Lexus ES: ECM Communication Stop Mode
DESCRIPTION
Detection Item | Symptom | Trouble Area |
ECM Communication Stop Mode | Any of the following conditions are met: -
Communication stop for "ECM (Engine)" is indicated on the "Communication Bus Check" screen of the Techstream.
Click here -
Communication stop history for "ECM (Engine)" is indicated on the "Communication Bus Check (Detail)" screen of the Techstream. (The Lost Communication Time value for "ECM (Engine)" is 6 or more.)
Click here -
Communication system DTCs (DTCs that start with U) that correspond to "ECM Communication Stop Mode" in "DTC Combination Table" are output.
Click here | -
ECM main 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) |
(a) Disconnect the cable from the negative (-) battery terminal.
(b) Disconnect the A25 ECM connector.
(c) Measure the resistance according to the value(s) in the table below. Standard Resistance: Tester Connection | Condition | Specified Condition | A25-13 (CANH) - A25-26 (CANL) | Cable disconnected from negative (-) battery terminal | 108 to 132 Ω | | | *a | Front view of wire harness connector (to ECM) | | |
NG | | REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (ECM) |
OK | | |
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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