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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 P1810: TFP Manual Valve Position Switch - Circuit 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. Check transmission fluid. Fill if necessary. See appropriate AUTOMATIC article in TRANSMISSION SERVICING. Go to next step.
  3. 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. Start engine and let idle at normal operating temperature. Apply brake pedal. While monitoring TFP switch A/B/C parameter on scan tool, shift transmission into each gear range. If actual gear range matches TFP switch A/B/C parameter on scan tool, see DIAGNOSTIC AIDS . If actual gear range does not match TFP switch parameter on scan tool, go to next step.
  4. Turn ignition off. Disconnect transmission 20-pin in-line harness connector. Turn ignition on, engine off. Using scan tool, monitor TFP switch A/B/C parameter. If scan tool indicates HI for all transmission range signal states, go to next step. If scan tool does not indicate HI for all transmission range signal states, go to step  9.
  5. Turn ignition off. Install appropriate jumper harness to engine side of transmission 20-pin in-line harness connector. Turn ignition on, engine off. Measure voltage between ground and terminals "N", "P" and "R" of jumper harness, one at a time. If battery voltage is present at each terminal, go to next step. If battery voltage is not present at each terminal, go to step  10.
  6. While monitoring TFP switch A/B/C parameter on scan tool, connect fused jumper wire between ground and terminal "N" (signal circuit "A") at jumper harness. If any other signal circuits on scan tool indicate LOW, go to step  11. If no other signal circuits on scan tool indicate LOW, go to next step.
  7. While monitoring TFP switch A/B/C parameter on scan tool, connect fused jumper wire between ground and terminal "R" (signal circuit "B") at jumper harness. If any other signal circuits on scan tool indicate LOW, go to step  11. If no other signal circuits on scan tool indicate LOW, go to next step.
  8. While monitoring TFP switch A/B/C parameter on scan tool, connect fused jumper wire between ground and terminal "P" (signal circuit "C") at jumper harness. If any other signal circuits on scan tool indicate LOW, go to step  11. If no other signal circuits on scan tool indicate LOW, go to step  12.
  9. Check TFP manual valve position switch signal circuits which did not indicate HI for short to ground between transmission 20-pin in-line harness connector and PCM. Repair as necessary. After repairs, go to step  16. If circuits are okay, go to step  15.
  10. Check TFP manual valve position switch signal circuits which did not indicate battery voltage for open between transmission 20-pin in-line harness connector and PCM. Repair as necessary. After repairs, go to step  16. If circuits are okay, go to step  15.
  11. Check TFP manual valve position switch signal circuits for short together between transmission 20-pin in-line harness connector and PCM. Repair as necessary. After repairs, go to step  16. If circuits are okay, go to step  15.
  12. Check TFP manual valve position switch signal circuits for open or short between transmission 20-pin in-line harness connector and TFP manual valve position switch. If any circuits are faulty, go to next step. If circuits are okay, go to step  14.
  13. Replace transmission wiring harness assembly. See appropriate AUTOMATIC article in TRANSMISSION SERVICING. After repairs, go to step  16.
  14. Replace TFP manual valve position switch. See appropriate AUTOMATIC article in TRANSMISSION SERVICING. After repairs, go to step  16.
  15. Replace PCM. After replacement, program PCM. See appropriate REMOVAL, OVERHAUL & INSTALLATION article in ENGINE PERFORMANCE. After repairs, go to next step.
  16. Using scan tool, clear DTCs. Turn ignition on, engine off for at least 2 seconds. Start vehicle and idle for 5 seconds. Drive vehicle in "D4" range until TCC locks for 10 seconds. Continue to run engine for at least one minute from start up. Check for DTCs. If DTC P1810 does not return, system is okay. If DTC P1810 returns, go to step  1.
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