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) |
|
Does not come on |
DTC stored |
SAE Code: U0129 |
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
The TCM and engine stop and start ECU send and receive signals via CAN communication.
If a communication error occurs between the TCM and engine stop and start ECU,
the TCM stores this
Transmission Control Switch Circuit
DESCRIPTION
After moving the shift lever to M, it is possible to change the shift range between
M1 and M10 using the shift lever. Moving the shift lever to "+" once raises the
shift ran
ECU Power Source Circuit
DESCRIPTION
When the ignition switch is ON, auxiliary battery voltage is applied to terminal
MREL of the ECM through the coil of the EFI-MAIN relay. This causes the EFI-MAIN
relay to close, which
SEE MORE:
Removal
REMOVAL CAUTION / NOTICE / HINT COMPONENTS (REMOVAL)
Procedure Part Name Code
1 CAM TIMING OIL CONTROL SOLENOID ASSEMBLY
15370 -
- -
2 CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY (EXHAUST CAMSHAFT TIMING GEAR BOLT ASSEMBLY)
135A0B
Terminals Of Ecu
TERMINALS OF ECU HYBRID VEHICLE CONTROL ECU
Connector Code Terminal No.
Symbol Terminal Description
I249 1
E1 ECU ground
2 -
- 3
SMRB System main relay operation signal output (SMRB)
4 M
Transmission control in
