Toyota 4Runner: ECM Communication Stop Mode

Toyota 4Runner Service Manual / Power Source / Network / Networking / Can Communication System / ECM Communication Stop Mode

DESCRIPTION

Detection Item	Symptom	Trouble Area
ECM Communication Stop Mode	Either condition is met: "ECM (Engine)" is not displayed on the "CAN Bus Check" screen. "ECM Communication Stop Mode" in "DTC Combination Table" applies.	Power source or inside ECM ECM

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE

1.	CHECK HARNESS AND CONNECTOR (ECM - BATTERY AND BODY GROUND)

(a) Disconnect the B38, B39 and F51 ECM connectors.

Text in Illustration

Front view of wire harness connector

(to ECM)

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
B38-12 (E1) - Body ground	Always	Below 1 Ω
B39-10 (ME01) - Body ground	Always	Below 1 Ω
B39-14 (E01) - Body ground	Always	Below 1 Ω
B39-15 (E02) - Body ground	Always	Below 1 Ω
F51-12 (EC) - Body ground	Always	Below 1 Ω

Standard Voltage:

Tester Connection	Condition	Specified Condition
F51-24 (BATT) - Body ground	Always	11 to 14 V
F51-23 (+B2) - Body ground	Battery positive (+) voltage applied to terminal F51-9 (MREL)	11 to 14 V
F51-22 (+B) - Body ground	Battery positive (+) voltage applied to terminal F51-9 (MREL)	11 to 14 V

REPLACE ECM

REPAIR OR REPLACE HARNESS OR CONNECTOR

Yaw Rate Sensor Communication Stop Mode

DESCRIPTION Detection Item Symptom Trouble Area Yaw Rate Sensor Communication Stop Mode Either condition is met: "Yaw R ...

Main Body ECU Communication Stop Mode

DESCRIPTION Detection Item Symptom Trouble Area Main Body ECU Communication Stop Mode Either condition is met: "Main Bo ...

Other materials about Toyota 4Runner:

Rear Axle Hub Bolt
Components COMPONENTS ILLUSTRATION Replacement REPLACEMENT CAUTION / NOTICE / HINT HINT: Use the same procedure for the RH and LH sides. The procedure listed below is for the LH side. PROCEDURE 1. REMOVE REAR WHEEL 2. REMOVE P ...

Sliding Roof ECU Communication Stop (B1273)
DESCRIPTION This DTC is stored when LIN communication between the sliding roof ECU (sliding roof drive gear sub-assembly) and main body ECU (multiplex network body ECU) stops for 10 seconds or more. DTC Code DTC Detection Condition ...