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.
Inspect the fuses and relays related to this system before inspecting the suspected areas below.
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) | ECM | |
| No up-shift (2nd -> 3rd) | ECM | |
| No up-shift (3rd -> 4th) | Park/neutral position switch circuit* | |
| ECM | ||
| No down-shift (4th -> 3rd) | ECM | |
| No down-shift (3rd -> 2nd) | ECM | |
| No down-shift (2nd -> 1st) | ECM | |
| No lock-up or no lock-up off | ECM | |
| Shift point too high or too low | ECM | |
| No gear change by moving shift lever to "+" or "-" while shift lever is in S | Transmission control switch circuit | |
| ECM | ||
| Up-shift to 4th from 3rd while engine is cold | Engine coolant temperature sensor circuit* | |
| ECM | ||
| Harsh engagement (N -> D) | ECM | |
| Harsh engagement (lock-up) | ECM | |
| Harsh engagement (any gear position) | ECM | |
| Poor acceleration | ECM | |
| Engine stalls when starting off or stopping | ECM | |
| Malfunction in shifting | Park/neutral position switch circuit* | |
| ECM |
| Symptom | Suspected Area | See page |
|---|---|---|
| Vehicle does not move when shift lever is in any forward position or reverse position | Manual valve | |
| Primary regulator valve | ||
| Front and rear planetary gear | ||
| U/D planetary gear | ||
| F2 U/D one-way clutch | ||
| C1 forward clutch | ||
| B3 U/D brake | ||
| Vehicle does not move with shift lever in R | Front and rear planetary gear | |
| U/D planetary gear | ||
| C2 direct clutch | ||
| B3 U/D brake | ||
| B2 1st and reverse brake | ||
| No up-shift (1st -> 2nd) | Valve body assembly | |
| F1 No. 1 one-way clutch | ||
| B1 2nd brake | ||
| No up-shift (2nd -> 3rd) | Valve body assembly | |
| C2 direct clutch | ||
| No up-shift (3rd -> 4th) | 3-4 shift valve | |
| C3 U/D clutch | ||
| No down-shift (4th -> 3rd) | 3-4 shift valve | |
| No down-shift (3rd -> 2nd) | Valve body assembly | |
| No down-shift (2nd -> 1st) | Valve body assembly | |
| No lock-up or no lock-up off | Lock-up relay valve | |
| Torque converter clutch | ||
| Harsh engagement (N -> D) | C1 accumulator | |
| Valve body assembly | ||
| C1 forward clutch | ||
| F2 U/D one-way clutch | ||
| F1 No. 1 one-way clutch | ||
| Harsh engagement (N -> R) | Valve body assembly | |
| C2 direct clutch | ||
| B2 1st and reverse brake | ||
| Harsh engagement (Lock-up) | Lock-up relay valve | |
| Torque converter clutch | ||
| Harsh engagement (2nd -> 3rd) | Valve body assembly | |
| Harsh engagement (3rd -> 4th) | Valve body assembly | |
| Harsh engagement (4th -> 3rd) | Valve body assembly | |
| Slip or shudder (forward position, after warm-up) | Oil strainer | |
| Torque converter clutch | ||
| C1 forward clutch | ||
| C2 direct clutch | ||
| B3 U/D brake | ||
| F1 No. 1 one-way clutch | ||
| F2 U/D one-way clutch | ||
| Slip or shudder (shift lever in R) | Oil strainer | |
| C2 direct clutch | ||
| B2 1st and reverse brake | ||
| Slip or shudder (1st) | F1 No. 1 one-way clutch | |
| Slip or shudder (2nd) | F2 U/D one-way clutch | |
| B1 2nd brake | ||
| Slip or shudder (3rd) | C2 direct clutch | |
| Slip or shudder (4th) | C3 U/D clutch | |
| No engine braking (1st to 3rd/shift lever in D) | B3 U/D brake | |
| No engine braking (1st/S1 range) | B2 1st and reverse brake | |
| No engine braking (2nd/S2 range) | B1 2nd brake | |
| Poor acceleration (all positions) | Torque converter clutch | |
| U/D planetary gear | ||
| Poor acceleration (4th) | C3 U/D clutch | |
| U/D planetary gear | ||
| Large shift shock or engine stalls when starting off or stopping | Torque converter clutch | |
| No kick-down | Valve body assembly |