2003 DODGE RAM ignition

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Page 384 of 2895

DODGE RAM 2003  Service Repair Manual ²Cyclic Redundancy Check (CRC) Byte- This
byte is used to detect errors during a message trans-
mission.
²In-Frame Response (IFR) byte(s)-Ifa
response is required from the target module(s), it can
b

Page 386 of 2895

DODGE RAM 2003  Service Repair Manual To avoid possible voltage spike damage to either
the Engine Control Module ECM, ignition key must
be off, and negative battery cables must be discon-
nected before unplugging ECM connectors.
(2) Disco

Page 389 of 2895

DODGE RAM 2003  Service Repair Manual POWERTRAIN CONTROL
MODULE
DESCRIPTION
DESCRIPTION - PCM
The Powertrain Control Module (PCM) is located
in the right-rear section of the engine compartment
under the cowl (Fig. 5).
Two different PCMs

Page 390 of 2895

DODGE RAM 2003  Service Repair Manual ²Battery voltage
²Engine coolant temperature sensor
²Crankshaft position sensor
²Intake manifold air temperature sensor
²Manifold absolute pressure (MAP) sensor
²Throttle position sensor (TPS)

Page 391 of 2895

DODGE RAM 2003  Service Repair Manual the injector pulse width by turning the ground circuit
to each individual injector on and off.
²The PCM monitors the O2S sensor input and
adjusts air-fuel ratio. It also adjusts engine idle
speed thr

Page 392 of 2895

DODGE RAM 2003  Service Repair Manual OPERATION
OPERATION - PCM
The PCM operates the fuel system. The PCM is a
pre-programmed, triple microprocessor digital com-
puter. It regulates ignition timing, air-fuel ratio,
emission control device

Page 393 of 2895

DODGE RAM 2003  Service Repair Manual ²supplies a reference voltage for the Throttle
Position Sensor (TPS) sensor.
Secondary 5±volt supply:
²supplies the required 5 volt power source to the
oil pressure sensor.
²supplies the required

Page 394 of 2895

DODGE RAM 2003  Service Repair Manual (2) Tighten bolts. Refer to torque specifications.
(3) Check pin connectors in the PCM and the three
32±way connectors (four 38±way connectors if
equipped with NGC) for corrosion or damage. Also,
th