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2008 - MX-5 - Body and Accessories

PROCEDURES FOR DETERMINING THE LOCATION OF A MALFUNCTION [MULTIPLEX COMMUNICATION SYSTEM]

System Wiring Diagram

PCM

1. Inspect the display of DTC U0101, U0121 and/or U0155, using the M-MDS. (See DTC TABLE [MULTIPLEX COMMUNICATION SYSTEM].)
2. Referring to the following table, determine the malfunctioning part of the CAN system.
Without power retractable hardtop×: Normal—: Communication error

Module

Communication status

Malfunction location

DSC HU/CM

ABS HU/CM

TCM

Instrument cluster

PCM

  • Wiring harness A

  • PCM

×

×

  • Wiring harness C

  • TCM

×

×

  • Wiring harness B

  • DSC HU/CM or ABS HU/CM

×

×

  • Wiring harness D

  • Wiring harness F

  • Wiring harness H

  • Instrument cluster


With power retractable hardtop×: Normal—: Communication error

Module

Communication status

Malfunction location

DSC HU/CM

ABS HU/CM

TCM

Instrument cluster

PCM

  • Wiring harness A

  • PCM

×

×

  • Wiring harness C

  • TCM

×

×

  • Wiring harness B

  • DSC HU/CM or ABS HU/CM

×

×

  • Wiring harness D

  • Wiring harness E

  • Wiring harness G

  • Wiring harness H

  • Wiring harness J

  • Wiring harness K

  • Wiring harness M

  • Instrument cluster


TCM

1. Inspect the display of DTC U0100 using the M-MDS. (See DTC TABLE [MULTIPLEX COMMUNICATION SYSTEM].)
2. Referring to the following table, determine the malfunctioning part of the CAN system.
×: Normal—: Communication error

Module

Communication status

Malfunction location

PCM

TCM

  • Wiring harness A

  • Wiring harness C

  • TCM

  • PCM


DSC HU/CM or ABS HU/CM

1. Inspect the display of DTC U0100 (DSC), U0101 (DSC), U0155 (DSC), U1900 and/or U2023, using the M-MDS. (See DTC TABLE [MULTIPLEX COMMUNICATION SYSTEM].)
2. Referring to the following table, determine the malfunctioning part of the CAN system.
Without power retractable hardtop×: Normal—: Communication error

Module

Communication status

Malfunction location

PCM

TCM

Instrument cluster

DSC HU/CM or ABS HU/CM

  • Wiring harness B

  • DSC HU/CM or ABS HU/CM

×

×

  • Wiring harness C

  • TCM

×

×

  • Wiring harness A

  • PCM

×

×

  • Wiring harness D

  • Wiring harness F

  • Wiring harness H

  • Instrument cluster


With power retractable hardtop×: Normal—: Communication error

Module

Communication status

Malfunction location

PCM

TCM

Instrument cluster

DSC HU/CM or ABS HU/CM

  • Wiring harness B

  • DSC HU/CM or ABS HU/CM

×

×

  • Wiring harness C

  • TCM

×

×

  • Wiring harness A

  • PCM

×

×

  • Wiring harness D

  • Wiring harness E

  • Wiring harness G

  • Wiring harness H

  • Wiring harness J

  • Wiring harness K

  • Wiring harness M

  • Instrument cluster


Power Retractable Hardtop Control Module

1. Inspect the display of DTC U0100, U0101 and/or U2197, using the M-MDS. (See DTC TABLE [MULTIPLEX COMMUNICATION SYSTEM].)
2. Referring to the following table, determine the malfunctioning part of the CAN system.
×: Normal—: Communication error

Module

Communication status

Malfunction location

PCM

TCM

Keyless control module

Instrument cluster

Power retractable hardtop control module

  • Wiring harness F

  • Power retractable hardtop control module

×

×

×

  • Wiring harness A

  • PCM

×

×

×

  • Wiring harness C

  • PCM


Keyless Control Module

1. Inspect the display of DTC U0100, U0323 and/or U2023 using the M-MDS.

(See DTC TABLE [MULTIPLEX COMMUNICATION SYSTEM].)

