4WD Control System Inspection
INSPECTION4WD Control System
1) Install special tool to air hose connecting between air pump assembly and differential (actuator) as shown in figure. Tighten adjusting screw of special tool as far as it stops. Close air check side opening by using fuel hose as blind plug.
Special Tool
(A): 09918-18110
(B): 09367-04002
NOTE: Use care not to bend any part of hose.
2) Turn ON ignition switch and shift transfer lever from 2H to 4H range.
3) Check that motor starts running (a sound can be heard) within 1 second and it stops when gauge of special tool indicates specified pressure value.
Check also for air leakage.
Pressure specification: 38.0 - 58.0 kPa (0.38 - 0.58 kg/cm2, 5.40 - 8.25 psi)
4) Check that pressure value indicated on gauge of special tool drops as soon as transfer lever is shifted to 2H position.
5) Start motor by shifting transfer lever to 4H position again. Loosen adjusting screw to lower pressure value on gauge. Motor should start to run again and stop in about 4 seconds.
6) With the adjusting screw of special tool loosened, shift transfer shift lever to N or 2H position and then 4L or 4H position.
Pump motor should stop about 10 seconds after motor starts to run.
Actuator
1) Disconnect air hose from pump assembly and install special tool to air hose as shown in figure. Loosen adjusting screw of special tool.
Special Tool (A): 09918-18110
2) Connect compressor air hose to special tool.
Blow air and turn adjusting screw to obtain specified pressure.
Specified pressure: 38.0 kPa (0.38 kg/cm2, 5.40 psi)
CAUTION: Do not apply a pressure exceeding 200 kPa (2.0 kg/cm2, 28.4 psi) which may cause damage to diaphragm.
3) With the vehicle lifted so that both of the front wheels are off the ground, turn one of the front wheels by hand and check the other wheel, which should act as described below.
^ When the pressure from compressor is applied to actuator:
The other front wheel should turn in the direction opposite to the tire being turned by hand.
^ When the pressure from compressor is not applied to actuator: The other front wheel should remain stationary while the tire pushed by hand is turning.
If the result is not satisfactory, inspect differential assembly.
Air Pump Assembly
Removal/Installation
1) Disconnect air hoses and coupler from air pump assembly.
2) Remove pump assembly by removing bolts.
3) Reverse removal procedure for installation.
Tightening Torque (a): 13 Nm (1.3 kg-m, 9.5 ft. lbs.)
Inspection
1) Install special tool, voltmeter and battery to pump assembly as shown in figure.
2) Tighten adjusting screw of special tool as far as it stops and close its air check side opening by using fuel hose as blind plug.
Special Tool (A): 09918-18110
3) Check that motor starts to run (a sound can be heard) when battery is connected and it stops when specified pressure is obtained. Check also for air leakage.
Specified pressure: 38.0 - 58.0 kPa (0.38 - 0.58 kg/cm2, 5.40 - 8.25 psi)
4) Check that value indicated on voltmeter is within specification shown below.
When motor is running: About 0 V
When motor has stopped running: 10 - 14 V