JF2A Transfer Case System
JF2A TRANSFER / 4WD / AWD: TRANSFER SYSTEM: INSPECTION
1. INSPECT INDICATOR LIGHT
(a) Check the 4LO indicator light.
(1) Start the engine.
(2) Stop the vehicle.
(3) Move the shift lever to N.
(4) Turn the transfer position switch from H4 to L4.
(5) Check the 4LO indicator light.
OK:
(5) If there is a malfunction, inspect the switch, four wheel drive control ECU and transfer shift actuator. If the system is normal, there may be a malfunction in the CAN communication system or combination meter. In that case, first check the CAN communication system How to Proceed With Troubleshooting. Then check the combination meter How To Proceed With Troubleshooting.
(b) Check the center differential lock indicator light.
(1) Start the engine.
(2) Push the center differential lock switch.
NOTICE:
* Do not push the switch while the vehicle is turning.
* Push the switch at a vehicle speed less than 100 km/h (62 mph).
(3) Check the center differential lock indicator light.
OK:
(4) If there is a malfunction, inspect the switch, four wheel drive control ECU and transfer shift actuator. If the system is normal, there may be a malfunction in the CAN communication system or combination meter. In that case, first check the CAN communication system How to Proceed With Troubleshooting. Then check the combination meter How To Proceed With Troubleshooting.
2. INSPECT FUSE
(a) Remove the 4WD fuse from the main body ECU (cowl side junction block LH).
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
(c) If the fuse is blown, inspect the harness connected to the fuse for a short circuit, and repair or replace the harness or replace the fuse.
3. INSPECT TRANSFER POSITION SWITCH
(a) Remove the transfer position switch Removal.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
(c) If there is a malfunction, replace the transfer position switch.
(d) Check the harness and connector (ECU - transfer position switch and body ground).
(1) Disconnect the A27 ECU connector.
(2) Disconnect the E48 transfer position switch connector.
(3) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
(4) If there is a malfunction, repair or replace the harness or connector.
4. INSPECT CENTER DIFFERENTIAL LOCK SWITCH
(a) Remove the center differential lock switch Removal.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
(c) If there is a malfunction, replace the center differential lock switch.
(d) Check the harness and connector (ECU - center differential lock switch and body ground).
(1) Disconnect the A27 ECU connector.
(2) Disconnect the E49 center differential lock switch connector.
(3) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
(4) If there is a malfunction, repair or replace the harness or connector.
5. INSPECT TRANSFER SHIFT ACTUATOR ASSEMBLY (HIGH-LOW TRANSFER SHIFT ACTUATOR)
HINT
After inspecting the ECU power supply or transfer position switch, check the high-low transfer shift actuator.
(a) Check the harness and connector (ECU - high-low transfer shift actuator).
(1) Disconnect the C44 actuator connector.
(2) Disconnect the A27 and A28 ECU connectors.
(1) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
(2) If there is a malfunction, repair or replace the harness or connector.
(b) Check the high-low transfer shift actuator.
(1) Turn the engine switch on (IG).
(2) Stop the vehicle.
(3) Move the shift lever to N.
(4) Check that there is an operating noise from the transfer shift actuator when the transfer position switch is turned from H4 to L4, or L4 to H4.
OK:
There is an operating noise.
HINT
* If the actuator fork cannot move from high to low, or low to high even though there is an operating noise, there may be a mechanical malfunction in the transfer.
* If there is no operating noise, there may be a malfunction in the high-low transfer shift actuator. However, it may also be a result of a mechanical malfunction in the transfer, so inspect each part.
(5) Remove the transfer shift actuator assembly Components.
(6) Check the high to low switch.
1 Connect lines via a relay as shown in the illustration, and check that the actuator fork moves from the high to low position.
NOTICE:
* Make sure to perform this inspection with the actuator removed from the vehicle. If this inspection is performed with the actuator installed to the vehicle, the actuator will be damaged.
* When inspecting the actuator, make sure to operate it with the lines connected via a relay. If the lines are not connected via a relay and battery voltage is directly applied to the actuator, the actuator will be damaged.
HINT
When performing the operation described above, use the DEFOG relay.
2 After the high to low switch is complete, check the neutral position detection switch and limit switch.
1 Measure the resistance according to the value(s) in the table below.
Standard Resistance:
2 If there is a malfunction, replace the transfer shift actuator assembly.
(7) Check the low to high switch.
1 Connect lines via a relay as shown in the illustration, and check that the actuator fork moves from the low to high position.
NOTICE:
* Make sure to perform this inspection with the actuator removed from the vehicle. If this inspection is performed with the actuator installed to the vehicle, the actuator will be damaged.
* When inspecting the actuator, make sure to operate it with the lines connected via a relay. If the lines are not connected via a relay and battery voltage is directly applied to the actuator, the actuator will be damaged.
HINT
When performing the operation described above, use the DEFOG relay.
