Inspection Procedure

NOTE:

Before performing troubleshooting, inspect the connectors of related circuits.
If the suspension control ECU or height control sensor is replaced, the vehicle height offset calibration must be performed (See INITIALIZATION ).

READ VALUE USING TECHSTREAM (IG POWER SOURCE VOLTAGE)

Turn the engine switch off.
Connect the Techstream to the DLC3.
Turn the engine switch on (IG) and the Techstream on.
Enter the following menus: Chassis / AHC / Data List.
According to the display on the Techstream, read the Data List.

AHC

AHC REFERENCE

Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
IG Power Source Voltage	Power supply voltage / min.: 0 V max.: 255 V	Engine switch on (IG): 11 to 14 V	-

OK: 11 to 14 V

NG: Go to step 2

OK: CHECK INDICATOR CIRCUIT (See INDICATOR CIRCUIT )

INSPECT FUSE (ECU-IG NO. 4)

Remove the ECU-IG No. 4 fuse from the cowl side junction block RH.
Measure the resistance according to the value (s) in the table below.
Standard Resistance

STANDARD RESISTANCE

Tester Connection	Condition	Specified Condition
ECU-IG No. 4 fuse	Always	Below 1 Ω

NG: Go to step 7

OK: Go to next Step

INSPECT COWL SIDE JUNCTION BLOCK RH (IG NO. 4 RELAY)

Disconnect the K30 ECU connector.
Measure the voltage according to the value (s) in the table below.
Standard Voltage

STANDARD VOLTAGE

Tester Connection	Condition	Specified Condition
K30-5 (IG) - Body ground	Engine switch on (IG)	11 to 14 V

NG: Go to step 4

Fig 1: Identifying K30 ECU Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: REPLACE SUSPENSION CONTROL ECU (See REMOVAL )

CHECK HARNESS AND CONNECTOR (COWL SIDE JUNCTION BLOCK RH - ECU AND BODY GROUND)

Fig 2: Identifying K30, K31 ECU Connectors And 3C Cowl Side Junction Block RH Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Disconnect the K30 and K31 ECU connectors.
Disconnect the 3C cowl side junction block RH connector.
Measure the resistance according to the value (s) in the table below.
Standard Resistance

STANDARD RESISTANCE

Tester Connection	Condition	Specified Condition
K30-5 (IG) - 3C-5	Always	Below 1 Ω
K30-1 (GND) - Body ground	Always	Below 1 Ω
K31-6 (GND) - Body ground	Always	Below 1 Ω

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to next Step

CHECK HARNESS AND CONNECTOR (BATTERY - COWL SIDE JUNCTION BLOCK RH)

Disconnect the 3A cowl side junction block RH connector.
Measure the voltage according to the value (s) in the table below.
Standard Voltage

STANDARD VOLTAGE

Tester Connection	Condition	Specified Condition
3A-1 - Body ground	Always	11 to 14 V

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

Fig 3: Identifying 3A Cowl Side Junction Block RH Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK: Go to next Step

CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - COWL SIDE JUNCTION BLOCK RH AND BODY GROUND)

Disconnect the 3C cowl side junction block RH connector.
Measure the voltage and resistance according to the value (s) in the tables below.
Standard Voltage

STANDARD VOLTAGE

Tester Connection	Condition	Specified Condition
3C-22 - Body ground	Engine switch on (IG)	11 to 14 V

Standard Resistance

STANDARD RESISTANCE

Tester Connection	Condition	Specified Condition
3C-8 - Body ground	Always	Below 1 Ω

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

Fig 4: Identifying 3C Cowl Side Junction Block RH Connector

OK: Go to next Step

CHECK HARNESS AND CONNECTOR (COWL SIDE JUNCTION BLOCK RH - ECU)

Disconnect the K30 ECU connector.
Measure the resistance according to the value (s) in the table below.
Standard Resistance

STANDARD RESISTANCE

Tester Connection	Condition	Specified Condition
K30-5 (IG) - Body ground	Always	10 kΩ or higher

HINT:

If a fuse is blown, replace the fuse.

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

Fig 5: Identifying K30 ECU Connector

OK: REPLACE COWL SIDE JUNCTION BLOCK RH