AUTOMATIC TRANSMISSION SYSTEM PROBLEM SYMPTOMS TABLE
Tech Tips
-
Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.
-
The Matrix Chart is divided into 2 chapters. When troubleshooting, check Chapter 1 first. If instructions are given in Chapter 1 to proceed to 2, proceed as instructed.
-
If the instruction "Proceed to Next Suspected Area Shown in Problem Symptoms Table" is given in the flowchart for a circuit, proceed to the next suspected area in the table.
-
If the problem still occurs even though there are no malfunctions in any of the circuits, check the ECM and replace it if necessary.
-
*: When the circuit is defective, a DTC may be stored.
| Symptom | Suspected Area | See page |
|---|---|---|
| No up-shift (1st -> 2nd) | Shift solenoid valve S2 circuit* | |
| Speed sensor SP2 circuit* | ||
| ECM | ||
| No up-shift (2nd -> 3rd) | Shift solenoid valve S1 circuit* | |
| ECM | ||
| No up-shift (3rd -> 4th) | Shift solenoid valve S2 circuit* | |
| Park/neutral position switch circuit* | ||
| Engine coolant temperature sensor circuit* | ||
| ECM | ||
| No down-shift (4th -> 3rd) | Shift solenoid valve S2 circuit* | |
| Park/neutral position switch circuit* | ||
| ECM | ||
| No down-shift (3rd -> 2nd) | Shift solenoid valve S1 circuit* | |
| ECM | ||
| No down-shift (2nd -> 1st) | Shift solenoid valve S2 circuit* | |
| ECM | ||
| No lock-up or no lock-up off | Shift solenoid valve SLU circuit* | |
| Stop light switch circuit* | ||
| Engine coolant temperature sensor circuit* | ||
| ECM | ||
| No lock-up | Shift solenoid valve SLU circuit* | |
| Engine coolant temperature sensor circuit* | ||
| Stop light switch circuit* | ||
| Speed sensor NCO circuit* | ||
| ECM | ||
| No lock-up off | Shift solenoid valve SLU circuit* | |
| ECM | ||
| Shift point too high or too low | Shift solenoid valve SLT circuit* | |
| Speed sensor NCO circuit* | ||
| Speed sensor SP2 circuit* | ||
| Throttle position sensor circuit* | ||
| No. 1 ATF temperature sensor circuit* | ||
| No. 2 ATF temperature sensor circuit* | ||
| ECM | ||
| Up-shift to 2nd while shift lever in L | Park/neutral position switch circuit* | |
| ECM | ||
| Up-shift to 3rd while shift lever in 2 | Park/neutral position switch circuit* | |
| ECM | ||
| Up-shift to 4th from 3rd while engine is cold | Engine coolant temperature sensor circuit* | |
| ECM | ||
| Harsh engagement (N -> D) | Shift solenoid valve SLT circuit* | |
| Speed sensor NCO circuit* | ||
| ECM | ||
| Harsh engagement (lock-up) | Shift solenoid valve SLU circuit* | |
| Speed sensor NCO circuit* | ||
| Speed sensor SP2 circuit* | ||
| ECM | ||
| Harsh engagement (any driving position) | Throttle position sensor circuit* | |
| Shift solenoid valve SLU circuit* | ||
| Shift solenoid valve SLT circuit* | ||
| Speed sensor NCO circuit* | ||
| ECM | ||
| Poor acceleration | Shift solenoid valve SLT circuit* | |
| Pattern select (2ND) switch circuit | ||
| ECM | ||
| No engine brake | ECM | |
| No kick-down | ECM | |
| Engine stalls when starting off or stopping | Shift solenoid valve SLU circuit* | |
| ECM | ||
| 2nd start does not operate | Shift solenoid valve SLT circuit* | |
| Pattern select (2ND) switch circuit | ||
| ECM |
| Symptom | Suspected Area | See page |
|---|---|---|
| Vehicle does not move when shift lever is in any forward position or reverse position | Shift solenoid valve SLT | |
| Transmission control cable | ||
| Manual valve | ||
| Parking lock pawl | ||
| O/D one-way clutch (F0) | ||
| O/D direct clutch (C0) | ||
| O/D brake (B0) | ||
