Toyota Tacoma (2015-2018) Service Manual: Rear Differential Lock Solenoid Circuit High (P17C1)

Toyota Tacoma (2015-2018) Service Manual / Differential / Differential System(w/ Rear Differential Lock) / Rear Differential Lock Solenoid Circuit High (P17C1)

DESCRIPTION

This DTC is output when a malfunction is detected due to a battery short occurring in the differential lock coil drive circuit of the rear differential.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
P17C1	Rear Differential Lock Solenoid Circuit High	Diagnosis Condition: Directly after ignition switch is turned to ON, or when rear differential is switched between free and locked (differential lock coil operating) with ignition switch turned to ON Malfunction Status: Battery short in differential lock coil drive circuit Malfunction Time: 0.05 seconds or more Other: 1 trip detection logic	Wire harness and connector 4 wheel drive control ECU Differential lock coil

WIRING DIAGRAM

Refer to DTC P17C0 (See page PROCEDURE ).

PROCEDURE

1.	CHECK DIFFERENTIAL LOCK COIL

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

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

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
F12-1 (SL+) or F12-5 (SL-) - Body ground	Ignition switch ON	Below 1 V

Text in Illustration

*a	Front view of wire harness connector (to 4 Wheel Drive Control ECU)

REPLACE 4 WHEEL DRIVE CONTROL ECU

2.	CHECK HARNESS AND CONNECTOR (4 WHEEL DRIVE CONTROL ECU - DIFFERENTIAL LOCK COIL)

(a) Disconnect the F12 4 wheel drive control ECU connector.

(b) Disconnect the D28 differential lock coil connector.

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
F12-1 (SL+) or D28-2 (SL+) - Body ground	Ignition switch ON	Below 1 V
F12-5 (SL-) or D28-1 (SL-) - Body ground	Ignition switch ON	Below 1 V

REPLACE DIFFERENTIAL LOCK COIL

REPAIR OR REPLACE HARNESS OR CONNECTOR

Rear Differential Lock Solenoid Circuit Low (P17C0)

DESCRIPTION This DTC is output when a malfunction is detected due to a short to ground occurring in the differential lock coil drive circuit of the rear differential. DTC No. ...

Rear Differential Lock Control SW Stuck ON (P17CC)

DESCRIPTION This DTC is output when a malfunction of the differential lock switch is detected. DTC No. Detection Item DTC Detection Condition Trouble Area ...

Other materials:

Unable to Lock Steering Wheel
DESCRIPTION The steering lock actuator assembly activates the steering lock motor and moves the lock bar into the steering column to lock the steering. When the steering lock is operating, the steering may not lock when the lock bar is not aligned with the lock hole of the steering column. In ...

Problem Symptoms Table
PROBLEM SYMPTOMS TABLE HINT: Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each sy ...

Open in Driver Side Electrical Antenna Circuit (B27A1)
DESCRIPTION The certification ECU (smart key ECU assembly) generates a request signal and transmits the signal to the front door outside handle assembly LH [electrical key antenna] at intervals of 0.25 seconds. For the front door outside handle assembly LH [electrical key antenna] to detect w ...