2. Referring to the following table, determine the malfunctioning part of the CAN system.
Without power retractable hardtop×: Normal—: Communication error

Module

Communication status

Malfunction location

PCM

Instrument cluster

Keyless control module

  • Wiring harness E

  • Keyless control module

×

  • Wiring harness A

  • Wiring harness D

  • PCM

×

  • Wiring harness F

  • Wiring harness H

  • Instrument cluster


With power retractable hardtop×: Normal—: Communication error

Module

Communication status

Malfunction location

PCM

Instrument cluster

Power retractable hardtop control module

Keyless control module

  • Wiring harness I

  • Keyless control module

×

×

  • Wiring harness A

  • Wiring harness D

  • Wiring harness E

  • PCM

×

×

  • Wiring harness J

  • Wiring harness K

  • Wiring harness M

  • Instrument cluster

×

×

  • Wiring harness F

  • Keyless control module


Steering Angle Sensor

1. Inspect the display of DTC U1900 using the M-MDS. (See DTC TABLE [MULTIPLEX COMMUNICATION SYSTEM].)
2. Referring to the following table, determine the malfunctioning part of the CAN system.
Without power retractable hardtop×: Normal—: Communication error

Module

Communication status

Malfunction location

DSC HU/CM

Steering Angle Sensor

  • Wiring harness B

  • Wiring harness D

  • Wiring harness F

  • Wiring harness G

  • DSC HU/CM

  • Steering Angle Sensor


With power retractable hardtop×: Normal—: Communication error

Module

Communication status

Malfunction location

DSC HU/CM

Steering Angle Sensor

  • Wiring harness B

  • Wiring harness D

  • Wiring harness E

  • Wiring harness G

  • Wiring harness H

  • Wiring harness J

  • Wiring harness K

  • Wiring harness L

  • DSC HU/CM

  • Steering Angle Sensor


Instrument Cluster

1. Inspect the display of DTC U0100, U0101, U0121, and/or U0214, using the M-MDS. (See DTC TABLE [MULTIPLEX COMMUNICATION SYSTEM].)
2. Referring to the following table, determine the malfunctioning part of the CAN system.
Without power retractable hardtop×: Normal—: Communication error

Module

Communication status

Malfunction location

PCM

TCM

DSC HU/CM

ABS HU/CM

Keyless control module

Instrument cluster

  • Wiring harness F

  • Wiring harness H

  • Instrument cluster

×

  • Wiring harness D

×

×

×

  • Wiring harness A

  • PCM

×

×

×

  • Wiring harness C

  • TCM

×

×

×

  • Wiring harness B

  • DSC HU/CM or ABS HU/CM

×

×

×

  • Wiring harness E

  • Keyless control module


With power retractable hardtop×: Normal—: Communication error

Module

Communication status

Malfunction location

PCM

TCM

DSC HU/CM

ABS HU/CM

Keyless control module

Instrument cluster

  • Wiring harness J

  • Wiring harness K

  • Wiring harness M

  • Instrument cluster

×

  • Wiring harness D

  • Wiring harness E

  • Wiring harness G

  • Wiring harness H

×

×

×

  • Wiring harness A

  • PCM

×

×

×

  • Wiring harness C

  • TCM

×

×

×

  • Wiring harness B

  • DSC HU/CM or ABS HU/CM

×

×

×

  • Wiring harness I

  • Keyless control module


Repair Procedure

1. Inspect the connector of malfunctioning module.
2. Inspect the malfunctioning wiring harnesses as follow:
3. Make sure to reconnect all disconnected connectors.
4. Clear the CAN system related DTCs using the M-MDS.
5. Verify if the CAN system related DTCs are displayed using the M-MDS.


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