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P0987-4C HYDRAULIC PRESSURE TEST (CONTINUED) 2. DTC P0770 PRESENT With the scan tool, check Transmission DTCs. Is the DTC P0770 also present? Yes >> Refer to the symptom list and perform diagnostics for P0770. No >> Go To 3 3. OTHER DTCS PRESENT With the scan tool, check for other transmission DTC’s Are the DTCs P0988 and/or P1736 present also? Yes >> Go To 12 No >> Go To 4 4. CHECK TO SEE IF DTC P0987 IS CURRENT With the scan tool, check if the DTC P0987-4C HYDRAULIC PRESSURE TEST FAILURE is active or stored. Is the DTC P0987-4C HYDRAULIC PRESSURE TEST FAILURE active? Yes >> Go To 5 No >> Go To 17 5. LINE PRESSURE STAYS THE SAME Start the engine. Warm the transmission to 82° C or 180° F. Firmly apply the brakes. With the scan tool, monitor the Line Pressure during the following step. Move the shift lever to each gear position, pausing momentarily in each position and record the line pressure read- Did the line pressure remain at a steady value between 585 and 655 kPa or 85 and 95 PSI in each posi- Yes >> Go To 6 No >> Go To 10 6. CHECK LINE PRESSURE SENSOR CONNECTION Ignition on, engine not running. With the scan tool, monitor the Line Pressure while firmly pushing the Transmission Line Pressure Sensor connector Did the Line Pressure reading on the scan tool change to about 207 kPa or 30 PSI when the connector Yes >> Disconnect and properly reconnect the Line Pressure Sensor connector. Inspect terminals and repair as necessary. Perform 45RFE/545RFE TRANSMISSION VERIFICATION TEST - VER 1. No >> Go To 7 HB AUTOMATIC TRANSMISSION 545RFE - ELECTRICAL DIAGNOSTICS 21 - 553 |