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:

Removal
REMOVAL PROCEDURE 1. REMOVE REAR SEAT CUSHION ASSEMBLY (a) Remove the 6 bolts and 2 rear seat cushion assemblies. 2. REMOVE NO. 4 ROOM PARTITION COVER LH 3. REMOVE NO. 4 ROOM PARTITION COVER RH 4. REMOVE NO. 3 ROOM PARTITION COVER ...

Data List / Active Test
DATA LIST / ACTIVE TEST 1. ACTIVE TEST HINT: Using the Techstream to perform Active Tests allows relays, VSVs, actuators and other items to be operated without removing any parts. This non-intrusive functional inspection can be very useful because intermittent operation may be discovered befo ...

On-vehicle Inspection
ON-VEHICLE INSPECTION PROCEDURE 1. INSPECT OCCUPANT DETECTION ECU (for Vehicle not Involved in Collision) (a) Perform a diagnostic system check (See page ). 2. INSPECT OCCUPANT DETECTION ECU (for Vehicle Involved in Collision) (a) Perform a diagnostic system check (See page ). (b) Even if ...