EVAP Control System Pressure Sensor For California
P0452 EVAP CONTROL SYSTEM PRESSURE SENSOR
Description
The EVAP control system pressure sensor detects pressure in the purge line. The sensor output voltage to the ECM increases as pressure increases.
DTC Logic
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1. PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test.
TESTING CONDITION:
Always perform test at a temperature of 5�C (41�F) or more.
- GO TO 2.
2. PERFORM DTC CONFIRMATION PROCEDURE
With CONSULT
1.Start engine and warm it up to normal operating temperature.
2.Turn ignition switch OFF and wait at least 10 seconds.
3.Turn ignition switch ON.
4.Select "DATA MONITOR" mode with CONSULT.
5.Make sure that "FUEL T/TMP SE" is more than 0�C (32�F).
6.Start engine and wait at least 20 seconds.
7.Check 1st trip DTC.
With GST
1.Start engine and warm it up to normal operating temperature.
2.Set voltmeter probes to ECM harness connector and ground as follows.
3.Make sure that the voltage is less than 4.2 V.
4.Turn ignition switch OFF and wait at least 10 seconds.
5.Start engine and wait at least 20 seconds.
6.Check 1st trip DTC.
Is 1st trip DTC detected?
YES- Go to "Diagnosis Procedure".
NO- INSPECTION END
Diagnosis Procedure
1. CHECK GROUND CONNECTION
1.Turn ignition switch OFF.
2.Check ground connection E9. Refer to Ground Inspection in Circuit Inspection.
Is the inspection result normal?
YES- GO TO 2.
NO- Repair or replace ground connection.
2. CHECK CONNECTOR
1.Disconnect EVAP control system pressure sensor harness connector.
2.Check sensor harness connector for water.
Water should not exist.
Is the inspection result normal?
YES- GO TO 3.
NO- Repair or replace harness connector.
3. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR POWER SUPPLY CIRCUIT-I
1.Turn ignition switch ON.
2.Check the voltage between EVAP control system pressure sensor harness connector and ground.
Is the inspection result normal?
YES- GO TO 10.
NO- GO TO 4.
4. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR POWER SUPPLY CIRCUIT-II
1.Turn ignition switch OFF.
2.Disconnect ECM harness connector.
3.Check the continuity between EVAP control system pressure sensor harness connector and ECM harness connector.
Is the inspection result normal?
YES- GO TO 6.
NO- GO TO 5.
5. DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors B10, E29
- Harness for open or short between EVAP control system pressure sensor and ECM
- Repair open circuit or short to ground or short to power in harness or connectors.
6. CHECK SENSOR POWER SUPPLY CIRCUITS
Check harness for short to power and short to ground, between the following terminals.
Is the inspection result normal?
YES- GO TO 7.
NO- Repair short to ground or short to power in harness or connectors.
7. CHECK COMPONENTS
Check the following.
- Crankshaft position sensor (POS) (CKP Sensor (POS) For California.)
- Refrigerant pressure sensor (Refrigerant Pressure Sensor.)
- Tumble control valve position sensor (P2004.)
Is the inspection result normal?
YES- GO TO 8.
NO- Replace malfunctioning component.
8. CHECK APP SENSOR
Refer to "Component Inspection".
Is the inspection result normal?
YES- GO TO 10.
NO- GO TO 9.
9. REPLACE ACCELERATOR PEDAL ASSEMBLY
Replace accelerator pedal assembly. Removal And Installation.
- INSPECTION END
10. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR GROUND CIRCUIT FOR OPEN AND
SHORT
1.Turn ignition switch OFF.
2.Disconnect ECM harness connector.
3.Check the continuity between EVAP control system pressure sensor harness connector and ECM harness connector.
4.Also check harness for short to ground and short to power.
Is the inspection result normal?
YES- GO TO 12.
NO- GO TO 11.
11. DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors B10, E29
- Harness for open or short between EVAP control system pressure sensor and ECM
- Repair open circuit or short to ground or short to power in harness or connectors.
12. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND
SHORT
1.Check the continuity between EVAP control system pressure sensor harness connector and ECM harness connector.
2.Also check harness for short to ground and short to power.
Is the inspection result normal?
YES- GO TO 14.
NO- GO TO 13.
13. DETECT MALFUNCTIONING PART
Check the following.
- Harness connectors B10, E29
- Harness for open or short between EVAP control system pressure sensor and ECM
- Repair open circuit or short to ground or short to power in harness or connectors.
14. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR
Refer to "Component Inspection".
Is the inspection result normal?
YES- GO TO 15.
NO- Replace EVAP control system pressure sensor. Removal And Installation.
15. CHECK INTERMITTENT INCIDENT
Intermittent Incident.
- INSPECTION END
Component Inspection
1. CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR
1.Turn ignition switch OFF.
2.Remove EVAP control system pressure sensor with its harness connector connected from EVAP canister.
Removal And Installation.
Always replace O-ring with a new one.
3.Install a vacuum pump to EVAP control system pressure sensor.
4.Turn ignition switch ON and check output voltage between ECM harness connector and ground under the following conditions.
Is the inspection result normal?
YES- INSPECTION END
NO- Replace EVAP control system pressure sensor. Removal And Installation.