Home

< Previous   Next >

2008 - MX-5 - Body and Accessories

MULTIPLEX COMMUNICATION SYSTEM [MULTIPLEX COMMUNICATION SYSTEM]

Outline

Flowchart



STEP

INSPECTION

ACTION

1

INSPECT DTC INDICATION
  • Using the M-MDS, inspect if DTCs are displayed for the following module:

    • PCM

    • TCM

    • DSC HU/CM

    • ABS HU/CM

    • Power retractable hardtop control module

    • Keyless control module

    • Steering angle sensor

    • 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

    • U0121

    • U0155

    • U0207

    • U0214

    • U0323

    • U1900

    • U2023

    • U2197

    • 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

    • DSC HU/CM: U0073, U0100, U0101, U0155, U1900, U2023

    • ABS HU/CM: U0073, U1900, U2023

    • Power retractable hardtop control module: U0073, U0100, U0101, U2197

    • Keyless control module: U0073, U0100, U0207, U0323, U2023

    • Steering angle sensor: U1900, U2516

    • Instrument cluster: U0073, U0100, U0101, U0121, U0214

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 M-MDS.

  • 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

    • DSC HU/CM

    • ABS HU/CM

    • Power retractable hardtop control module

    • Keyless control module

    • Steering angle sensor

    • 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—DLC-2
    • 1AM—F

    • 1AI—E

      TCM—DLC-2
    • 1G—F

    • 1C—E

      DSC HU/CM—DLC-2
    • X—F

    • W—E

      ABS HU/CM—DLC-2
    • Z—F

    • Y—E

      Power retractable hardtop control module—DLC-2
    • 3S—F

    • 3U—E

      Keyless control module—DLC-2
    • 4AA—F

    • 4Z—E

      Steering angle sensor—DLC-2
    • E—F

    • F—E

      Instrument cluster—DLC-2
    • 1J—F

    • 1L—E

  • Is there any malfunction?

Yes

Repair the malfunctioning part, then go back to Step 1.

No

Go to the next step.

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 GND

    • DLC-2 terminals E and GND

  • 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 1AM and 1AI (part-side)

  • 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 1J and 1L (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 GND

    • DLC-2 terminals E and GND

  • 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—DLC-2
    • 1AM—other terminals

    • 1AI—other terminals

      TCM—DLC-2
    • 1G—other terminals

    • 1C—other terminals

      DSC HU/CM—DLC-2
    • X—other terminals

    • W—other terminals

      ABS HU/CM—DLC-2
    • Z—other terminals

    • Y—other terminals

      Power retractable hardtop control module—DLC-2
    • 3S—other terminals

    • 3U—other terminals

      Keyless control module—DLC-2
    • 4AA—other terminals

    • 4Z—other terminals

      Steering angle sensor—DLC-2
    • E—other terminals

    • F—other terminals

      Instrument cluster—DLC-2
    • 1J—other terminals

    • 1L—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 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

Repair or replace the wiring harness, then go back to Step 1.

No

Go back to Step 1.




< Previous   Next >
Back to Top
© 2009 Mazda North American Operations, U.S.A.