Toyota Corolla Cross: ECM Communication Stop Mode
DESCRIPTION
Detection Item
|
Symptom
|
Trouble Area
|
ECM Communication Stop Mode
|
Communication stop for "ECM (Engine)" is indicated on the "Communication
Bus Check" screen of the GTS.
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.
NOTICE:
- Because the order of diagnosis is important to allow correct diagnosis,
make sure to begin troubleshooting using How to Proceed with Troubleshooting
when CAN communication system related DTCs are output.
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- Before measuring the resistance of the CAN bus, turn the ignition switch
off and leave the vehicle for 1 minute or more without operating the key or
any switches, or opening or closing the doors. After that, disconnect the cable
from the negative (-) auxiliary battery terminal and leave the vehicle for 1
minute or more before measuring the resistance.
- After the ignition switch is turned off, there may be a waiting time before
disconnecting the negative (-) auxiliary battery terminal.
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- When disconnecting and reconnecting the auxiliary battery.
HINT:
When disconnecting and reconnecting the auxiliary battery, there is an automatic
learning function that completes learning when the respective system is used.
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- Some parts must be initialized and set when replacing or removing and installing
parts.
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- After performing repairs, perform the DTC check procedure and confirm that
the DTCs are not output again.
DTC check procedure: Turn the ignition switch to ON and wait for 1 minute
or more. Then operate the suspected malfunctioning system and drive the vehicle
at 60 km/h (37 mph) or more for 5 minutes or more.
- After the repair, perform the CAN bus check and check that all the ECUs
and sensors connected to the CAN communication system are displayed as normal.
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- Before replacing the ECM, refer to Registration.
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- Inspect the fuses for circuits related to this system before performing
the following procedure.
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 (-) auxiliary battery terminal.
(b) Disconnect the ECM connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
|
Condition
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Specified Condition
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A47-8 (CANH) - A47-18 (CANL)
|
Cable disconnected from negative (-) auxiliary 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
OK |
|
REPLACE ECM
|
NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)
|
READ NEXT:
DESCRIPTION
Detection Item
Symptom
Trouble Area
Transmission Control ECU Communication Stop Mode
Communication stop for "TCM" is
DESCRIPTION
Detection Item
Symptom
Trouble Area
Main Body ECU Communication Stop Mode
Communication stop for "Main Body" is indi
DESCRIPTION
Detection Item
Symptom
Trouble Area
Combination Meter ECU Communication Stop Mode
Communication stop for "Combination Met
SEE MORE:
MONITOR DESCRIPTION The ECM uses air fuel ratio sensors mounted in front of and behind the Three-Way Catalytic Converter (TWC) to monitor its efficiency.
The first sensor, the air fuel ratio sensor (sensor 1), sends pre-catalyst information to the ECM. The second sensor, the air fuel ratio sensor
INSPECTION
PROCEDURE
1. INSPECT FRONT NO. 1 SPEAKER ASSEMBLY LH (w/o Stereo Component Amplifier)
(a) With the front No. 1 speaker assembly LH installed, check that
there is no looseness or other abnormalities.
(b) Check that there is no foreign matter in the front No. 1 speaker
assembly LH,