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

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