| O/D planetary gear unit | ||
| Torque converter clutch | ||
| Vehicle does not move with shift lever in R | 2nd coast brake (B1) | |
| Front and rear planetary gear unit | ||
| Direct clutch (C2) | ||
| 1st and reverse brake (B3) | ||
| O/D direct clutch (C0) | ||
| No up-shift (1st -> 2nd) | 1-2 shift valve | |
| 2nd brake (B2) | ||
| No. 1 one-way clutch (F1) | ||
| No up-shift (2nd -> 3rd) | 2-3 shift valve | |
| Direct clutch (C2) | ||
| No up-shift (3rd -> 4th) | 3-4 shift valve | |
| O/D brake (B0) | ||
| No down-shift (4th -> 3rd) | 3-4 shift valve | |
| No down-shift (3rd -> 2nd) | 2-3 shift valve | |
| No down-shift (2nd -> 1st) | 1-2 shift valve | |
| 2nd coast brake (B1) | ||
| 2nd brake (B2) | ||
| No lock-up or no lock-up off | Lock-up control valve | |
| Lock-up relay valve | ||
| Torque converter clutch | ||
| Harsh engagement (N -> D) | Accumulator control valve | |
| Forward clutch (C1) | ||
| Harsh engagement (lock-up) | Lock-up control valve | |
| Lock-up relay valve | ||
| Torque converter clutch | ||
| Harsh engagement (N -> R) | Accumulator control valve | |
| C2 accumulator | ||
| Direct clutch (C2) | ||
| 1st and reverse brake (B3) | ||
| Harsh engagement (N -> L) | Low coast modulator valve | |
| Harsh engagement (1st -> 2nd -> 3rd -> 4th) | Accumulator control valve | |
| Throttle valve | ||
| Harsh engagement (2nd -> 3rd) | Accumulator control valve | |
| C2 accumulator | ||
| 2nd coast brake (B1) | ||
| Harsh engagement (3rd -> 4th) | Accumulator control valve | |
| Solenoid modulator valve | ||
| O/D direct clutch (C0) | ||
| O/D brake (B0) | ||
| O/D planetary gear unit | ||
| Harsh engagement (4th -> 3rd) | Accumulator control valve | |
| C0 accumulator | ||
| O/D brake (B0) | ||
| Slip or shudder (forward and reverse, after warm-up) | Shift solenoid valve SLT | |
| Transmission control cable | ||
| Oil strainer | ||
| Pressure relief valve | ||
| Torque converter clutch | ||
| O/D one-way clutch (F0) | ||
| O/D direct clutch (C0) | ||
| Slip or shudder (particular position, just after engine starts) | Shift solenoid valve SLT | |
| Transmission control cable | ||
| Torque converter clutch | ||
| Slip or shudder (shift lever in R) | Direct clutch (C2) | |
| 1st and reverse brake (B3) | ||
| Slip or shudder (1st) | Forward clutch (C1) | |
| No. 2 one-way clutch (F2) | ||
| Slip or shudder (2nd) | 2nd brake (B2) | |
| 2nd coast brake (B1) | ||
| No. 1 one-way clutch (F1) | ||
| Slip or shudder (3rd) | Direct clutch (C2) | |
| Slip or shudder (4th) | O/D brake (B0) | |
| No engine braking (1st, shift lever in L) | Low coast modulator valve | |
| 1st and reverse brake (B3) | ||
| No engine braking (2nd, shift lever in 2) | 2nd coast modulator valve | |
| 2nd coast brake (B1) | ||
| No engine braking (3rd, shift lever in 3) | O/D direct clutch (C0) | |
| No engine braking (1st to 4th, shift lever in D) | O/D direct clutch (C0) | |
| No kick-down | 1-2 shift valve | |
| 2-3 shift valve | ||
| 3-4 shift valve | ||
| Poor acceleration (all positions) | Torque converter clutch | |
| Poor acceleration (4th) | O/D direct clutch (C0) | |
| O/D planetary gear unit | ||
| Poor acceleration (other than 4th) | O/D brake (B0) | |
| Poor acceleration (other than 2nd) | 2nd coast brake (B1) | |
| 2nd brake (B2) | ||
| Poor acceleration (1st and 2nd) | Direct clutch (C2) | |
| Poor acceleration (shift lever in L or R) | 1st and reverse brake (B3) | |
| Poor acceleration (shift lever in R) | Forward clutch (C1) | |
| Engine stalls when starting off or stopping | Torque converter clutch |