Toyota 4Runner: ACC Monitor Malfunction (B2274)

Toyota 4Runner Service Manual / Vehicle Interior / Theft Deterrent / Keyless Entry / Smart Key System(for Start Function) / ACC Monitor Malfunction (B2274)

DESCRIPTION

This DTC is stored when there is a problem in the ACC output circuit, which is from the ACC output terminal of the power management control ECU to the ACC relay.

HINT:

When the power management control ECU is replaced with a new one and the cable is connected to the negative (-) battery terminal, the power source mode is reset to on (IG). When the battery is removed and reinstalled, the power source mode that was selected when the battery was removed is restored.

DTC Code	DTC Detection Condition	Trouble Area
B2274	The ACC relay actuation circuit inside the power management control ECU or other related circuit is malfunctioning.	AM2 fuse Main body ECU (Driver side junction block assembly) (ACC relay) Power management control ECU Harness or connector

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

When using the Techstream with the engine switch off to troubleshoot: Connect the Techstream to the vehicle and turn a courtesy light switch on and off at 1.5 second intervals until communication between the Techstream and vehicle begins.
Before performing the inspection, check that there are no problems related to the CAN communication system and LIN communication system.
Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE

1.	CHECK HARNESS AND CONNECTOR (BATTERY - POWER MANAGEMENT CONTROL ECU)

REPAIR OR REPLACE HARNESS OR CONNECTOR

2.	CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - BODY GROUND)

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.	INSPECT DRIVER SIDE JUNCTION BLOCK ASSEMBLY (ACC RELAY)

(a) Remove the driver side junction block assembly.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
2C-48 - 2B-4	20°C (68°F)	101.25 to 123.75 Ω

Text in Illustration

*a	Component without harness connected (Driver Side Junction Block Assembly)

REPLACE MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK ASSEMBLY)

4.	CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - DRIVER SIDE JUNCTION BLOCK ASSEMBLY)

(a) Disconnect the F80 power management control ECU connector.

(b) Disconnect the 2C driver side junction block assembly connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
F80-19 (ACCD) - 2C-48	Always	Below 1 Ω
F80-19 (ACCD) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.	CHECK HARNESS AND CONNECTOR (DRIVER SIDE JUNCTION BLOCK ASSEMBLY - BODY GROUND)

REPAIR OR REPLACE HARNESS OR CONNECTOR

6.	CHECK POWER MANAGEMENT CONTROL ECU

(a) Connect the power management control ECU connector.

Text in Illustration

Component with harness connected

(Power Management Control ECU)

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

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
F80-19 (ACCD) - Body ground	Engine switch off	Below 1 V
F80-19 (ACCD) - Body ground	Engine switch on (ACC)	((Voltage at terminal AM21 or AM22) minus 2.0 V) or higher

USE SIMULATION METHOD TO CHECK

REPLACE POWER MANAGEMENT CONTROL ECU

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