Cause and Effect

SERVICE POINTS

OUTLINE
TRANSAXLE RANGE (TR) SWITCH
- If a malfunction occurs in the wiring of the TR or TR switch, the powertrain control module (PCM) cannot determine the range position, and shifting may be abnormal in D, 2, and 1 ranges. There may not be a shift to fourth gear, and all shifts will be firm.

TRANSAXLE FLUID TEMPERATURE (TFT) SENSOR
- If a malfunction occurs in the TFT sensor, the problem will be the torque converter clutch operation and EPC pressure control.

BRAKE SWITCH
- If the brake switch is always ON, the torque converter clutch will not engage at less than 1/3 throttle.
- If the brake switch is always OFF, the torque converter clutch will not disengage when the brake is applied.

TURBINE SHAFT SPEED SENSOR (TSS)
- If a malfunction occurs in the TSS, the torque converter clutch will not engage, and shifting may be harsh. There may not be a shift to fourth gear and engine braking way operate in second and third gear.

VEHICLE SPEEDOMETER SENSOR
- If a malfunction occurs in the vehicle speedometer sensor, shifting may be abnormal, the torque converter will not engage.
- There may not be all shift to fourth gear.

ELECTRONIC PRESSURE CONTROL (EPC) SOLENOID
- If the EPC is always ON, at maximum current line pressure will be at minimum.
- If the EPC is always OFF, the line pressure will be maximum and there will be harsh engagements or harsh shift.

Shift Solenoid No.1 and No.2 (SS1, SS2)
- If a malfunction occurs in the SS1 or SS2, shifting may be abnormal.

3-2 TIMING/COASTING CLUTCH SOLENOID (3-2T/CCS)
- If the 32T/CCS is always ON, the engine braking will not operate (except in fourth gear) and will delay 32, 4-2 downshifts.
- If the 32T/CCS is always OFF, the engine braking will operate in second/third gear (D range) and abnormal 32 downshifts and harsh 4-3 downshift.

TORQUE CONVERTER CLUTCH (TCC) SOLENOID
- If the TCC is always ON, the torque converter clutch will not disengage.
- If the TCC is always OFF, the torque converter clutch will not engage.

ENGINE COOLANT TEMPERATURE (ECT) SENSOR
- If a malfunction occurs in the ECT, the TCC will always be OFF.

DISTRIBUTOR IGNITION (DI) SYSTEM
- If a malfunction occurs in the DI, the torque converter clutch will not engage, and shifting may be abnormal.

MAGNETIC CLUTCH
- If the magnetic clutch is always ON, the line pressure will be slightly low with the A/C OFF.
- If the magnetic clutch is always OFF, the line pressure will be slightly high with the A/C ON.

MASS AIR FLOW SENSOR (MAF)
- If a malfunction occurs in the MAF, shifting and torque converter clutch operation will be abnormal.

THROTTLE POSITION SENSOR (TPS)
- If a malfunction occurs in the TPS, shifting and torque converter clutch operation will be abnormal.