C1804

C1804 VHCL HEIGHT ADJ UP





DTC Logic

DTC DETECTION LOGIC






DTC CONFIRMATION PROCEDURE
1.PRECONDITIONING
If "DTC CONFIRMATION PROCEDURE" has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test.
- GO TO 2.
2.CHECK DTC DETECTION
With CONSULT-III
1. Set vehicle in the unloaded vehicle status.
2. Start the engine and wait 150 seconds or more.
3. Perform "Self Diagnostic Result" in "E-SUS".
Is "C1804" detected ?
YES - Go to SEE Diagnosis Procedure.
NO - INSPECTION END




Diagnosis Procedure
1.CHECK APPEARANCE
Visually check for malfunction of suspension components, damage of air chamber of rear shock absorber, installation malfunction, or deformation of vehicle height sensor.
Is the inspection result normal?
YES - GO TO 2.
NO - Repair or replace damaged parts.
2.CHECK AIR LEAK
Apply soapy water to air tube, connecting portions between air tube and each component, and air chamber of rear shock absorber. Check for air leakage.
Is the inspection result normal?
YES - GO TO 3.
NO - Repair or replace damaged parts.
3.CHECK AIR COMPRESSOR RELAY POWER SUPPLY
1. Turn ignition switch OFF.
2. Check 30A fuse (#I).
3. Disconnect air compressor relay connector.
4. Check voltage between air compressor relay harness connector and ground.





Is the inspection result normal?
YES - GO TO 4.
NO - Repair or replace damaged part.
4.CHECK AIR COMPRESSOR RELAY OUTPUT CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect air compressor connector.
3. Check continuity between air compressor relay harness connector and air compressor harness connector.





4. Check continuity between air compressor relay harness connector and ground.





Are the inspection results normal?
YES - GO TO 5.
NO - Repair or replace damaged part.
5.CHECK AIR COMPRESSOR GROUND
Check continuity between air compressor harness connector and ground.





Are the inspection results normal?
YES - GO TO 6.
NO - Repair or replace damaged part.
6.CHECK AIR COMPRESSOR RELAY
Check the air compressor relay. SEE Component Inspection (Air Compressor Relay).
Is the inspection result normal?
YES - GO TO 7.
NO - Replace the air compressor relay.
7.CHECK AIR COMPRESSOR
Check the air compressor. SEE Component Inspection (Air Compressor).
Is the inspection result normal?
YES - GO TO 8.
NO - Replace the air compressor. Removal And Installation.
8.CHECK INTERMITTENT INCIDENT
Intermittent Incident.
Is the inspection result normal?
YES - 1. Perform "STANDARD VEHICLE HEIGHT SETTING". Work Procedure.
2. If DTC is detected, replace the air levelizer control module. Removal And Installation.
NO - Repair or replace damaged part.




Component Inspection (Air Compressor Relay)
1.CHECK AIR COMPRESSOR RELAY
1. Remove the air compressor relay. Air Levelizer Control System.
2. Apply 12 V direct current between air compressor relay terminals 1 and 2.

CAUTION:
- Never make the terminals short.
- Connect the fuse between the terminals when applying the voltage.
3. Check continuity between air compressor relay terminals 3 and 5.





Is the inspection result normal?
YES - INSPECTION END
NO - Replace the air compressor relay. Air Levelizer Control System.




Component Inspection (Air Compressor)

CAUTION:
Keep the inside of air compressor free of dust.
1.CHECK AIR COMPRESSOR
1. Remove the air compressor. Removal And Installation.
2. Apply 12 V direct current between air compressor terminals 1 and 2.

CAUTION:
- Never make the terminals short.
- Connect the fuse between the terminals when applying the voltage.





Is the inspection result normal?
YES - INSPECTION END
NO - Replace the air compressor. Removal And Installation.