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PROCEDURES FOR DETERMINING THE LOCATION OF A MALFUNCTION

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## System Wiring Diagram

## PCM

1. Check the display of DTC U0121 or U0155 or both, using the WDS or equivalent. (See DTC TABLE [MULTIPLEX COMMUNICATION SYSTEM]..)

2. Referring to the following table, determine the malfunctioning part of the CAN system.

X: Normal
-: Communication error

Module | Communication status | Malfunction location
--- | --- | ---
ABS HU/CM | Instrument cluster
PCM | - | - | • Wiring harness A • PCM
- | X | • Wiring harness B • ABS HU/CM
X | - | • Wiring harness C • Instrument cluster

## ABS HU/CM

  Note

  • There is no service code data monitor in the ABS HU/CM that determines signal quality between it and the instrument cluster. Due to this, determine the malfunction location using the data monitor on the instrument cluster side.

1. Check the display of DTC U2523 or both, using the WDS or equivalent. (See DTC TABLE [MULTIPLEX COMMUNICATION SYSTEM].)

2. Referring to the following table, determine the malfunctioning part of the CAN system.

X: Normal
-: Communication error

Module | Communication status | Malfunction location
--- | --- | ---
PCM | Instrument cluster
ABS HU/CM | - | - | • Wiring harness B • ABS HU/CM
- | X | • Wiring harness A • PCM
X | - | • Wiring harness C • Instrument cluster

## Instrument Cluster

1. Access and monitor the "PCM MSG" and "ABS MSG" of the PID using the WDS or equivalent.

2. Referring to the PID/DATA MONITOR, confirm the display status of the PID. (See PID/DATA MONITOR TABLE.)

3. Referring to the following table, determine the malfunctioning part of the CAN system.

X: Normal
-: Communication error

Module | Communication status | Malfunction location
--- | --- | ---
PCM | ABS HU/CM
Instrument cluster | - | - | • Wiring harness C • Instrument cluster
- | X | • Wiring harness A • PCM
X | - | • Wiring harness B • ABS HU/CM