TROUBLE DIAGNOSIS
TF-51
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4.G-SENSOR HARNESS INSPECTION
1. Disconnect G-sensor connector.
2. Disconnect control unit connector.
3. Check harness between control unit and G-sensor.
OK or NG
OK >> GO TO 5.
NG >> Repair or replace the harness.
5.G-SENSOR CIRCUIT CONNECTOR INSPECTION
Check the G-sensor and the control unit harness connector (including intermediate connector).
OK or NG
OK >> Perform the following.
1. Connect the connector and perform self-diagnosis again.
2. Be sure to drive the vehicle at 30km/h (19MPH) for 1minutes or longer and be sure that the
4WD warning lamp does not come on.
NG >> Repair or replace the connector.
4WD SOLENOID, ACTUATOR RELAY SYSTEM
Checking procedure
1.INSPECTION START
Use CONSULT-II and perform self-diagnosis.
OK or NG
OK >> Drive at 30 km/h (19MPH) for at least 1 minute. Check that 4WD warning lamp does not turn ON.
NG >> GO TO 2.
2.CONNECTOR INSPECTION
1. Disconnect the 4WD control unit connector and the 4WD solenoid connector. Check that terminals are not
deformed. Check that the connectors were connected properly. Reconnect connectors.
2. Perform self-diagnosis again.
OK or NG
OK >> Diagnosis completed.
NG >> GO TO 3.
3.INSPECTION OF 4WD SOLENOID UNIT
1. Disconnect connector B152 and check resistance between terminals No.1 and 2.
OK or NG
OK >> GO TO 4.
NG >> Replace 4WD solenoid.1 - 2 Approx. 2.45W
TF-58
TROUBLE DIAGNOSIS
WHILE DRIVING, 4WD WARNING LAMP FLASHES SLOWLY. (WHEN IT CONTINUES TO ILLU-
MINATE UNTIL ENGINE TURNS OFF.)
1. Check using the data monitor function of the CONSULT-II.
lPerform inspection with the data monitor function of the CONSULT-II.
lCheck if the value of IMPROPER SIZE TIRE MONITOR is 8 mm (0.31 in) or more.
lStop the engine. Restart the engine and drive the vehicle at 20 km/h (12 MPH) or faster for approxi-
mately 200 seconds. Confirm the 4WD warning lamp flashes slowly.
(Check if the value of IMPROPER SIZE TIRE MONITOR is 8 mm (0.31 in) or more.)
When the tire size is normal, the value of IMPROPER SIZE TIRE MONITOR will change from 8 mm
(0.31 in) or more to 0 to 4 mm (0 to 0.16 in) (normal condition) after the vehicle is driven 20 km/h (12
MPH) or faster for approximately 5 seconds.
2. Tire inspection
lInspection of tire pressure
lWear condition
lCheck size of the front and rear tires. (No excessive difference should be observed.)
VEHICLE DOES NOT ENTER 4WD MODE EVEN THOUGH 4WD WARNING LAMP IS OFF.
1. Check using the data monitor function of the CONSULT-II.
Perform inspection by the data monitor function of the CONSULT-II.
–Check if the vehicle operation changes to 2WD, AUTO, and LOCK modes.
–Check current supplied to the 4WD solenoid valve in AUTO mode.
2. Check using the active test function of the CONSULT-II.
Using active test mode of CONSULT-II, supply current to the 4WD solenoid valve and check that the mon-
itor current becomes close to this supply current.
lThe 4WDcontrol unit is normal when the difference between 4WD solenoid valve current and the monitor
current is within±10%.
It is necessary to inspect the electronically controlled coupling assembly.
TIGHT-CONER BRAKING SYMPTOM OCCURS WHEN THE VEHICLE IS STARTED IN AUTO
WARNING LAMP REMAIN OFF).
1.THROTTLE POSITION SENSOR AND HARNESS INSPECTION
Check accelerator pedal stroke.
OK or NG
OK >> Perform self-diagnosis again.
NG >> Malfunctioning throttle position sensor harness
4WD ACTUATOR RELAY (4WD SOLENOID ACTUATOR RELAY) TURNS ON/OFF FREQUENTLY
1.SELF-DIAGNOSIS RESULT IS 4WD ACTUATOR RELAY (4WD SOLENOID ACTUATOR RELAY) ON
ERROR AND OFF ERROR.
Is self-diagnosis result [ON error and OFF error]?
OK or NG
OK >> GO TO 2.
NG >> Repair or replace as necessary.Accelerator pedal not
depressed:Approx. 0A
Accelerator pedal
depressed:Approx. 2.8A
Example) Monitor value becomes approx. 1A for 4WD solenoid current 1A setting.