2 After the low to high switch is complete, check the neutral position detection switch and limit switch.
3 Measure the resistance according to the value(s) in the table below.
Standard Resistance:
4 If there is a malfunction, replace the transfer shift actuator assembly.
6. INSPECT TRANSFER SHIFT ACTUATOR ASSEMBLY (CENTER DIFFERENTIAL LOCK ACTUATOR)
HINT
After inspecting the ECU power supply or center differential lock switch, check the center differential lock actuator.
(a) Check the harness and connector (ECU - center differential lock actuator).
(1) Disconnect the C43 actuator connector.
(2) Disconnect the A27 and A28 ECU connectors.
(3) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
(3) If there is a malfunction, repair or replace the harness or connector.
(b) Check the center differential lock actuator.
(1) Turn the engine switch on (IG).
(2) Check that there is an operating noise from the transfer shift actuator when the center differential lock switch is pressed to switch from Free to Lock, or lock to free.
OK:
There is an operating noise.
HINT
* If the actuator fork cannot move from free to lock, or lock to free even though there is an operating noise, there may be a mechanical malfunction in the transfer.
* If there is no operating noise, there may be a malfunction in the center differential lock actuator. However, it may also be a result of a mechanical malfunction in the transfer, so inspect each part.
(3) Remove the transfer shift actuator assembly Components.
(4) Check the free to lock switch.
1 Connect lines via a relay as shown in the illustration, and check that the actuator fork moves from the free to lock position.
NOTICE:
* Make sure to perform this inspection with the actuator removed from the vehicle. If this inspection is performed with the actuator installed to the vehicle, the actuator will be damaged.
* When inspecting the actuator, make sure to operate it with the lines connected via a relay. If the lines are not connected via a relay and battery voltage is directly applied to the actuator, the actuator will be damaged.
HINT
When performing the operation described above, use the DEFOG relay.
2 After the free to lock switch is complete, check the center differential lock detection switch and limit switch.
3 Measure the resistance according to the value(s) in the table below.
Standard Resistance:
4 If there is a malfunction, replace the transfer shift actuator assembly.
(5) Check the lock to free switch.
1 Connect lines via a relay as shown in the illustration, and check that the actuator fork moves from the lock to free position.
NOTICE:
* Make sure to perform this inspection with the actuator removed from the vehicle. If this inspection is performed with the actuator installed to the vehicle, the actuator will be damaged.
* When inspecting the actuator, make sure to operate it with the lines connected via a relay. If the lines are not connected via a relay and battery voltage is directly applied to the actuator, the actuator will be damaged.
HINT
When performing the operation described above, use the DEFOG relay.
2 After the lock to free switch is complete, check the center differential lock detection switch and limit switch.
1 Measure the resistance according to the value(s) in the table below.
Standard Resistance:
2 If there is a malfunction, replace the transfer shift actuator assembly.
7. INSPECT FOUR WHEEL DRIVE CONTROL ECU
HINT
Inspect the connectors from the back side while the connectors are connected.
(a) Check the four wheel drive control ECU.
(1) Measure the resistance and voltage according to the value(s) in the table below.
(2) If there is a malfunction, inspect the harnesses, connectors, transfer position switch, center differential lock switch, and transfer shift actuator assembly. If these are normal, replace the four wheel drive control ECU Removal.
HINT
*: w/ Temperature Sensor
8. INSPECT NEUTRAL SWITCHING
(a) Switch the transfer to neutral.
(1) Turn the engine switch on (IG).
(2) Move the shift lever to N.
(3) Turn the transfer position switch to H4.
(4) Make sure the center differential lock is set to the free position.
(5) Move the shift lever to P.
(6) Depress the brake pedal 3 times and do not release it on the third time.
(7) Move the shift lever to N.
(8) Depress the brake pedal 3 times.
(9) Turn the transfer position switch as follows: H4 -> L4 -> H4.
HINT
The 4LO indicator light blinks at 2 second intervals (2 seconds on, 2 seconds off).
(10) Move the shift lever to P.
(11) Check that the transfer switches to neutral.
If there is a malfunction, inspect the transfer position switch, four wheel drive control ECU and transfer shift actuator. If the system is normal, there may be a malfunction in the CAN communication system. In that case, first check the CAN communication system How to Proceed With Troubleshooting.
HINT
The 4LO indicator light blinks at 2 second intervals (2 seconds on, 2 seconds off). The A/T P indicator light turns on.
(b) Release the transfer from neutral.
(1) Turn the engine switch on (IG).
(2) Move the shift lever to N.
(3) Turn the transfer position switch as follows: H4 -> L4 -> H4.
(4) Check that the transfer is released from neutral.
If there is a malfunction, inspect the transfer position switch, four wheel drive control ECU and transfer shift actuator. If the system is normal, there may be a malfunction in the CAN communication system. In that case, first check the CAN communication system How to Proceed With Troubleshooting.
HINT
The 4LO indicator light in the combination meter turns off. The release from neutral can be confirmed by checking that the A/T P indicator light does not turn on when the shift lever is moved to P.