Check Engine Light Code on 1996 Isuzu Trooper

My check engine light just came on. It is code P1442. Just wondering if someone could shed some light onto this. Also, My car has been running a little hotter than usual. I had to replace my heater core and water pump this past winter. It fixed the problem with running hot, but it recently just started to start happening again.

by in Chesapeake, VA on August 16, 2011
1 answer
ANSWER by on July 30, 2014
P1442 EVAP Vacuum Switch Circuit High Input During Key On Possible Causes Setting Conditions Vacuum switch signal circuit is open between switch and PCM Vacuum switch ground circuit open between switch and ground Vacuum switch has failed DTC P0106, P0107, P0108, P0112, P0113, P0117, P0118, P0121, P0122 or P0123 not set; ECT and IAT sensors more than 41ºF at startup, and the difference between the startup ECT sensor and IAT signal more than 45ºF, system voltage at 11-16v, engine speed from 800-6,000 rpm, throttle angle over 14%, Purge duty cycle below 1%, and the PCM detected the EVAP Purge Switch indicated 12v (the switch is open) for 5 seconds. This code sets in 2 Trip(s). This code will turn on the MIL (Malfunction Indicator Lamp) If you need this diagnosed please call Roy at 757-456-0722 and let him know if you need a FREE loaner car while yours is being serviced.
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