DTC DETECTION LOGIC
NOTE: If DTC P0451 is displayed with DTC P0643, first perform the trouble diagnosis for DTC P0643. Refer to EC344, "DTC Logic".
DTC No. | Trouble diagnosis name | DTC detecting condition | Possible cause |
P0452 | EVAP SYS PRES SEN (EVAP control system pressure sensor low input) | An excessively low voltage from the sensor is sent to ECM. |
|
DTC CONFIRMATION PROCEDURE
1.PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following procedure before conducting the next test.
TESTING CONDITION: Always perform test at a temperature of 5C (41F) or more.
>> GO TO 2.
2.PERFORM DTC CONFIRMATION PROCEDURE
With CONSULT
With GST
Is 1st trip DTC detected?
YES >> Proceed to EC, "Diagnosis Procedure".
NO >> INSPECTION END
1.CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR CONNECTOR FOR WATER
Water should not exist.
Is the inspection result normal?
YES >> GO TO 2.
NO >> Repair or replace harness connector.
2.CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR POWER SUPPLY
Is the inspection result normal?
YES >> GO TO 6.
NO >> GO TO 3.
3.CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR POWER SUPPLY CIRCUIT
Is the inspection result normal?
YES >> GO TO 4.
NO >> Repair or replace errordetected parts
4.CHECK SENSOR POWER SUPPLY CIRCUIT
Check harness for short to power and short to ground, between the following
terminals.
*: With A/C models
Is the inspection result normal?
YES >> GO TO 5.
NO >> Repair short to ground or short to power in harness or connectors.
5.CHECK COMPONENTS
Check the following.
Is the inspection result normal?
YES >> Check intermittent incident. Refer to GI, "Intermittent Incident".
NO >> Replace malfunctioning component.
6.CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR GROUND CIRCUIT
Is the inspection result normal?
YES >> GO TO 7.
NO >> Repair or replace errordetected parts.
7.CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR SIGNAL CIRCUIT
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 to power.
Is the inspection result normal?
YES >> GO TO 8.
NO >> Repair or replace errordetected parts.
8.CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR
Check the EVAP control system pressure sensor. Refer to EC, "Component Inspection".
Is the inspection result normal?
YES >> Check intermittent incident. Refer to GI, "Intermittent Incident".
NO >> Replace EVAP control system pressure sensor. Refer to FL, "Removal and Installation".
1.CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR
Always replace Oring with a new one.
CAUTION:
Is the inspection result normal?
YES >> INSPECTION END
NO >> Replace EVAP control system pressure sensor. Refer to FL, "Removal and Installation".
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Input signal to ECM
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