Most of the time, we found that either the small vacuum line to the evap can
or the actual line to the pump was loose/leaking...don't rule out the gas
cap though.
- Bernd
-----Original Message-----
From: owner-dakota-truck@bent.twistedbits.net
[mailto:owner-dakota-truck@bent.twistedbits.net] On Behalf Of Jon Smith
Sent: Wednesday, November 26, 2003 5:43 PM
To: dakota-truck-moderator@bent.twistedbits.net
Subject: DML: Re: Code P1494
The TSB info you posted is nothing more than a bulletin to "advise"
technicians to look somewhere other than the LDP (leak detection pump) as
the faulty part which caused the code to be set. However it does not rule
out a faulty pump.
Check to make sure there is power going to the LDP, without a scan tool to
acutate the pump, check for voltage while it's commanded on during the
self-test (run the test when the motor is bone cold). Also check for
leaking or plugged vac. lines going to the LDP. Usually a collapsed vac.
elbow or oil-clogged line will prevent enough volume of vac. to allow the
pump to actuate properly. T into the LDP vac. hose at the pump with your
vac. gauge, it should have engine vacuum at all times, watch the gauge as
the pump cycles. If it drops below 13" when the pump actuates, the lines
are a culprit.
Hope you've got a FSM =)
-Jon Smith
Does anyone have any more info on this?
Thanks,
Rob S.
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