Dakota 2WD V8-4.7L Flex Fuel (2009)
-
A/C clutch relay
-
Auto shutdown (ASD) relay
-
CAN bus (+/-) circuits for: speedometer, voltmeter, fuel gauge, oil pressure gauge/lamp, engine temp. gauge and speed control warn. lamp
-
Data link connection for diagnostic scan tool
-
Double start override (if equipped)
-
EGR valve control solenoid (if equipped)
-
Electronic throttle control
-
EVAP canister purge solenoid
-
Five volt sensor supply (primary)
-
Five volt sensor supply (secondary)
-
Fuel injectors
-
Fuel pump relay
-
Generator field driver (-)
-
Generator field driver (+)
-
Generator lamp (if equipped)
-
Idle air control (IAC) motor
-
Ignition coil(s)
-
CAN bus circuits
-
Leak detection pump (if equipped)
-
Natural Vacuum Leak Detection (NVLD) pump (if equipped)
-
Malfunction indicator lamp (Check engine lamp). Driven through CAN bus circuits.
-
Overdrive indicator lamp (if equipped)
-
Radiator cooling fan (if equipped)
-
Speed control vacuum solenoid
-
Speed control vent solenoid
-
Starter relay
-
Tachometer (if equipped). Driven through CAN bus circuits.
-
Transmission convertor clutch circuit
-
Transmission 3-4 shift solenoid
-
Transmission relay
-
Transmission temperature lamp (if equipped)
-
Transmission variable force solenoid
DESCRIPTION - MODES OF OPERATION
The PCM will operate in two different modes: Open Loop and Closed Loop.
During Open Loop modes, the PCM receives input signals and responds only according to preset PCM programming. Input from the oxygen (O2S)
sensors is not monitored during Open Loop modes.
During Closed Loop modes, the PCM will monitor the oxygen (O2S) sensors input. This input indicates to the PCM whether or not the calculated
injector pulse width results in the ideal air-fuel ratio. This ratio is 14.7 parts air-to-1 part fuel. By monitoring the exhaust oxygen content through the
O2S sensor, the PCM can fine tune the injector pulse width. This is done to achieve optimum fuel economy combined with low emission engine
performance.
The fuel injection system has the following modes of operation:
-
Ignition switch ON
-
Engine start-up (crank)
-
Engine warm-up
-
Idle
-
Cruise
-
Acceleration
-
Deceleration
-
Wide open throttle (WOT)
-
Ignition switch OFF
The ignition switch On, engine start-up (crank), engine warm-up, acceleration, deceleration and wide open throttle modes are Open Loop modes. The
idle and cruise modes, (with the engine at operating temperature) are Closed Loop modes.
ENGINE START-UP MODE
This is an Open Loop mode. The following actions occur when the starter motor is engaged.
The PCM receives inputs from:
