Toyota Tacoma (2015-2018) Service Manual: Rear Differential Lock Position SW Stuck ON (P17BC)

Toyota Tacoma (2015-2018) Service Manual / Differential / Differential System(w/ Rear Differential Lock) / Rear Differential Lock Position SW Stuck ON (P17BC)

DESCRIPTION

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

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
P17BC	Rear Differential Lock Position SW Stuck ON	Diagnosis Condition: Ignition switch turned to ON Malfunction Status: Differential lock indicator switch is stuck ON Malfunction Time: 2 seconds or more Other: 1 trip detection logic	Wire harness and connector 4 wheel drive control ECU Differential lock indicator switch

WIRING DIAGRAM

Refer to DTC P17BB (See page PROCEDURE ).

PROCEDURE

1.	CHECK HARNESS AND CONNECTOR (4 WHEEL DRIVE CONTROL ECU - DIFFERENTIAL LOCK INDICATOR SWITCH)

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

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
F13-12 (SLS) or T13-2 (RLY2) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

2.	INSPECT DIFFERENTIAL LOCK INDICATOR SWITCH

(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.

(d) Release the parking brake.

(e) Rotate one rear wheel and set the rear differential to the free condition.

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

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
2 (RLY2) - 1 (GND)	Rear differential free	10 kΩ or higher

Text in Illustration

*a	Component without harness connected (Differential Lock Indicator Switch)

REPLACE 4 WHEEL DRIVE CONTROL ECU

REPLACE DIFFERENTIAL LOCK INDICATOR SWITCH

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. DTC No. Detection Item DTC Detection Condition ...

4WD ECU Malfunction (P163B)

DESCRIPTION This DTC is output when a malfunction is detected in the 4 wheel drive control ECU internal circuit. DTC No. Detection Item DTC Detection Condition ...

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