DTC U0001:88, U0073, U1900 [MULTIPLEX COMMUNICATION SYSTEM (R.H.D.)]

id0902j4033900

DTC | U0001:88 | Module communication error
--- | --- | ---
U0073 | CAN system communication error
U1900 | CAN system communication error
DETECTION CONDITION | Warning • Perform the following on-board diagnosis according to FOREWORD [MULTIPLEX COMMUNICATION SYSTEM (R.H.D.)] 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, ABS HU/CM, DSC HU/CM, power retractable hardtop control module, active bonnet control module, TCM, keyless control module, steering angle sensor and instrument cluster • PCM malfunction • ABS HU/CM malfunction • DSC HU/CM malfunction • Power retractable hardtop control module malfunction • Active bonnet control module • TCM malfunction • Keyless control module malfunction • Steering angle sensor 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 ― U1900 | Yes | Determine the open circuit location referring to DETERMINING MALFUNCTIONING PART (HS-CAN) [MULTIPLEX COMMUNICATION SYSTEM (R.H.D.)].
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 [L8, LF].)
7 | INSPECT INSTRUMENT CLUSTER • Disconnect the instrument cluster connector. • Measure the resistance between the following instrument cluster connector terminals: ― Between terminal 1J and terminal 1L (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, U1900 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.)].)
No | DTC troubleshooting completed.