DTC P0098:00

IAT sensor No.2 circuit high input

DETECTION CONDITION

• If the PCM detects that the IAT sensor No.2 voltage at the PCM terminal 1CE is 4.96 V or more for 5 s, the PCM determines that the IAT sensor No.2 circuit voltage is high.

Diagnostic support note

• This is a continuous monitor (CCM).

• The check engine light illuminates if the PCM detects the above malfunction condition during the first drive cycle.

• FREEZE FRAME DATA/Snapshot data is available.

• DTC is stored in the PCM memory.

FAIL-SAFE FUNCTION

Not applicable

POSSIBLE CAUSE

• MAP sensor/IAT sensor No.2 connector or terminals malfunction

• PCM connector or terminals malfunction

• IAT sensor No.2 malfunction

• Short to power supply in wiring harness between MAP sensor/IAT sensor No.2 terminal B and PCM terminal 1CE

• Open circuit in wiring harness between the following terminals:

• MAP sensor/IAT sensor No.2 terminal B—PCM terminal 1CE

• MAP sensor/IAT sensor No.2 terminal A—PCM terminal 1BX

• PCM malfunction

Item (definition)

Unit/Condition

Definition

Condition/Specification (Reference)

IAT2

°C, °F

Intake air temperature (No.2) input from IAT sensor No.2

• Displays IAT (No.2)

V

IAT sensor No.2 voltage

• IAT2 is 65 °C {149 °F}: Approx. 1.7 V

• IAT2 is 66 °C {151 °F}: Approx. 1.65 V

STEP

INSPECTION

ACTION

1

NOTE:

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

• Record the FREEZE FRAME DATA/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

• Access the IAT2 PID using the M-MDS.

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

• Verify the IAT2 PID value.

• Is the IAT2 PID value 5 V or B+?

Yes

Go to Step 7.

No

Go to the next step.

4

• Switch the ignition off.

• Disconnect the MAP sensor/IAT 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 10.

No

Go to the next step.

5

• 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 10.

No

Go to the next step.

6

• Inspect the IAT sensor No.2.

  (See INTAKE AIR TEMPERATURE (IAT) SENSOR INSPECTION [SKYACTIV-G 2.0].)

• Is there any malfunction?

Yes

Replace the MAP sensor/IAT sensor No.2, then go to Step 10.

(See MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR/INTAKE AIR TEMPERATURE (IAT) SENSOR NO.2 REMOVAL/INSTALLATION [SKYACTIV-G 2.0].)

No

Go to Step 10.

7

• Switch the ignition off.

• Disconnect the MAP sensor/IAT sensor No.2 connector.

• Access the IAT2 PID using the M-MDS.

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

• Verify the IAT2 PID value.

• Is the IAT2 PID value 5 V or B+?

Yes

Go to the next step.

No

Go to Step 9.

8

• Verify that the MAP sensor/IAT sensor No.2 connector is disconnected.

• Switch the ignition off.

• Disconnect the PCM connector.

• Inspect for continuity between MAP sensor/IAT sensor No.2 terminal B (wiring harness-side) and PCM terminal 1CE (wiring harness-side).

• Is there continuity?

Yes

Refer to the wiring diagram and verify whether or not there is a common connector between MAP sensor/IAT sensor No.2 terminal B and PCM terminal 1CE.

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 10.

No

Refer to the wiring diagram and verify whether or not there is a common connector between MAP sensor/IAT sensor No.2 terminal B and PCM terminal 1CE.

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 10.

9

• Verify that the MAP sensor/IAT sensor No.2 connector is disconnected.

• Switch the ignition off.

• Disconnect the PCM connector.

• Inspect for continuity between MAP sensor/IAT sensor No.2 terminal A (wiring harness-side) and PCM terminal 1BX (wiring harness-side).

• Is there continuity?

Yes

Replace the MAP sensor/IAT sensor No.2, then go to the next step.

(See MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR/INTAKE AIR TEMPERATURE (IAT) SENSOR NO.2 REMOVAL/INSTALLATION [SKYACTIV-G 2.0].)

No

Refer to the wiring diagram and verify whether or not there is a common connector between MAP sensor/IAT sensor No.2 terminal A and PCM terminal 1BX.

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 the next step.

10

• 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 KOEO or 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.

11

• 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.