Ignition System - Service Information - 1.4L: Overview Dodge Dart PF

DESCRIPTION

Note. All engines use a fixed ignition timing system. Basic ignition timing is not adjustable. All spark advance is determined by the Powertrain Control Module (PCM).

The ignition system used on these engines is referred to as coil on plug. The system's four main components are the coils, crankshaft position sensor, spark plugs, and camshaft position sensors. The coil on plug ignition system utilizes an ignition coil for every cylinder. The ignition coils are mounted directly over the each spark plug.

OPERATION

The crankshaft position sensor and camshaft position sensor are hall effect devices. The camshaft position sensor and crankshaft position sensor generate square wave pulses that are inputs to the PCM. The PCM determines engine position from these sensors. The PCM calculates injector sequence and ignition timing from crankshaft AND camshaft position.

The ground circuit for the coil within the Automatic Shutdown (ASD) relay is controlled by the Powertrain Control Module (PCM). The PCM operates the ASD relay by switching its ground circuit on and off.

The ASD relay powers a number of critical circuits through the Power Distribution Center (PDC). These circuits include

1. Four ASD feed circuits to the PCM
2. Fuel Injectors
3. Ignition Coils
4. Upstream O2 Sensor Heater
5. Downstream O2 Sensor Heater
6. EVAP Purge (Control) Solenoid

One of the ASD feed circuits is used as an ASD sense so that the PCM can determine if the ASD circuit is powered or not.

A current-carrying semiconductor layer immersed in a normal magnetic field (force lines at right angles to current direction) generates a potential difference known as a Hall voltage at its terminals. If current intensity remains constant, the generated voltage depends on magnetic field intensity alone. Periodic changes in magnetic field intensity are sufficient to generate a modulated electrical signal with frequency proportional to the speed of magnetic field change. The distance between the sensor and the surface of the timing wheel on the cam axis is altered to produce this change.

Scheme 7

Scheme 8

Scheme 9

1. Disconnect and isolate the negative battery cable.
2. Remove the engine cover (1).
3. Remove the air cleaner body (6). Refer to «BODY, AIR CLEANER, REMOVAL»(ref-646215-S35238296702014072800000) .
4. Disconnect the PCV hose (1) from the intake manifold.
5. Disconnect the vent hose (3) from the oil filler neck.
6. Remove three bolts (2) and remove the oil separator housing (4) from the cylinder head cover.
7. Unlock and disconnect the camshaft position (CMP) sensor electrical connector (1).
8. Remove the mounting bolt (2) and camshaft position (CMP) sensor (1).
9. The camshaft position (CMP) sensor O-ring (1) can be reused if not damaged.

The Ignition Node Module is located in the Instrument Panel to the right of the steering wheel. It is used as the main on/off switching device for most electrical components. The Fobik, Push Button or Key is used to engage/disengage the electrical ignition switch.

Vehicles equipped with an automatic transmission and a steering column mounted shifter: an interlock device is located within the shift cable. This interlock device is used to lock the transmission shifter in the PARK position when the key cylinder is in any position and the brake pedal is not depressed.

Scheme 10

1. Disconnect the and isolate the negative battery cable.
2. Remove the dash end cap. Refer to «CAP, INSTRUMENT PANEL END, REMOVAL»(ref-646233-S27390711592014072800000) .
3. Remove the steering column opening cover.
4. Remove the HVAC control head. Refer to «CONTROL, A/C AND HEATER, REMOVAL»(ref-646220-S12652180562014072800000) .
5. Remove the instrument cluster bezel. Refer to «BEZEL, INSTRUMENT CLUSTER, REMOVAL»(ref-646233-S12297661002014072800000) .
6. Disconnect the wire harness connector from the Ignition Node Module.
7. Remove 4 screws from the I/P holding the Ignition Node Module in place.
8. Remove the Ignition Node Module from the backside of the I/P.