ECM Communication Stop Mode

CAN COMMUNICATION SYSTEM: ECM Communication Stop Mode

ECM Communication Stop Mode

DESCRIPTION

HINT: "Engine" and "ECT" refer to the circuit that includes the ECM.

WIRING DIAGRAM

INSPECTION PROCEDURE

NOTICE:
- Turn the ignition switch off before measuring the resistance of the CAN main wires and CAN branch wires.
- After the ignition switch is turned off, check that the key reminder warning system and light reminder warning system are not operating.
- Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the ignition switch, any other switches or the doors. If doors need to be opened in order to check connectors, open the doors and leave them open.

HINT: Operating the ignition switch, any other switches, or any doors triggers related ECU and sensor communication on the CAN. This communication will cause the resistance value to change.

PROCEDURE

1. CHECK FOR OPEN IN CAN BUS WIRE (ECM MAIN BUS WIRE)
(a) Turn the ignition switch to the LOCK position.
(b) Disconnect the ECM connector (E5).

NG -- REPAIR OR REPLACE ECM MAIN BUS WIRE OR CONNECTOR (CAN-H, CAN-L)
OK -- Continue to next step.
2. CHECK WIRE HARNESS (+B, +B2, E01)
(a) Reconnect the ECM connector (E5).
(b) Disconnect the ECM connectors (E4) and (E8).

(d) Measure the voltage according to the value(s) in the table below.
Standard voltage:

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE ECM