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Reading and Clearing Diagnostic Trouble Codes

PROCEDURES FOR DETERMINING THE LOCATION OF A MALFUNCTION

MULTIPLEX COMMUNICATION SYSTEM

Outline

- If the controller area network (CAN) system is malfunctioning, read the DTCs of the following modules, using the WDS or equivalent to determine the malfunctioning system.
- PCM
- EHPAS control module
- TPMS control module
- ABS HU/CM
- Instrument cluster
- SAS control module
- Audio unit (base module)
- PJB





System Wiring Diagram:




System Wiring Diagram

PCM

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




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

EHPAS Control Module
1. Inspect the display of DTC U0100 and/or U2023, using the WDS or equivalent. (See DTC TABLE [MULTIPLEX COMMUNICATION SYSTEM].)




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

TPMS Control Module
1. Inspect the display of DTC U1900, using the WDS or equivalent. (See DTC TABLE [MULTIPLEX COMMUNICATION SYSTEM].)




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

ABS HU/CM
1. Inspect the display of DTC U1900, U2202 and/or U2523, using the WDS or equivalent. (See DTC TABLE [MULTIPLEX COMMUNICATION SYSTEM].)




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

Instrument Cluster
1. Inspect the display of DTC U0100, U0121, U0127 and/or U0131 using the WDS or equivalent. (See DTC TABLE [MULTIPLEX COMMUNICATION SYSTEM].)




2. Referring to the table, determine the malfunctioning part of the CAN system.
3. Inspect the display of DTC U0140, U0151 and/or U0184, using the WDS or equivalent. (See DTC TABLE [MULTIPLEX COMMUNICATION SYSTEM].)




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

SAS Control Module
1. Inspect the display of DTC U1900 using the WDS or equivalent. (See DTC TABLE [MULTIPLEX COMMUNICATION SYSTEM].)




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

PJB
1. Inspect the display of DTC U1900 using the WDS or equivalent. (See DTC TABLE [MULTIPLEX COMMUNICATION SYSTEM].)




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

Repair Procedure
1. Inspect the connector of malfunctioning module.
- If there is any malfunction, repair or replace the connector.
2. Inspect the malfunctioning wiring harnesses as follow:
- If there is any malfunction, repair or replace the wiring harnesses.
- If there is no malfunction, replace the malfunctioning module.
- Short to GND
- Short to power supply
- Twisted pair short each other
- Open circuit

3. Make sure to reconnect all disconnected connectors.
4. Clear the CAN system related DTCs using the WDS or equivalent.
5. Verify if the CAN system related DTCs are displayed using the WDS or equivalent.
- If the same following DTCs are present, replace the malfunctioning module.
- U0073 (PCM, EHPAS control module, instrument cluster, SAS control module)
- U0516 (TPMS control module)
- U1900(PJB)
- U2012 (ABS HU/CM)
- U2516 (Instrument cluster)
- If other DTC is present, perform the appropriate DTC inspection. (See DTC TABLE [MULTIPLEX COMMUNICATION SYSTEM].) Diagnostic Trouble Code Descriptions
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