Inspection Procedure

HINT:

Proceed to troubleshooting following the flow chart, regardless of whether or not DTC C1733/33, C1734/34, C1735/35 or C1744/44 is displayed.
If DTC C1761/61 (ECU malfunction) and/or C1774/74 (power source circuit) is displayed, perform the inspection necessary for DTC C1761/61 ( DTC C1761/61 ECU MALFUNCTION ) and/or C1774/74 ( DTC C1774/74 POWER SOURCE CIRCUIT ) first.
(If DTC C1761/61 and C1774/74 are output at the same time, perform the inspection necessary for DTC C1774/74 first.)
Start the inspection from step 1 when using the hand-held tester, and start from step 2 when not using the hand-held tester
Since the exhaust solenoid valve cannot be tested in ACTIVE TEST, start the inspection from step 2.

PERFORM ACTIVE TEST BY HAND-HELD TESTER
1. Connect the hand-held tester to DLC3.
2. Turn the ignition switch ON, and push the hand-held tester main switch ON.
3. Select the item "LEVEL SOL REAR", "GATE SOL REAR", "LOW PRS TNK SOL" in the ACTIVE TEST, and operate it with the hand-held tester.
4. Check whether the solenoid makes sound.
5. Check whether the height control solenoid valve has a continuity (will vibrate).
Standard: The solenoid makes sound, and the height control solenoid valve has a continuity (will vibrate).
1. OK: CHECK AND REPLACE SUSPENSION CONTROL ECU (See ELECTRONIC CIRCUIT INSPECTION PROCEDURE )
2. NG: GO TO NEXT STEP.
INSPECT HEIGHT CONTROL SOLENOID VALVE OR EXHAUST SOLENOID VALVE
1. Disconnect the valve connector.
2. Measure resistance between terminals.
  Standard:
  
  Fig 1: Resistance Table
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  HINT:
  
  The height control solenoid valve has 2 connectors.
  - The gate solenoid valve and the leveling solenoid valve have a 3-pole connector.
  - Tank solenoid valve connector has a 2-pole connector.
3. Check the operating sound of the valves when battery positive voltage is applied to the terminals as shown below.
  
  Fig 2: Terminal Specification
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Standard: It should make an operating sound (click).

HINT:
- When a malfunction is found in the gate solenoid valve, the leveling valve or the tank solenoid valve, replace the height control reservoir assy.
- When a malfunction is found in the exhaust solenoid valve, replace the height control compressor assy.
  
  Fig 3: Inspecting Height Control Solenoid Valve Or Exhaust Solenoid Valve
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG: REPLACE HEIGHT CONTROL RESERVOIR ASSY
2. NG: REPLACE HEIGHT CONTROL COMPRESSOR ASSY
3. OK: GO TO NEXT STEP.
CHECK HARNESS AND CONNECTOR (HEIGHT CONTROL SOLENOID VALVE OR EXHAUST SOLENOID VALVE - SUSPENSION CONTROL ECU)
1. Check for open and short circuit in the harness and the connectors between height control solenoid valve or the exhaust solenoid valve and the suspension control ECU (See ELECTRONIC CIRCUIT INSPECTION PROCEDURE ).
1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
2. OK: GO TO NEXT STEP.
  CHECK AND REPLACE SUSPENSION CONTROL ECU (See ELECTRONIC CIRCUIT INSPECTION PROCEDURE )