatic >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Automatic Transmission Diagnosis - 4L60-E >> Diagnostic Tests >> DTC P0758: 2-3 Shift Solenoid Circuit - Electrical Malfunction >> Diagnostic Procedure

Diagnostic Procedure

  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. Connect scan tool to DLC. Turn ignition on, engine off. Using scan tool, record freeze frame and failure records for reference, and then clear DTCs. If DTCs P0740, P0753, P0785 or P1860 is present, go to next step. If DTCs P0740, P0758, P0785 or P1860 is not present, go to step  4.
  3. Check condition of shift solenoid circuit fuse. See WIRING DIAGRAMS . If fuse is open, go to step  12. If fuse is okay, go to step  5.
  4. Using scan tool, command 2-3 shift solenoid valve on and off while listening to bottom of transmission oil pan. If solenoid clicks as commanded, see DIAGNOSTIC AIDS . If solenoid does not click, go to next step.
  5. Turn ignition off. Disconnect transmission 20-pin in-line harness connector. Connect appropriate jumper harness to engine side of in-line harness connector. Turn ignition on, engine off. Using test light connected to ground, probe terminal "E" of jumper harness. If test light illuminates, go to next step. If test light does not illuminate, go to step  15.
  6. Connect test light between terminals "B" and "E" of jumper harness. Using scan tool, command 2-3 shift solenoid valve on and off 3 times. If test light illuminates with scan tool command, go to step  8. If test light does not illuminate with scan tool command, go to next step.
  7. If test light is always on, go to step  16. If test light is not always on, go to step  17.
  8. Connect appropriate jumper harness to transmission side of in-line harness connector. Measure resistance between terminals "B" and "E" of jumper harness. If resistance is 19-31 ohms, go to next step. If resistance is not 19-31 ohms, leave DVOM connected and go to step  10.
  9. Measure resistance between ground and terminal "B" of jumper harness, and then between ground and terminal "E" of jumper harness. If both measurements are greater than 250 k/ohms, see DIAGNOSTIC AIDS . If both measurements are not greater than 250 k/ohms, go to step  11.
  10. Remove transmission oil pan. Disconnect transmission wiring harness assembly from 2-3 shift solenoid valve. If resistance is 19-31 ohms, go to step  18. If resistance is not 19-31 ohms, go to step  19.
  11. Remove transmission oil pan. Disconnect transmission wiring harness assembly from 2-3 shift solenoid valve. Measure resistance between ground and terminals of 2-3 shift valve. If both measurements are greater than 250 k/ohms, go to step  18. If both measurements are not greater than 250 k/ohms, go to step  19.
    12. NOTE: Condition affecting shift solenoid valve circuit may be caused by a fault in other circuits spliced to shift solenoid valve circuit.
  12. Check 2-3 shift solenoid valve ignition feed circuit for short to ground between engine wiring harness junction block and transmission 20-pin in-line harness connector. Repair as necessary. After repairs, go to step  21. If circuit is okay, go to next step.
    13. NOTE: Condition affecting shift solenoid valve circuit may be caused by a fault in other circuits spliced to shift solenoid valve circuit.
  13. Check 2-3 shift solenoid valve ignition feed circuit for short to ground between 2-3 shift solenoid valve and transmission 20-pin in-line harness connector. If circuit is shorted, go to step  18. If circuit is okay, go to next step.
  14. Check each solenoid for short to ground. Repair as necessary. After repairs, go to step  21.
    15. NOTE: Condition affecting shift solenoid valve circuit may be caused by a fault in other circuits spliced to shift solenoid valve circuit.
  15. Check for open in 2-3 shift solenoid valve ignition feed circuit. Repair as necessary. After repairs, go to step  21.
  16. Check 2-3 shift solenoid valve control circuit for short to ground between transmission 20-pin in-line harness connector and PCM. Repair as necessary. After repairs, go to step  21. If circuit is okay, go to step  20.
  17. Check 2-3 shift solenoid valve control circuit for open or short to voltage between transmission 20-pin in-line harness connector and PCM. Repair as necessary. After repairs, go to step  21. If circuit is okay, go to step  20.
  18. Replace transmission wiring harness assembly. See appropriate AUTOMATIC article in TRANSMISSION SERVICING. After repairs, go to step  21.
  19. Replace 2-3 shift solenoid valve. See appropriate AUTOMATIC article in TRANSMISSION SERVICING. After repairs, go to step  21.
  20. Replace PCM. After replacement, program PCM. See appropriate REMOVAL, OVERHAUL & INSTALLATION article in ENGINE PERFORMANCE. After repairs, go to next step.
  21. Using scan tool, clear DTCs. Test drive vehicle in "D4" range. Ensure when PCM commands 2-3 shift solenoid on, feedback voltage decreases to zero, and then increases to battery voltage when commanded off. Ensure each condition is met for at least 5 seconds. Check for DTCs. If DTC P0758 does not return, system is okay. If DTC P0758 returns, repeat step  1.
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