MONITOR DESCRIPTION
The ECM and skid control ECU (brake booster with master cylinder assembly) send and receive signals via CAN communication.
If a communication error occurs between the ECM and skid control ECU (brake booster with master cylinder assembly), the ECM illuminates the MIL and stores this DTC.
DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | Memory | Note |
---|---|---|---|---|---|---|
U012987 | Lost Communication with Brake System Control Module Missing Message | All of the following conditions are met for 4.98 seconds or more (1 trip detection logic):
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| Comes on | DTC stored | SAE Code: U0129 |
MONITOR STRATEGY
Related DTCs | U0129: Lost communication with brake system control module |
Required Sensors/Components (Main) | ECM |
Required Sensors/Components (Related) | - |
Frequency of Operation | Continuous |
Duration | 4.98 seconds |
MIL Operation | Immediate |
Sequence of Operation | None |
TYPICAL ENABLING CONDITIONS
Monitor runs whenever the following DTCs are not stored | None |
Both of the following conditions are met | - |
Auxiliary battery voltage | 10 V or higher |
Power switch | On (IG) |
TYPICAL MALFUNCTION THRESHOLDS
Communication signal | Lost communication with brake system control module |
CONFIRMATION DRIVING PATTERN
HINT:
Click here
Click here
HINT:
Techstream Display | Description |
---|---|
NORMAL |
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ABNORMAL |
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INCOMPLETE |
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HINT:
The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.
CAUTION / NOTICE / HINT
NOTICE:
Click here
(Select Powertrain in Health Check and then check the time stamp data.)
Click here
Click here
HINT:
Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.
PROCEDURE
1. | GO TO CAN COMMUNICATION SYSTEM |
(a) Refer to the CAN Communication System.
Click here
NEXT | END |