Toyota Corolla Cross: Combination Meter ECU Communication Stop Mode
DESCRIPTION
Detection Item
|
Symptom
|
Trouble Area
|
Combination Meter ECU Communication Stop Mode
|
Communication stop for "Combination Meter" is indicated on the "Communication
Bus Check" screen of the GTS.
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|
- Combination meter assembly main line or connector
- Power source circuit of combination meter assembly
- Combination meter assembly ground circuit
- Combination meter assembly
|
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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- 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 (COMBINATION METER ASSEMBLY MAIN LINE)
|
(a) Disconnect the cable from the negative (-) auxiliary battery terminal.
(b) Disconnect the combination meter assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
|
Condition
|
Specified Condition
|
I5-31 (CANH) - I5-14 (CANL)
|
Cable disconnected from negative (-) auxiliary battery terminal
|
108 to 132 Ω
|
|
|
*a
|
Front view of wire harness connector
(to Combination Meter Assembly)
|
|
|
NG |
|
REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (COMBINATION METER
ASSEMBLY)
|
OK |
|
|
2.
|
CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)
|
(a) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
|
Condition
|
Specified Condition
|
I4-1 (EP) - Body ground
|
Cable disconnected from negative (-) auxiliary battery terminal
|
Below 1 Ω
|
I4-2 (ES) - Body ground
|
Cable disconnected from negative (-) auxiliary battery terminal
|
Below 1 Ω
|
|
|
*a
|
Front view of wire harness connector
(to Combination Meter Assembly)
|
|
|
(b) Reconnect the cable to the negative (-) auxiliary battery terminal.
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection
|
Switch Condition
|
Specified Condition
|
I4-5 (B) - Body ground
|
Always
|
11 to 14 V
|
NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)
|
OK |
|
|
3.
|
CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)
|
(a) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection
|
Condition
|
Specified Condition
|
I4-6 (IG+) - Body ground
|
Ignition switch ON
|
10.5 to 16 V
|
|
|
*a
|
Front view of wire harness connector
(to Combination Meter Assembly)
|
|
|
OK |
|
REPLACE COMBINATION METER ASSEMBLY
|
NG |
|
GO TO STOP AND START SYSTEM (BACKUP BOOST CONVERTER CIRCUIT)
|
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SEE MORE:
DESCRIPTION The cause of this malfunction may be the motor resolver.
Check the motor resolver internal resistance and the connection condition from the inverter to the resolver. Related Parts Check
Area Inspection
Wire harness and connector between the inverter and motor resolve
UTILITY
HINT:
With "All Readiness", you can check whether or not the DTC judgment
has been completed by using the GTS
You should check "All Readiness" after simulating malfunction symptoms
or for validation after finishing repairs.
ALL READINESS
(a) Clear the