Monitors, Trips, Drive Cycles and Readiness Codes

CAUTION: Before road testing a vehicle, be sure all components have been reassembled. During the test drive, do not try to read the scan tool while in motion. Do not hang scan tool from the rearview mirror or operate it by; yourself. Have an assistant available to operate the scan tool.

NOTE: Prior to performing a road test, be certain that the fluid level and condition, and control cable adjustment have been checked and approved.

NOTE: During the road test, the transaxle should be operated in each shift position to check for slipping and any variation in shifting.

PROPER OPERATION AT HIGHWAY SPEED POOR THROUGH GEAR ACCELERATION
If vehicle operates properly at highway speeds, but has poor through-gear acceleration, the torque converter stator overrunning clutch may be slipping. Stator defects require replacement of the torque converter.

PROPER THROUGH GEAR ACCELERATION POOR OPERATION AT HIGHWAY SPEED
If through-gear acceleration is normal, but abnormally high throttle opening is required to maintain highway speeds, the torque converter stator clutch may have seized. Stator defects require replacement of the torque converter.

SLIPPING CLUTCHES
In most cases, the clutch that is slipping can be determined by noting the transaxle operation in all selector positions. Then determining which internal units are applied in those positions. SEE Elements in Use Chart for road test analysis.

The process of elimination can be used to detect any unit which slips and to confirm proper operation of good units.

However, although road test analysis can usually diagnose slipping units, the actual cause of the malfunction usually can not be decided.


NOTE: Practically any condition can be caused by leaking hydraulic circuits or sticking valves