Toyota Corolla Cross: Transmission Control ECU Communication Stop Mode
DESCRIPTION
Detection Item
|
Symptom
|
Trouble Area
|
Transmission Control ECU Communication Stop Mode
|
Communication stop for "TCM" is indicated on the "Communication Bus Check"
screen of the GTS.
|
- TCM branch line or connector
- Power source circuit of TCM
- TCM ground circuit
- TCM
|
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.
Click here
- 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 (TCM BRANCH LINE)
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(a) Disconnect the cable from the negative (-) auxiliary battery terminal.
(b) Disconnect the TCM 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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C80-15 (CANH) - C80-16 (CANL)
|
Cable disconnected from negative (-) auxiliary battery terminal
|
54 to 69 Ω
|
|
|
*a
|
Front view of wire harness connector
(to TCM)
|
|
|
NG |
|
REPAIR OR REPLACE CAN BRANCH LINES OR CONNECTOR (TCM)
|
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
|
C80-2 (E1) - Body ground
|
Cable disconnected from negative (-) auxiliary battery terminal
|
Below 1 Ω
|
|
|
*a
|
Front view of wire harness connector
(to TCM)
|
|
|
(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
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Specified Condition
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C80-1 (+B) - Body ground
|
Ignition switch ON
|
11 to 14 V
|
C80-41 (IGSW) - Body ground
|
Ignition switch ON
|
11 to 14 V
|
OK |
|
REPLACE TCM
- for 2WD: Click here
- for AWD: Click here
|
NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)
|
READ NEXT:
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
DESCRIPTION
Detection Item
Symptom
Trouble Area
Certification ECU Communication Stop Mode
Communication stop for "Certification (Smar
SEE MORE:
DESCRIPTION Refer to DTC P032511. Click here
HINT: When DTC P032515 is stored, the ECM enters fail-safe mode. During fail-safe mode, the ignition timing is delayed to its maximum retardation. Fail-safe mode continues until the ignition switch is turned off.
DTC No. Detection Item
DT
DESCRIPTION The ECM constantly generates a 5 V power source voltage from the auxiliary battery voltage supplied to the +B, +B2 (BATT) terminals to operate the microprocessor. The ECM also provides this power to the sensors through the VC output circuit.
When the VC circuit has a short circuit, th