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P0783-3-4 SHIFT SOL, NO RPM DROP AT LOCKUP (GAS) (CONTINUED) 3. CHECK THE GOVERNOR AND OVERDRIVE PRESSURE Turn the ignition off to the lock position. Connect a 0 - 2068 KPa (0 - 300 PSI) pressure gauge to the Overdrive Clutch test port. Connect another 0 - 2068 KPa (0 - 300 PSI) pressure gauge to the Governor Pressure test port. (Refer to 21 - Start the engine and allow the transmission temperature to rise to normal operating temperature. CAUTION: Apply the parking brake. While observing the pressure gauges, with the scan tool, select 4th gear from the Gov and 3-4 Shift Valve Test. NOTE: The governor pressure should rise above 138 kPa (20 PSI). Shortly after the O/D pressure should Did the pressures act as previously described? Yes >> Go To 4 No >> Go To 5 4. CHECK THE TRANSMISSION OIL CONDITION Turn the ignition off to the lock position. Remove the transmission oil pan and inspect for excessive debris and burnt oil. Is the oil burnt or does the transmission oil pan contain excessive debris? Yes >> Repair the transmission as necessary. Refer to the Service Informtion for the proper repair procedures. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC - 48RE - DIAGNOSIS AND TESTING) Perform RE TRANSMISSION VERIFICATION TEST VER - 1 (GAS). (Refer to 21 - TRANSMISSION/ No >> Go To 6 5. CHECK THE GOVERNOR AND OVERDRIVE PRESSURE AFTER REPLACEMENT OF THE 3-4 SHIFT Turn the ignition off to the lock position. Replace the 3-4 Shift Solenoid per the Service Information. (Refer to 21 - TRANSMISSION/TRANSAXLE/AUTO- With the pressure gauges still attached, start the engine and allow the transmission temperature to rise to normal CAUTION: Apply the parking brake. While observing the pressure gauges, with the scan tool, select 4th gear from the Gov and 3-4 Shift Valve Test. NOTE: The governor pressure should rise to above 138 kPa (20 PSI). Shortly after the O/D pressure should Did the pressures act as previously described? Yes >> Test Complete. Perform RE TRANSMISSION VERIFICATION TEST VER - 1 (DIESEL). (Refer to 21 - TRANSMISSION/ No >> Overhaul the transmission per the Service Informtion. Pay attention to seals and clutches related to the OD clutch. Perform RE TRANSMISSION VERIFICATION TEST VER - 1 (GAS). (Refer to 21 - TRANSMISSION/ 21 - 752 AUTOMATIC TRANSMISSION - 48RE - GAS - ELECTRICAL DIAGNOSTICS DR/DH |