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: Description

WARNING: This page is about a different car, the 2007 Toyota Land Cruiser. However, it is still accessible from the selected car via links, so may be relevant.

The control valve solenoid assembly consists of each front and rear leveling valve and gate valve. It performs the height control and connecting and disconnecting the fluid line of the right and left shock absorber by operating the solenoid valve ON and OFF with the control signal from the ECU.

DTC DETECTION CONDITION TABLE

DTC No.	DTC Detection Condition	Trouble Area
C1731/31	When either of the following condition consisted 4 times continuously: When the condition that the B terminal voltage of ECU is more than 10 +/- 0.5 V and the lower reaches voltage of the solenoid while it is in non-operation condition is less than 20% of the B terminal voltage continued for 20 +/- 5 msec. When the condition that the B terminal voltage of ECU is more than 10 +/- 0.5 V and the lower reaches voltage of the solenoid while it is in operation condition is more than 80% of the B terminal voltage continued for 20 +/- 5 msec.	Front gate valve solenoid Suspension control ECU Wire harness
C1732/32	When either of the following condition consisted 4 times continuously: When the condition that the B terminal voltage of ECU is more than 10 +/- 0.5 V and the lower reaches voltage of the solenoid while it is in non-operation condition is less than 20% of the B terminal voltage continued for 20 +/- 5 msec. When the condition that the B terminal voltage of ECU is more than 10 +/- 0.5 V and the lower reaches voltage of the solenoid while it is in operation condition is more than 80% of the B terminal voltage continued for 20 +/- 5 msec.	Front leveling valve solenoid Suspension control ECU Wire harness
C1733/33	When either of the following condition consisted 4 times continuously: When the condition that the B terminal voltage of ECU is more than 10 +/- 0.5 V and the lower reaches voltage of the solenoid while it is in non-operation condition is less than 20% of the B terminal voltage continued for 20 +/- 5 msec. When the condition that the B terminal voltage of ECU is more than 10 +/- 0.5 V and the lower reaches voltage of the solenoid while it is in operation condition is more than 80% of the B terminal voltage continued for 20 +/- 5 msec.	Rear gate valve solenoid Suspension control ECU Wire harness
C1734/34	When either of the following condition consisted 4 times continuously: When the condition that the B terminal voltage of ECU is more than 10 +/- 0.5 V and the lower reaches voltage of the solenoid while it is in non-operation condition is less than 20% of the B terminal voltage continued for 20 +/- 5 msec. When the condition that the B terminal voltage of ECU is more than 10 +/- 0.5 V and the lower reaches voltage of the solenoid while it is in operation condition is more than 80% of the B terminal voltage continued for 20 +/- 5 msec.	Rear leveling valve solenoid Suspension control ECU Wire harness
C1736/36	When either of the following condition consisted 4 times continuously: When the condition that the B terminal voltage of ECU is more than 10 +/- 0.5 V and the lower reaches voltage of the solenoid while it is in non-operation condition is less than 20% of the B terminal voltage continued for 20 +/- 5 msec. When the condition that the B terminal voltage of ECU is more than 10 +/- 0.5 V and the lower reaches voltage of the solenoid while it is in operation condition is more than 80% of the B terminal voltage continued for 20 +/- 5 msec.	Height control accumulator solenoid Suspension control ECU Wire harness

HINT:

DTC C1731/31 corresponds to the front gate valve solenoid circuit.
DTC C1732/32 corresponds to the front leveling valve solenoid circuit.
DTC C1733/33 corresponds to the rear gate valve solenoid circuit.
DTC C1734/34 corresponds to the rear leveling valve solenoid circuit.
DTC C1736/36 corresponds to the height control accumulator solenoid circuit.

Fail-safe function:

If a trouble occurs in the control valve solenoid assembly circuit, the ECU prohibits the height control and fixed the damping force at the sports mode.