Problem Symptoms Table

HINT:

If a normal system 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 information.
Inspect the fuse before inspecting the suspected areas as shown in the table below.
Inspect each malfunction circuit in numerical order for the corresponding symptom.
If the malfunction still exists even after checking and confirming that all the circuits are normal, replace the suspension control ECU.

HINT:

If a normal system 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 information.
Inspect the fuse before inspecting the suspected areas as shown in the table below.
Inspect each malfunction circuit in numerical order for the corresponding symptom.
If the malfunction still exists even after checking and confirming that all the circuits are normal, replace the suspension control ECU.

AIR SUSPENSION SYSTEM

PROBLEM SYMPTOMS TABLE

Symptom	Suspected Area	Information
Vehicle height control function does not operate.	Freezing of the air tube	-
	Power source circuit	DTC C1761/61: ECU MALFUNCTION
	Crankshaft position sensor circuit	DTC C1779/79, C1797/97: CRANKSHAFT POSITION SENSOR CIRCUIT
	Height control OFF switch circuit	DTC C1788/88: HEIGHT CONTROL OFF SWITCH CIRCUIT
	Height control switch circuit	DTC C1786/86: HEIGHT CONTROL SWITCH CIRCUIT
	Height control sensor circuit	DTC C1713/13, C1714/14: REAR HEIGHT CONTROL SENSOR RH CIRCUIT MALFUNCTION; REAR HEIGHT CONTROL SENSOR LH CIRCUIT MALFUNCTION
	Height control solenoid valve circuit	DTC C1733/33, C1734/34, C1735/35, C1744/44: REAR HEIGHT CONTROL GATE SOLENOID VALVE CIRCUIT MALFUNCTION; REAR HEIGHT CONTROL LEVELING SOLENOID VALVE CIRCUIT MALFUNCTION; EXHAUST SOLENOID VALVE CIRCUIT; TANK SOLENOID VALVE CIRCUIT
	Gate solenoid valve circuit	DTC C1733/33, C1734/34, C1735/35, C1744/44: REAR HEIGHT CONTROL GATE SOLENOID VALVE CIRCUIT MALFUNCTION; REAR HEIGHT CONTROL LEVELING SOLENOID VALVE CIRCUIT MALFUNCTION; EXHAUST SOLENOID VALVE CIRCUIT; TANK SOLENOID VALVE CIRCUIT
	Exhaust solenoid valve circuit	DTC C1733/33, C1734/34, C1735/35, C1744/44: REAR HEIGHT CONTROL GATE SOLENOID VALVE CIRCUIT MALFUNCTION; REAR HEIGHT CONTROL LEVELING SOLENOID VALVE CIRCUIT MALFUNCTION; EXHAUST SOLENOID VALVE CIRCUIT; TANK SOLENOID VALVE CIRCUIT
	AIR SUS relay circuit	DTC C1741/41: AIR SUSPENSION RELAY CIRCUIT
	Height control compressor circuit	DTC C1742/42: HEIGHT CONTROL COMPRESSOR CIRCUIT
	Suspension control ECU	-
Illuminated up position of height control indicator light does not change by height control switch operation.	Power source circuit	DTC C1774/74: POWER SOURCE CIRCUIT
	Crankshaft position sensor circuit	DTC C1779/79, C1797/97: CRANKSHAFT POSITION SENSOR CIRCUIT
	Height control OFF switch circuit	DTC C1788/88: HEIGHT CONTROL OFF SWITCH CIRCUIT
	Height control switch circuit	DTC C1786/86: HEIGHT CONTROL SWITCH CIRCUIT
