Toyota Tacoma 2015-2018 Service Manual: Rear Differential Lock Position SW Stuck OFF (P17BB)

DESCRIPTION

This DTC is output when an OFF malfunction of the differential lock indicator switch is detected.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

HINT:

for 4WD:

When the rear differential lock position switch (transfer indicator switch) is stuck OFF, if the transfer is set to 2WD, the vehicle is stopped and the ignition switch is turned from off to ON, the system returns to normal and this DTC is stored as a past DTC.

If the transfer is set to L4 again, the rear differential is locked and the vehicle is driven at 5 km/h or more, this DTC is output again.

for 2WD:

When the rear differential lock position switch (transfer indicator switch) is stuck OFF, the vehicle is stopped and the ignition switch is turned from off to ON, the system returns to normal and this DTC is stored as a past DTC.

If the rear differential is locked and the vehicle is driven at 5 km/h or more, this DTC is output again.

PROCEDURE

(a) Disconnect the F13 4 wheel drive control ECU connector.

(b) Disconnect the T13 differential lock indicator switch connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

(a) Disconnect the differential lock indicator switch connector.

(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

NG

REPLACE 4 WHEEL DRIVE CONTROL ECU

OK

(a) for Automatic Transmission:

Move the shift lever to N.

for Manual Transmission:

Move the shift lever to neutral.

(b) for 4WD:

Switch the transfer position switch to L4.

(c) Lift up the vehicle until all four wheels are off the ground.

(d) Release the parking brake.

(e) Operate the differential lock switch to switch to locked.

HINT:

The rear differential lock indicator light continues to blink.

(f) Rotate one rear wheel in both directions and set the rear differential to the locked condition.

HINT:

When the rear differential is locked, rotating one rear wheel causes the other rear wheel to rotate in the same direction.

(g) Measure the voltage according to the value(s) in the table below. Standard Voltage: Tester Connection Condition Specified Condition F13-12 (SLS) - Body ground Rear differential in locked condition Below 1.5 V Text in Illustration *a Component with harness connected (4 Wheel Drive Control ECU)

OK

REPLACE 4 WHEEL DRIVE CONTROL ECU

NG

REPLACE DIFFERENTIAL LOCK INDICATOR SWITCH