Toyota all-wheel drive. Differentials of LC 300

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Eugenio,77
mail@toyota-club.net
© Toyota-Club.Net
Jun 2021


New Land Cruiser equipped with transfer JF2BM, that mainly seems JF2A of former LC 200, except the new oil pump, and the same principle: 2-range with LSD Torsen type center differential + mechanical locking.


1 - low planetary gear, 2 - input shaft, 3 - oil pump rotor, 4 - gear shift fork 2, 5 - gear shift fork 1, 6 - driven sprocket, 7 - silent chain, 8 - shift actuator, 9 - rear output shaft, 10 - center differential case

Front differential - SD22B (free, 2 pinions) or SD22BN (w/ locking, 4 pinions).



Rear differential - BD24C (free, 2 pinions) or BD24CN (w/ locking, 4 pinions) or BD24CT (LSD Torsen).



The locking of front/rear differential is permitted under conditions:
- transfer L4L mode selected
- speed less than 8 km/h


Front differential. 1 - side gear (dog clutch), 2 - lock spring, 3 - lock cam ring, 4 - differential case, 5 - lock position plate, 6 - lock coil


Rear differential. 1 - side gear (dog clutch), 2 - differential case, 3 - lock plunger, 4 - lock coil, 5 - lock position plate, 6 - lock cam ring, 7 - lock spring

The principle of operation is similar to other variations of "E-locker": when current is applied to the coil, the lock cam ring moves and engages with the back side of the side gear (performed as dog clutch) so locking the differential. The state of the differentials is monitored by the lock actuation sensors.


A - normal driving, B - left wheel spinning (diff not locked), C - differential lock engaged. 1 - lock coil, 2 - lock cam ring, 3 - side gear (dog clutch)

DTC of 4WD control system (LC 300):
DTC #

Item

P17A811Transfer Case Shift Motor Control Circuit Short to Ground
P17A812Transfer Case Shift Motor Control Circuit Short to Battery
P17B811Front Differential Unit Actuator A Control Circuit Circuit Short to Ground
P17B812Front Differential Unit Actuator A Control Circuit Circuit Short to Battery
P17B813Front Differential Unit Actuator A Control Circuit Circuit Open
P17B81CFront Differential Unit Actuator A Control Circuit Circuit Voltage Out of Range
P17B949Differential Unit Actuator Control Module Internal Electronic Failure
P17C211Rear Differential Unit Actuator A Control Circuit Circuit Short to Ground
P17C212Rear Differential Unit Actuator A Control Circuit Circuit Short to Battery
P17C213Rear Differential Unit Actuator A Control Circuit Circuit Open
P17C21CRear Differential Unit Actuator A Control Circuit Circuit Voltage Out of Range
P17CA9ERear Differential Lock Switch A Stuck On
P17CA9FRear Differential Lock Switch A Stuck Off
P17DE13Center Differential Lock Shift Motor Circuit Open
P17DF62Center Differential Lock Limit Switch Signal Compare Failure
P17EE11Front Differential Unit Actuator A Position Sensor A Circuit Circuit Short to Ground
P17EE15Front Differential Unit Actuator A Position Sensor A Circuit Circuit Short to Battery or Open
P17EF1CFront Differential Unit Actuator A Position Sensor A Circuit Voltage Out of Range
P17F328Front Differential Unit Actuator A Current Sensor A Signal Bias Level Out of Range / Zero Adjustment Failure
P17F428Rear Differential Unit Actuator A Current Sensor A Signal Bias Level Out of Range / Zero Adjustment Failure
P17F813Transfer Case H-L Motor Circuit Open
P17F928Transfer Case Shift Motor Current Sensor A Signal Bias Level Out of Range / Zero Adjustment Failure
P17FA9EFront Differential Lock Switch A Stuck On
P17FA9FFront Differential Lock Switch A Stuck Off
P17FB62Transfer Case H-L Motor Limit Switch Signal Compare Failure
U010187Lost Communication with TCM Missing Message
U012987Lost Communication with Brake System Control Module A Missing Message


Toyota all-wheel drive. Review
· ATC/DTC · V-Flex · DTV · i-Four · Torsen · E-Four ·
· C.Diff Auto A241H / A540H · C.Diff Lock · C.Diff Visc · FT-Visc ·





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