Ignition System - Service Information: Other RAM Pickup 2500

ENGINE FIRING ORDER - 3.7L

1 - 6 - 5 - 4 - 3 - 2

Scheme 10

Scheme 11

SPARK PLUGS

Scheme 12

The firing order for the 5.7L is 1-8-4-3-6-5-7-2.

IGNITION COIL RESISTANCE - 3.7L

IGNITION COIL RESISTANCE - 4.7L

IGNITION COIL RESISTANCE - 5.7L

IGNITION TIMING

Ignition timing is not adjustable on any engine.

Scheme 13

One coil capacitor (1) is used. It is located in the right-rear section of the engine compartment.

3.7L

1. Using compressed air, blow out any dirt or contaminants from around top of spark plug.
2. Check the condition of the coil rubber boot (4). To aid in coil installation, apply silicone based grease such as Mopar® Dielectric Grease # J8126688 into the spark plug end of the rubber boot (4) and to the top of the spark plug (5).
3. Position the ignition coil assembly (1) into the cylinder head opening. Using a twisting action, push the ignition coil assembly onto the spark plug.
4. Install coil mounting bolt. Tighten to 8 N.m (70 in.lbs).
5. Connect the electrical connector to the ignition coil assembly (1) by snapping into position.
6. Install the spark plug wires (3).
7. If necessary, install the throttle body air intake tube, or intake air box.

4.7L

1. Using compressed air, blow out any dirt or contaminants from around the top of the spark plug.
2. Check the condition of the coil rubber boot (4). To aid in coil installation, apply silicone based grease such as Mopar® Dielectric Grease # J8126688 into the spark plug end of the rubber boot (4) and to the top of the spark plug (5).
3. Position the ignition coil assembly into the cylinder head opening. Using a twisting action, push the ignition coil assembly onto the spark plug. NOTE: Note: The bolt used to mount the ignition coil assembly is also the same bolt used to mount the intake manifold. If replacing either one or all eight coils, check and re-torque all eight bolts.
4. Tighten the coil assembly mounting bolt (3) to 12 N.m (9 ft. lbs.).
5. Connect the electrical connector (2) to the coil assembly by snapping into position.
6. Connect the secondary cable (3) to the coil assembly (1).
7. If necessary, install the throttle body air intake tube or intake air box to the top of the engine.

5.7L

1. Using compressed air, blow out any dirt or contaminants from around top of spark plug. NOTE: Use dielectric grease on each of the spark plug boots before installing the coil.
2. Position ignition coil (1) into valve cover and push onto spark plugs.
3. Install 2 coil mounting bolts (2). Tighten to 7N.m (62 in.lbs).
4. Connect electrical connector (1) to coil by snapping into position.

Scheme 14

The Camshaft Position Sensor (CMP) (3) is bolted to the right-front side of the right cylinder head (2).

Scheme 15

The Camshaft Position Sensor (CMP) (2) is located below the generator on the timing chain / case cover (1) on the right/front side of engine.

Scheme 16

The Camshaft Position Sensor (CMP) sensor on the 3.7L (3) contains a hall effect device referred to as a sync signal generator. A rotating target wheel (tonewheel) (4) for the CMP is located at the front of the camshaft for the right cylinder head (2). This sync signal generator detects notches (1) located on a tonewheel. As the tonewheel rotates, the notches pass through the sync signal generator. The signal from the CMP sensor is used in conjunction with the Crankshaft Position Sensor (CKP) to differentiate between fuel injection and spark events. It is also used to synchronize the fuel injectors with their respective cylinders.

When the leading edge of the tonewheel notch enters the tip of the CMP, the interruption of magnetic field causes the voltage to switch high, resulting in a sync signal of approximately 5 volts.

When the trailing edge of the tonewheel notch leaves the tip of the CMP, the change of the magnetic field causes the sync signal voltage to switch low to 0 volts.

The CMP sensor engine contains a hall effect device called a sync signal generator to generate a fuel sync signal. This sync signal generator detects notches located on a tonewheel. The tonewheel (4) is located at the front of the camshaft for the right cylinder head (2). As the tonewheel rotates, the notches (1) pass through the sync signal generator. The pattern of the notches (viewed counter-clockwise from front of engine) is: 1 notch, 2 notches, 3 notches, 3 notches, 2 notches, 1 notch, 3 notches and 1 notch. The signal from the CMP sensor is used in conjunction with the crankshaft position sensor to differentiate between fuel injection and spark events. It is also used to synchronize the fuel injectors with their respective cylinders.

