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 SYMPTOMS CHART
| Symptom | Suspected Area | See page |
|---|---|---|
| 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 | |
| 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 |