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Diagnostic Procedure

WARNING: This page is about a different car, the 2002 Dodge Intrepid, 2002 Chrysler Intrepid, 2002 Chrysler Concorde, and 2002 Chrysler 300M. However, it is still accessible from the selected car via links, so may be relevant.
  1. Using scan tool, check STARTS SINCE SET counter for DTC P1799. If counter is set at 2 or less, go to next step. If counter is not set at 2 or less, go to step  11.
    2. NOTE: Failure to remove starter relay can cause a NO RESPONSE FROM TCM condition.
  2. Turn ignition off. Remove starter relay from power distribution center. See Figure. This prevents vehicle from starting in gear. Install Transmission Simulator (8333). Turn ignition on. While monitoring thermistor voltage on scan tool, turn rotary knob on transmission simulator to all 3 positions. Using scan tool, compare readings in all 3 positions with readings on transmission simulator. If scan tool readings are always equal to simulator plus or minus .25 volt, go to step  8. If scan tool readings are always lower than simulator, go to step  9. If scan tool readings are always erratic compared to simulator, go to step  11. If scan tool readings are always higher than simulator, go to next step.
  3. Turn ignition switch to LOCK position. Disconnect PCM harness connector C4 and TR sensor harness connector. Measure resistance of transmission temperature sensor (speed sensor) ground circuit between TR sensor harness connector terminal No. 3 and PCM harness connector C4 terminal No. 34 using Miller Special Tool (8815). See WIRING DIAGRAMS . If resistance is greater than 5 ohms, repair open sensor ground circuit. If resistance is 5 ohms or less, go to next step.
  4. Measure resistance of transmission temperature sensor signal circuit between solenoid assembly harness connector terminal No. 4 and PCM harness connector C4 terminal No. 35 using Miller Special Tool (8815). If resistance is greater than 5 ohms, repair open signal circuit. If resistance is 5 ohms or less, go to next step.
  5. Disconnect input and output speed sensor connectors. Remove transmission control relay from power distribution center. See Figure. Using fused jumper wire, jumper fused B+ circuit and transmission control relay output circuit together at transmission control relay connector. See WIRING DIAGRAMS . Turn ignition on. Measure voltage between ground and transmission temperature sensor ground circuit at PCM harness connector C4 terminal No. 34 using Miller Special Tool (8815). If voltage is greater than .5 volt, repair circuit for short to voltage. If voltage is .5 volt or less, go to next step.
  6. Measure voltage between ground and transmission temperature sensor signal circuit at PCM harness connector C4 terminal No. 35 using Miller Special Tool (8815). If voltage is greater than .5 volt, repair circuit for short to voltage. If voltage is .5 volt or less, go to next step.
  7. If no other potential causes for DTC P1799 remain, PCM is assumed to be faulty. Repair or replace as necessary. See POWERTRAIN CONTROL MODULE  under REMOVAL & INSTALLATION.
    8. NOTE: Consult manufacturer's warranty documentation (if applicable) prior to performing repairs.
  8. If temperature readings are correct with transmission simulator installed, problem is internal. Replace solenoid assembly. See REMOVAL & INSTALLATION in appropriate SERVICING article in AUTOMATIC TRANSMISSIONS.
  9. Turn ignition switch to LOCK position. Disconnect PCM harness connector C4 and TR sensor harness connector. Measure resistance of transmission temperature sensor signal circuit between ground and PCM harness connector C4 terminal No. 35 using Miller Special Tool (8815). If resistance is less than 5 ohms, repair circuit for short to ground. If resistance is 5 ohms or greater, go to next step.
  10. If no other potential causes for DTC P1799 remain, PCM is assumed to be faulty. Repair or replace as necessary. See POWERTRAIN CONTROL MODULE  under REMOVAL & INSTALLATION.
  11. Conditions necessary to set DTC are not present at this time. Using wiring diagram as a guide, inspect wiring and connectors associated with circuits in question. See WIRING DIAGRAMS . Wiggle wires while checking for shorted and open circuits. Repair as necessary. If circuits are okay, testing is complete.
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