Inspection Procedure

WARNING: This page is about a different car, the 2006 Toyota 4Runner. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: When replacing the master cylinder solenoid, perform zero point calibration (See CALIBRATION ).

INSPECT SKID CONTROL ECU (EXI TERMINAL VOLTAGE)

Transfer is in 4WD mode (Multi Mode 4WD only).
Disconnect the skid control ECU connector.
Turn the ignition switch to the ON position.

Measure the voltage according to the value(s) in TERMINALS VOLTAGE SPECIFICATION TABLE .

Standard:

TERMINALS VOLTAGE SPECIFICATION TABLE

Tester Connection	Condition	Specified Condition
S28-27 (EXI) - Body ground	Center diff. locked	Below 1.5 V
S28-27 (EXI) - Body ground	Center diff.	free 10 to 14 V

Fig 1: Identifying Skid Control ECU Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: Go to step 3

OK: Go to next step

INSPECT SKID CONTROL ECU (NEO TERMINAL VOLTAGE)

Measure the voltage according to the value(s) in TERMINALS VOLTAGE SPECIFICATION TABLE .

Standard:

TERMINALS VOLTAGE SPECIFICATION TABLE

Tester Connection	Condition	Specified Condition
S28-10 (NEO) - Body ground	Center diff.	locked Below 2 V
S28-10 (NEO) - Body ground	Center diff.	free 10 to 14 V

Fig 2: Identifying Skid Control ECU Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

HINT:

The center diff. lock indicator light comes on while the center differential is being switched to lock. Therefore, perform the measurement after confirming that the indicator light comes on and the center differential is actually locked by driving the vehicle.

NG: Go to step 8

OK: Go to step 11

INSPECT CENTER DIFFERENTIAL LOCK SWITCH (GROUND TERMINAL CONTINUITY)

Disconnect the center diff. lock switch connector.

Measure the resistance according to the value(s) in TERMINALS RESISTANCE SPECIFICATION TABLE .

Standard:

TERMINALS RESISTANCE SPECIFICATION TABLE

Tester Connection	Specified Condition
D4-4 - Body ground	Below 1

Fig 3: Identifying Center Diff. Lock Switch Connectors

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (GROUND CIRCUIT)

OK: Go to next step

INSPECT CENTER DIFFERENTIAL LOCK SWITCH

Measure the resistance according to the value(s) in TERMINALS RESISTANCE SPECIFICATION TABLE .

Standard:

TERMINALS RESISTANCE SPECIFICATION TABLE

Tester Connection	Condition	Specified Condition
D4-3 - D4-4	Switch is pushed in	Below 1
D4-3 - D4-4	Switch is not pushed in	10 k or higher

Fig 4: Inspecting Center Differential Lock Switch

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE CENTER DIFFERENTIAL LOCK SWITCH

OK: Go to next step

INSPECT FOUR WHEEL DRIVE CONTROL ECU
1. Check the select high-low system (See INSPECTION ) or the select 2-4 and high-low system (See INSPECTION ).
NG: REPLACE FOUR WHEEL DRIVE CONTROL ECU

OK: Go to next step

CHECK HARNESS AND CONNECTOR (BETWEEN FOUR WHEEL DRIVE CONTROL ECU AND CENTER DIFFERENTIAL LOCK SWITCH) (See HOW TO PROCEED WITH TROUBLESHOOTING )

Disconnect the 4WD control ECU (F9) connector and center diff. lock switch connector.

Measure the resistance according to the value(s) in TERMINALS RESISTANCE SPECIFICATION TABLE .

Standard:

TERMINALS RESISTANCE SPECIFICATION TABLE

Tester Connection	Specified Condition
F9-16 (DL) - D4-3	Below 1
F9-16 (DL) - Body ground	10 k or higher

Fig 5: Disconnecting 4WD Control ECU Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to next step

CHECK HARNESS AND CONNECTOR (BETWEEN SKID CONTROL ECU AND FOUR WHEEL DRIVE CONTROL ECU) (See HOW TO PROCEED WITH TROUBLESHOOTING )

Disconnect the 4WD control ECU (F10) connector.

Measure the resistance according to the value(s) in TERMINALS RESISTANCE SPECIFICATION TABLE .

Standard:

TERMINALS RESISTANCE SPECIFICATION TABLE

Tester Connection	Specified Condition
S28-27 (EXI) - F10-22 (P1)	Below 1
S28-27 (EXI) - Body ground	10 k or higher

Fig 6: Disconnecting 4WD Control ECU (F10) Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to step 11

CHECK HARNESS AND CONNECTOR (BETWEEN SKID CONTROL ECU AND FOUR WHEEL DRIVE CONTROL ECU) (See HOW TO PROCEED WITH TROUBLESHOOTING )

Disconnect the 4WD control ECU (F9) connector.

Measure the resistance according to the value(s) in TERMINALS RESISTANCE SPECIFICATION TABLE .

Standard:

TERMINALS RESISTANCE SPECIFICATION TABLE

Tester Connection	Specified Condition
S28-10 (NEO) - F9-20 (IND2)	Below 1
S28-10 (NEO) - Body ground	10 k or higher

Fig 7: Disconnecting 4WD Control ECU (F9) Connector

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to next step

CHECK HARNESS AND CONNECTOR (BETWEEN SKID CONTROL ECU AND COMBINATION METER) (See HOW TO PROCEED WITH TROUBLESHOOTING )

Disconnect the combination meter connector.

Measure the resistance according to the value(s) in TERMINALS RESISTANCE SPECIFICATION TABLE .

Standard:

TERMINALS RESISTANCE SPECIFICATION TABLE

Tester Connection	Specified Condition
S28-10 (NEO) - C11-6	Below 1
S28-10 (NEO) - Body ground	10 k or higher

Fig 8: Identifying Skid Control ECU Connector & Combination Meter Connector

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to next step

INSPECT COMBINATION METER ASSY
1. Check the combination meter system (See HOW TO PROCEED WITH TROUBLESHOOTING ).
NG: REPLACE COMBINATION METER ASSY (See COMBINATION METER ASSY )

OK: Go to next step

RECONFIRM DTC

Clear the DTC (see DTC CHECK/CLEAR ).

Check if the same DTC is detected (see DTC CHECK/CLEAR ).

HINT:

Reinstall the sensors, connectors, etc. and restore the previous vehicle conditions before rechecking for DTCs.

Result:

RESULT REFERENCE

DTC is output	A
DTC is not output	B

B: END

A: REPLACE MASTER CYLINDER SOLENOID (See OVERHAUL )