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P0731-GEAR RATIO ERROR IN 1ST For a complete wiring diagram Refer to Section 8W. • When Monitored: • Set Condition: Possible Causes RELATED TRANSMISSION DTCS PRESENT INTERMITTENT GEAR RATIO ERRORS INTERNAL TRANSMISSION Always perform the 42RLE Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 21 - Theory of Operation The transmission system uses two speed sensors, one to measure input RPM and one to measure output RPM. Diagnostic Test 1. DETERMINING IF RELATED TRANSMISSION DTCS ARE PRESENT With the scan tool, read Transmission DTCs. If any of these DTCs are present, perform their respective tests first. Are there any Loss of Prime, Line Pressure Sensor and/or Speed Sensor DTCs present? Yes >> Refer to appropriate diagnostic procedure in the Transmission category. If any of these DTC’s are present, they will cause a gear ratio error. Perform the test for Loss of Prime first if it is present. No >> Go To 2 2. CHECK TO SEE IF P0731 IS CURRENT With the scan tool, perform the 1st gear clutch test. Follow the instructions on the scan tool. Increase the throttle angle or TPS Degree to 30° for no more than a few seconds. CAUTION: Do not overheat the transmission. Did the Clutch Test pass, Input Speed remain at zero? Yes >> Go To 3 No >> Repair internal Transmission as necessary. Check all of the components related to the UD and LR clutches. Inspect the Oil Pump and repair or replace as necessary. Refer to the Service Information for Perform 42RLE TRANSMISSION VERIFICATION TEST - VER 1. (Refer to 21 - TRANSMISSION/ 21 - 104 AUTOMATIC TRANSMISSION 42RLE - ELECTRICAL DIAGNOSTICS KJ |