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 ...

Other materials:

Tire Pressure Monitor ECU Communication Stop (C2179/79)
DESCRIPTION The main body ECU (multiplex network body ECU) sends signals to the tire pressure warning ECU and receiver via a direct line. DTC No. Detection Item DTC Detection Condition Trouble Area Note C2179/79 T ...

Engine
General Maintenance GENERAL MAINTENANCE CAUTION / NOTICE / HINT HINT: Inspect these items when the engine is cold. PROCEDURE 1. REPLACE CHAIN SUB-ASSEMBLY HINT: 2TR-FE: See page 2GR-FKS: See page 2. INSPECT DRIVE BELT HINT: 2TR-FE: See page 2GR-FKS: ...

Front Passenger Side Seat Belt Warning Light Malfunction
DESCRIPTION The occupant classification ECU detects the state of the front seat inner belt assembly RH and load sensor when the front passenger side seat is occupied with the ignition switch ON. If the front passenger side seat belt is not fastened, the front passenger side seat belt warning ...