Chrysler 300M Service Manual page 260

8E - 12 ELECTRONIC CONTROL MODULES
POWERTRAIN CONTROL MODULE (Continued)
OPERATION - PCM GROUND
Ground is provided through multiple pins of the
PCM connector. There five different ground pins.
There are engine power grounds and trans power
grounds.
The power grounds are used to control the ground
side of any relay, solenoid, ignition coil or injector.
The NGC case is shielded to prevent RFI and EMI.
The PCM case is grounded and must be firmly
attached to a good, clean body ground.
Internally all grounds are connected together. For
EMI and RFI protection the case is also grounded
separately from the ground pins.
OPERATION - 5 VOLT SUPPLY - PCM OUTPUT
The PCM supplies 5 volts to the following sensors:
• A/C pressure transducer
• Engine coolant temperature sensor
• Manifold absolute pressure sensor
• Throttle position sensor
• Linear EGR solenoid
• Battery temperature
• Knock sensor
• Crankshaft position sensor
• Camshaft position sensor
STANDARD PROCEDURE
STANDARD PROCEDURE - OBTAINING
DIAGNOSTIC TROUBLE CODES
BULB CHECK
Key on: Bulb illuminated until vehicle starts, as
long as all once per trip (readiness) monitors com-
pleted. If monitors have not been completed, then:
Key on: bulb check for about 5 to 8 seconds, lamp
then flashes if once per trip (readiness) monitors
have not been completed until vehicle is started,
then MIL is extinguished.
OBTAINING DTC'S USING DRB SCAN TOOL
(1) Connect the DRB scan tool to the data link
(diagnostic) connector. This connector is located in
the passenger compartment; at the lower edge of
instrument panel; near the steering column.
(2) Turn the ignition switch on and access the
"Read Fault" screen.
(3) Record all the DTC's and "freeze frame" infor-
mation shown on the DRB scan tool.
(4) To erase DTC's, use the "Erase Trouble Code"
data screen on the DRB scan tool. Do not erase any
DTC's until problems have been investigated
and repairs have been performed.
STANDARD PROCEDURE - PINION FACTOR
PROCEDURE
The vehicle speed readings for the speedometer are
taken from the output speed sensor. The PCM must
be calibrated to the different combinations of equip-
ment available. Pinion Factor allows the technician
to set the Powertrain Control Module initial setting
so that the speedometer readings will be correct.
This procedure must be performed if the
Powertrain Control Module has been replaced.
Failure to perform this procedure will result in
an inoperative speedometer.
To properly read or reset the Pinion Factor, it is
necessary to use a DRB scan tool. Perform the follow-
ing steps with the DRB scan tool to read or reset the
Pinion Factor:
(1) Plug the DRB scan tool into the data link con-
nector located under the instrument panel.
(2) Select the Transmission menu.
(3) Select the Miscellaneous menu.
(4) Select Pinion Factor. Then follow the instruc-
tions on the DRB scan tool screen.
STANDARD PROCEDURE - TRANSAXLE QUICK
LEARN PROCEDURE
The quick learn procedure requires the use of the
DRB scan tool. This program allows the electronic
transaxle system to recalibrate itself. This will pro-
vide the best possible transaxle operation. The quick
learn procedure should be performed if any of the fol-
lowing procedures are performed:
• Transaxle Assembly Replacement
• Powertrain Control Module Replacement
• Solenoid/Pressure Switch Assembly Replacement
• Clutch and/or Seal Replacement
• Valve Body Replacement or Recondition
To perform the Quick Learn Procedure, the follow-
ing conditions must be met:
• The brakes must be applied
• The engine speed must be above 500 rpm
• The throttle angle (TPS) must be less than 3
degrees
• The shift lever position must stay in neutral
until prompted to shift to overdrive
• The shift lever position must stay in overdrive
after the Shift to Overdrive prompt until the DRB
indicates the procedure is complete
• The calculated oil temperature must be above
60° and below 200°
(1) Plug the DRB scan tool into the data link con-
nector. The connector is located under the instrument
panel.
(2) Go to the Transmission screen.
(3) Go to the Miscellaneous screen.
LH