DTC P2305:00

Ion sensor No.2 circuit problem

DETECTION CONDITION

• After the engine is started, when the engine speed is 2,000 rpm or less, the signal input to the PCM from ion sensor No.2 is in error.

Diagnostic support note

• This is a continuous monitor (other).

• The check engine light does not illuminate.

• FREEZE FRAME DATA is not available.

• Snapshot data is available.

• DTC is stored in the PCM memory.

FAIL-SAFE FUNCTION

Not applicable

POSSIBLE CAUSE

• Cylinder No.2 misfire

• Ignition coil/ion sensor No.2 connector or terminals malfunction

• Short to ground or open circuit in ion sensor No.2 power supply circuit

• Short to ground in wiring harness between ENGINE2 15 A fuse and ignition coil/ion sensor No.2 terminal A

• ENGINE2 15 A fuse malfunction

• Open circuit in wiring harness between main relay terminal C and ignition coil/ion sensor No.2 terminal A

• Open circuit in wiring harness between ignition coil/ion sensor No.2 terminal D and body ground

• Short to ground in wiring harness between ignition coil/ion sensor No.2 terminal C and PCM terminal 1BF

• PCM connector or terminals malfunction

• Short to power supply in wiring harness between ignition coil/ion sensor No.2 terminal C and PCM terminal 1BF

• Open circuit in wiring harness between ignition coil/ion sensor No.2 terminal C and PCM terminal 1BF

• Ion sensor No.2 malfunction

• PCM malfunction

STEP

INSPECTION

ACTION

1

NOTE:

• Recording can be facilitated using the screen capture function of the PC.

• Record the snapshot data on the repair order.

—

Go to the next step.

2

• 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.

3

• Switch the ignition off, then ON (engine off).

• Perform the Pending Trouble Code Access Procedure and DTC Reading Procedure.

  (See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-G 2.0)].)

• Is the PENDING CODE/DTC P0302:00 also present?

Yes

Go to the applicable PENDING CODE or DTC inspection.

(See DTC P0301:00, P0302:00, P0303:00, P0304:00 [PCM (SKYACTIV-G 2.0)].)

No

Go to the next step.

4

• Switch the ignition off.

• Disconnect the ignition coil/ion sensor No.2 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 12.

No

Go to the next step.

5

• Verify that the ignition coil/ion sensor No.2 connector is disconnected.

• Switch the ignition ON (engine off).

  NOTE:

  • Another DTC may be stored by the PCM detecting an open circuit.

• Measure the voltage at the ignition coil/ion sensor No.2 terminal A (wiring harness-side).

• Is the voltage B+?

Yes

Go to the next step.

No

Inspect the ENGINE2 15 A fuse.

• If the fuse is blown:

• Refer to the wiring diagram and verify whether or not there is a common connector between ENGINE2 15 A fuse and ignition coil/ion sensor No.2 terminal A.

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.

• Replace the fuse.

• If the fuse is damaged:

• Replace the fuse.

• If the fuse is normal:

• Refer to the wiring diagram and verify whether or not there is a common connector between main relay terminal C and ignition coil/ion sensor No.2 terminal A.

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 12.

6

• Verify that the ignition coil/ion sensor No.2 connector is disconnected.

• Switch the ignition off.

• Inspect for continuity between ignition coil/ion sensor No.2 terminal D (wiring harness-side) and body ground.

• 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 ignition coil/ion sensor No.2 terminal D and body ground.

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:

• Inspect for the following:

• Open circuit between ignition coil/ion sensor No.2 and body ground

• Loose or lifting ground point

• Repair or replace the malfunctioning part.

Go to Step 12.

7

• Verify that the ignition coil/ion sensor No.2 connector is disconnected.

• Inspect for continuity between ignition coil/ion sensor No.2 terminal C (wiring harness-side) and body ground.

• Is there continuity?

Yes

Disconnect the PCM connector and inspect the wiring harness for short to ground.

• If the short to ground circuit could be detected in the wiring harness:

• Refer to the wiring diagram and verify whether or not there is a common connector between ignition coil/ion sensor No.2 terminal C and PCM terminal 1BF.

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.

• If the short to ground circuit could not be detected in the wiring harness:

• Replace the PCM (short to ground in the PCM internal circuit).

  (See PCM REMOVAL/INSTALLATION [SKYACTIV-G 2.0].)

Go to Step 12.

No

Go to the next step.

8

• Disconnect the PCM 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 12.

No

Go to the next step.

9

• Verify that the ignition coil/ion sensor No.2 and PCM connectors are disconnected.

• Switch the ignition ON (engine off).

  NOTE:

  • Another DTC may be stored by the PCM detecting an open circuit.

• Measure the voltage at the ignition coil/ion sensor No.2 terminal C (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 ignition coil/ion sensor No.2 terminal C and PCM terminal 1BF.

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 12.

10

• Verify that the ignition coil/ion sensor No.2 and PCM connectors are disconnected.

• Switch the ignition off.

• Inspect for continuity between ignition coil/ion sensor No.2 terminal C (wiring harness-side) and PCM terminal 1BF (wiring harness-side).

• 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 ignition coil/ion sensor No.2 terminal C and PCM terminal 1BF.

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 12.

11

• Inspect the ion sensor No.2.

  (See ION SENSOR INSPECTION [SKYACTIV-G 2.0].)

• Is there any malfunction?

Yes

Replace the ignition coil/ion sensor No.2, then go to the next step.

(See IGNITION COIL/ION SENSOR REMOVAL/INSTALLATION [SKYACTIV-G 2.0].)

No

Go to the next step.

12

• Always reconnect all disconnected connectors.

• Clear the DTC from the PCM memory using the M-MDS.

  (See AFTER REPAIR PROCEDURE [PCM (SKYACTIV-G 2.0)].)

• Perform the KOER self test.

  (See KOEO/KOER SELF TEST [PCM (SKYACTIV-G 2.0)].)

• Is the same DTC present?

Yes

Repeat the inspection from Step 1.

• If the malfunction recurs, replace the PCM.

  (See PCM REMOVAL/INSTALLATION [SKYACTIV-G 2.0].)

Go to the next step.

No

Go to the next step.

13

• Perform the “AFTER REPAIR PROCEDURE”.

  (See AFTER REPAIR PROCEDURE [PCM (SKYACTIV-G 2.0)].)

• Are any DTCs present?

Yes

Go to the applicable DTC inspection.

(See DTC TABLE [PCM (SKYACTIV-G 2.0)].)

No

DTC troubleshooting completed.