Problem Symptoms Table
HINT:
Use PROBLEM SYMPTOMS TABLE to help determine the cause of the problem symptom. The potential causes of the symptoms are listed in older of probability in the "Suspected area" column of the table. Check each symptom by checking the suspected areas in the order they are listed.
PROBLEM SYMPTOMS TABLE
| Symptom | Suspected area | Reference |
|---|---|---|
| Lifting up position of height control indicator light does not change according to operation of height control switch | 1. Check that the height control switch is not OFF. | - |
| 2. Check the DTC. | DTC CHECK/CLEAR | |
| 3. Perform the INPUT SIGNAL CHECK. | TEST MODE PROCEDURE | |
| Vehicle height control function does not operate | When the following 1. to 6. are all normal and the problem is still occurring, replace ECU. | - |
| 1. Check the power source circuit of the ECU. | POWER SOURCE CIRCUIT | |
| 2. Check if it is included in the inhibited conditions of the height control. (Rough road judgement, differential lock, etc.) | - | |
| 3. Check the indicator light. | HEIGHT CONTROL INDICATOR LIGHT CIRCUIT | |
| 4. Check the DTC. | DTC CHECK/CLEAR | |
| 5. Perform the HEIGHT CONTROL OPERATION TEST. | ON-VEHICLE INSPECTION | |
| 6. Perform the INPUT SIGNAL CHECK. | TEST MODE PROCEDURE | |
| Vehicle height control operates, but the vehicle height does not raise to N to HI position. | 1. Check that the loading weight does not exceed the predetermined value. | - |
| 2. Check if any heavy object such as a winch is installed. | - | |
| 3. Check for a shortage of the fluid. | - | |
| 4. Check the DTC. | DTC CHECK/CLEAR | |
| 5. Perform the INPUT SIGNAL CHECK. | TEST MODE PROCEDURE | |
| 6. Check the front and rear shock absorber fluid pressure. | ON-VEHICLE INSPECTION | |
| 7. Check the vehicle height. (Height control sensor link) | HEIGHT CONTROL SENSOR | |
| Vehicle height raises, but vehicle height does not go down to N to LO position | 1. Check that the vehicle weight is extremely light. | - |
| 2. Check if there is anything caught in the absorber and coil spring. | - | |
| 3. Check the DTC. | DTC CHECK/CLEAR | |
| 4. Perform the INPUT SIGNAL CHECK. | TEST MODE PROCEDURE | |
| 5. Check the front and rear shock absorber fluid pressure. | ON-VEHICLE INSPECTION | |
| 6. Check the vehicle height. (Height control sensor link) | HEIGHT CONTROL SENSOR | |
| Vehicle height is extremely low when vehicle is parked | HINT: Vehicle height may go down because of the atmosphere temperature change when vehicle is parked. | - |
| - | ||
| Check the fluid leakage of the gas chamber, shock absorber, etc. and if it is normal, replace the control valve assembly. | ON-VEHICLE INSPECTION | |
| Vehicle leans to the right or left. | 1. Check if the luggage is loaded with a slant. | - |
| 2. Check the DTC. | DTC CHECK/CLEAR | |
| 3. Adjust the vehicle height. | HEIGHT CONTROL SENSOR | |
| 4. Check the front and rear shock absorber fluid pressure. | ON-VEHICLE INSPECTION | |
| 5. Check the control valve assembly. (Front and rear gate valve) | DTC C1731/31, C1732/32, C1733/33, C1734/34, C1736/36: FRONT HEIGHT CONTROL GATE SOLENOID VALVE CIRCUIT MALFUNCTION; FRONT HEIGHT CONTROL LEVELING SOLENOID VALVE CIRCUIT MALFUNCTION; REAR HEIGHT CONTROL GATE SOLENOID VALVE CIRCUIT MALFUNCTION; REAR HEIGHT CONTROL LEVELING SOLENOID VALVE CIRCUIT MALFUNCTION; ACCUMULATOR SOLENOID VALVE CIRCUIT MALFUNCTION | |
| 6. Check fluid clog in the fluid line and shock absorber, etc. | - | |
| Vehicle height raise control requires a long time | HINT: Vehicle raise control may require a long time in case that the ambient temperature is -15 (5) or less or the accumulation pressure of the height control accumulator is not completed. | - |
| - | ||
| When the followings 1. to 6. are all normal and the problem is still occurring, replace the AHC pump motor. | - | |
| 1. Check that the loading weight does not exceed the predetermined value. | - | |
| 2. Check that the vehicle weight is extremely light. | - | |
| 3. Check the DTC. | DTC CHECK/CLEAR | |
| 4. Check the front and rear shock absorber fluid pressure. | ON-VEHICLE INSPECTION | |
| 5. Check the vehicle height. (Height control sensor link) | HEIGHT CONTROL SENSOR | |
| 6. Check that the fluid pressure of the height control accumulator is not lost. | - | |
| Vehicle height down control requires a long time | HINT: Vehicle height down control may require a long time in case that the ambient temperature is 15 (5) or less. | - |
| - | ||
| When the followings 1. to 3. are all normal and the problem is still occurring, replace the control valve assembly. | - | |
| 1. Check that the vehicle weight is extremely light. | - | |
| 2. Check the front and rear shock absorber fluid pressure. | ON-VEHICLE INSPECTION | |
