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Problem Symptoms Table

AIR SUSPENSION SYSTEM 

PROBLEM SYMPTOMS TABLE

Symptom Suspected area Proceed to
Vehicle height control function does not operate 1. Freezing of the air tube -
2. Power source circuit POWER SOURCE CIRCUIT 
3. Crankshaft position sensor circuit CRANKSHAFT POSITION SENSOR CIRCUIT 
4. Height control off switch circuit HEIGHT CONTROL OFF SWITCH CIRCUIT 
5. Height control switch circuit HEIGHT CONTROL SWITCH CIRCUIT 
6. Height control sensor circuit HEIGHT CONTROL SENSOR CIRCUIT 
7. Height control solenoid valve circuit HEIGHT CONTROL SOLENOID VALVE CIRCUIT 
8. Exhaust solenoid valve circuit EXHAUST SOLENOID VALVE CIRCUIT 
9. Air sus relay circuit AIR SUS RELAY CIRCUIT 
10. Height control compressor circuit HEIGHT CONTROL COMPRESSOR CIRCUIT 
11. Suspension control ECU SUSPENSION CONTROL ECU 
Height control indicator light does not switch to the correct position in accordance to height control switch operation 1. Power source circuit POWER SOURCE CIRCUIT 
2. Crankshaft position sensor circuit CRANKSHAFT POSITION SENSOR CIRCUIT 
3. Height control off switch circuit HEIGHT CONTROL OFF SWITCH CIRCUIT 
4. Height control switch circuit HEIGHT CONTROL SWITCH CIRCUIT 
5. Height control sensor circuit HEIGHT CONTROL SENSOR CIRCUIT 
6. Height control solenoid valve circuit HEIGHT CONTROL SOLENOID VALVE CIRCUIT 
7. Exhaust solenoid valve circuit EXHAUST SOLENOID VALVE CIRCUIT 
8. Air sus relay circuit AIR SUS RELAY CIRCUIT 
9. Height control compressor circuit HEIGHT CONTROL COMPRESSOR CIRCUIT 
10. Speed sensor circuit SPEED SENSOR CIRCUIT 
11. Suspension control ECU SUSPENSION CONTROL ECU 
Hunting of vehicle height occurs 1. Air leakage -
2. Height control sensor circuit HEIGHT CONTROL SENSOR CIRCUIT 
3. Suspension control ECU SUSPENSION CONTROL ECU 
Vehicle height control operates, but vehicle height is uneven 1. Air leakage -
2. Clogging of the Air tube -
3. Height control sensor link sub-assembly REMOVAL 
4. Height control sensor circuit HEIGHT CONTROL SENSOR CIRCUIT 
5. Height control solenoid valve circuit HEIGHT CONTROL SOLENOID VALVE CIRCUIT 
6. Suspension control ECU SUSPENSION CONTROL ECU 
Vehicle height control operates, but vehicle height is high or low. (Vehicle height in NORMAL mode differs from the standard value) 1. Height control sensor link sub-assembly REMOVAL 
2. Height control sensor circuit HEIGHT CONTROL SENSOR CIRCUIT 
3. Suspension control ECU SUSPENSION CONTROL ECU 
When vehicle height control is adjusted, but it stops at extremely high or extremely low position 1. Height control sensor circuit HEIGHT CONTROL SENSOR CIRCUIT 
2. Height control sensor link sub-assembly REMOVAL 
3. Suspension control ECU SUSPENSION CONTROL ECU 
Height control OFF indicator light condition is abnormal 1. Power source circuit POWER SOURCE CIRCUIT 
2. Height control off switch circuit HEIGHT CONTROL OFF SWITCH CIRCUIT 
3. Height control off indicator light circuit HEIGHT CONTROL OFF INDICATOR LIGHT CIRCUIT 
4. Suspension control ECU SUSPENSION CONTROL ECU 
Height control indicator light condition is abnormal 1. Power source circuit POWER SOURCE CIRCUIT 
2. Height control indicator light circuit HEIGHT CONTROL INDICATOR LIGHT CIRCUIT 
3. Suspension control ECU SUSPENSION CONTROL ECU 
Access mode indicator light condition is abnormal 1. Power source circuit POWER SOURCE CIRCUIT 
2. Suspension control ECU SUSPENSION CONTROL ECU 
DTC check cannot be completed 1. Power source circuit POWER SOURCE CIRCUIT 
2. TC Terminal circuit TC TERMINAL CIRCUIT 
3. Height control off indicator light circuit HEIGHT CONTROL OFF INDICATOR LIGHT CIRCUIT 
4. Suspension control ECU  
SUSPENSION CONTROL ECU 
Test mode cannot be completed 1. Power source circuit POWER SOURCE CIRCUIT 
2. TC terminal circuit TC TERMINAL CIRCUIT 
3. Suspension control ECU SUSPENSION CONTROL ECU 
Vehicle height is extremely low when vehicle is parked 1. Air leakage -
2. Height control cylinder assembly rear -
3. Height control sensor link sub-assembly REMOVAL 
4. TC Terminal circuit TC TERMINAL CIRCUIT 
5. Exhaust solenoid valve circuit EXHAUST SOLENOID VALVE CIRCUIT 
Compressor motor continues to operate 1. Air leakage -
2. Air tube clogged -
3. Pneumaitc cylinder assembly -
4. Height control sensor link sub-assembly REMOVAL 
5. TC Terminal circuit TC TERMINAL CIRCUIT 
6. Exhaust solenoid valve circuit EXHAUST SOLENOID VALVE CIRCUIT 
7. Tank solenoid valve circuit TANK SOLENOID VALVE CIRCUIT 
8. Air sus relay circuit AIR SUS RELAY CIRCUIT 
9. Height control compressor circuit HEIGHT CONTROL COMPRESSOR CIRCUIT 
10. Suspension control ECU SUSPENSION CONTROL ECU 
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