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• failure to replace contaminated converter after repair The use of non recommended fluids can result in transmission failure. The usual results are erratic The dipstick cap and fill tube should be wiped clean before checking fluid level. Dirt, grease and Engine coolant in the transmission fluid is gener- ally caused by a cooler malfunction. The only remedy The transmission cooler and lines should be reverse flushed whenever a malfunction generates Failure to flush the cooler and lines will result in recontamination. Flushing applies to auxiliary cool- PRELIMINARY DIAGNOSIS Two basic procedures are required. One procedure for vehicles that are drivable and an alternate proce- VEHICLE IS DRIVEABLE (1) Check for transmission fault codes using DRB scan tool. (2) Check fluid level and condition. plaint was based on delayed, erratic, or harsh shifts. (4) Road test and note how transmission upshifts, downshifts, and engages. (5) Perform stall test if complaint is based on slug- gish acceleration. Or, if abnormal throttle opening is (6) Perform hydraulic pressure test if shift prob- lems were noted during road test. (7) Perform air-pressure test to check clutch-band operation. VEHICLE IS DISABLED (1) Check fluid level and condition. throttle linkage. (3) Check for cracked, leaking cooler lines, or loose or missing pressure-port plugs. (4) Raise and support vehicle on safety stands, start engine, shift transmission into gear, and note (a) If propeller shaft turns but wheels do not, problem is with differential or axle shafts. (b) If propeller shaft does not turn and transmis- sion is noisy, stop engine. Remove oil pan, and (c) If propeller shaft does not turn and transmis- sion is not noisy, perform hydraulic-pressure test to PARK/NEUTRAL POSITION SWITCH The center terminal of the park/neutral position switch is the starter-circuit terminal. It provides the SWITCH TEST To test the switch, remove the wiring connector. Test for continuity between the center terminal and Shift the transmission into REVERSE and test continuity at the switch outer terminals. Continuity Check gearshift linkage adjustment before replac- ing a switch that tests faulty. GEARSHIFT CABLE (1) The floor shifter lever and gate positions should be in alignment with all transmission PARK, (2) Engine starts must be possible with floor shift lever in PARK or NEUTRAL gate positions only. (3) With floor shift lever handle push-button not depressed and lever in: (a) PARK position—Apply forward force on cen- ter of handle and remove pressure. Engine starts 21 - 128 AUTOMATIC TRANSMISSION—30RH XJ DIAGNOSIS AND TESTING (Continued) |