| Last Modified: 11-29-2007 | 1.6 T | |
| Service Category: Suspension | Section: Suspension Control System | |
| Model Year: 2008 | Model: Sequoia | Doc ID: RM000001N9100DX |
| Title: SUSPENSION CONTROL: AIR SUSPENSION SYSTEM (w/ AVS): PROBLEM SYMPTOMS TABLE (2008 Sequoia) | ||
PROBLEM SYMPTOMS TABLE
HINT:
- Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.
- Inspect the fuses and relays related to this system before inspecting the suspected areas below.
- If the malfunction still exists even after checking and confirming that all the circuits are normal, replace the suspension control ECU.
Air Suspension System
|
Symptom |
Suspected Area |
See page |
|---|---|---|
|
Vehicle height control function does not operate. |
Air tube seized |
|
|
Power source circuit |
|
|
|
Height control off switch circuit |
|
|
|
Height control switch circuit |
|
|
|
Height control sensor circuit |
|
|
|
Leveling solenoid valve circuit |
|
|
|
Gate solenoid valve circuit |
|
|
|
Exhaust solenoid valve circuit |
|
|
|
AIR SUS relay circuit |
|
|
|
Height control compressor motor circuit |
|
|
|
CAN communication system |
|
|
|
Suspension control ECU |
|
|
|
Illuminated position of height control indicator light does not change by height control switch operation. |
Power source circuit |
|
|
Height control off switch circuit |
|
|
|
Height control switch circuit |
|
|
|
Height control sensor circuit |
|
|
|
Leveling solenoid valve circuit |
|
|
|
Gate solenoid valve circuit |
|
|
|
Exhaust solenoid valve circuit |
|
|
|
AIR SUS relay circuit |
|
|
|
Height control compressor motor circuit |
|
|
|
CAN communication system |
|
|
|
Suspension control ECU |
|
|
|
Hunting of vehicle height occurs. |
Air leakage (Height control cylinder assembly rear) |
|
|
Height control sensor circuit |
|
|
|
Suspension control ECU |
|
|
|
Vehicle height control operates, but vehicle height uneven. |
Air leakage |
|
|
Clogging of air tube |
|
|
|
Height control sensor assembly |
|
|
|
Height control sensor circuit |
|
|
|
Gate solenoid valve circuit |
|
|
|
Suspension control ECU |
|
|
|
Vehicle height control operates, but vehicle height high or low (Vehicle height in NORMAL mode differs from standard value). |
Height control sensor assembly |
|
|
Height control sensor circuit |
|
|
|
Suspension control ECU |
|
|
|
When vehicle height control adjusted, it stops at extremely high or low position. |
Height control sensor assembly |
|
|
Height control sensor circuit |
|
|
|
Suspension control ECU |
|
|
|
Height control manual indicator light condition abnormal. |
Power source circuit |
|
|
Height control off switch circuit |
|
|
|
CAN communication system |
|
|
|
Suspension control ECU |
|
|
|
Height control indicator light condition abnormal. |
Power source circuit |
|
|
CAN communication system |
|
|
|
Suspension control ECU |
|
|
|
DTC check cannot completed. |
Power source circuit |
|
|
CAN communication system |
|
|
|
TC and CG Terminal Circuit |
|
|
|
Suspension control ECU |
|
|
|
ECM |
- |
|
|
Input signal check (test mode) cannot completed. |
Power source circuit |
|
|
CAN communication system |
|
|
|
TS and CG Terminal Circuit |
|
|
|
Suspension control ECU |
|
|
|
Vehicle height extremely low when vehicle parked. |
Air leakage |
|
|
Height control cylinder assembly |
- |
|
|
Height control sensor assembly |
|
|
|
Leveling solenoid valve circuit |
|
|
|
Exhaust solenoid valve circuit |
|
|
|
Compressor motor continues to operate. |
Air leakage |
|
|
Air tube clogged |
|
|
|
Height control cylinder assembly |
- |
|
|
Height control sensor assembly |
|
|
|
Height control sensor circuit |
|
|
|
Leveling solenoid valve circuit |
|
|
|
Exhaust solenoid valve circuit |
|
|
|
AIR SUS relay circuit |
|
|
|
Height control compressor motor circuit |
|
|
|
Suspension control ECU |
|
|
|
Damping force control does not operate at all. |
Absorber control switch circuit |
|
|
Absorber control actuator circuit |
|
|
|
TS and CG Terminal Circuit |
|
|
|
Front shock absorber assembly |
- |
|
|
Rear shock absorber assembly |
- |
|
|
Suspension control ECU |
|
|
|