P0442 - EVAP LEAK MONITOR MEDIUM (0.040) LEAK DETECTED
WHEN MONITORED
Immediately after a cold start, with battery/ambient temperature between
40 °F and 90 °F and coolant temperature within 10 °F of battery/ambient
temperature.
SET CONDITION
If there is a leak larger than 0.040" and smaller than 0.080" in the
evaporative system.
POSSIBLE CAUSES
Confirmed leak in the EVAP system
Intermittent LDP monitor failure
P0455 - EVAP LEAK MONITOR LARGE LEAK DETECTED
TEST NOTE
This symptom is diagnosed using the test P0442 - EVAP LEAK MONITOR
MEDIUM (0.040) LEAK DETECTED.
WHEN MONITORED
Immediately after a cold start, with battery/ambient temperature between
40 °F and 90 °F and coolant temperature within 10 °F of battery/ambient
temperature.
SET CONDITION
There is a leak larger than 0.080" in the evaporative system.
POSSIBLE CAUSES
Confirmed leak in the EVAP system
Intermittent LDP monitor failure
P1687 - NO CLUSTER BUS MESSAGES
POSSIBLE CAUSES
Instrument cluster
Open CCD(+) circuit
Open CCD(-) circuit
Wiring harness intermittent problem
PCM CCD bus circuit open
PCM CCD bus shorted to B+
PCM internal CCD bus open
Did you mess around with the evap can under the truck (or a disconnected
line to/from the evap)? On the 1687: Bad ground, or harness was
disconnected and the key turned on is the most common cause.
- Bernd
-----Original Message-----
From: owner-dakota-truck@buffnet.net
[mailto:owner-dakota-truck@buffnet.net] On Behalf Of RonsY2KDak@aol.com
Sent: Thursday, January 17, 2002 1:08 PM
To: dakota-truck@buffnet.net
Subject: DML: Codes 2000 4.7
Hey Folks,
I was checking to see if anyone could tell me what the following codes
are. I
checked the trouble codes on the Main DML page but it didn't have
these:
P0442
P0455
P1687
Any help would be appreciated
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