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DTC No. U2276-87 Lost Communication With CDM
 
 
caution
  • When measuring the resistance in the CAN bus line, disconnect the 12V battery negative terminal.
  • When measuring the resistance or voltage in the CAN bus line, use a specified digital multimeter.
 
 
 
 
DTC SET CONDITION
Check Condition
  • The power supply mode of the electric motor switch is ON.
Judgment Criterion
  • The CAN signal from the chassis control module can not be received for 2 seconds or more.
 
 
TROUBLESHOOTING HINTS
  • Malfunction of the CAN bus line (drivetrain CAN1)
  • Malfunction of the chassis control module power supply circuit
  • Malfunction of the chassis control module
  • Malfunction of the 8CH CAN gateway
  • Malfunction of the PHEV-ECU
 
 
DIAGNOSIS
1.M.U.T.-IIISE other DTC
Check whether the PHEV-ECU sets the following DTC.
  • DTC No. U2176-87 Lost Communication With CDM
Is the DTC set?
Troubleshoot the set DTC (Refer to DTC No. U2176-87 Lost Communication With CDM).
 
2.PHEV-ECU terminating resistance measurement
(1) Disconnect the PHEV-ECU connector (M310), and measure at the PHEV-ECU side.
(2) Measure the resistance between the CNPH terminal and CNPL terminal.
OK: 120 ± 20 Ω
Is the check result normal?
Replace the PHEV-ECU (Refer to PHEV-ECU REMOVAL AND INSTALLATION).
 
3.Chassis control module terminating resistance measurement
(1) Disconnect the chassis control module connector, and measure at the chassis control module side.
(2) Measure the resistance between the CN3H terminal and CN3L terminal.
OK: 120 ± 20 Ω
Is the check result normal?
Replace the chassis control module (Refer to Driver Assistance System - Chassis Control Module Removal and Installation).
 
4.Check of short circuit in drivetrain CAN1 bus line
caution
  • When measuring the resistance in the CAN bus line, disconnect the 12V battery negative terminal.
  • When measuring the resistance or voltage in the CAN bus line, use a specified digital multimeter.
(1) Disconnect both the PHEV-ECU connector and chassis control module connector, and measure the resistance at the wiring harness side.
(2) Measure the resistance between the following terminals.
  • Resistance between the CNPH terminal and CNPL terminal
  • Resistance between the CNPH terminal and body ground
  • Resistance between the CNPL terminal and body ground
OK: 1 kΩ or more
Is the check result normal?
Repair the connector(s) or wiring harness.
 
5.Check of short to power supply circuit in drivetrain CAN1 bus line
caution
  • When measuring the resistance in the CAN bus line, disconnect the 12V battery negative terminal.
  • When measuring the resistance or voltage in the CAN bus line, use a specified digital multimeter.
(1) Disconnect both the PHEV-ECU connector and chassis control module connector, and measure the resistance at the wiring harness side.
(2) Change the power supply mode of the electric motor switch to ON (READY indicator: OFF).
(3) Measure the voltage between the following terminals.
  • Voltage between the CNPH terminal and body ground
  • Voltage between the CNPL terminal and body ground
OK: 4.0 V or more
Is the check result normal?
Repair the connector(s) or wiring harness.
 
6.Check of open circuit in CNPH and CNPL lines between PHEV-ECU and chassis control module
Is the check result normal?
Repair the connector(s) or wiring harness.
 
7.Check whether the DTC is set again.
Is the DTC set?
Replace the chassis control module (Refer to Driver Assistance System - Chassis Control Module Removal and Installation), Then go to .
The trouble can be an intermittent malfunction (Refer to General Information - How to Use Troubleshooting/Inspection Service Points, How to Cope with Intermittent Malfunctions HOW TO COPE WITH INTERMITTENT MALFUNCTIONS).
 
8.Check whether the DTC is set again.
Is the DTC set?
Replace the PHEV-ECU (Refer to PHEV-ECU REMOVAL AND INSTALLATION).
The procedure is complete.