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

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
Module	DSC HU/CM ABS HU/CM	TCM	Instrument cluster	Malfunction location
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
Module	DSC HU/CM ABS HU/CM	TCM	Instrument cluster	Malfunction location
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
Module	PCM	Malfunction location
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
Module	PCM	TCM	Instrument cluster	Malfunction location
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
Module	PCM	TCM	Instrument cluster	Malfunction location
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
Module	PCM	TCM	Keyless control module	Instrument cluster	Malfunction location
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
Module	PCM	Instrument cluster	Malfunction location
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
Module	PCM	Instrument cluster	Power retractable hardtop control module	Malfunction location
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
Module	DSC HU/CM	Malfunction location
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
Module	DSC HU/CM	Malfunction location
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
Module	PCM	TCM	DSC HU/CM ABS HU/CM	Keyless control module	Malfunction location
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
Module	PCM	TCM	DSC HU/CM ABS HU/CM	Keyless control module	Malfunction location
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.

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 M-MDS.

5. Verify if the CAN system related DTCs are displayed using the M-MDS.

If the same following DTCs are present, replace the malfunctioning module.

U0073 (PCM, TCM, DSC HU/CM, ABS HU/CM, keyless control module, instrument cluster, power retractable hardtop control module)

U2516 (steering angle sensor)

If other DTC is present, perform the appropriate DTC inspection. (See DTC TABLE [MULTIPLEX COMMUNICATION SYSTEM].)

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