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Home >> Chrysler >> 2003 >> Intrepid ES, 3.5 V >> Repair and Diagnosis >> External Pages >> Different car >> Section 4 (Automatic Transmission Diagnosis) >> Diagnostic Tests >> DTC P1794: Speed Sensor Ground Error >> Diagnostic Procedure

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. Start engine. Using scan tool, monitor input and output speed sensor readings. If output speed sensor readings are twice that of input speed sensor, go to step  3. If output speed sensor readings are not twice that of input speed sensor, go to next step.
  2. 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, go to next step.
    3. NOTE: Failure to remove starter relay can cause a NO RESPONSE FROM TCM condition.
  3. 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. Turn rotary knob on transmission simulator to 1250/3000 position. Turn INPUT/OUTPUT switch on. Using scan tool, monitor input and output speed sensor readings. If input speed sensor reading is 2950-3050 RPM and output sensor reading is 1200-1300 RPM, test is complete. If speed sensor readings are not as specified, remove transmission simulator and go to next step.
  4. Turn ignition switch to LOCK position. Disconnect PCM harness connector C4. See Figure. Disconnect speed sensor harness connectors. Measure resistance of speed sensor ground circuit between speed sensor harness connector terminal No. 1 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 ground circuit. If resistance is 5 ohms or less, go to next step.
  5. If no other potential causes for DTC P1794 remain, PCM is assumed to be faulty. Repair or replace as necessary. See POWERTRAIN CONTROL MODULE  under REMOVAL & INSTALLATION.
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