Toyota Tacoma manuals

Toyota Tacoma 2015-2018 Service Manual: 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.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

F13-12 (SLS) or T13-2 (RLY2) - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

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.

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

(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)

OK

REPLACE 4 WHEEL DRIVE CONTROL ECU

NG

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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