Diesel Data: Automotive Repair

Excessive Shock or Engine Revs Up Abnormally High on All Upshifts and Downshifts (A/T)




Excessive shock or engine revs up abnormally high on all upshifts and downshifts

A/T clutch pressure control solenoid valve B defective

A/T clutch pressure control solenoid valve C defective

Input shaft (mainshaft) speed sensor defective

Output shaft (countershaft) speed sensor defective

ATF temperature sensor defective

Foreign material in separator plate orifice

Notes

Check for a stored DTC, and check for loose connections.

Notes

Test the solenoid valve function with the HDS.

Notes

Inspect the A/T clutch pressure control solenoid valve body gasket, ATF feed pipes, and O-rings for wear and damage.

Notes

Check the input shaft (mainshaft) speed sensor and output shaft (countershaft) speed sensor installation.

Notes

Inspect the sensor O-ring for wear and damage.

Notes

Check for a clogged orifice in the separator plate. If the orifice is clogged, remove it and clean the separator plate orifice.