Steering Control ECU Communication Stop Mode [09/2014 - 11/2017]: Procedure
- CHECK FOR OPEN IN CAN BUS LINES (FRONT STEERING CONTROL ECU BRANCH LINE)
- Disconnect the cable from the negative (-) battery terminal.
- Disconnect the O16 front steering control ECU connector.
*a Front view of wire harness connector
(to Front Steering Control ECU) - Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition O16-3 (CNH1) - O16-9 (CNL1) Cable disconnected from negative (-) battery terminal 54 to 69 Ω Result
Result OK NG
Result:
NG
REPAIR OR REPLACE CAN BRANCH LINES OR CONNECTOR (FRONT STEERING CONTROL ECU)
Result:
OK
See step 2
- CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)
- Disconnect the A56 front steering control ECU connector.
*a Front view of wire harness connector
(to Front Steering Control ECU) - Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition A56-1 (PGND) - Body ground Cable disconnected from negative (-) battery terminal Below 1 Ω O16-13 (PGD2) - Body ground Cable disconnected from negative (-) battery terminal Below 1 Ω - Reconnect the cable to the negative (-) battery terminal.
- Measure the voltage according to the value(s) in the table below.
*a Front view of wire harness connector
(to Front Steering Control ECU)Standard Voltage
Tester Connection Condition Specified Condition A56-2 (PIG) - Body ground Always 11 to 14 V O16-4 (IG) - Body ground Engine switch on (IG) 11 to 14 V O16-7 (+BI) - Body ground Always 11 to 14 V Result
Result OK NG
Result:
OK
REPLACE FRONT STEERING CONTROL ECU. Refer to REMOVAL [09/2014 - ]
Result:
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)
- Disconnect the A56 front steering control ECU connector.