The CMP sensor is used in conjunction with the crankshaft position sensor to differentiate between fuel injection and spark events. It is also used to synchronize the fuel injectors with their respective cylinders. The sensor generates electrical pulses. These pulses (signals) are sent to the Powertrain Control Module (PCM). The PCM will then determine crankshaft position from both the camshaft position sensor and crankshaft position sensor.

The tonewheel is located at the front of the camshaft (2). As the tonewheel rotates, notches (3) pass through the sync signal generator.

When the cam gear is rotating, the sensor will detect the notches. Input voltage from the sensor to the PCM will then switch from a low (approximately 0.3 volts) to a high (approximately 5 volts). When the sensor detects a notch has passed, the input voltage switches back low to approximately 0.3 volts.

Scheme 17

The Camshaft Position Sensor (CMP) (3) is bolted to the front/top of the right cylinder head (1).

1. Disconnect electrical connector at CMP sensor.
2. Remove sensor mounting bolt (2).
3. Carefully twist sensor from cylinder head.
4. Check condition of sensor O-ring.

Scheme 18

The Camshaft Position Sensor (CMP) (2) is bolted to the front/top of the right cylinder head (1).

1. Raise and support vehicle.
2. Disconnect electrical connector (4) at CMP sensor.
3. Remove sensor mounting bolt (3).
4. Carefully twist sensor from cylinder head.
5. Check condition of sensor O-ring.

Scheme 19

The Camshaft Position Sensor (CMP) (3) is located on right side of timing gear/chain cover below generator (1).

Scheme 20

1. Disconnect electrical connector (3) at CMP sensor.
2. Remove sensor mounting bolt (3).
3. Carefully twist sensor (2) from timing gear/chain cover.
4. Check condition of sensor O-ring.

1. Clean out machined hole in cylinder head.
2. Apply a small amount of engine oil to sensor O-ring.
3. Install sensor (3) into cylinder head (1) with a slight rocking and twisting action. CAUTION: Before tightening sensor mounting bolt, be sure sensor is completely flush to cylinder head. If sensor is not flush, damage to sensor mounting tang may result.
4. Install mounting bolt (2) and tighten to 12 N.m (106 in. lbs.).
5. Connect electrical connector to sensor.

1. Clean out machined hole in cylinder head.
2. Apply a small amount of engine oil to sensor O-ring.
3. Install sensor (2) into cylinder head (1) with a slight rocking action. Do not twist sensor into position as damage to O-ring may result. CAUTION: Before tightening sensor mounting bolt, be sure sensor is completely flush to cylinder head. If sensor is not flush, damage to sensor mounting tang may result.
4. Install mounting bolt (3) and tighten to 12 N.m (106 in.lbs).
5. Connect electrical connector to sensor.

1. Clean out machined hole in timing gear/chain cover.
2. Install sensor (2) into timing gear/chain cover with a slight rocking action. Do not twist sensor into position as damage to O-ring may result. CAUTION: Before tightening the CMP sensor retaining bolt, be sure the sensor is completely flush to the timing cover. If the sensor is not flush, damage to the sensor mounting tang may result.
3. Install mounting bolt (3) and tighten to 12 N.m (106 in.lbs).
4. Connect electrical connector to sensor.

Note. The left sensor is identified by an identification tag (LEFT) (2). It is also identified by a larger bolt head. The Powertrain Control Module (PCM) must have and know the correct sensor left/right positions. Do not mix the sensor locations.

1. Thoroughly clean knock sensor mounting holes.
2. Install sensors (1) into cylinder block. NOTE: Over or under tightening the sensor mounting bolts will affect knock sensor performance, possibly causing improper spark control. Always use the specified torque when installing the knock sensors. The torque for the knock senor bolt is relatively light for an 8 mm bolt. NOTE: Note foam strip on bolt threads. This foam is used only to retain the bolts to sensors for plant assembly. It is not used as a sealant. Do not apply any adhesive, sealant or thread locking compound to these bolts.
3. Install and tighten mounting bolts. Tighten to 15 +/- 2 ft.lbs. (20 N.m) (176 in.lbs).
4. Connect knock sensor wiring harness to engine harness at rear of intake manifold.
5. Install intake manifold. Refer to «INSTALLATION»(ref-457795-S26066281302012030200000) .

