Lexus ES: ECM Communication Stop Mode
DESCRIPTION
Detection Item | Symptom | Trouble Area |
ECM Communication Stop Mode | Any of the following conditions are met: | -
ECM main line or connector
-
ECM branch line or connector
-
Power source circuit of ECM
-
ECM ground circuit
-
ECM
|
WIRING DIAGRAM
CAUTION / NOTICE / HINT
CAUTION:
When performing the confirmation driving pattern, obey all speed limits and traffic laws.
HINT:
-
Before disconnecting related connectors for inspection, push in on each connector body to check that the connector is not loose or disconnected.
-
When a connector is disconnected, check that the terminals and connector body are not cracked, deformed or corroded.
PROCEDURE
1. | CHECK FOR OPEN IN CAN BUS LINES (ECM MAIN LINE AND BRANCH LINE) |
(a) Disconnect the cable from the negative (-) auxiliary battery terminal.
(b) Disconnect the A26 ECM connector.
(c) Measure the resistance according to the value(s) in the table below. Standard Resistance: Tester Connection | Condition | Specified Condition | A26-7 (CAN+) - A26-17 (CAN-) | Cable disconnected from negative (-) auxiliary battery terminal | 54 to 69 Ω | A26-8 (CANH) - A26-18 (CANL) | Cable disconnected from negative (-) auxiliary battery terminal | 108 to 132 Ω | | | *a | Front view of wire harness connector (to ECM) | | |
Result | Proceed to |
OK | A |
NG (No. 2 junction connector main line) | B |
NG (No. 2 CAN junction connector branch line) | C |
B | | REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (ECM) |
C | | REPAIR OR REPLACE CAN BRANCH LINES OR CONNECTOR (ECM) |
A | | |
2. | CHECK ECM POWER SOURCE CIRCUIT |
(a) Check the ECM power source circuit.
Click here
NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT) |
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