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P0944-LOSS OF HYDRAULIC PUMP PRIME For a complete wiring diagram Refer to Section 8W • When Monitored: • Set Condition: Possible Causes SHIFT LEVER OUT OF ADJUSTMENT IMPROPER FLUID LEVEL CRACKED OR IMPROPERLY INSTALLED PRIMARY OIL FILTER OR SEAL LOOSE COOLER RETURN FILTER STUCK OR STICKING MAIN REGULATOR VALVE TRANSMISSION OIL PUMP Always perform the 45RFE/545RFE Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to Theory of Operation The Loss of prime test is used to prevent transmission defaults and erroneous fault codes during temporary loss of The Loss of Prime DTC is set by a loss of hydraulic pressure in the transmission system. This condition, if sus- Diagnostic Test 1. SHIFT LEVER POSITION TEST Using the scan tool, perform a Shift Lever Position test. Follow the instructions on the scan tool. Did the Shift Lever Position Test pass? Yes >> Go To 2 No >> Refer to the Transmission category and perform the appropriate symptom. 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 21 - 620 AUTOMATIC TRANSMISSION 545RFE - ELECTRICAL DIAGNOSTICS - (DIESEL) KJ |