Inspection Procedure

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.

HINT:

When using the intelligent tester, start from 1. When not using the intelligent tester, start from 2.

PERFORM ACTIVE TEST BY INTELLIGENT TESTER (AHC MOTOR RELAY)
1. Connect the intelligent tester to the DLC3.
2. Turn the ignition switch ON and push the intelligent tester main switch ON.
3. Select the ACTIVE TEST mode on the intelligent tester.
4. Check that the operation sound of the AHC motor relay when operating it with the intelligent tester.
  OK:
  
  The operation sound of the AHC motor relay should be heard.
NG: Go to step 3

OK: REPLACE SUSPENSION CONTROL ECU
CHECK SUSPENSION CONTROL ECU
1. Using SST, connect terminals 12 (TS) and 4 (CG) of the DLC3.
  SST 09843-18040
2. Push the DOWN button of the height select switch 5 times or more within 5 seconds after starting the engine.
  HINT:
  
  At this time the height control OFF indicator light flashes at 0.25 second intervals.
3. Change the damping mode select switch to the SPORT 2 position.
4. Push the UP button of the height select switch, then check the operation sound of the AHC motor relay.
  OK:
  
  The operation sound of the AHC motor relay should be heard.
OK: REPLACE SUSPENSION CONTROL ECU

NG: GO TO NEXT STEP

Fig 1: Checking Suspension Control ECU
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

CHECK WIRE HARNESS (ENGINE ROOM JUNCTION BLOCK (AHC MOTOR RELAY) - BODY GROUND)

Remove the AHC motor relay from the engine room junction block.

Measure the voltage between terminal 1 of the engine room junction block (for AHC motor relay) and body ground.

Standard voltage

TESTER CONNECTION SPECIFIED CONDITION

Tester Connection	Specified Condition
1 - Body ground	10 to 14 V

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR

Fig 2: Removing AHC Motor Relay From Engine Room Junction Block

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: GO TO NEXT STEP

INSPECT AHC MOTOR RELAY (Marking: AHC Relay)

Remove the AHC motor relay from the engine room junction block.

Measure the resistance of the relay.

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION

Tester Connection	Specified Condition
3 - 4	Reference value 62 Ω
1 - 2	10 kΩ or higher

Apply battery positive voltage between terminals 3 and 4.

Measure the resistance of the relay.

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION

Tester Connection	Specified Condition
1 - 2	Below 1 Ω

NG: REPLACE AHC MOTOR RELAY

Fig 3: Inspecting AHC Motor Relay

OK: GO TO NEXT STEP

CHECK WIRE HARNESS (SUSPENSION CONTROL ECU - AHC MOTOR RELAY AND AHC PUMP AND MOTOR)
NG: REPAIR OR REPLACE HARNESS AND CONNECTOR

OK: REPLACE SUSPENSION CONTROL ECU