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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PROBLEM SYMPTOMS TABLE HINT:
Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking the suspect
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