Problem Symptoms Table
Be sure to perform the SYMPTOM SIMULATION procedure before replacing the ECM. If these symptoms do not persist, the cause of the problem may be a poor intermittent electrical contact (open or short) of a wire harness or connector.
Cruise control system:
PROBLEM SYMPTOM TABLE
| Symptom | Suspected Area | Reference |
|---|---|---|
| Main switch cannot be turned ON. (Cruise indicator light in combination meter is not lit.) | 1. Cruise control switch circuit | CRUISE CONTROL SWITCH CIRCUIT |
| 2. CRUISE MAIN indicator light circuit | CRUISE MAIN INDICATOR LIGHT CIRCUIT | |
| 3. ECM | REMOVAL | |
| Vehicle speed setting cannot be done. (Although indicator light in combination meter is lit when the main switch is turned ON, they go off when vehicle speed is set.) | 1. Cruise control switch circuit | CRUISE CONTROL SWITCH CIRCUIT |
| 2. ECM | REMOVAL | |
| Setting cannot be done. (Indicator light in combination meter is lit when the main switch is turned ON and they remain ON while setting.) | 1. Cruise control switch circuit | CRUISE CONTROL SWITCH CIRCUIT |
| 2. Stop light switch circuit | DTC P0571 BRAKE SWITCH "A" CIRCUIT | |
| 3. PNP switch circuit | DTC P0705 TRANSMISSION RANGE SENSOR CIRCUIT MALFUNCTION (PRNDL INPUT) | |
| 4. Combination meter system | HOW TO PROCEED WITH TROUBLESHOOTING | |
| 5. ECM | REMOVAL | |
| While the vehicle is driving with cruise control, the set control is canceled. (Indicator light and CRUISE remain ON.) | 1. Cruise control switch circuit | CRUISE CONTROL SWITCH CIRCUIT |
| 2. Vehicle speed sensor circuit | DTC P0500 VEHICLE SPEED SENSOR MALFUNCTION; DTC P0503 VEHICLE SPEED SENSOR "A" INTERMITTENT / ERRATIC / HIGH | |
| 3. Stop light switch circuit | DTC P0571 BRAKE SWITCH "A" CIRCUIT | |
| 4. CRUISE MAIN indicator light circuit | CRUISE MAIN INDICATOR LIGHT CIRCUIT | |
| 5. PNP switch circuit | DTC P0705 TRANSMISSION RANGE SENSOR CIRCUIT MALFUNCTION (PRNDL INPUT) | |
| 6. ECM | REMOVAL | |
| Hunting (Speed is not constant.) | 1. Vehicle speed sensor circuit | DTC P0571 BRAKE SWITCH "A" CIRCUIT |
| 2. ECM | REMOVAL | |
| Setting cannot be cancelled. (When Coast, Acceleration, Resume, Set speed change and Control switch are operated.) | 1. Cruise control switch circuit | CRUISE CONTROL SWITCH CIRCUIT |
| 2. ECM | REMOVAL | |
| DTC is not output, or is output when should not be. | 1. Diagnosis circuit | TC AND CG TERMINAL CIRCUIT |
| 2. ECM | REMOVAL | |
| CRUISE MAIN indicator light does not light up. | 1. Cruise control switch circuit | CRUISE CONTROL SWITCH CIRCUIT |
| 2. CRUISE MAIN indicator light circuit | CRUISE MAIN INDICATOR LIGHT CIRCUIT | |
| 3. ECM | REMOVAL |