Chapter 1: Electronic Circuit Matrix Chart
PROBLEM SYMPTOMS TABLE - AUTOMATIC TRANSMISSION (ELECTRONIC CIRCUITS)
| Symptom |
Suspect Area |
| No up-shift (A particular gear, from 1st to 3rd gear, is not up-shifted) |
ECM |
| No up-shift (3rd → O/D) |
- O/D main switch circuit
- Electronically controlled transmission communication circuit
- O/D cancel signal circuit
- ECM
|
| No down-shift (O/D → 3rd) |
- O/D main switch circuit
- Electronically controlled transmission communication circuit
- O/D cancel signal circuit
- ECM
|
| No down-shift (A particular gear, from 3rd to 1st gear, is not down-shifted) |
ECM |
| No lock-up or No lock-up off |
ECM |
| Shift point too high or too low |
ECM |
| Upshift to 2nd while in L position |
ECM |
| Up-shift to 3rd while in 2 position |
ECM |
| Up-shift to O/D from 3rd while O/D main switch is OFF |
- O/D main switch circuit
- Electronically controlled transmission communication circuit
- O/D cancel signal circuit
- ECM
|
| Up-shift to O/D from 3rd while engine is cold |
ECM |
| Harsh engagement (N → D) |
ECM |
| Harsh engagement (Lock-up) |
ECM |
| Harsh engagement (Any driving position) |
ECM |
| Poor acceleration |
ECM |
| No kick-down |
ECM |
| Engine stalls when starting off or stopping |
ECM |
| Malfunction in shifting |
- Park/neutral position switch circuit
- ECM
|