On-Board Diagnostic - (Multiplex Communication System): Other Mazda MX-5 NC рестайлинг

FOREWORD [MULTIPLEX COMMUNICATION SYSTEM]

1. If the CAN system is considered to be the cause of the malfunction based on the repair order form and the malfunctioning symptom, follow the «TROUBLESHOOTING PROCEDURE»(ref-430299-S22683969572011101700000) . DTCs are also output due to a control module or sensor malfunction, or incorrect power supply. Verify the output DTCs and first inspect the DTCs not shown in «DTC TABLE [MULTIPLEX COMMUNICATION SYSTEM]»(ref-430299-S20190229272011101700000) .
2. If there is an open circuit in the communication lines, it is possible that signal error DTCs may be output in addition to communication error DTCs. Perform «DETERMINING MALFUNCTIONING PART (HS-CAN) [MULTIPLEX COMMUNICATION SYSTEM]»(ref-430299-S14931688962011101700000) , «DETERMINING MALFUNCTIONING PART (MS-CAN) [MULTIPLEX COMMUNICATION SYSTEM]»(ref-430299-S42455382392011101700000) if the communication error and signal error DTCs are output simultaneously.

Scheme 2

*1 : DTC TABLE [MULTIPLEX COMMUNICATION SYSTEM]

*2 : DTC U0073, U1900 [MULTIPLEX COMMUNICATION SYSTEM]

*3 : DTC 16: ER12 [MULTIPLEX COMMUNICATION SYSTEM]

*4 : DETERMINING MALFUNCTIONING PART (HS-CAN) [MULTIPLEX COMMUNICATION SYSTEM] / DETERMINING MALFUNCTIONING PART (MS-CAN) [MULTIPLEX COMMUNICATION SYSTEM]

*5 : M-MDS AND VEHICLE NOT COMMUNICATING [MULTIPLEX COMMUNICATION SYSTEM]

DETERMINING MALFUNCTIONING PART (HS-CAN) [MULTIPLEX COMMUNICATION SYSTEM]

1. Verify the CAN system-related module DTCs and the failed module using the M-MDS.
2. Look for a DTC display pattern and failed module display pattern in tandem which match. NOTE: A hyphen "-" in the DTC output pattern table indicates that the DTC may be displayed depending on the malfunction detection conditions. If only an "x" is indicated, it means the DTC will not be displayed. If any of the following DTCs is displayed alone, perform the applicable DTC inspection. (See «DTC TABLE [MULTIPLEX COMMUNICATION SYSTEM]»(ref-430299-S20190229272011101700000) ) ABS HU/CM: U2023 DSC HU/CM: U2023 Keyless control module: U2023 Instrument cluster: U2023
3. Refer to the matching tandem diagnostic results (A to J) and inspect the possible cause and inspection item.
4. Perform the DTC inspection after the repair procedure. If any DTC is displayed, return to «FOREWORD [MULTIPLEX COMMUNICATION SYSTEM]»(ref-430299-S24271354162011101700000) .

Possible cause

1. Connector terminal disconnection, poor contact, damage, deformation, corrosion
2. Open circuit in wiring harness between PCM and branch A
3. PCM malfunction

Scheme 3

1. Connector terminal disconnection, poor contact, damage, deformation, corrosion
2. Open circuit in wiring harness between TCM and branch A
3. TCM malfunction

Scheme 4

1. Connector terminal disconnection, poor contact, damage, deformation, corrosion
2. Open circuit in wiring harness between ABS HU/CM and branch A
3. ABS HU/CM malfunction

Scheme 5

1. Connector terminal disconnection, poor contact, damage, deformation, corrosion
2. Open circuit in wiring harness between DSC HU/CM and branch A
3. DSC HU/CM malfunction

Scheme 6

1. Connector terminal disconnection, poor contact, damage, deformation, corrosion
2. Open circuit in wiring branch A and connector C-08
3. Open circuit in wiring connector C-08 and branch B
4. Connector C-08 malfunction

