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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 P1860: TCC PWM Solenoid 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, P0758 or P0785 are also present, go to next step. If DTCs P0740, P0753, P0758 and P0785 are not present, go to step  4.
  3. Check condition of TCC solenoid valve circuit fuse. If fuse is open, go to step  11. If fuse is okay, go to next step.
  4. 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" at jumper harness. If test light illuminates, go to next step. If test light does not illuminate, go to step  14.
  5. Connect test light between terminals "E" and "U" at jumper harness. Using scan tool, command TCC solenoid valve on and off 3 times. If test light illuminates with scan tool command, go to step  7. If test light does not illuminate with scan tool command, go to next step.
  6. If test light remains illuminated, go to step  15. If test light does not remain illuminated, go to step  16.
  7. Connect jumper harness to transmission side of in-line harness connector. Measure resistance between terminals "E" and "U" of jumper harness. If resistance is 10-15 ohms, go to next step. If resistance is not 10-15 ohms, go to step  9.
  8. Measure resistance between ground and terminal "E" of jumper harness, and then between ground and terminal "U" 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  10.
  9. Remove transmission oil pan. Disconnect transmission wiring harness assembly from TCC solenoid valve. Measure resistance of TCC solenoid valve. If resistance is 10-15 ohms, go to step  17. If resistance is not 10-15 ohms, go to step  18.
  10. Remove transmission oil pan. Disconnect transmission wiring harness assembly from TCC solenoid valve. Measure resistance between ground and each terminal of TCC solenoid valve. If both measurements are greater than 250 k/ohms, go to step  17. If both measurements, are not greater than 250 k/ohms, go to step  18.
    11. NOTE: Condition affecting TCC solenoid valve circuit may be caused by a fault in other circuits spliced to TCC solenoid valve circuit.
  11. Check TCC 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  20. If circuit is okay, go to next step.
    12. NOTE: Condition affecting TCC solenoid valve circuit may be caused by a fault in other circuits spliced to TCC solenoid valve circuit.
  12. Check TCC solenoid valve ignition feed circuit for short to ground between TCC solenoid valve and transmission 20-pin in-line harness connector. If circuit is shorted, go to step  17. If circuit is okay, go to next step.
  13. Check each solenoid valve for short to ground. Repair as necessary. After repairs, go to step  20.
    14. NOTE: Condition affecting TCC solenoid valve circuit may be caused by a fault in other circuits spliced to TCC solenoid valve circuit.
  14. Check for open in TCC solenoid valve ignition feed circuit. Repair as necessary. After repairs, go to step  20.
  15. Check TCC 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  20. If circuit is okay, go to step  19.
  16. Check TCC 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  20. If circuit is okay, go to step  19.
  17. Replace transmission wiring harness assembly. See appropriate AUTOMATIC article in TRANSMISSION SERVICING. After repairs, go to step  20.
  18. Replace TCC solenoid valve. See appropriate AUTOMATIC article in TRANSMISSION SERVICING. After repairs, go to step  20.
  19. Replace PCM. After replacement, program PCM. See appropriate REMOVAL, OVERHAUL & INSTALLATION article in ENGINE PERFORMANCE. After repairs, go to next step.
  20. Using scan tool, clear DTCs. Test drive vehicle in "D4" range with TCC on. Ensure voltage feedback decreases to zero volts when TCC solenoid valve is commanded on, and voltage increases to battery voltage when commanded off. Conditions must be met for 5 seconds. Check for DTCs. If DTC P1860 does not return, system is okay. If DTC P1860 returns, go to step  1.
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