Component Tests and General Diagnostics

SLIPS IN ALL GEARS

1. Incorrect modulating pressure.
2. Faulty modulating pressure control valve.
3. Incorrect vacuum line routing or vacuum line disconnected.
4. Faulty valve body.
5. Faulty primary pump.

SLIPS IN 2ND GEAR OR SHIFTS FROM 1ST TO 3RD GEAR

1. Faulty valve body.
2. Damaged brake band B1 piston seal.
3. Damaged brake band B1 and/or B1 element.

SLIPS IN 1ST & 2ND GEAR

1. Faulty shift valve B2.
2. Faulty brake band B2 piston.
3. Incorrectly adjusted brake band B2.

SLIPS DURING 2ND/3RD SHIFT OR SLIPS, THEN GRABS HARD

1. Incorrect modulating pressure.
2. Temperature orifice not installed.
3. Damaged shift valve housing.
4. Damaged inner clutch K1 plates.

SLIPS DURING 3RD/4TH SHIFT

1. Incorrect modulating pressure.
2. Damaged shift valve housing.
3. Damaged inner clutch K2 plates.

AFTER INSTALLATION, TRANSAXLE HAS NO POWER

1. Incorrectly installed torque converter.
2. Damaged primary pump.
3. Damaged torque converter.

NO POWER FLOW IN ANY GEAR POSITION

1. Torque converter draining due to leaking and/or defective driveshaft lubricating ring.
2. Check or clean shift valve housing lubricating valve.

NO POWER FLOW IN REVERSE

1. Damaged brake band 3 lined plates and seals.
2. Damaged one-way clutch.

SHOCK WHEN ENGAGING DRIVE OR REVERSE

1. Incorrect idle speed and CO level.
2. Incorrect modulating pressure.
3. Missing shift valve housing check ball (5) spring.
4. Leaking or disconnect vacuum line.
5. Binding shift valve housing pressure acceptance piston.

SHOCK WHEN CHANGING GEARS

1. Incorrect modulating pressure.
2. Leaking or disconnected vacuum line.

SHOCK WHEN DOWNSHIFTING FROM 4TH TO 3RD

1. Damaged B2 release end seal.
2. Damaged B2 brake band piston.
3. Damaged B2 pressure element.

SHOCK WHEN SHIFTING IN PARTIAL LOAD RANGE

1. Incorrectly adjusted control pressure cable.
2. Incorrectly adjusted modulating pressure.
3. Leaking or disconnected vacuum line.

NO UPSHIFTS

1. Incorrect governor pressure.
2. Dirty centrifugal governor.
3. Dirty valve body housing.

NO KICKDOWN

1. No or insufficient power supply to solenoid valve.
2. Faulty solenoid valve.
3. Incorrectly adjusted or damaged control cable.
4. Damaged valve body.

NO BRAKE SHIFTS FROM 4TH TO 3RD & 3RD TO 2ND

1. Incorrectly adjusted control pressure cable.
2. Leaking or disconnected vacuum line.
3. Damaged brake shift piston.

POOR ACCELERATION

1. Incorrect stall speed.
2. Torque converter one-way clutch is slipping.

SELECTOR LEVER CANNOT BE ENGAGED IN REVERSE & PARK

1. Dirty centrifugal governor.
2. Restricted lower cover piston.

ENGINE CANNOT BE STARTED IN PARK & NEUTRAL

1. Incorrectly adjusted selector lever cable and starter interlock switch.
2. Damaged starter interlock switch.