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
- EPS control module
- TCM(AT)
- ABS HU/CM (with ABS)
- DSC HU/CM (with DSC)
- Instrument cluster
- Steering Angle Sensor (with DSC)
- Keyless Control Module
- TPMS Control Module

System Wiring Diagram:

System Wiring Diagram

PCM
1. Check the display of DTC U0121 and/or U0155, using the SST (WDS or equivalent).




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

EPS Control Module
1. Check the display of DTC U1900, using the SST (WDS or equivalent). Refer To U Code Charts U1900

Malfunction location
- Wiring harness 1
- Wiring harness 2
- Wiring harness 3
- Wiring harness 5
- PCM
- ABS HC/CM or DSC HU/CM
- EPS control module

ABS HU/CM or DSC HU/CM
1. Check the display of DTC U1900, using the SST (WDS or equivalent). Refer To U Code Charts U1900

Malfunction location
- Wiring harness 1
- Wiring harness 3
- Wiring harness 5
- Wiring harness 6
- Wiring harness 8
- Wiring harness 10
- Wiring harness 11
- PCM
- Steering angle sensor
- ABS HU/CM or DSC HU/CM

TCM
1. Check the display of DTC U0100, using the SST (WDS or equivalent).

Malfunction location
- Wiring harness 1
- Wiring harness 3
- Wiring harness 4
- PCM
- TCM

Keyless Control Module
1. Check the display of DTC U1900, using the SST (WDS or equivalent). Refer To U Code Charts U1900

Malfunction location
- Wiring harness 1
- Wiring harness 3
- Wiring harness 6
- Wiring harness 7
- PCM
- Keyless control module

Steering Angle Sensor

1. Check the display of DTC U1900, using the SST (WDS or equivalent). Refer To U Code Charts U1900

Malfunction location
- Wiring harness 11
- DSC HU/CM
- Steering angle sensor

Instrument Cluster
1. Access and monitor the "PCM,MSG", "EPS_MSG", "TPM_MSG", "TCM_MSG" and "ABS_MSG" of PID using the SST (WDS or equivalent).
2. Referring to the PID/DATA MONITOR, confirm the display status of the PID. (See PID/DATA MONITOR TABLE [MULTIPLEX COMMUNICATION SYSTEM].)
Monitors, Trips, Drive Cycles and Readiness Codes




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