DTC U0001:88, U0073:00 [MULTIPLEX COMMUNICATION SYSTEM (R.H.D. (EXCEPT MZR-CD 2.2, MZR 2.0 DISI))]

id0902l8846600

DTC	U0001:88	CAN system communication error
	U0073:00
DETECTION CONDITION		Warning •  Perform the following on-board diagnosis according to FOREWORD [MULTIPLEX COMMUNICATION SYSTEM (R.H.D. (EXCEPT MZR-CD 2.2, MZR 2.0 DISI))] troubleshooting procedure. •  CAN system-related harness malfunction •  CAN system-related module malfunction
POSSIBLE CAUSE		•  Open or short circuit in wiring harness •  Malfunction of connectors between PCM, EPS control module, TCM, DSC HU/CM (with DSC), ABS HU/CM (with ABS), keyless control module, rear vehicle monitoring control module (RH), BCM, AFS control module, SAS control module and instrument cluster •  PCM malfunction •  EPS control module malfunction •  TCM malfunction •  DSC HU/CM malfunction (with DSC) •  ABS HU/CM malfunction (with ABS) •  Keyless control module malfunction •  Rear vehicle monitoring control module (RH) malfunction •  BCM malfunction •  AFS control module malfunction •  SAS control module malfunction •  Instrument cluster malfunction

Diagnostic procedure

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 (R.H.D. (EXCEPT MZR-CD 2.2, MZR 2.0 DISI))].
		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) •  Is the resistance 118-130 ohms?	Yes	Go to the next step.
		No	Replace the PCM, then go to Step 9. (See PCM REMOVAL/INSTALLATION [MZR 1.8, MZR 2.0, MZR 2.5].)
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 ohms?	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 (R.H.D. (EXCEPT MZR-CD 2.2, MZR 2.0 DISI))].)
		No	DTC troubleshooting completed.