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clutch slip is observed, the pressure control solenoid duty cycle is varied, increasing pressure in proportion to A high-travel torque converter damper assembly allows earlier torque converter clutch engagement to reduce slip- The hydraulic control system design (without electronic assist) provides the transmission with PARK, REVERSE, The TCM also performs certain self-diagnostic functions and provides comprehensive information (sensor data, T scan tool. DIAGNOSIS AND TESTING AUTOMATIC TRANSMISSION CAUTION: Before attempting any repair on a RFE automatic transmission, check for Diagnostic Trouble Transmission malfunctions may be caused by these general conditions: • Poor engine performance • Improper adjustments • Hydraulic malfunctions • Mechanical malfunctions • Electronic malfunctions Diagnosis of these problems should always begin by checking the easily accessible variables: fluid level and con- PRELIMINARY Two basic procedures are required. One procedure for vehicles that are drivable and an alternate procedure for VEHICLE IS DRIVABLE 1. Check for transmission fault codes using scan tool. 2. Check fluid level and condition. 3. Adjust gearshift cable if complaint was based on delayed, erratic, or harsh shifts. 4. Road test and note how transmission upshifts, downshifts, and engages. 5. Perform hydraulic pressure test if shift problems were noted during road test. 6. Perform air-pressure test to check clutch operation. 21 - 302 AUTOMATIC TRANSMISSION - 545RFE - SERVICE INFORMATION WK |