On-Board Diagnostics System: Function
The on-board diagnostics system detects and stores in the form of a code a fault that has occurred in any of the following input and output signal systems.
ON-BOARD DIAGNOSTICS SYSTEM FUNCTION
| Rear vehicle speed sensor | Transfer duty solenoid | Low clutch timing solenoid |
|---|---|---|
| Front vehicle speed sensor | ATF temperature sensor | Torque converter turbine speed sensor |
| Throttle position sensor | Engine speed signal circuit | - |
| Shift solenoid 1 | Line pressure duty solenoid | - |
| Shift solenoid 2 | Intake manifold pressure signal circuit | - |
| 2-4 brake timing solenoid | Torque control signal circuit | - |
| Lock-up duty solenoid | 2-4 brake duty solenoid | - |
If a fault has been detected, the system tells the fault by causing the AT OIL TEMP warning light to operate as follows:
- Repeated flashing at 4 Hz frequency ...Errors such as battery trouble
- Repeated flashing at 2 Hz frequency ...No faults in the system
- Flashing at different intervals and frequencies ...Diagnostic trouble codes of corresponding faults
- Continued illumination of light ...Fault in inhibitor switch, idle switch, or wiring