P1452

Read the instructions below then start the fault diagnostic procedure.

Symptom: CHECK ENGINE.

P1452

Fault symptoms

•	CHECK ENGINE.

On-Board Diagnostics

Type of diagnosis:

-	Once per driving cycle. Interrupted when fault criteria fulfilled or OK reported. Restarts next driving cycle.

Enable criteria:

Accepted transition diagnosis of oxygen sensor 1. Purge active. Idling . Max. one change in status of brake light switch. Purge adaptation higher than -8 %. Car stationary for 8 sec. The diagnosis will start once the above conditions have been fulfilled. If the diagnosis is interrupted then the speed must exceed 0 on one occasion before it is allowed to restart.

Fault criteria:

-	Tank pressure below -1.8 kPa for 6.5 sec. Pressure sensor adaptation below -1.2 kPa. (Adaptation cannot be read with diagnostic tool.)

Dependents:

-	P0444, P0445, P0501, P0502, P0506, P0507, P1444, P1445, P1576 and P1577.

System reaction to a fault:

-	Integrity diagnosis of purge system blocked. Purge and fuel adaptation blocked.

OK report:

-	Diagnoses for P1451, P1452 and P1453 performed once and fault criteria not fulfilled. Fault criteria for P0452 or P0453 not fulfilled.

Fault handling: (See section “Fault diagnosis, general” for more information.)

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Type III.

Diagnostic help

Fault diagnosis concerns checking tank pressure equalization to atmosphere or electrical fault in connecting leads or in the sensor.

Functions in the diagnostic tool related to the fault:

•	Diagnostic status for the diagnosis.

•	Pressure sensor value, unit kPa. The value should be about 0 kPa when the filler cap is removed.

See also the description of readings in ”Fault diagnosis, general” for more information.

Checking the wiring

Jiggle the wiring harness at several points and in different directions to detect intermittent breaks and short circuits. Observe the multimeter, diagnostic tool or test lamp during the check.