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Home >> Mazda >> 2012 >> 6 i Touring >> Repair and Diagnosis >> External Pages >> Different car >> Section 548 (On-Board Diagnostic [Multiplex Communication System)) >> DTC U0001:88, U0073:00 [Multiplex Communication System] >> Diagnostic procedure

Diagnostic procedure

WARNING: This page is about a different car, the 2009 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION:
  • When disconnecting the connector, verify that there is no looseness, damage, deformation, corrosion, or poor connection of the connector terminals.
Step Inspection Action
1 VERIFICATION BEFORE SERVICING
  • Are any DTCs, except the following, displayed?
    • U0001 88
    • U0073.00
 Yes Determine the open circuit location referring to DETERMINING MALFUNCTIONING PART (HS-CAN) [MULTIPLEX COMMUNICATION SYSTEM] .
No Go to the next step.
2 INSPECTION OF CONTROL MODULE CONNECTOR OUTPUTTING DTCs
  • Inspect the terminal condition of the control module connector outputting DTCs and the mid-connector
  • Are the connector terminals normal without damage, deformation, corrosion, or disconnection?
 Yes Go to the next step
No Repair or replace the connector, then go to Step 9.
3 INSPECTION OF POWER SUPPLY OF CONTROL MODULE OUTPUTTING DTCs
  • Refer to the terminal voltage table of the control module outputting DTCs or use the PID/data monitoring function to inspect the terminal voltage and fuse condition
  • Is the power supply voltage normal?
 Yes Go to the next step
No Repair or replace the connector, then go to Step 9
4 INSPECTION OF BODY GROUND CONDITION OF CONTROL MODULE OUTPUTTING DTCs
  • Inspect the body ground wires and ground point of the control module outputting DTCs.
  • Are the ground and ground point normal?
 Yes Go to the next step
No Repair or replace the connector, then go to Step 9.
5 CAN SYSTEM RELATED WIRING HARNESS INSPECTION
  • CAN system related wiring harness inspection.
    • Short to ground
    • Short to power supply
    • Short between twisted pair wiring harness
    • Open circuit
  • Is the wiring harness normal?
 Yes Go to the next step
No Repair or replace the connector, then go to Step 9
6 INSPECT PCM
  • Disconnect the PCM connector
  • Measure the resistance between the following PCM connector terminals
    • Between terminal 1AM and terminal 1AI (part side) (L5)
    • Between terminal 1AH and terminal 1AL (part side) (MZI-3 7)
  • Is the resistance 118-130 ohm?
 Yes Go to the next step
No Replace the PCM, then go to Step 9 (See PCM REMOVAL/INSTALLATION [MZI-3.7] .) (See PCM REMOVAL/INSTALLATION [L5] .)
7 INSPECT INSTRUMENT CLUSTER
  • Disconnect the instrument cluster connector.
  • Measure the resistance between the following instrument cluster connector terminals
    • Between terminal 2X and terminal 2W (part side)
  • Is the resistance 118-130 ohm?
 Yes Go to the next step
No Replace the instrument cluster, then go to Step 9. (See INSTRUMENT CLUSTER REMOVAL/INSTALLATION )
8 CAN RELATED MODULE VERIFICATION
  • Remove only one of the CAN-related modules.
  • Clear DTCs using the M-MDS
  • Inspect the DTCs of all modules using the M-MDS
  • Are DTCs U0001 88, U0073.00 displayed?
 Yes Reinstall the removed module, remove another module and perform the same inspection. Inspect all of the CAN-related modules using the same procedure. After inspecting all of the modules, go to the next step.
No Replace the removed module
9 AFTER REPAIR VERIFICATION
  • Connect all of the modules.
  • Clear DTCs using the M-MDS.
  • Inspect the DTCs using the M-MDS
  • Are DTCs displayed?
 Yes Perform the CAN system on-board diagnosis again according to the troubleshooting procedure (See FOREWORD [MULTIPLEX COMMUNICATION SYSTEM] .)
No DTC troubleshooting completed.
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