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P1794-SPEED SENSOR GROUND ERROR (CONTINUED) For the Transmission circuit diagram (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - 42RLE - SCHE- For a complete wiring diagram Refer to Section 8W. • When Monitored: • Set Condition: Possible Causes SPEED SENSOR GROUND CIRCUIT OPEN POWERTRAIN CONTROL MODULE Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 21 - TRANSMIS- Theory of Operation The input and output speed sensors use a common ground circuit. The loss of this common ground results in the Diagnostic Test 1. PCM AND WIRING Turn the ignition off to the lock position. Remove the Starter Relay. CAUTION: Removal of the Starter Relay is to prevent a Transmission NO RESPONSE condition and to dis- Ignition on, engine not running. With the Transmission Simulator, set the 9 Input/Output Speed 9 switch to 9 ON 9 and the rotary switch to the 9 3000/ 1250 9 position. With the scan tool, monitor the Input and Output Speed Sensor readings. Does the Input Speed read 3000 RPM and the Output Speed read 1250 RPM, ± 50 RPM? Yes >> Go To 2 No >> Go To 4 21 - 228 AUTOMATIC TRANSMISSION 42RLE - ELECTRICAL DIAGNOSTICS ND |