#
MULTIPLEX COMMUNICATION SYSTEM

id0902e6830400

## Outline

• If the controller area network (CAN) system is malfunctioning, read the DTCs of the following modules, using the SST (WDS or equivalent) to determine the malfunctioning system.

  - PCM
  - TCM
  - ABS (ABS/TCS) HU/CM
  - DSC HU/CM
  - 4WD control module
  - Keyless control module
  - Instrument cluster

## Flowchart

• Use the following flowchart to verify the cause of the trouble.

STEP | INSPECTION | ACTION
--- | --- | ---
1 | INSPECT DTC INDICATION • Using the WDS or equivalent, inspect if DTCs are displayed for the following module: - PCM - TCM - ABS (ABS/TCS) HU/CM - DSC HU/CM - 4WD control module - Keyless control module - Instrument cluster • Are any DTCs displayed? | Yes | Go to the next step.
No | Go to Step 5.
2 | INSPECT CAN SYSTEM-RELATED DTC • Are any DTCs other than the following displayed? - U0073 - U0100 - U0101 - U0114 - U0121 - U0155 - U0323 - U0516 - U1900 - U2023 - U2511 - U2516 | Yes | Repair the malfunctioning part by following the related DTC inspection. Go to the next step.
No | Go to the next step.
3 | INSPECT CAN SYSTEM-RELATED DTC • Are any of the following DTCs displayed? - PCM: U0073, U0101, U0121, U0155 - TCM: U0073, U0100 - ABS (ABS/TCS) HU/CM, DSC HU/CM: U0073, U0100, U0101, U0114, U0155, U2511 - 4WD control module: U0073, U0100, U0121 - Keyless control module: U0073, U0100, U0323, U2023 - Instrument cluster: U1900, U2516 | Yes | Repair the malfunctioning part by following the DTC inspection. Go to the next step.
No | Troubleshooting completed.
4 | VERIFY TROUBLESHOOTING COMPLETED • Clear the DTC from the CAN system-related modules using the WDS or equivalent. • Start the engine. • Are any of the CAN related DTCs displayed? | Yes | Go back to Step 3.
No | Troubleshooting completed.
5 | INSPECT COMMUNICATION CONDITION • Is there a response from the following modules? - PCM - TCM - ABS (ABS/TCS) HU/CM - DSC HU/CM - 4WD control module - Keyless control module - Instrument cluster | Yes | Troubleshooting completed.
No | Go to the next step.
6 | INSPECT MODULES THAT DO NOT RESPOND • Inspect the power supply and the ground circuit for any units that do not respond. • Are they normal? | Yes | Go to the next step.
No | Repair the malfunctioning part, then go back to Step 1.
7 | INSPECT CONNECTOR AND WIRING HARNESS BETWEEN MODULES THAT DO NOT RESPOND AND DLC-2 • Turn the ignition switch to the LOCK position. • Inspect the wiring harness and connector between any module that does not respond and the DLC-2. PCM (except MZR-CD (RF Turbo))-DLC-2 2U-F 2R-E PCM (MZR-CD (RF Turbo))-DLC-2 12-F 39-E TCM (JA5AX-EL)-DLC-2 2J-F 2M-E TCM (FS5A-EL)-DLC-2 2W-F 2X-E ABS (ABS/TCS) HU/CM-DLC-2 • O-F • R-E DSC HU/CM-DLC-2 • AG-F • AF-E 4WD control module-DLC-2 • G-F • H-E Keyless control module-DLC-2 3AA-F 3Z-E Instrument cluster-DLC-2 2X-F 2W-E | Yes | Go to the next step.
No | Repair the malfunctioning part, then go back to Step 1.
8 | INSPECT WIRING HARNESS • Turn the ignition switch to the ON position (Engine off). • Measure the voltage between the following terminals. - DLC-2 terminals F and E • Is the voltage 2.0-3.0 V? | Yes | Go to the next step.
No | Go to Step 12.
9 | INSPECT WIRING HARNESS • Turn the ignition switch to the LOCK position. • Measure the resistance between the following terminals. - DLC-2 terminals F and E • Is the resistance 59-65 ohms? | Yes | Replace the modules that do not respond, then go back to Step 1.
No | Go to the next step.
10 | INSPECT PCM • Disconnect the PCM connector. • Measure the resistance between following terminals. - PCM terminals 2U and 2R (part-side) (except MZR-CD (RF Turbo)) - PCM terminals 13 and 19 (part-side) (MZR-CD (RF Turbo)) • Is the resistance 118-130 ohms? | Yes | Go to the next step.
No | Replace the PCM, then go to the next step.
11 | INSPECT INSTRUMENT CLUSTER • Disconnect the instrument cluster connector. • Measure the resistance between the following terminals. - Instrument cluster terminals 2X and 2W (part-side) • Is the resistance 118-130 ohms? | Yes | Go to next step.
No | Replace the instrument cluster, then go to the next step.
12 | CLASSIFY WIRING HARNESS MALFUNCTION OR MODULE MALFUNCTION • Turn the ignition switch to the LOCK position. • Disconnect the connector of any unit that does not respond. (If there are two or more units that do not respond, disconnect only one of the units.) • Turn the ignition switch to the ON position. • Measure the voltage between the following terminals. - DLC-2 terminals F and E • Is voltage 2.0-3.0 V? | Yes | Go to the next step.
No | Retry this step with other module connector disconnected. If all units that do not respond are disconnected, go to Step 14.
13 | INSPECT WIRING HARNESS OF ANY UNIT THAT DOES NOT RESPOND • Turn the ignition switch to the LOCK position. • Inspect for continuity between the following connector terminals of any disconnected unit. PCM (except MZR-CD (RF Turbo)) 2U-other terminals 2R-other terminals PCM (MZR-CD (RF Turbo)) 13-other terminals 39-other terminals TCM (JA5AX-EL) 2J-other terminals 2M-other terminals TCM (FS5A-EL) 2W-other terminals 2X-other terminals ABS (ABS/TCS) HU/CM • O-other terminals • R-other terminals DSC HU/CM • AG-other terminals • AF-other terminals 4WD control module • G-other terminals • H-other terminals Keyless control module 3AA-other terminals 3Z-other terminals Instrument cluster 2X-other terminals 2W-other terminals Is there continuity? | Yes | Repair or replace the wiring harness, then go back to Step 1.
No | Replace the disconnected unit, then go back to Step 1.
14 | INSPECT KLN RELATED WIRING HARNESS • Inspect the related wiring harnesses (KLN) for the short circuit (to power supply or ground). • Is the wiring harness normal? | Yes | If wiring harness is normal but ABS (ABS/TCS) HU/CM or DSC HU/CM does not respond, inspect ABS (ABS/TCS) HU/CM or DSC HU/CM. Go back to Step 1.
No | Repair or replace the wiring harness, then go back to Step 1.
15 | INSPECT CAN RELATED WIRING HARNESS • Inspect the related wiring harnesses (CAN_L and/or CAN_H) for the short circuit (to power supply or ground). • Is the wiring harness normal? | Yes | Go back to Step 1.
No | Replace the wiring harness, then go back to Step 1.