| From | Message |
Sigma
Dodge Dakota
JOIN HERE
5/03/2002
19:40:08
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 Subject: PCM code 38??
IP: Logged
Message:
Having trouble locating a description of this code stored in the PCM. Engine is fine in closed loop but will not idle on a restart in open loop. Have to start engine with rpm's @ 1200 or so & hold it there for some time before it will hold idle when hot. Codes 38 & 55 are stored in PCM....
"93" 3.9 Auto with 136k miles..
Thanks...Sigma
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Graphite
*GenIII*
5/04/2002
06:42:17
|  RE: PCM code 38??
IP: Logged
Message:
www.obdii.com has both codes listed
Nothing runs Like a Deere (R)
2002 club cab 4.7 v8 4x4 Graphite /silver
2002 quad cab 4x2 v6 Atlantic blue/silver
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bernd
*GenIII*
5/04/2002
09:37:50
| RE: PCM code 38??
IP: Logged
Message:
38 Wheel Speed Mismatch
NAME OF CODE:
38 Wheel Speed Mismatch
SET CONDITION:
The following criteria must be met for this trouble code to be detected:
Rotational wheel speed differing from the nominal for the vehicle for ANY of the following cases:
One mismatched speed more than double or less than half the other two.
All three speeds differing from each other by more than 8 percent (3 significantly different tire sizes).
Nominal speed greater than 12 MPH.
ABS inactive.
No extended rear sensor input acceleration exceeding 1.0g since the last time all speeds were approximately equal.
Criteria 1-4 satisfied for 24 consecutive controller checks spaced 0.5 second apart.
POSSIBLE CAUSES:
One or more significantly different size tires installed on the vehicle
Damaged or wrong number of teeth on tone wheel
Disturbances that might momentarily mimic mismatched tire size include:
Driven wheel(s) spinning faster than vehicle speed
Differences in wheel speeds while turning
Rapid increase in apparent sensor frequency due to sensor/tone wheel vibration or EMI
1997 Dodge Dakota SLT - V6
Supercharged/Intercooled @ 10# w/Nitrous
14.55 @ 96.01mph
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Sigma
Dodge Dakota
JOIN HERE
5/06/2002
21:55:22
| RE: PCM code 38??
IP: Logged
Message:
Thanks Graphite & Bernd
Have to find cause of that code 38 after I solve the idle problem....
Reset the computer & it idles fine @ hot restart till it relearns....After reviewing the 7 different modes the system works from, I suspect the O2 sensor is sending a faulty signal...It may be leaning the fuel mixture @ idle...
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