Dodge RAM TRUCK 1500 1995 Service Manual page 1150

14-68 GENERAL DIAGNOSIS—EXCEPT DIESEL —~
_ - — B R
DATA LINK
C O N N E C T O R
f t f t
<kn| yJ M« In » .J f MBI '
J9214-20
D-l GROUND
D-2 N / C
D-3 SC! TRANS
D-4 SCI RECEIVE
D-5
IGNITION *
D-6 NOT USED
POWERTRAIN CONTROL
MODULE (PCM)
J9414-11
Fig, 47 Data Link Connector Location—Typical
After any stored DTC information has been ob­
served, the display will end with a flashing DTC
number 55. This will indicate the end of all stored in­
formation.
Refer to the Diagnostic Trouble Code (DTC) charts
for DTC identification.
If the problem is repaired or ceases to exist, the
powertrain control module (PCM) cancels the DTC
after 51 engine starts.
Diagnostic trouble codes indicate the results of a
failure, but never identify the failed component di­
rectly.
The circuits of the data link connector are shown in
(Fig. 48).
Fig. 48 Data Link Connector Schematic
ERASING TROUBLE CODES
After the problem has been repaired, use the DRB
scan tool to erase a Diagnostic Trouble Code (DTC). Re­
fer to the appropriate Powertrain Diagnostic Procedures
service manual for operation of the DRB scan tool.
DRB SCAN TOOL
For operation of the DRB scan tool, refer to the ap­
propriate Powertrain Diagnostic Procedures service
manual.
DIAGNOSTIC TROUBLE CODE (DTC)
On the following pages, a list of diagnostic trouble
codes is provided for all gas powered engines. A DTC
indicates that the powertrain control module (PCM)
has recognized an abnormal signal in a circuit or the
system. A DTC may indicate the result of a failure,
but never identify the failed component directly.
DIAGNOSTIC
TROUBLE CODE DESCRIPTIONS
Diagnostic
Trouble Code
DRB Scan Tool Display Description of Diagnostic Trouble Code
11* No Crank Reference Signal at PCM
12* None
13** No Change in M A P From Start to Run
14** M A P Sensor Voltage Too Low
or
M A P Sensor Voltage Too High
No crank reference signal detected during en­
gine cranking.
Direct battery input to P C M was disconnected
within the last 50 Key-on cycles.
No difference recognized between the engine
M A P reading and the barometric (atmospheric)
pressure reading at start-up.
M A P sensor input below minimum acceptable
voltage.
M A P sensor input above maximum acceptable
voltage.
* Check Engine Lamp will not illuminate at all times if this Diagnostic Trouble Code was recorded. Cycle
Ignition key as described in manual and observe code flashed by Check Engine lamp.
** Check Engine Lamp will illuminate during engine operation if this Diagnostic Trouble Code was recorded.