Cruise Control System Symptom Diagnosis
DIAGNOSTIC INFORMATION AND PROCEDURES
| Condition | Possible Cause | Action |
|---|---|---|
| "CRUISE" indicator lamp fails to light up or remains ON | 1. "CRUISE" indicator lamp circuit faulty | Refer to "CRUISE" Indicator Lamp Circuit Check . |
| 2. Cruise control module power and ground circuits faulty | Refer to CRUISE CONTROL MODULE POWER AND GROUND CIRCUITS CHECK . | |
| 3. Actuator assembly faulty | Replace actuator assembly . | |
| "SET" indicator lamp fails to light up or remains ON | 1. "SET" indicator lamp circuit | Refer to "SET" Indicator Lamp Circuit Check |
| 2. Cruise control module power and ground circuits | Refer to CRUISE CONTROL MODULE POWER AND GROUND CIRCUITS CHECK . | |
| 3. Actuator assembly faulty | Replace actuator assembly . | |
| Vehicle speed can not be set | 1. Actuator cable play maladjusted or actuator cable faulty | Refer to CRUISE CABLE PLAY INSPECTION AND ADJUSTMENT . |
| 2. Cruise control lever circuits faulty | Refer to CRUISE ON/OFF, SET/COAST, RESUME/ACCEL AND CANCEL SWITCHES CIRCUITS CHECK . | |
| 3. VSS circuit faulty | Refer to VSS CIRCUIT CHECK . | |
| 4. Stop lamp switch circuit faulty | Refer to STOP LAMP SWITCH WITH PEDAL POSITION SWITCH CIRCUITS CHECK . | |
| 5. Transmission range sensor (shift switch) circuit (A/T vehicle only) faulty | Refer to TRANSMISSION RANGE SENSOR (SHIFT SWITCH) CIRCUIT CHECK . | |
| 6. Clutch pedal position switch circuit (M/T vehicle only) faulty | Refer to CLUTCH PEDAL POSITION (CPP) SWITCH CIRCUIT CHECK . | |
| 7. Cruise control module power and ground circuits faulty | Refer to CRUISE CONTROL MODULE POWER AND GROUND CIRCUITS CHECK . | |
| 8. Actuator assembly faulty | Replace actuator assembly . | |
| Vehicle set speed is unstable | 1. Actuator cable play maladjusted or actuator cable faulty | Refer to CRUISE CABLE PLAY INSPECTION AND ADJUSTMENT . |
| 2. VSS circuit faulty | Refer to VSS CIRCUIT CHECK . | |
| 3. Throttle valve opening signal circuit (A/T vehicle only) faulty | Refer to THROTTLE VALVE OPENING SIGNAL CIRCUIT CHECK . | |
| 4. Actuator assembly faulty | Replace actuator assembly . | |
| Actual vehicle speed deviates above or below set speed | 1. Actuator cable play maladjusted or actuator cable faulty | Refer to CRUISE CABLE PLAY INSPECTION AND ADJUSTMENT . |
| 2. Throttle valve opening signal circuit (A/T vehicle only) faulty | Refer to THROTTLE VALVE OPENING SIGNAL CIRCUIT CHECK . | |
| 3. Actuator assembly faulty | Replace actuator assembly . | |
| Acceleration or deceleration by using "RESUME/ACCEL" or "SET/COAST" switch is not attained | 1. Cruise ON/OFF circuits faulty | Refer to CRUISE ON/OFF, SET/COAST, RESUME/ACCEL AND CANCEL SWITCHES CIRCUITS CHECK . |
| 2. Actuator assembly faulty | Replace actuator assembly . | |
| Cruise control is not cancelled even when "CANCEL" switch is operated | 1. Cruise ON/OFF circuits faulty | Refer to CRUISE ON/OFF, SET/COAST, RESUME/ACCEL AND CANCEL SWITCHES CIRCUITS CHECK . |
| 2. Actuator assembly faulty | Replace actuator assembly . | |
| "RESUME/ACCEL" switch fails to resume preset vehicle speed after cruise control is cancelled | 1. Cruise ON/OFF switch, "SET/COAST", "RESUME/ACCEL" and "CANCEL" switch circuits faulty | Refer to CRUISE ON/OFF, SET/COAST, RESUME/ACCEL AND CANCEL SWITCHES CIRCUITS CHECK . |
| 2. Actuator assembly faulty | Replace actuator assembly . | |
| Cruise control is not cancelled even when brake pedal is depressed | 1. Stop lamp switch circuit faulty | Refer to STOP LAMP SWITCH WITH PEDAL POSITION SWITCH CIRCUITS CHECK . |
| 2. Actuator assembly faulty | Replace actuator assembly . | |
| Cruise control is not cancelled even when clutch pedal is depressed | 1. Clutch pedal position switch circuit faulty | Refer to CLUTCH PEDAL POSITION (CPP) SWITCH CIRCUIT CHECK . |
| 2. Actuator assembly faulty | Replace actuator assembly . | |
| Cruise control is not cancelled even when selector lever is shifted to "N" position | 1. Transmission range sensor (shift switch) circuit (A/T vehicle only) faulty | Refer to TRANSMISSION RANGE SENSOR (SHIFT SWITCH) CIRCUIT CHECK . |
| 2. Actuator assembly faulty | Replace actuator assembly . | |
| 4 speed A/T gear shifting is frequent between 3rd and overdrive when driving on uphill road (Hunting) | 1. Throttle valve opening signal circuit faulty | Refer to THROTTLE VALVE OPENING SIGNAL CIRCUIT CHECK . |
| 2. Overdrive and TCC off command signal circuit faulty | Refer to OVERDRIVE AND TCC OFF COMMAND SIGNAL CIRCUIT CHECK . | |
| 3. Actuator assembly faulty | Replace actuator assembly . | |
| 4 speed A/T is not shifted to overdrive gear even though not on uphill road | 1. Throttle valve opening signal circuit faulty | Refer to THROTTLE VALVE OPENING SIGNAL CIRCUIT CHECK . |
| 2. Overdrive and TCC off command signal circuit faulty | Refer to OVERDRIVE AND TCC OFF COMMAND SIGNAL CIRCUIT CHECK . | |
| 3. Actuator assembly faulty | Replace actuator assembly . |