Cruise Control System Symptom Diagnosis
Perform troubleshooting for each problem symptom, checking circuits involved in each symptom in the number order given below.
CRUISE CONTROL SYSTEM SYMPTOM DIAGNOSIS CHART
| Condition | Possible Cause | Action |
|---|---|---|
| "CRUISE" indicator lamp fails to light up or remains ON | "CRUISE" indicator lamp circuit faulty | Refer to "CRUISE" INDICATOR LAMP DOES NOT COME ON or "CRUISE" INDICATOR LAMP COMES ON STEADY . |
| Cruise control actuator assembly (with control module) power and ground circuits faulty | Refer to CRUISE CONTROL ACTUATOR ASSEMBLY (WITH CONTROL MODULE) POWER AND GROUND CIRCUITS CHECK . | |
| Cruise control actuator assembly (with control module) faulty | Replace cruise control actuator assembly (with control module). | |
| "SET" indicator lamp fails to light up or remains ON | "SET" indicator lamp circuit faulty | Refer to "SET" Indicator Lamp Does Not Come ON or "CRUISE" Indicator Lamp Comes ON Steady . |
| Cruise control module power and ground circuits faulty | Refer to CRUISE CONTROL ACTUATOR ASSEMBLY (WITH CONTROL MODULE) POWER AND GROUND CIRCUITS CHECK . | |
| Cruise control actuator assembly (with control module) faulty | Replace cruise control actuator assembly (with control module). | |
| Vehicle speed can not be set | Actuator cable play maladjusted or actuator cable faulty | Refer to CRUISE CONTROL CABLE PLAY INSPECTION AND ADJUSTMENT . |
| Cruise control switch assembly circuits faulty | Refer to CRUISE ON/OFF, SET/COAST, RES/ACC AND CANCEL SWITCHES CIRCUITS CHECK . | |
| VSS circuit faulty | Refer to VSS CIRCUIT CHECK . | |
| Brake light switch circuit faulty | Refer to BRAKE LIGHT SWITCH WITH PEDAL POSITION SWITCH CIRCUITS CHECK . | |
| Transmission range sensor (shift switch) circuit (A/T vehicle only) faulty | Refer to TRANSMISSION RANGE SENSOR (SHIFT SWITCH) CIRCUIT CHECK . | |
| Clutch pedal position switch circuit (M/T vehicle only) faulty | Refer to CLUTCH PEDAL POSITION (CPP) SWITCH CIRCUIT CHECK . | |
| Cruise control actuator assembly (with control module) power and ground circuits faulty | Refer to CRUISE CONTROL ACTUATOR ASSEMBLY (WITH CONTROL MODULE) POWER AND GROUND CIRCUITS CHECK . | |
| Cruise control actuator assembly (with control module) faulty | Replace cruise control actuator assembly (with control module). | |
| Vehicle set speed is unstable | Cruise control cable play maladjusted or actuator cable faulty | Refer to CRUISE CONTROL CABLE PLAY INSPECTION AND ADJUSTMENT . |
| VSS circuit faulty | Refer to VSS CIRCUIT CHECK . | |
| Throttle valve opening signal circuit (A/T vehicle only) faulty | Refer to THROTTLE VALVE OPENING SIGNAL CIRCUIT CHECK . | |
| Cruise control actuator assembly (with control module) faulty | Replace cruise control actuator assembly (with control module). | |
| Overdrive and TCC off command signal circuit faulty | Refer to OVERDRIVE AND TCC OFF COMMAND SIGNAL CIRCUIT CHECK . | |
| Actual vehicle speed deviates above or below set speed | Cruise control cable play maladjusted or actuator cable faulty | Refer to CRUISE CONTROL CABLE PLAY INSPECTION AND ADJUSTMENT . |
| Throttle valve opening signal circuit (A/T vehicle only) faulty | Refer to THROTTLE VALVE OPENING SIGNAL CIRCUIT CHECK . | |
| Cruise control actuator assembly (with control module) faulty | Replace cruise control actuator assembly (with control module). | |
| Overdrive and TCC off command signal circuit faulty | Refer to OVERDRIVE AND TCC OFF COMMAND SIGNAL CIRCUIT CHECK . | |
| Acceleration or deceleration by using "RES/ACC" or "SET/COAST" switch is not attained | Cruise ON/OFF circuits faulty | Refer to CRUISE ON/OFF, SET/COAST, RES/ACC AND CANCEL SWITCHES CIRCUITS CHECK . |
| Cruise control cable play maladjusted or actuator cable faulty | Refer to CRUISE CONTROL CABLE PLAY INSPECTION AND ADJUSTMENT . | |
| Cruise control actuator assembly (with control module) faulty | Replace cruise control actuator assembly (with control module). | |
| Cruise control is not cancelled even when "CANCEL" switch is operated | Cruise ON/OFF circuits faulty | Refer to CRUISE ON/OFF, SET/COAST, RES/ACC AND CANCEL SWITCHES CIRCUITS CHECK . |
| Cruise control actuator assembly (with control module) faulty | Replace cruise control actuator assembly (with control module). | |
| "RES/ACC" switch fails to resume preset vehicle speed after cruise control is cancelled | Cruise ON/OFF switch, "SET/COAST", "RES/ACC" and "CANCEL" switch circuits faulty | Refer to CRUISE ON/OFF, SET/COAST, RES/ACC AND CANCEL SWITCHES CIRCUITS CHECK . |
| Cruise control actuator assembly (with control module) faulty | Replace cruise control actuator assembly (with control module). | |
| Cruise control is not cancelled even when brake pedal is depressed | Brake light switch circuit faulty | Refer to BRAKE LIGHT SWITCH WITH PEDAL POSITION SWITCH CIRCUITS CHECK . |
| Cruise control actuator assembly (with control module) faulty | Replace cruise control actuator assembly (with control module). | |
| Cruise control is not cancelled even when clutch pedal is depressed | Clutch pedal position switch circuit (M/T vehicle only) faulty | Refer to CLUTCH PEDAL POSITION (CPP) SWITCH CIRCUIT CHECK . |
| Cruise control actuator assembly (with control module) faulty | Replace cruise control actuator assembly (with control module). | |
| Cruise control is not cancelled even when selector lever is shifted to "N" position | Transmission range sensor (shift switch) circuit (A/T vehicle only) faulty | Refer to TRANSMISSION RANGE SENSOR (SHIFT SWITCH) CIRCUIT CHECK . |
| Cruise control actuator assembly (with control module) faulty | Replace cruise control actuator assembly (with control module). | |
| Gear shifting between 4th and overdrive is frequent when driving on uphill road (Hunting) | Throttle valve opening signal circuit faulty | Refer to THROTTLE VALVE OPENING SIGNAL CIRCUIT CHECK . |
| Overdrive and TCC off command signal circuit faulty | Refer to OVERDRIVE AND TCC OFF COMMAND SIGNAL CIRCUIT CHECK . | |
| Cruise control actuator assembly (with control module) faulty | Replace cruise control actuator assembly (with control module). | |
| Gear is not shifted to overdrive gear even though not driving on uphill road | Throttle valve opening signal circuit faulty | Refer to THROTTLE VALVE OPENING SIGNAL CIRCUIT CHECK . |
| Overdrive and TCC off command signal circuit faulty | Refer to OVERDRIVE AND TCC OFF COMMAND SIGNAL CIRCUIT CHECK . | |
| Cruise control actuator assembly (with control module) faulty | Replace cruise control actuator assembly (with control module). |