Toyota Tacoma (2015-2018) Service Manual: Rear Differential Lock Control SW Stuck ON (P17CC)

Toyota Tacoma (2015-2018) Service Manual / Differential / Differential System(w/ Rear Differential Lock) / 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
P17CC	Rear Differential Lock Control SW Stuck ON	Diagnosis Condition: Directly after the ignition switch is turned to ON, or when the ignition switch is ON Malfunction Status: Differential lock switch stuck ON Malfunction Time: 0.3 seconds or more when the ignition switch is turned to ON, or 60 seconds or more with the ignition switch ON Other: 1 trip detection logic	Wire harness and connector 4 wheel drive control ECU Differential lock switch

WIRING DIAGRAM

PROCEDURE

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

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

(b) Disconnect the D5 differential lock switch connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
F13-15 (R) or D5-6 (B) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

2.	INSPECT ROOF CONSOLE BOX ASSEMBLY

(a) Remove the roof console box assembly.

for Double Cab: (See page ).
for Access Cab: (See page ).

Text in Illustration

Component without harness connected

(Roof Console Box Assembly)

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
R44-6 (B) - 6 (B)	Always	Below 1 Ω
R44-12 (GND)- 3 (E)	Always	Below 1 Ω

Result

Result	Proceed to
OK	A
NG (for Double Cab)	B
NG (for Access Cab)	C

REPLACE ROOF CONSOLE BOX ASSEMBLY

3.	INSPECT DIFFERENTIAL LOCK SWITCH

(a) Disconnect the D5 differential lock switch connector.

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

Standard Resistance:

Tester Connection	Switch Condition	Specified Condition
6 - 3	Switch not pressed	10 kΩ or higher

Text in Illustration

*a	Component without harness connected (Differential Lock Switch)

REPLACE 4 WHEEL DRIVE CONTROL ECU

REPLACE DIFFERENTIAL LOCK SWITCH

Rear Differential Lock Solenoid Circuit High (P17C1)

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Other materials:

Components
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Inspection
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How To Proceed With Troubleshooting
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