Cruise Control System Symptom Diagnosis
CRUISE CONTROL SYSTEM SYMPTOM DIAGNOSIS
| Condition | Possible cause | Correction / Reference Item> |
|---|---|---|
| "CRUISE" indicator lamp fails to light up or remains ON |
|
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 |
|
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 |
|
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 ATT 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. |