Problem Symptoms Table
If a normal code is displayed during the DTC check but the problem still occurs, check the circuits for each problem symptom in the order given in the table below and proceed to the relevant troubleshooting page.
HINT:
Inspect the "Fuse" and "Relay" before confirming the suspected area as shown in the charts below.
Inspect each malfunction circuit in numerical order for the corresponding symptom.
If the malfunction still exist even after checking and confirming that all the circuit are normal, replace the ECM.
DYNAMIC LASER CRUISE CONTROL SYSTEM
PROBLEM SYMPTOM TABLE
| Symptom | Suspected area | Proceed to |
|---|---|---|
| Main switch cannot be turned ON. (Cruise indicator light in combination meter does not come on.) | 1. Cruise control switch circuit | CRUISE CONTROL SWITCH CIRCUIT |
| 2. Cruise main indicator light circuit | CRUISE MAIN INDICATOR LIGHT CIRCUIT | |
| 3. ECM | TERMINALS OF ECU | |
| Vehicle speed setting cannot be done. (Although indicator light in combination meter comes on when the main switch is turned ON, it goes off when vehicle speed is set.) | 1. Cruise control switch circuit | CRUISE CONTROL SWITCH CIRCUIT |
| 2. ECM | TERMINALS OF ECU | |
| Setting cannot be done. (Indicator light in combination meter comes on when the main switch is turned ON and it remains ON while setting.) | 1. Cruise control switch circuit | CRUISE CONTROL SWITCH CIRCUIT |
| 2. Stop light switch circuit | STOP LIGHT SWITCH CIRCUIT | |
| 3. Park/Neutral position switch circuit | DTC P0705 TRANSMISSION RANGE SENSOR CIRCUIT MALFUNCTION (PRNDL INPUT) | |
| 4. Combination meter system | HOW TO PROCEED WITH TROUBLESHOOTING | |
| 5. ECM | TERMINALS OF ECU | |
| While the vehicle is driven 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 | VEHICLE SPEED SENSOR CIRCUIT | |
| 3. Stop light switch circuit | STOP LIGHT SWITCH CIRCUIT | |
| 4. Cruise main indicator light circuit | CRUISE MAIN INDICATOR LIGHT CIRCUIT | |
| 5. Park/Neutral position switch circuit | DTC P0705 TRANSMISSION RANGE SENSOR CIRCUIT MALFUNCTION (PRNDL INPUT) | |
| 6. ECM | TERMINALS OF ECU | |
| Hunting (Speed is not constant.) | 1. Vehicle speed sensor circuit | VEHICLE SPEED SENSOR CIRCUIT |
| 2. Malfunction in speedometer circuit | MALFUNCTION IN SPEEDOMETER CIRCUIT | |
| 3. Laser radar sensor circuit | DTC P1570 Radar Sensor Malfunction | |
| 4. Distance control ECU circuit | - | |
| 5. ECM | TERMINALS OF ECU | |
| Setting cannot be canceled. (When Coast, Acceleration, Resume, Set speed change and Control switch are operated.) | 1. Cruise control switch circuit | CRUISE CONTROL SWITCH CIRCUIT |
| 2. ECM | TERMINALS OF ECU | |
| Erroneous detection or lost sight of the vehicle ahead. | 1. Clean laser radar sensor | - |
| 2. Improper aiming of laser sensor beam axis | DTC P1572 Improper Aiming of Radar Sensor Beam Axis | |
| Alarm buzzer does not sound. | 1. Buzzer circuit | DTC P1575 Warning Buzzer Malfunction |
| 2. VSC system | SYSTEM DESCRIPTION | |
| 3. Laser radar sensor circuit | DTC P1570 Radar Sensor Malfunction | |
| 4. Distance control ECU | TERMINALS OF ECU | |
| 5. ECM | TERMINALS OF ECU | |
| Set distance cannot be changed. | 1. Combination meter system | HOW TO PROCEED WITH TROUBLESHOOTING |
| 2. Distance control switch | DISTANCE CONTROL SWITCH | |
| 3. ECM | TERMINALS OF ECU | |
| No display. | 1. Combination meter system | HOW TO PROCEED WITH TROUBLESHOOTING |
| 2. ECM | TERMINALS OF ECU | |
| No brake control (when decelerating) | 1. ABS solenoid circuit | SYSTEM DESCRIPTION |
| 2. VSC system | SYSTEM DESCRIPTION | |
| 3. Distance control ECU | TERMINALS OF ECU | |
| 4. VSC system | SYSTEM DESCRIPTION | |
| Constant speed mode cannot be ON. | 1. Cruise control switch circuit | CRUISE CONTROL SWITCH CIRCUIT |
| 2. ECM | TERMINALS OF ECU | |
| 3. Combination meter system | HOW TO PROCEED WITH TROUBLESHOOTING | |
| Vehicle speed setting cannot be canceled with wiper Lo/Hi. (Including automatic wiper) | 1. Rain sensor circuit | RAIN SENSOR CIRCUIT |
| 2. Wiper signal circuit | WIPER SIGNAL CIRCUIT | |
| 3. Distance control ECU | TERMINALS OF ECU | |
| 4. ECM | TERMINALS OF ECU | |
| Setting cannot be canceled in SNOW mode. | 1. Pattern select switch circuit | PATTERN SELECT SWITCH CIRCUIT |
| 2. Automatic transmission system | SYSTEM DESCRIPTION | |
| 3. ECM | TERMINALS OF ECU | |
| Unable to adjust (complete) the optical axis of the laser radar sensor. | 1. Check for DTC P1570/73 | DTC P1570 Radar Sensor Malfunction |
| 2. Check the position, distance and angle of the reflector | REMOVAL | |
| 3. Check the installation of the laser radar sensor | INSTALLATION | |
| 4. Laser radar sensor | TERMINALS OF ECU | |
| 5. ECM | TERMINALS OF ECU |