Toyota 4Runner manuals

Toyota 4Runner: 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

*a

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

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

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


OK

REPLACE ECM


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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