DESCRIPTION

ECT sensor No.1 circuit range/performance problem

DETECTION CONDITION

Determination conditions

• During the 5 min after the engine is started, the engine coolant temperature does not increase above 6 °C {11 °F}.

Preconditions

• Before starting the engine, leave the vehicle with the engine turned off for 6 hours or more.

• The following DTCs are not detected:

• ECT sensor No.1: P0117:00, P0118:00

Drive cycle

• 1

Self test type

• CMDTC self test

Sensor used

• ECT sensor No.1

FAIL-SAFE FUNCTION

• Not applicable

VEHICLE STATUS WHEN DTCs ARE OUTPUT

• Illuminates check engine light.

POSSIBLE CAUSE

• ECT sensor No.1 connector or terminals malfunction

• PCM connector or terminals malfunction

• ECT sensor No.1 loose

• ECT sensor No.1 malfunction

• Poor assembly of engine coolant hose (engine coolant passage malfunction)

• Poor engine coolant, leakage, or freezing

• Use of unspecified engine coolant

• Thermostat malfunction

• PCM malfunction

Item

Definition

Unit

Condition/Specification

ECT

Engine coolant temperature input from ECT sensor No.1

°C, °F

• Displays ECT

ECT sensor No.1 voltage

V

Ignition switched ON (engine off)

• ECT is 92 °C {198 °F}: Approx. 0.65 V

Idle (after warm up)

• ECT is 93 °C {199 °F}: Approx. 0.64 V

Racing (Engine speed is 2,000 rpm)

• ECT is 92 °C {198 °F}: Approx. 0.66 V

Racing (Engine speed is 4,000 rpm)

• ECT is 93 °C {199 °F}: Approx. 0.64 V

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 and DIAGNOSTIC MONITORING TEST RESULTS (engine cooling system related) on the repair order.

—

Go to the next step.

3

• Start the engine.

• Access the ECT PID using the M-MDS.

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

• Does the PID value fluctuate when the PCM and ECT sensor No.1 connectors are shaken?

Yes

Repair or replace the applicable connector parts.

Go to the troubleshooting procedure to perform the procedure from Step 7.

No

Go to the next step.

4

• Access the ECT PID using the M-MDS.

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

• Is the PID value within specification?

Yes

Go to the troubleshooting procedure to perform the procedure from Step 3.

No

Go to the troubleshooting procedure to perform the procedure from Step 1.

STEP

INSPECTION

RESULTS

ACTION

1

• Inspect installation of ECT sensor No.1.

• Is the ECT sensor No.1 installed securely?

Yes

Go to the next step.

No

Retighten the ECT sensor No.1, then go to Step 7.

(See ENGINE COOLANT TEMPERATURE (ECT) SENSOR REMOVAL/INSTALLATION [SKYACTIV-G 2.0].)

2

• Inspect the ECT sensor No.1.

  (See ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION [SKYACTIV-G 2.0].)

• Is there any malfunction?

Yes

Replace the ECT sensor No.1, then go to Step 7.

(See ENGINE COOLANT TEMPERATURE (ECT) SENSOR REMOVAL/INSTALLATION [SKYACTIV-G 2.0].)

No

Go to the next step.

3

• Verify the connection condition of the engine coolant passage (such as hoses).

  (See COOLING SYSTEM LOCATION INDEX [SKYACTIV-G 2.0].)

• Is there any malfunction?

Yes

Reconnect the engine coolant passage correctly.

Replace the engine coolant, then go to Step 7.

(See ENGINE COOLANT REPLACEMENT [SKYACTIV-G 2.0].)

No

Go to the next step.

4

• Inspect the following:

• Is the system filled with the specified engine coolant?

• Is there the possibility of freezing (low engine coolant concentration)?

• Has foreign matter penetrated the engine coolant?

• Are all items normal?

Yes

Go to the next step.

No

Replace the engine coolant, then go to Step 7. (Advise the customer to use specified engine coolant used.)

(See ENGINE COOLANT REPLACEMENT [SKYACTIV-G 2.0].)

5

• Perform the “ENGINE COOLANT LEAKAGE INSPECTION”.

  (See ENGINE COOLANT LEAKAGE INSPECTION [SKYACTIV-G 2.0].)

• Is there engine coolant leaking from the engine coolant passage?

Yes

Repair or replace the malfunctioning location and refill the system with engine coolant.

(See ENGINE COOLANT REPLACEMENT [SKYACTIV-G 2.0].)

Go to Step 7.

No

Go to the next step.

6

• Inspect the thermostat.

  (See THERMOSTAT INSPECTION [SKYACTIV-G 2.0].)

• Is there any malfunction?

Yes

Replace the thermostat, then go to the next step.

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

No

Go to the next step.

7

• Always reconnect all disconnected connectors.

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

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

• Implement the repeatability verification procedure.

  (See Repeatability Verification Procedure.)

• Perform the DTC Reading Procedure.

  (See ON-BOARD DIAGNOSTIC 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.

8

• 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.