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P0944-LOSS OF HYDRAULIC PUMP PRIME (CONTINUED) 2. CHECK TO SEE IF DTC P0944 IS CURRENT Place the gear selector in Park. Start the engine. The transmission must be at operating temperature prior to checking pressure. A cold transmission will give higher Run the engine at 1500 RPM. With the scan tool, monitor the Transmission Line Pressure. Does the Line Pressure match the Desired Line Pressure within ± 5 psi? No >> Go To 6 Yes >> Go To 3 3. CHECK LINE PRESSURE IN DRIVE AND REVERSE Firmly apply the brake and repeat the previous test in both Drive and the Reverse gear positions. With the scan tool, monitor the Transmission Line Pressure. Does the Line Pressure match the Desired Line Pressure within ± 5 psi in all gear ranges? Yes >> Go To 4 No >> Go To 5 4. REVIEW CUSTOMER COMMENTS The conditions necessary to set this DTC are not present at this time. Verify with the customer if a delayed engagement and/or an intermittent 9 No Drive 9 condition has occurred. If the customers answer is 9 No 9 erase the DTC and return the vehicle to the customer. Make sure to check for any TSBs or controller flash updates that my apply. With the scan tool, check the EATX DTC EVENT DATA to help identify the conditions in which the DTC was set. Has the customer experienced any delayed engagement and/or ( No Drive ( conditions? Yes >> Repair internal transmission as necessary. Replace the Transmission Oil Pump if inspection reveals no signs of internal seal leakage. Refer to the Service Information for the proper repair procedure. Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1. No >> Test Complete. 5. DTC VERIFICATION Read and record the DTC and the EATX DTC EVENT DATA information. Test drive the vehicle and attempt to operate the vehicle within the parameters in which the DTC set. With the scan tool, read DTCs. Did any following DTCs set, P0868, P0944, P0841, P0846, P0871, P0876, or P0988? Yes >> Go To 6 No >> Test Complete. HB AUTOMATIC TRANSMISSION 545RFE - ELECTRICAL DIAGNOSTICS 21 - 549 |