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:

Acceleration Sensor Malfunction (C1420)
DESCRIPTION Refer to DTCs C1419 and C1435 (See page ). DTC Code DTC Detection Condition Trouble Area C1420 After the difference between GL1 and GL2 becomes 0.6 G or more with the vehicle stationary, the difference remains 0.4 G or m ...

Low Output Signal of Rear Speed Sensor RH (Test Mode DTC) (C1273,C1274,C1403,C1404)
DESCRIPTION Refer to DTCs C1401 and C1402 (See page ). DTC Code DTC Detection Condition Trouble Area C1273 C1274 Stored only during test mode. Rear speed sensor RH/LH Rear speed sensor rotor RH/LH (rear ax ...

Display does not Dim when Light Control Switch is Turned ON
PROCEDURE 1. CHECK IMAGE QUALITY SETTING (a) Display the "Display Settings" screen. (b) Turn the light control switch to the tail or head position. (c) Check if "Day Mode" on the display adjustment screen is on. OK: "Day Mode" sett ...