Toyota Tacoma (2015-2018) Service Manual: Four Wheel Drive (4WD) Low Switch Circuit Range / Performance (P2772)

Toyota Tacoma (2015-2018) Service Manual / Vf2cm Transfer / Touch Select 2-4 And High-low System / Four Wheel Drive (4WD) Low Switch Circuit Range / Performance (P2772)

DESCRIPTION

This DTC is output when a malfunction in the L4 detection switch is detected.

DTC No.	Detection Item	DTC Detection Condition	Trouble Area
P2772	Four Wheel Drive (4WD) Low Switch Circuit Range / Performance	Diagnosis Condition: Ignition switch turned to ON (3 seconds elapse after ignition switch is turned to ON) Malfunction Status: L4 detection switch is stuck OFF when the vehicle is in L4 Malfunction Time: 10 seconds or more Other: 1 trip detection logic	Wire harness and connector 4 wheel drive control ECU Transfer shift actuator assembly

WIRING DIAGRAM

PROCEDURE

1.	CHECK HARNESS AND CONNECTOR (4 WHEEL DRIVE CONTROL ECU - TRANSFER SHIFT ACTUATOR ASSEMBLY)

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

(b) Disconnect the T4 transfer shift actuator assembly connector.

Disconnect the S1 skid control ECU (Master Cylinder Solenoid) connector.

for Vacuum Brake Booster:

Disconnect the S1 skid control ECU (brake actuator assembly) connector.

(d) for 2TR-FE:

Disconnect the E21 ECM connector.

for 2GR-FKS:

Disconnect the E13 ECM connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
F13-3 (4WDL) - T4-9 (L4)	Always	Below 1 Ω
T4-10 (GND) - Body ground	Always	Below 1 Ω
F13-3 (4WDL) or T4-9 (L4) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

2.	CHECK TRANSFER SHIFT ACTUATOR ASSEMBLY

(a) Turn the ignition switch to ON.

(b) Turn the transfer position switch to L4.

(d) Disconnect the T4 transfer shift actuator assembly connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
9 (L4) - 10 (GND)	Always	Below 1 Ω

Text in Illustration

*a	Component without harness connected (Transfer Shift Actuator Assembly)

REPLACE 4 WHEEL DRIVE CONTROL ECU

REPLACE TRANSFER SHIFT ACTUATOR ASSEMBLY

Front Differential Oil Temperature Sensor Circuit High (P17C8)

DESCRIPTION This DTC is output when a short to B+ or open circuit in the oil temperature sensor is detected. DTC No. Detection Item DTC Detection Condition ...

Invalid Data Received From Vehicle Dynamics Control Module (U0416)

DESCRIPTION This DTC is detected if a wheel speed malfunction signal is sent from the skid control ECU (brake actuator assembly). DTC No. Detection Item DTC Detect ...

Other materials:

ECM Communication Stop Mode
DESCRIPTION Detection Item Symptom Trouble Area ECM Communication Stop Mode Either condition is met: Communication stop for "ECM (Engine)" is indicated on the "Communication Bus Check" screen of the ...

Panel Switches do not Function
PROCEDURE 1. CHECK PANEL SWITCH (a) Check for foreign matter around the switches that might prevent operation. OK: No foreign matter is found. NG REMOVE ANY FOREIGN MATTER FOUND OK ...

Installation
INSTALLATION CAUTION / NOTICE / HINT HINT: The following procedures are for BD22 (w/ Differential Lock). PROCEDURE 1. INSTALL REAR DIFFERENTIAL CARRIER ASSEMBLY (a) Clean the contact surfaces of the rear differential carrier assembly and axle housing. (b) Install the rear differential carri ...