P1442

DTC P1442 Purge Solenoid Switch Static Test Malfunction:

Evaporative Emissions Control (EVAP) System:

CIRCUIT DESCRIPTION
This diagnostic is performed as part of the purge solenoid diagnostic inhibit criteria and will detect a diagnostic vacuum switch stuck in the open (high vacuum) position. DTC P1442 is a type "B" DTC.

DTC P1442 WILL SET WHEN
Key "ON," engine "OFF" vacuum switch state is high (open).

ACTION TAKEN (VCM-A WILL DEFAULT TO)
The Vehicle Control Module-A (VCM-A) will turn "ON" the Malfunction Indicator Lamp (MIL) after a DTC P1442 has been set and 2 consecutive test failures occur.

DTC P1442 WILL CLEAR WHEN
The VCM-A will turn the MIL "OFF" after three consecutive trips without a fault condition present. A history DTC will be cleared if no fault conditions have been detected for forty warm-up cycles [coolant temperature has risen 22°C (40°F) from start-up coolant temperature and engine coolant temperature exceeds 71°C (160°F) that same ignition cycle] or the Tech 1 clearing feature has been used.

DTC CHART TEST DESCRIPTION
Number(s) below refer to circled number(s) on the diagnostic chart.
1. This test verifies normal Tech 1 readings and normal operation.
2. This test checks the switch, CKT 928 and the VCM-A.
3. This test also checks Diagnostic switch but check the ground CKT and VCM-A.

DIAGNOSTIC AIDS
An intermittent may be caused by a poor connection, rubbed through wire insulation or a wire broken inside the insulation.

Check for:
^ Poor connection or damaged harness - Inspect VCM-A harness connectors for backed out terminals "BL12" and "GR15" improper mating, broken locks, improperly formed or damaged terminals, poor terminal to wire connection and damaged harness.
^ Intermittent test - If connections and harness check OK, monitor a digital voltmeter connected between VCM-A terminal "GR15" and "BL12" while moving related connectors and wiring harness. If the failure is induced, the voltage reading will change. This may help to isolate the location of the malfunction.