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.
| Symptom | Suspected Area | See page |
|---|---|---|
| No up-shift (1st -> 2nd) | ECM | |
| No up-shift (2nd -> 3rd) | ECM | |
| No up-shift (3rd -> 4th) | Park/neutral position switch circuit | |
| ECM | ||
| No down-shift (4th -> 3rd) | Park/neutral position switch circuit | |
| ECM | ||
| No down-shift (3rd -> 2nd) | ECM | |
| No down-shift (2nd -> 1st) | ECM | |
| No lock-up or no lock-up off | Stop light switch circuit | |
| ECM | ||
| Shift point too high or too low | Park/neutral position switch circuit | |
| ECM | ||
| Up-shift to 4th from 3rd while engine is cold | ECM | |
| Poor acceleration | ECM | |
| No kick-down | ECM | |
| Engine stalls when starting off or stopping | Stop light switch circuit | |
| ECM |
| Symptom | Suspected Area | See page |
|---|---|---|
| Vehicle does not move when shift lever is in any forward position or reverse position | Transmission control cable | |
| Manual valve | ||
| Oil pump | ||
| Front clutch (C1) | ||
| Rear clutch (C2) | ||
| O/D one-way clutch (F0) | ||
| O/D direct clutch (C0) | ||
| O/D planetary gear unit | ||
| Torque converter | ||
| Vehicle does not move with shift lever in R | Reverse control valve | |
| O/D direct clutch (C0) | ||
| Rear clutch (C2) | ||
| 1st and reverse brake (B3) | ||
| Vehicle does not move when shift lever is in D, 2 and L | O/D direct clutch (C0) | |
| Front clutch (C1) | ||
| Vehicle does not move when shift lever is in D and 2 | Front clutch (C1) | |
| Vehicle does not move when shift lever is in 2 | 2nd brake (B2) | |
| Vehicle does not move when shift lever is in L | 1st and reverse brake (B3) | |
| No up-shift (1st -> 2nd) | 1-2 shift valve | |
| O/D direct clutch (C0) | ||
| 2nd brake (B2) | ||
| 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) | ||
| O/D direct clutch (C0) | ||
| O/D one-way clutch (F0) | ||
| 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 | |
| No. 1 one-way clutch (F1) | ||
| 1st and reverse brake (B3) | ||
| No lock-up or no lock-up off | Lock-up signal valve | |
| Lock-up control valve | ||
| Torque converter | ||
| Harsh engagement (N -> D) | Accumulator control valve | |
| C1 accumulator | ||
| Front clutch (C1) | ||
| No. 1 one-way clutch (F1) | ||
| Harsh engagement (lock-up) | Torque converter | |
| Harsh engagement (N -> R) | Accumulator control valve | |
| C2 accumulator | ||
| Rear clutch (C2) | ||
| 1st and reverse brake (B3) | ||
| Harsh engagement (N -> L) | Accumulator control valve | |
| C1 accumulator | ||
| C2 accumulator | ||
| Harsh engagement (1st -> 2nd/shift lever in D) | Accumulator control valve | |
| B1 accumulator | ||
| Harsh engagement (1st -> 2nd/shift lever in 2) | Accumulator control valve | |
| B2 accumulator | ||
| C1 accumulator | ||
| Harsh engagement (1st -> 2nd -> 3rd -> 4th) | Accumulator control valve | |
| Check ball | ||
| Throttle valve | ||
| Harsh engagement (2nd -> 3rd) | Accumulator control valve | |
| C2 accumulator | ||
| 2-3 shift timing valve | ||
| O/D direct clutch (C0) | ||
| Rear clutch (C2) | ||
| Harsh engagement (3rd -> 4th) | Accumulator control valve | |
| B0 accumulator | ||
| Check ball | ||
| O/D brake (B0) | ||
| Harsh engagement (4th -> 3rd) | Accumulator control valve | |
| B0 accumulator | ||
| O/D brake (B0) | ||
| O/D one-way clutch (F0) | ||
| Slip or shudder (forward and reverse, after warm-up) | Transmission control cable | |
| Oil strainer | ||
| Torque converter | ||
| O/D one-way clutch (F0) | ||
| O/D direct clutch (C0) | ||
| Slip or shudder (particular position, just after engine starts) | Transmission control cable | |
| Torque converter | ||
| Slip or shudder (shift lever in R) | 2nd brake (B2) | |
| Rear clutch (C2) | ||
| Slip or shudder (1st) | 1st and reverse brake (B3) | |
| No. 1 one-way clutch (F1) | ||
| Slip or shudder (2nd) | 2nd brake (B2) | |
| Front clutch (C1) | ||
| Slip or shudder (3rd) | Front clutch (C1) | |
| Rear clutch (C2) | ||
| Slip or shudder (4th) | O/D brake (B0) | |
| Front clutch (C1) | ||
| Rear clutch (C2) | ||
| No engine braking (1st, shift lever in L) | Low coast modulator valve | |
| Modulator valve | ||
| O/D direct clutch (C1) | ||
| No engine braking (2nd, shift lever in 2) | 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 | |
| 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 brake (B2) | |
| Poor acceleration (1st and 2nd) | Direct clutch (C2) | |
| Poor acceleration (shift lever in L or R) | 1st and reverse brake (B3) | |
| O/D brake (B0) | ||
| Rear clutch (C2) | ||
| Poor acceleration (shift lever in R) | Forward clutch (C1) | |
| Engine stalls when starting off or stopping | Torque converter |