8I - Ignition Control - 2012 Jeep Wrangler JK Factory Service Manual

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 top of each spark plug.

OPERATION

The crankshaft position (CKP) sensor and camshaft position (CMP) sensor are hall effect devices. The CMP sensor and CKP sensor generate square wave pulses that are inputs to the powertrain control module (PCM). The PCM determines engine position from these sensors. The PCM calculates injector sequence and ignition timing from crankshaft and camshaft position.

TORQUE

DESCRIPTION	N·m	Ft. Lbs.	In. Lbs.
Camshaft Position Sensor Bolt - 3.6L	9	-	80
Crankshaft Position Sensor Bolt - 3.6L	12	-	106
Ignition Coil Mounting Bolts - 3.6L	8	-	71
Spark Plugs - 3.6L	18	14	-
Ignition Coil Capacitor Bolt - 3.6L	10	-	89
* Knock Sensor - 3.6L	21	15	-
Variable Valve Timing Solenoids - 3.6L	4	-	35
* Do not apply any sealant, thread-locker or adhesive to bolts. Poor sensor performance may result.

SPARK PLUG

Engine	Spark Plug	Electrode Gap
3.6L V-6	RER8ZWYCB4	1.0 mm (.040 in.)

ENGINE FIRING ORDER - 3.6L

The firing order for the 3.6L engine is 1 - 2 - 3 - 4 - 5 - 6.

IGNITION COIL RESISTANCE - 3.6L

PRIMARY RESISTANCE 21-27°C (70-80°F)	SECONDARY RESISTANCE 21-27°C (70-80°F)
0.6 - 0.9 Ohms	6,000 - 9,000 Ohms

IGNITION TIMING

Ignition timing is not adjustable on any of the available engines.