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Symptom: P1794-SPEED SENSOR GROUND ERROR When Monitored and Set Condition: P1794-SPEED SENSOR GROUND ERROR When Monitored: The transmission gear ratio is monitored continuously while the transmission is in gear. Set Condition: After a TCM reset in neutral and Input/Output speed ratio equals a ratio of input to output of 2.5 to 1. POSSIBLE CAUSES SPEED SENSOR GROUND CIRCUIT OPEN TRANSMISSION CONTROL MODULE INTERMITTENT WIRING AND CONNECTORS TEST ACTION APPLICABILITY 1 NOTE: Low fluid level can be the cause of many Transmission problems. If t, read the engine DTC’s. Check and repair all engine DTC’s prior to performing Transmission Symptom Diagnostics. t, read Transmission DTC’s. Record all DTC’s and 1 Trip Failures. NOTE: Diagnose 1 Trip Failures as a fully matured DTC. All Continue 2 Start the engine in park. t, observe the Input and Output Speed Sensor readings. Is the Output Speed Sensor reading twice the Input Speed Sensor reading? All Yes → Go To 3 No → Go To 6 421 TRANSMISSION - 42RLE |