DTC P0452 EVAPORATIVE EMISSION CONTROL SYSTEM PRESSURE SENSOR LOW INPUT

/ 9-2X (9346) / 2005 / 2. Engine / ENGINE (DIAGNOSTICS), 2.5i / Diagnostic Procedure with Diagnostic Trouble Code (DTC) / Fault diagnosis, fault codes / DTC P0452 EVAPORATIVE EMISSION CONTROL SYSTEM PRESSURE SENSOR LOW INPUT

DTC DETECTING CONDITION:

•

Two consecutive driving cycles with fault

•

GENERAL DESCRIPTION

Important
After repair or replacement of faulty parts, conduct Clear Memory Mode and Inspection Mode .

WIRING DIAGRAM:

CHECK CURRENT DATA.

Turn ignition switch to OFF.

Remove the fuel filler cap.

Install the fuel filler cap.

Turn ignition switch to ON.

Read the data of fuel tank pressure sensor signal using Vehicle Diagnostic Interface or the OBD-II general scan tool.

Note
•	Vehicle Diagnostic Interface For detailed operation procedures, refer to “READ CURRENT DATA FOR ENGINE”.
•	OBD-II general scan tool For detailed operation procedures, refer to the OBD-II General Scan Tool Instruction Manual.

Is the measured value less than −2.8 kPa (−21.0 mmHg, −0.827 inHg)?

Yes

The malfunction indicator light may light up, however, the circuit is returned to the normal status at the moment.

CHECK POWER SUPPLY TO FUEL TANK PRESSURE SENSOR.

Measure the voltage between ECM connector and chassis ground.

Connector & terminal

(B136) No. 16 (+) — Chassis ground (−):

Is the voltage more than 4.5 V?

Yes

CHECK POWER SUPPLY TO FUEL TANK PRESSURE SENSOR.

Measure the voltage between ECM connector and chassis ground.

Connector & terminal

(B136) No. 16 (+) — Chassis ground (−):

Does the voltage change by shaking the ECM harness and connector?

Yes

Repair poor contact in ECM connector.

Contact Service Center.

CHECK INPUT SIGNAL FOR ECM.

Measure the voltage between ECM and chassis ground.

Connector & terminal

(B136) No. 21 (+) — Chassis ground (−):

Is the voltage less than 0.2 V?

Yes

CHECK INPUT SIGNAL FOR ECM. (USING Vehicle Diagnostic Interface.)

Read the data of fuel tank pressure sensor signal using Vehicle Diagnostic Interface.

Note
•	Vehicle Diagnostic Interface For detailed operation procedures, refer to “READ CURRENT DATA FOR ENGINE”.

Does the measured value change by shaking the ECM harness and connector?

Yes

Repair poor contact in ECM connector.

CHECK HARNESS BETWEEN ECM AND COUPLING CONNECTOR IN REAR WIRING HARNESS.

Turn ignition switch to OFF.

Remove the rear seat cushion.

Separate rear wiring harness and fuel tank cord.

Turn ignition switch to ON.

Measure the voltage between rear wiring harness connector and chassis ground.

Connector & terminal

(R15) No. 12 (+) — Chassis ground (−):

Is the voltage more than 4.5 V?

Yes

•

Repair harness and connector.

•

Note
In this case, repair the following:
•	Open circuit in harness between ECM and rear wiring harness connector
•	Poor contact in coupling connector

CHECK HARNESS BETWEEN ECM AND COUPLING CONNECTOR IN REAR WIRING HARNESS.

Turn ignition switch to OFF.

Disconnect the connector from ECM.

Measure the resistance of harness between ECM and rear wiring harness connector.

Connector & terminal

(B136) No. 35 — (R15) No. 14:

Is the resistance less than 1 Ω?

Yes

•

Repair harness and connector.

•

Note
In this case, repair the following:
•	Open circuit in harness between ECM and rear wiring harness connector
•	Poor contact in coupling connector
•	Poor contact in joint connector

CHECK HARNESS BETWEEN ECM AND COUPLING CONNECTOR IN REAR WIRING HARNESS.

Measure the resistance of harness between rear wiring harness connector and chassis ground.

Connector & terminal

(R15) No. 14 — Chassis ground:

Is the resistance more than 1 MΩ?

Yes

Repair short circuit to ground in harness between ECM and rear wiring harness connector.

CHECK FUEL TANK CORD.

Disconnect the connector from fuel tank pressure sensor.

Measure the resistance of fuel tank cord.

Connector & terminal

(R57) No. 12 — (R47) No. 3:

Is the resistance less than 1 Ω?

Yes

Repair open circuit in fuel tank cord.

CHECK FUEL TANK CORD.

Measure the resistance of fuel tank cord.

Connector & terminal

(R57) No. 14 — (R47) No. 2:

Is the resistance less than 1 Ω?

Yes

Repair open circuit in fuel tank cord.

CHECK FUEL TANK CORD.

Measure the resistance of harness between fuel tank pressure sensor connector and engine ground.

Connector & terminal

(R47) No. 1 — Chassis ground:

Is the resistance more than 1 MΩ?

Yes

Repair short circuit to ground in fuel tank cord.

CHECK FOR POOR CONTACT.

Check for poor contact in fuel tank pressure sensor connector.

Is there poor contact in fuel tank pressure sensor connector?

Yes

Repair poor contact in fuel tank pressure sensor connector.

Replace the fuel tank pressure sensor.

DTC P0452 EVAPORATIVE EMISSION CONTROL SYSTEM PRESSURE SENSOR LOW INPUT

CHECK CURRENT DATA.

Is the measured value less than −2.8 kPa (−21.0 mmHg, −0.827 inHg)?

CHECK POWER SUPPLY TO FUEL TANK PRESSURE SENSOR.

Is the voltage more than 4.5 V?

CHECK POWER SUPPLY TO FUEL TANK PRESSURE SENSOR.

Does the voltage change by shaking the ECM harness and connector?

CHECK INPUT SIGNAL FOR ECM.

Is the voltage less than 0.2 V?

CHECK INPUT SIGNAL FOR ECM. (USING Vehicle Diagnostic Interface.)

Does the measured value change by shaking the ECM harness and connector?

CHECK HARNESS BETWEEN ECM AND COUPLING CONNECTOR IN REAR WIRING HARNESS.

Is the voltage more than 4.5 V?

CHECK HARNESS BETWEEN ECM AND COUPLING CONNECTOR IN REAR WIRING HARNESS.

Is the resistance less than 1 Ω?

CHECK HARNESS BETWEEN ECM AND COUPLING CONNECTOR IN REAR WIRING HARNESS.

Is the resistance more than 1 MΩ?

CHECK FUEL TANK CORD.

Is the resistance less than 1 Ω?

CHECK FUEL TANK CORD.

Is the resistance less than 1 Ω?

CHECK FUEL TANK CORD.

Is the resistance more than 1 MΩ?

CHECK FOR POOR CONTACT.

Is there poor contact in fuel tank pressure sensor connector?

Our Friends