Scheme 7

1. Connector terminal disconnection, poor contact, damage, deformation, corrosion
2. Open circuit in wiring power retractable hardtop control module and branch B
3. Power retractable hardtop control module malfunction

Scheme 8

1. Connector terminal disconnection, poor contact, damage, deformation, corrosion
2. Open circuit in wiring harness between branch B and connector C-08
3. Open circuit in wiring harness between connector C-08 and connector C-05
4. Open circuit in wiring harness between connector C-05 and branch C
5. Connector C-08 malfunction
6. Connector C-05 malfunction

Scheme 9

1. Connector terminal disconnection, poor contact, damage, deformation, corrosion
2. Open circuit in wiring harness between keyless control module and branch C
3. Keyless control module malfunction

Scheme 10

1. Connector terminal disconnection, poor contact, damage, deformation, corrosion
2. Open circuit in wiring harness between branch C and connector C-11
3. Open circuit in wiring harness between connector C-11 and branch D
4. Connector C-11 malfunction

Scheme 11

1. Connector terminal disconnection, poor contact, damage, deformation, corrosion
2. Open circuit in wiring harness between instrument cluster and branch D
3. Instrument cluster malfunction

Scheme 12

DETERMINING MALFUNCTIONING PART (MS-CAN) [MULTIPLEX COMMUNICATION SYSTEM]

1. Verify the following for the modules related to the CAN system. Communication error DTCs The operation condition of the hands-free telephone (HF/TEL) system. The operation condition of the SIRIUS satellite radio system.
2. Look for a DTC display pattern and system operation status in tandem which match. NOTE: A hyphen (-) in the DTC output pattern cell indicates that the DTC may or may not be displayed depending on the malfunction detection conditions. If it is not displayed, the malfunctioning location can be determined by checking the crosses (x) and asterisks (*).
3. Refer to the matching tandem diagnostic results (A to C) and inspect the possible cause and inspection item.
4. Perform the DTC inspection after the repair procedure. If any DTC is displayed, return to «FOREWORD [MULTIPLEX COMMUNICATION SYSTEM]»(ref-430299-S24271354162011101700000) .

1. Connector terminal disconnection, poor contact, damage, deformation, corrosion
2. Open circuit in wiring harness between audio unit and branch A
3. Open circuit in wiring harness between branch A and connector C-14
4. Open circuit in wiring harness between connector C-14 and branch B
5. Audio unit malfunction

Scheme 13

1. Connector terminal disconnection, poor contact, damage, deformation, corrosion
2. Open circuit in wiring harness between HF/TEL unit and branch B
3. HF/TEL unit malfunction

Scheme 14

1. Connector terminal disconnection, poor contact, damage, deformation, corrosion
2. Open circuit in wiring harness between SIRIUS satellite radio unit and branch B
3. SIRIUS satellite radio unit malfunction

Scheme 15

M-MDS AND VEHICLE NOT COMMUNICATING [MULTIPLEX COMMUNICATION SYSTEM]

Detection Condition

1. Possible causes of communication errors between the M-MDS and vehicle include communication circuit interruption due to an open circuit in the CAN communication wiring harness, or poor contact of connector terminals, or a BUS OFF condition due to a short circuit in the CAN communication wiring harness.

Possible Causes

1. Open circuit in wiring harness between PCM and DLC-2
2. Improper insertion of PCM, connector C-08, connector C-05, or connector C-11 damage, deformation, corrosion, or disconnection of connector terminals
3. Short circuit in wiring harness between CAN system-related module CAN_L and CAN_H lines
4. Short circuit to power supply in wiring harness between CAN system-related module
5. Short circuit to ground in wiring harness between CAN system-related module
6. Short circuit to power supply in CAN system-related module internal CAN lines
7. Short circuit to ground in CAN system-related module internal CAN lines
8. Damage, deformation, corrosion, or disconnection of DLC-2
9. PCM power supply is not normal
10. PCM ground is not normal
11. PCM internal resistance is not normal
12. CAN system-related module malfunction

Scheme 16