DTC No. U1E31-08 LIN Communication malfunction with EOP

MONITOR EXECUTION

Continuous

MONITOR EXECUTION CONDITIONS (Other monitor and Sensor)

Other Monitor (There is no temporary DTC set in memory for the item monitored below)

Not applicable

Sensor (The sensor below is determined to be normal)

Not applicable

DTC SET CONDITIONS

Logic Flow Chart

Check Condition

Power drive unit power supply voltage is 8.0 volts or more.
The communication mode duration is 0.5 second or more.
The vehicle status is in High voltage start, Propulsion system active, or Charge system active.

Judgment Criterion

The communication status 1 between the power drive unit and electric oil pump is in Fail condition for 6.4 seconds or more.
The communication status 2 between the power drive unit and electric oil pump is in Fail condition for 6.4 seconds or more.

OBD-II DRIVE CYCLE PATTERN

Refer to OBD-II Drive Cycle OBD-II DRIVE CYCLE.

TROUBLESHOOTING HINTS

Malfunction of the LIN bus line
Malfunction of the electric oil pump power supply circuit
Malfunction of the electric oil pump
Malfunction of the PHEV-ECU
Malfunction of the power drive unit

DIAGNOSIS

Required Special Tools:

MB992744: Vehicle communication interface-Lite (V.C.I.-Lite)
MB992745: V.C.I.-Lite main harness A
MB992747: V.C.I.-Lite USB cable short
MB992748: V.C.I.-Lite USB cable long
MB991223: Wiring harness set
MB992006: Extra fine probe

1.M.U.T.-IIISE other DTC check

Check whether the DTC, which has the higher priority than this DTC, is set. (Refer to DTC Inspection Priority Chart

Is the DTC set?

Troubleshoot the set DTC (Refer to DIAGNOSTIC TROUBLE CODE CHART

). Then,

2.M.U.T.-IIISE other system DTC

Check whether the PHEV-ECU sets the following DTC.

DTC No. P3123-15 Water Pump monitor circuit-High

Is the DTC set?

Troubleshoot the DTC No. P3123-15 (Refer to DTC No. P3123-15 Water Pump monitor circuit-High

). Then,

3.Check of continuity at electric oil pump connector (ground terminal)

(1) Disconnect the electric oil pump connector, and measure at the wiring harness side.

caution

Check that there is no foreign material inside the connector, and check the inappropriate connection of the connector and break of the pin.

(2) Check the continuity between the electric oil pump connector (ground terminal) and body ground.

OK: Continuity exists (2 Ω or less)

Is the check result normal?

Repair the connector(s) or wiring harness in ground line between the electric oil pump connector and body ground. Then,

4.Voltage measurement at electric oil pump connector (power supply terminal)

(1) Disconnect the electric oil pump connector, and measure at the wiring harness side.

caution

Check that there is no foreign material inside the connector, and check the inappropriate connection of the connector and break of the pin.

(2) Change the power supply mode of the electric motor switch to ON (READY indicator: OFF).

(3) Measure the voltage between the electric oil pump connector (power supply terminal) and body ground.

OK: Battery voltage

Is the check result normal?

5.Check of open circuit in power supply line between electric water pump and relay box (water/oil pump relay)

caution

Check that there is no foreign material inside the connector, and check the inappropriate connection of the connector and break of the pin.

Is the check result normal?

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

Repair the connector(s) or wiring harness. Then,

6.Voltage measurement at power drive unit connector (MLIN terminal)

(1) Disconnect the power drive unit connector, and measure 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 power drive unit connector (MLIN terminal) and body ground.

OK: No voltmeter reading

Is the check result normal?

Repair the connector(s) or wiring harness in MLIN line between the power drive unit connector and body ground. Then,

7.Check of continuity at power drive unit connector (MLIN terminal)

(1) Disconnect the power drive unit connector, and measure at the wiring harness side.

(2) Disconnect the PHEV-ECU connector (E348) and electric oil pump connector.

caution

Check that there is no foreign material inside the connector, and check the inappropriate connection of the connector and break of the pin.

(3) Check the following wiring harnesses for continuity.

Continuity between the power drive unit connector (MLIN terminal) and body ground
OK: No continuity
Continuity between the power drive unit connector (MLIN terminal) and electric oil pump (No. 3 terminal)
OK: Continuity exists (2 Ω or less)

Is the check result normal?

Repair the connector(s) or wiring harness in MLIN line between the power drive unit, electric oil pump and PHEV-ECU. Then,

8.Test the OBD-II drive cycle.

(1) Carry out a test drive with the drive cycle pattern. Refer to OBD-II Drive Cycle OBD-II DRIVE CYCLE

(2) Check the DTC.

Is the DTC set?

Replace the electric oil pump (Refer to ELECTRIC OIL PUMP REMOVAL AND INSTALLATION

). Then, go to

9.Test the OBD-II drive cycle.

(1) Carry out a test drive with the drive cycle pattern. Refer to OBD-II Drive Cycle OBD-II DRIVE CYCLE

(2) Check the DTC.

Is the DTC set?

Replace the PHEV–ECU (Refer to PHEV-ECU REMOVAL AND INSTALLATION

). Then, go to

The procedure is complete.

10.Test the OBD-II drive cycle.

(1) Carry out a test drive with the drive cycle pattern. Refer to OBD-II Drive Cycle OBD-II DRIVE CYCLE

(2) Check the DTC.

Is the DTC set?

Replace the power drive unit (Refer to POWER DRIVE UNIT REMOVAL AND INSTALLATION

). Then,

The procedure is complete.

11.Test the OBD-II drive cycle.

(1) Carry out a test drive with the drive cycle pattern. Refer to OBD-II Drive Cycle OBD-II DRIVE CYCLE

(2) Check the DTC.

Is the DTC set?

Retry the troubleshooting.

The procedure is complete.