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 MAIN 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 main relay when operating it with the intelligent tester.
  OK:
  
  The operation sound of the AHC main relay should be heard.
NG: Go to step 4

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 turning the ignition switch ON.
  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 DOWN button of the height select switch, then check the operation sound of the AHC main relay.
  OK:
  
  The operation sound of the AHC main relay should be heard.
OK: Go to step 4

Fig 1: Identifying Terminals 12 (TS) & 4 (CG) Of DLC3
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: GO TO NEXT STEP

CHECK WIRE HARNESS (SUSPENSION CONTROL ECU - BODY GROUND)

Remove the suspension control ECU with connectors still connected.
Turn the ignition switch ON.

Measure the voltage between terminal MRLY of the suspension control ECU and body ground.

Standard voltage

TESTER CONNECTION SPECIFIED CONDITION

Tester Connection	Specified Condition
25 (MRLY) - Body ground	9 to 14 V

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR

Fig 2: Measuring Voltage Between Terminal MRLY Of Suspension Control ECU & Body Ground

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: GO TO NEXT STEP

INSPECT AHC MAIN RELAY (Marking: AHC Main Relay)

Disconnect the AHC main relay connector.
Remove the AHC main relay from the suspension control ECU.

Measure the resistance between each pair of terminal of the motor relay.

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION

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

Apply battery positive voltage between terminals 1 and 3.

Measure the resistance between terminals 2 and 4.

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION

Tester Connection	Specified Condition
2 - 4	Below 1 Ω

NG: REPLACE AHC MAIN RELAY

Fig 3: Inspecting AHC Main Relay

OK: GO TO NEXT STEP

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

OK: REPLACE SUSPENSION CONTROL ECU