Toyota Corolla Cross: Lost Communication With Brake System Control Module Missing Message (U012987)
DESCRIPTION
The TCM receives signals from the skid control ECU via CAN communication. When DTCs indicating a CAN communication system malfunction are output, repair the CAN communication system before performing troubleshooting for each corresponding ECU or sensor.
|
DTC No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
MIL |
Memory |
Note |
|---|---|---|---|---|---|---|
|
U012987 |
Lost Communication With Brake System Control Module Missing Message |
No communication between the TCM and skid control ECU (brake actuator assembly) for 2.2 seconds or more (1-trip logic) |
|
|
DTC stored |
|
CONFIRMATION DRIVING PATTERN
HINT:
After repairs have been completed, clear the DTCs and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.
- Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
- Turn the ignition switch off and wait for 3 minutes or more.
- Turn the ignition switch to ON and turn the GTS on.
- Wait for 5 seconds or more with the ignition switch to ON.
- Enter the following menus: Powertrain / Transmission / Utility / All Readiness.
- Input the DTC: U012987.
- Check the DTC judgment result.
GTS Display
Description
NORMAL
- DTC judgment completed
- System normal
ABNORMAL
- DTC judgment completed
- System abnormal
INCOMPLETE
- DTC judgment not completed
- Perform driving pattern after confirming DTC enabling conditions
N/A
- Unable to perform DTC judgment
- Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit
HINT:
- If the judgment result shows NORMAL, the system is normal.
- If the judgment result shows ABNORMAL, the system has a malfunction.
- If the judgment result shows INCOMPLETE or N/A, perform the Confirmation Driving Pattern and check the DTC judgment result again.
CAUTION / NOTICE / HINT
NOTICE:
- Perform registration and/or initialization when parts related to the continuously
variable transaxle system are replaced.
Click here
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- Check that no DTCs are stored after performing initialization.
Click here
PROCEDURE
|
1. |
CLEAR DTC AND PERFORM ROAD TEST |
(a) Clear the DTCs.
Powertrain > Transmission > Clear DTCsHINT:
Write down the currently output DTCs before clearing them.
(b) Start the engine and drive the vehicle at a low speed.
|
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|
2. |
CHECK DTC OUTPUT (DTC U012987) |
(a) Enter the following menus:
Powertrain > Transmission > Trouble Codes(b) Read the DTCs using the GTS.
|
Result |
Proceed to |
|---|---|
|
DTC U012987 is not output |
A |
|
DTC U012987 is output |
B |
| A | .gif) |
CHECK FOR INTERMITTENT PROBLEMS Click here Click here |
| B | |
GO TO CAN COMMUNICATION SYSTEM |
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DESCRIPTION
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ECU Power Source Circuit
DESCRIPTION
When the ignition switch is turned to ON, auxiliary battery voltage is applied
to terminal MREL of the ECM through the coil of the EFI-MAIN relay. This causes
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SEE MORE:
Unlock Warning Switch
RemovalREMOVAL CAUTION / NOTICE / HINT COMPONENTS (REMOVAL)
Procedure Part Name Code
1 STEERING WHEEL POSITION
-
- -
2 LOWER STEERING COLUMN COVER
45287
- -
3 UNLOCK WARNING SWITCH ASSEMBLY
Relay
On-vehicle InspectionON-VEHICLE INSPECTION PROCEDURE
1. INSPECT NO. 1 ELECTRONIC FUEL INJECTION MAIN RELAY (EFI-MAIN NO. 1)
(a) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection Condition
Specified Condition