	Height control sensor circuit	DTC C1733/33, C1734/34, C1735/35, C1744/44: REAR HEIGHT CONTROL GATE SOLENOID VALVE CIRCUIT MALFUNCTION; REAR HEIGHT CONTROL LEVELING SOLENOID VALVE CIRCUIT MALFUNCTION; EXHAUST SOLENOID VALVE CIRCUIT; TANK SOLENOID VALVE CIRCUIT
	Height control solenoid valve circuit	DTC C1733/33, C1734/34, C1735/35, C1744/44: REAR HEIGHT CONTROL GATE SOLENOID VALVE CIRCUIT MALFUNCTION; REAR HEIGHT CONTROL LEVELING SOLENOID VALVE CIRCUIT MALFUNCTION; EXHAUST SOLENOID VALVE CIRCUIT; TANK SOLENOID VALVE CIRCUIT
	Gate solenoid valve circuit	DTC C1733/33, C1734/34, C1735/35, C1744/44: REAR HEIGHT CONTROL GATE SOLENOID VALVE CIRCUIT MALFUNCTION; REAR HEIGHT CONTROL LEVELING SOLENOID VALVE CIRCUIT MALFUNCTION; EXHAUST SOLENOID VALVE CIRCUIT; TANK SOLENOID VALVE CIRCUIT
	Exhaust solenoid valve circuit	DTC C1733/33, C1734/34, C1735/35, C1744/44: REAR HEIGHT CONTROL GATE SOLENOID VALVE CIRCUIT MALFUNCTION; REAR HEIGHT CONTROL LEVELING SOLENOID VALVE CIRCUIT MALFUNCTION; EXHAUST SOLENOID VALVE CIRCUIT; TANK SOLENOID VALVE CIRCUIT
	AIR SUS relay circuit	DTC C1741/41: AIR SUSPENSION RELAY CIRCUIT
	Height control compressor circuit	DTC C1742/42: HEIGHT CONTROL COMPRESSOR CIRCUIT
	Speed sensor circuit	DTC C1776/76: SPEED SENSOR CIRCUIT
	Suspension control ECU	-
Hunting of vehicle height occurs.	Air leakage (Height control cylinder assembly rear)	ADJUSTMENT
	Height control sensor circuit	DTC C1713/13, C1714/14: REAR HEIGHT CONTROL SENSOR RH CIRCUIT MALFUNCTION; REAR HEIGHT CONTROL SENSOR LH CIRCUIT MALFUNCTION
	Suspension control ECU	-
Vehicle height control operates, but vehicle height is uneven.	Air leakage	ADJUSTMENT
	Clogging of air tube	-
	Height control sensor link sub-assembly	-
	Height control sensor circuit	DTC C1713/13, C1714/14: REAR HEIGHT CONTROL SENSOR RH CIRCUIT MALFUNCTION; REAR HEIGHT CONTROL SENSOR LH CIRCUIT MALFUNCTION
	Gate solenoid valve circuit	DTC C1733/33, C1734/34, C1735/35, C1744/44: REAR HEIGHT CONTROL GATE SOLENOID VALVE CIRCUIT MALFUNCTION; REAR HEIGHT CONTROL LEVELING SOLENOID VALVE CIRCUIT MALFUNCTION; EXHAUST SOLENOID VALVE CIRCUIT; TANK SOLENOID VALVE CIRCUIT
	Suspension control ECU	-
Vehicle height control operates, but vehicle height is height or low. (Vehicle height in NORMAL mode differs from standard value).	Height control sensor link sub-assembly	-
	Height control sensor circuit	DTC C1713/13, C1714/14: REAR HEIGHT CONTROL SENSOR RH CIRCUIT MALFUNCTION; REAR HEIGHT CONTROL SENSOR LH CIRCUIT MALFUNCTION
	Suspension control ECU	-
When vehicle height control is adjusted, it stops at extremely high or low position.	Height control sensor circuit	DTC C1713/13, C1714/14: REAR HEIGHT CONTROL SENSOR RH CIRCUIT MALFUNCTION; REAR HEIGHT CONTROL SENSOR LH CIRCUIT MALFUNCTION
	Height control sensor link sub-assembly	-
	Suspension control ECU	-
Height control OFF indicator light condition is abnormal.	Power source circuit	DTC C1761/61 ECU MALFUNCTION
