DTC P0C39:00

Capacitor (i-ELOOP) temperature sensor system: function/circuit malfunction

DETECTION CONDITION

• Any one of the following conditions is met:

• A condition in which the capacitor (i-ELOOP) temperature sensor voltage is less than 0.05 V (less than −50 °C {-58°F}) continues for 1 s.

• A condition in which the capacitor (i-ELOOP) temperature sensor voltage is 4.95 V or more (90 °C {194°F} or more) continues for 1 s.

FAIL-SAFE FUNCTION

• Not applicable

POSSIBLE CAUSE

• Capacitor (i-ELOOP) connector or terminals malfunction

• DC-DC converter connector or terminals malfunction

• Short to ground in wiring harness between capacitor (i-ELOOP) terminal 1A and DC-DC converter terminal 1E

• Short to power supply in wiring harness between capacitor (i-ELOOP) terminal 1A and DC-DC converter terminal 1E

• Capacitor (i-ELOOP) temperature sensor signal circuit and ground circuit are shorted to each other

• Open circuit in wiring harness between the following terminals:

• Capacitor (i-ELOOP) terminal 1A—DC-DC converter terminal 1E

• Capacitor (i-ELOOP) terminal 1B—DC-DC converter terminal 1D

• Capacitor (i-ELOOP) temperature sensor malfunction

• DC-DC converter malfunction

STEP

INSPECTION

ACTION

1

• Verify related Service Bulletins and/or on-line repair information availability.

• Is any related repair information available?

Yes

Perform repair or diagnosis according to the available repair information.

• If the vehicle is not repaired, go to the next step.

No

Go to the next step.

2

• Switch the ignition off.

• Disconnect the negative battery cable.

  (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.5].)

• Disconnect the service plug.

  (See SERVICE PLUG DISCONNECTION/CONNECTION [i-ELOOP].)

• Disconnect the capacitor (i-ELOOP) connector.

• Inspect for poor connection (such as damaged/pulled-out pins, corrosion).

• Is there any malfunction?

Yes

Repair or replace the connector and/or terminals, then go to Step 9.

No

Go to the next step.

3

• Disconnect the DC-DC converter connector.

• Inspect for poor connection (such as damaged/pulled-out pins, corrosion).

• Is there any malfunction?

Yes

Repair or replace the connector and/or terminals, then go to Step 9.

No

Go to the next step.

4

• Verify that the capacitor (i-ELOOP) and DC-DC converter connectors are disconnected.

• Inspect for continuity between capacitor (i-ELOOP) terminal 1A (wiring harness-side) and body ground.

• Is there continuity?

Yes

Refer to the wiring diagram and verify whether or not there is a common connector between capacitor (i-ELOOP) terminal 1A and DC-DC converter terminal 1E.

If there is a common connector:

• Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground.

• Repair or replace the malfunctioning part.

If there is no common connector:

• Repair or replace the wiring harness which has a short to ground.

Go to Step 9.

No

Go to the next step.

5

• Verify that the capacitor (i-ELOOP) and DC-DC converter connectors are disconnected.

• Reconnect the negative battery cable.

  (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.5].)

• Switch the ignition ON (engine off).

• Measure the voltage at the capacitor (i-ELOOP) terminal 1A (wiring harness-side).

• Is the voltage 0 V?

Yes

Go to the next step.

No

Refer to the wiring diagram and verify whether or not there is a common connector between capacitor (i-ELOOP) terminal 1A and DC-DC converter terminal 1E.

If there is a common connector:

• Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to power supply.

• Repair or replace the malfunctioning part.

If there is no common connector:

• Repair or replace the wiring harness which has a short to power supply.

Go to Step 9.

6

• Verify that the capacitor (i-ELOOP) and DC-DC converter connectors are disconnected.

• Switch the ignition off.

• Disconnect the negative battery cable.

  (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.5].)

• Inspect for continuity between capacitor (i-ELOOP) terminals 1A and 1B (wiring harness-side).

• Is there continuity?

Yes

Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:

• Capacitor (i-ELOOP) terminal 1A—DC-DC converter terminal 1E

• Capacitor (i-ELOOP) terminal 1B—DC-DC converter terminal 1D

If there is a common connector:

• Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to each other.

• Repair or replace the malfunctioning part.

If there is no common connector:

• Repair or replace the wiring harness which has a short to each other.

Go to Step 9.

No

Go to the next step.

7

• Verify that the capacitor (i-ELOOP) and DC-DC converter connectors are disconnected.

• Inspect for continuity between the following terminals (wiring harness-side):

• Capacitor (i-ELOOP) terminal 1A—DC-DC converter terminal 1E

• Capacitor (i-ELOOP) terminal 1B—DC-DC converter terminal 1D

• Is there continuity?

Yes

Go to the next step.

No

Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:

• Capacitor (i-ELOOP) terminal 1A—DC-DC converter terminal 1E

• Capacitor (i-ELOOP) terminal 1B—DC-DC converter terminal 1D

If there is a common connector:

• Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit.

• Repair or replace the malfunctioning part.

If there is no common connector:

• Repair or replace the wiring harness which has an open circuit.

Go to Step 9.

8

• Inspect the capacitor (i-ELOOP) temperature sensor.

  (See CAPACITOR (i-ELOOP) INSPECTION [i-ELOOP].)

• Is there any malfunction?

Yes

Replace the capacitor (i-ELOOP), then go to the next step.

(See CAPACITOR (i-ELOOP) REMOVAL/INSTALLATION [i-ELOOP].)

No

Go to the next step.

9

• Always reconnect all disconnected connectors.

• Reconnect the negative battery cable.

  (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.5].)

• Reconnect the service plug.

  (See SERVICE PLUG DISCONNECTION/CONNECTION [i-ELOOP].)

• Clear the DTC for the DC-DC converter using the M-MDS.

  (See CLEARING DTC [i-ELOOP].)

• Switch the ignition off.

• Switch the ignition ON (engine off) and wait for 1 s or more.

• Retrieve the DC-DC converter DTCs using the M-MDS.

  (See DTC INSPECTION [i-ELOOP].)

• Is the same DTC present?

Yes

Repeat the inspection from Step 1.

• If the malfunction recurs, replace the DC-DC converter.

  (See DC-DC CONVERTER REMOVAL/INSTALLATION [i-ELOOP].)

Go to the next step.

No

Go to the next step.

10

• Are any other DTCs displayed?

Yes

Repair or replace the malfunctioning part according to the applicable DTC troubleshooting.

(See DTC TABLE [i-ELOOP].)

No

DTC troubleshooting completed.