AUTOMATIC TRANSAXLE SYSTEM PROBLEM SYMPTOMS TABLE
Tech Tips
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If a normal code is displayed during the diagnostic trouble code check although the trouble still occurs, check the electrical circuits for each symptom in the order given in the charts on the following pages and proceed to the page given for troubleshooting.
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The Matrix Chart is divided into 2 chapters.
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When the circuit on which mark *1 is attached is a malfunction, DTC could be output.
Chapter 1:
Refer to the table below when the trouble cause is considered to be electrical. If the instruction PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE is given in the flowchart of each circuit, inspect the suspected areas in descending order for each symptom. If the trouble still occurs even though there are no abnormalities in the inspections listed for the symptoms, check and replace the ECM.
| Symptom | Suspected Area | See page |
|---|---|---|
| No up-shift (1st -> 2nd) | ECM | |
| No up-shift (2nd -> 3rd) | ECM | |
| No up-shift (3rd -> 4th) | Transmission control 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 | |
| Up-shift to 4th from 3rd while engine is cold | Engine coolant temp. sensor circuit *1 | |
| ECM | ||
| No gear change by shifting into "+" or "-" while the shifting lever is in the S position | Transmission control switch circuit | |
| ECM | ||
| Harsh engagement (N -> D) | ECM | |
| Harsh engagement (Lock-up) | ECM | |
| Harsh engagement (Any driving position) | ECM | |
| Poor acceleration | ECM | |
| Engine stalls when starting off or stopping | ECM | |
| Malfunction in shifting | Park/neutral position switch circuit *1 | |
| ECM |
| Symptom | Suspected Area | See page |
|---|---|---|
| Vehicle does not move in any forward positions and reverse positions | Manual valve | |
| Valve body assembly | ||
| Front and rear planetary gear | ||
| U/D planetary gear | ||
| U/D one-way clutch (F2) | ||
| Forward clutch (C1) | ||
| U/D brake (B3) | ||
| Vehicle does not move in R position | Front and rear planetary gear unit | |
| U/D planetary gear unit | ||
| Direct clutch (C2) | ||
| U/D brake (C3) | ||
| 1st and reverse brake (B2) | ||
| No up-shift (1st -> 2nd) | Valve body assembly | |
| No. 1 one-way clutch (F1) | ||
| 2nd brake (B1) | ||
| No up-shift (2nd -> 3rd) | Valve body assembly | |
| Direct clutch (C2) | ||
| No up-shift (3rd -> 4th) | Valve body assembly | |
| U/D clutch (C3) | ||
| No down-shift (4th -> 3rd) | Valve body assembly | |
| No down-shift (3rd -> 2nd) | Valve body assembly | |
| No down-shift (2nd -> 1st) | Valve body assembly | |
| No lock-up or No lock-up off | Valve body assembly | |
| Torque converter assembly | ||
| Harsh engagement (N -> D) | C1 accumulator | |
| Valve body assembly | ||
| Forward clutch (C1) | ||
| U/D one-way clutch (F2) | ||
| No. 1 one-way clutch (F1) | ||
| Harsh engagement (N -> R) | Valve body assembly | |
| Direct clutch (C2) | ||
| 1st and reverse brake (B2) | ||
| Harsh engagement (Lock-up) | Valve body assembly | |
| Torque converter assembly | ||
| 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 assembly | ||
| Forward clutch (C1) | ||
| Direct clutch (C2) | ||
| U/D brake (C3) | ||
| No. 1 one-way clutch (F1) | ||
| U/D one-way clutch (F2) | ||
| Slip or shudder (R position) | Oil strainer | |
| Direct clutch (C2) | ||
| 1st and reverse brake (B2) | ||
| Slip or shudder (1st) | No. 1 one-way clutch (F1) | |
| Slip or shudder (2nd) | U/D one-way clutch (F2) | |
| 2nd brake (B1) | ||
| Slip or shudder (3rd) | Direct clutch (C2) | |
| Slip or shudder (4th) | U/D clutch (C3) | |
| No engine braking (1st to 3rd: D position) | U/D brake (B3) | |
| No engine braking (1st: L position) | 1st and reverse brake (B2) | |
| No engine braking (2nd: 2 position) | 2nd brake (B1) | |
| Poor acceleration (All position) | Torque converter assembly | |
| U/D planetary gear | ||
| Poor acceleration (4th) | U/D clutch (C3) | |
| U/D planetary gear | ||
| Large shift shock or engine stalls when starting off or stopping | Torque converter assembly | |
| No kick-down | Valve body assembly |