	Height control OFF switch circuit	DTC C1788/88 HEIGHT CONTROL OFF SWITCH CIRCUIT
	Height control OFF indicator light circuit	HEIGHT CONTROL OFF INDICATOR LIGHT CIRCUIT
	Suspension control ECU	-
Height control indicator light condition is abnormal.	Power source circuit	DTC C1761/61 ECU MALFUNCTION
	Height control indicator light circuit	HEIGHT CONTROL INDICATOR LIGHT CIRCUIT
	Suspension control ECU	-
DTC check cannot be completed.	Power source circuit	DTC C1761/61 ECU MALFUNCTION
	TC terminal circuit	TC TERMINAL CIRCUIT
	Height control OFF indicator light circuit	HEIGHT CONTROL OFF INDICATOR LIGHT CIRCUIT
	Suspension control ECU	-
Input signal check (test mode) cannot be completed.	Power source circuit	DTC C1761/61 ECU MALFUNCTION
	TS terminal circuit	TS AND CG TERMINAL CIRCUIT
	Suspension control ECU	-
Vehicle height is extremely low when vehicle is parked. (*1)	Air leakage	ADJUSTMENT
	Height control cylinder assembly rear	-
	Height control sensor link sub-assembly	-
	Height control solenoid valve circuit	DTC C1733/33, C1734/34, C1735/35, C1744/44: REAR HEIGHT CONTROL GATE SOLENOID VALVE CIRCUIT MALFUNCTION; REAR HEIGHT CONTROL LEVELING SOLENOID VALVE CIRCUIT MALFUNCTION; EXHAUST SOLENOID VALVE CIRCUIT; TANK SOLENOID VALVE CIRCUIT
	Exhaust valve circuit	DTC C1733/33, C1734/34, C1735/35, C1744/44: REAR HEIGHT CONTROL GATE SOLENOID VALVE CIRCUIT MALFUNCTION; REAR HEIGHT CONTROL LEVELING SOLENOID VALVE CIRCUIT MALFUNCTION; EXHAUST SOLENOID VALVE CIRCUIT; TANK SOLENOID VALVE CIRCUIT
Compressor motor continues to operate. (*2)	Air leakage	ADJUSTMENT
	Air tube clogged	-
	Height control cylinder assembly rear	-
	Height control sensor link sub-assembly	-
	Height control solenoid valve circuit	DTC C1733/33, C1734/34, C1735/35, C1744/44: REAR HEIGHT CONTROL GATE SOLENOID VALVE CIRCUIT MALFUNCTION; REAR HEIGHT CONTROL LEVELING SOLENOID VALVE CIRCUIT MALFUNCTION; EXHAUST SOLENOID VALVE CIRCUIT; TANK SOLENOID VALVE CIRCUIT
	Exhaust valve circuit	DTC C1733/33, C1734/34, C1735/35, C1744/44: REAR HEIGHT CONTROL GATE SOLENOID VALVE CIRCUIT MALFUNCTION; REAR HEIGHT CONTROL LEVELING SOLENOID VALVE CIRCUIT MALFUNCTION; EXHAUST SOLENOID VALVE CIRCUIT; TANK SOLENOID VALVE CIRCUIT
	Tank solenoid valve circuit	-
	AIR SUS relay circuit	DTC C1741/41 AIR SUSPENSION RELAY CIRCUIT
	Height control compressor circuit	DTC C1742/42 HEIGHT CONTROL COMPRESSOR CIRCUIT
	Suspension control ECU	-
Damping force control does not operate at all	Absorber control actuator circuit	-
	TS terminal circuit	-
	Shock absorber	-
	Suspension control ECU	-
HINT: 1: Although, especially in a cold district, the vehicle height may become lower due to the air temperature drop in the height control cylinder assembly, that is not abnormal. 2: Due to the air tube freezing, vehicle may not rase all the time.