DESCRIPTION

Voltage problem between PCM terminal 1AB and PCM terminal 1AG

DETECTION CONDITION

Determination conditions

• A condition in which the voltage between PCM terminals 1AB and 1AG exceeds the specified range continues for the specified period or more.

Preconditions

• Switch the ignition ON (engine off or on)

• Battery voltage: 11—18 V^*1

• The following DTC is not detected:

• Internal PCM malfunction: P064D:00

• ^*1: Value can be verified by displaying PIDs using M-MDS

Drive cycle

• 2

Self test type

• CMDTC self test, KOER self test

Sensor used

• A/F sensor

FAIL-SAFE FUNCTION

• Fixes duty value of A/F sensor heater

• Stops fuel feedback control of A/F sensor

VEHICLE STATUS WHEN DTCs ARE OUTPUT

• Illuminates check engine light.

POSSIBLE CAUSE

• A/F sensor connector or terminals malfunction

• PCM connector or terminals malfunction

• Deterioration in wiring harness between the following terminals:

• A/F sensor terminal F—PCM terminal 1W

• A/F sensor terminal D—PCM terminal 1AB

• A/F sensor terminal B—PCM terminal 1AG

• A/F sensor malfunction

• PCM malfunction

Item

Definition

Unit

Condition/Specification

O2S11

A/F sensor current

µA

• Idle (after warm up): −59 µA (ECT is 92 °C {198 °F})

• Deceleration fuel cut (accelerator pedal released from engine speed of 4,000 rpm or more): Approx. 3.48 mA (ECT is 92 °C {198 °F})

STEP

INSPECTION

RESULTS

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

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 troubleshooting procedure to perform the procedure from Step 1.

STEP

INSPECTION

RESULTS

ACTION

1

• Switch the ignition off.

• Disconnect the A/F sensor connector.

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

• Is there any malfunction?

Yes

Replace the A/F sensor, then go to Step 5.

(See AIR FUEL RATIO (A/F) SENSOR REMOVAL/INSTALLATION [SKYACTIV-G 2.0].)

No

Go to the next step.

2

• Disconnect the PCM connector.

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

• Is there any malfunction?

Yes

Replace the PCM, then go to Step 5.

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

No

Go to the next step.

3

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

• A/F sensor terminal F—PCM terminal 1W

• A/F sensor terminal D—PCM terminal 1AB

• A/F sensor terminal B—PCM terminal 1AG

• Is there any malfunction?

Yes

Repair or replace the wiring harness which has deteriorated, then go to Step 5.

No

Go to the next step.

4

• Start the engine and warm it up completely.

• Access the O2S11 PID using the M-MDS.

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

• Drive the vehicle under the following conditions.

  WARNING:

  • When the M-MDS is used to observe monitor system status while driving, be sure to have another technician with you, or record the data in the M-MDS using the PID/DATA MONITOR AND RECORD capturing function and inspect later.

  • While performing this step, always operate the vehicle in a safe and lawful manner.

• After increasing the engine speed to 3,000 rpm, decelerate using engine braking.

• Is the displayed PID value as follows?

• O2S11: 0.25 mA or more

Yes

Go to the next step.

No

Replace the A/F sensor, then go to the next step.

(See AIR FUEL RATIO (A/F) SENSOR REMOVAL/INSTALLATION [SKYACTIV-G 2.0].)

5

• Always reconnect all disconnected connectors.

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

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

• Perform the KOER self test.

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

• Is the PENDING CODE for this 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.

6

• Is any other DTC or pending code stored?

Yes

Go to the applicable DTC inspection.

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

No

DTC troubleshooting completed.