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P0734-GEAR RATIO ERROR IN 4TH (CONTINUED) 5. CHECK LINE PRESSURE READING In the DTC EVENT DATA recorded earlier, is the line pressure reading more than 10 PSI below the desired Yes >> Remove the Transmission Oil pan and check the Transmission Oil filter for improper installation or plugged, if Primary oil filter is OK, check the main regulator valve in pump. If excessive debris is in the Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1. No >> Go To 6 6. CHECK TRANSMISSION FOR SLIPPAGE Erase DTCs and road test the vehicle. Check the transmission operation in reverse and all forward gears. During the road test, was there any obvious slippage noted in 4th gear or a runaway during the 3–4 shift? Yes >> Go To 8 No >> Go To 7 7. CHECK IF DTC RESET With the scan tool, check for Transmission DTCs after the road test. Did the DTC P0734 reset? Yes >> Go To 8 No >> Test Complete. 8. CHECK INTERNAL TRANSMISSION — Remove the Transmission Oil Pan and Valve Body per the Service Information and check for the following: — Excessive debris in the oil pan. — Remove the Valve Body and check if the accumulator cover is intact and the 4C tower seal is not cut or split. — OD and 4C accumulator pistons for cracks and/or cut seals. — Solenoid Switch Valve and its plugs for stickiness or wear. — Cut or missing #5 and/or #6 check ball. — OD bleed orifice on top of the Valve Body — Air check the OD and 4C hydraulic clutch circuits for excessive leakage. Refer to the Service information. NOTE: Both the OD and 4C hydraulic clutch circuits contain a small bleed orifice. A small amount of air Were there any problems found? Yes >> Repair as necessary. Refer to the Service Information for proper repair procedures. No >> Go To 9 HB AUTOMATIC TRANSMISSION 545RFE - ELECTRICAL DIAGNOSTICS 21 - 417 |