| 3. Check the vehicle height. (Height control sensor link) | HEIGHT CONTROL SENSOR | |
| Vehicle leans to the front or rear. | When the followings 1. to 4. are all normal and the problem is still occurring, replace the control valve assembly. | - |
| 1. Check that the height control switch is not OFF. | - | |
| 2. Check fluid leakage. (Gas chamber, shock absorber, etc.) | ON-VEHICLE INSPECTION | |
| 3. Check the DTC. | DTC CHECK/CLEAR | |
| 4. Check the vehicle height. (Height control sensor link) | HEIGHT CONTROL SENSOR | |
| Vehicle goes down leaning. | When the followings 1. to 2. are all normal and the problem is still occurring, replace the control valve assembly. | - |
| 1. Check air leakage of the gas chamber. (Check the fluid level change of the reservoir tank.) | DAMAGING FORCE CONTROL ACTUATOR | |
| 2. Perform the DAMPING FORCE CONTROLLING CONDITION CHECK. | TEST MODE PROCEDURE | |
| Abnormal noise sounds from AHC system. | When the followings 1. to 2. are all normal and the problem is still occurring, replace the pump attenuator. | - |
| 1. Check interference of the fluid line. | - | |
| 2. Check interference of the AHC pump and motor. | - | |
| Vehicle ride is uncomfortable. | HINT: Vehicle ride may be uncomfortable soon after the starting when the ambient temperature is -10 (14) or less because the fluid viscosity is high. | - |
| - | ||
| When 1. to 7. are all normal and the problem is still occurring, replace the shock absorber. | - | |
| 1. Check the power source circuit of the ECU. | POWER SOURCE CIRCUIT | |
| 2. Check the DTC. | DTC CHECK/CLEAR | |
| 3. Perform the DAMPING FORCE CONTROLLING CONDITION CHECK. | TEST MODE PROCEDURE | |
| 4. Perform the INPUT SIGNAL CHECK | TEST MODE PROCEDURE | |
| 5. Check the resistance of the damping force control actuator. | DTC C1721/21, C1723/23: FRONT DAMPING FORCE CONTROL ACTUATOR CIRCUIT MALFUNCTION; REAR DAMPING FORCE CONTROL ACTUATOR CIRCUIT MALFUNCTION | |
| 6. Check air leakage of the gas chamber. (Check the fluid level change of the reservoir tank.) | DAMAGING FORCE CONTROL ACTUATOR | |
| 7. Check the front and rear chock absorber fluid pressure. | ON-VEHICLE INSPECTION | |
| Vehicle ride is too soft. | When 1. to 5. are all normal and the problem is still occurring, replace the damping force control actuator or shock absorber. | - |
| 1. Check the power source circuit of the ECU. | POWER SOURCE CIRCUIT | |
| 2. Check the DTC. | DTC CHECK/CLEAR | |
| 3. Perform the DAMPING FORCE CONTROLLING CONDITION CHECK. | TEST MODE PROCEDURE | |
| 4. Perform the INPUT SIGNAL CHECK. | TEST MODE PROCEDURE | |
| 5. Check the resistance of the damping force control actuator. | DTC C1721/21, C1723/23: FRONT DAMPING FORCE CONTROL ACTUATOR CIRCUIT MALFUNCTION; REAR DAMPING FORCE CONTROL ACTUATOR CIRCUIT MALFUNCTION | |
| Vehicle steering roll is different from right and left turn. | When 1. to 7. are all normal and the problem is still occurring, replace the damping force control actuator or shock absorber. | - |
| 1. Check if the luggage are loaded with a slant. | - | |
| 2. Check the power source circuit of the ECU. | POWER SOURCE CIRCUIT | |
| 3. Check the DTC. | DTC CHECK/CLEAR | |
| 4. Perform the DAMPING FORCE CONTROLLING CONDITION CHECK. | TEST MODE PROCEDURE | |
| 5. Perform the INPUT SIGNAL CHECK. | TEST MODE PROCEDURE | |
| 6. Check the resistance of the damping force control actuator. | DTC C1721/21, C1723/23: FRONT DAMPING FORCE CONTROL ACTUATOR CIRCUIT MALFUNCTION; REAR DAMPING FORCE CONTROL ACTUATOR CIRCUIT MALFUNCTION | |
| 7. Check air leakage of the gas chamber. (Check the fluid level change of the reservoir tank.) | DAMAGING FORCE CONTROL ACTUATOR | |
| Vehicle braking dive and starting squat are large. | When 1. to 5. are all normal and the problem is still occurring, replace the damping force control actuator or shock absorber. | - |
| 1. Check the power source circuit of the ECU. | POWER SOURCE CIRCUIT | |
| 2. Check the DTC. | DTC CHECK/CLEAR | |
| 3. Perform the DAMPING FORCE CONTROLLING CONDITION CHECK. | TEST MODE PROCEDURE | |
| 4. Perform the INPUT SIGNAL CHECK. | TEST MODE PROCEDURE | |
| 5. Check the resistance of the damping force control actuator. | DTC C1721/21, C1723/23: FRONT DAMPING FORCE CONTROL ACTUATOR CIRCUIT MALFUNCTION; REAR DAMPING FORCE CONTROL ACTUATOR CIRCUIT MALFUNCTION | |
| DTC check cannot be done. | 1. Check the height control OFF indicator circuit. | HEIGHT CONTROL OFF INDICATOR LIGHT CIRCUIT |
| 2. Check the TC terminal circuit. | TC AND CG TERMINAL CIRCUIT | |
| 3. Check the power source circuit of the ECU. | POWER SOURCE CIRCUIT | |
| INPUT SIGNAL CHECK cannot be done. | 1. Check the TS terminal circuit. | TS AND CG TERMINAL CIRCUIT |
| 2. Check the power source circuit of the ECU. | POWER SOURCE CIRCUIT |