Chrysler RAM TRUCK 2500 1994 Service Manual page 972

• Intake manifold air temperature
• Manifold absolute pressure (MAP)
• Throttle position (TPS)
• Transmission gear selection (auto, trans.)
Other P C M Inputs:
• A/C request (if equipped with factory A/C)
• Auto shut down (ASD) sense
• Brake switch
• Camshaft position sensor signal
• Crankshaft position sensor
• Engine coolant temperature sensor
• Ignition circuit sense (ignition switch i n r u n posi­
tion)
• Manifold absolute pressure (MAP) sensor
• Overdrive/override switch
• Park/neutral switch (auto, trans, only)
• SCI receive (DRB scan tool connection)
• Speed control resume switch
• Speed control set switch
• Speed control on/off switch
• Vehicle speed sensor
Powertrain Control Module (PCM) Outputs:
After inputs are received by the PCM, certain com­
ponents are controlled by the PCM. These are consid­
ered P C M Outputs. These outputs are for:
• A/C clutch relay (A/C clutch operation)
• Auto shut down (ASD) relay
• Data link connectors (for DRB and MDS test
equipment)
• EGR valve control solenoid (EET)
• EVAP canister purge solenoid
• Fuel injectors (pulse width)
• Fuel pump relay (electric fuel pump)
• Generator field (charging system operation)
• Idle air control (IAC) motor
• Ignition coil(s) and ignition timing
• Malfunction indicator lamp (Check Engine Lamp)
• Overdrive solenoid electrical operation (auto,
trans, only)
• Overdrive warning lamp (auto, trans, only)
• SCI transmit (DRB scan tool connection)
• Service reminder indicator lamp (EMR lamp)
• Shift indicator lamp (manual transmission only)
• Speed control vacuum solenoid
• Speed control vent solenoid
• Tachometer (on instrument panel, i f equipped)
• Torque convertor clutch electrical operation (auto,
trans, only)
• Transmission oil temperature warning lamp (cer­
tain HD models with auto, trans, only)
SYSTEM DIAGNOSIS
The powertrain control module (PCM) tests many
of its own input and output circuits. I f a diagnostic
trouble code (DTC) is found i n a major system, this
information is stored i n the PCM memory. Refer to
On-Board Diagnostics i n the Multi-Port Fuel
Inj ection—General Diagnosis—Except Diesel section
of this group for DTC information.
PCM SCHEMATICS—EXCEPT DIESEL
Powertrain control system schematics for gas pow­
ered fuel injected engines are shown i n figures 2, 3, 4
and 5. After the schematics, a description is given for
each circuit (pin) of the PCM 60-way connector.