1. Thoroughly clean the knock sensor mounting hole.
2. Position the knock sensor (1) in place. NOTE: Over or under tightening the sensor mounting bolts will affect knock sensor performance, possibly causing improper spark control. Always use the specified torque when installing the knock sensors. NOTE: Note the foam strip on the bolt threads. This foam is used only to retain the bolts to the sensors for plant assembly. It is not used as a sealant. Do not apply any adhesive, sealant or thread locking compound to these bolts.
3. Tighten the knock sensor retaining bolt to 20 N.m (15 ft. lbs.).
4. Connect the knock sensor electrical connector (1) to the engine harness located at the back of the engine.
5. Install the intake manifold. Refer to «MANIFOLD, Intake , Installation , 4.7L»(ref-457796-S15831032312012030200000) .

1. Thoroughly clean the knock sensor(s) mounting hole.
2. Install the knock sensor(s) (1) into the cylinder block. NOTE: Over or under tightening the sensor mounting bolts will affect knock sensors performance, possibly causing improper spark control. Always use the specified torque when installing the knock sensors. The torque for the knock sensor bolt is relatively light for an 8 mm bolt (2). NOTE: Note foam strip on bolt threads. This foam is used only to retain the bolts to sensors for plant assembly. It is not used as a sealant. Do not apply any adhesive, sealant or thread locking compound to these bolts.
3. Position the knock sensor(s) (1), install the retaining bolt(s) (2) and tighten to 20 N.m (15 ft. lbs.).
4. Install the electrical connector(s) (5).

1. Remove the necessary air filter tubing and air intake components at the top of the engine at the throttle body. NOTE: The three spark plugs located on the left bank of the engine are under three individual ignition coils (1). Each individual ignition coil must be removed to gain access to each spark plug located on the left bank of the engine.
2. Prior to removing the ignition coil, spray compressed air around the coil base at the cylinder head.
3. Remove the ignition coil (1) check the condition of ignition coil O-ring and replace as necessary. Refer to «COIL, Ignition , Removal»(ref-457826-S39280970772012030200000) .
4. Prior to removing the spark plug, spray compressed air into the cylinder head opening. This will help prevent foreign material from entering combustion chamber.
5. Remove the spark plug from the cylinder head using a quality thin wall socket with a rubber or foam insert.
6. Inspect the spark plug condition.

1. Remove necessary air filter tubing and air intake components at top of engine and at throttle body. NOTE: To remove the upper row of spark plugs (5), each individual ignition coil (2) must be removed first.
2. Remove the ignition coil(s). Refer to «COIL, Ignition , Removal»(ref-457826-S39280970772012030200000) .
3. Prior to removing the spark plug(s), spray compressed air into cylinder head opening. This will help prevent foreign material from entering combustion chamber. CAUTION: Due to tight clearances between UPPER row of plugs (5) and cylinder head, a conventional deep, thick-wall spark plug socket will not fit. Use a deep, THIN-WALL 5/8α - ? spark plug socket for plug removal and installation. CAUTION: Do not attempt to clean any of the spark plugs. Replace only.
4. Remove the spark plug(s) and inspect their condition.

1. Remove all the necessary air filter tubing and air intake components at the top of the engine and at the throttle body. Refer to «BODY, Air Cleaner , Removal , 5.7L»(ref-457797-S42752377112012030200000) .
2. Prior to removing the ignition coil, spray compressed air around the base of the ignition coil at the cylinder head.
3. Remove the ignition coil (1). Refer to «COIL, Ignition , Removal»(ref-457826-S39280970772012030200000) .
4. Prior to removing the spark plug, spray compressed air into the cylinder head opening.
5. Remove the spark plug from the cylinder head using a quality thin wall socket with a rubber or foam insert.
6. Inspect the spark plug condition.

Scheme 21

1. Check and adjust the spark plug gap with a gap gauging tool (1). Refer to «Specifications»(ref-457826-S40975637062012030200000) . CAUTION: Special care should be taken when installing spark plugs into the cylinder head spark plug wells. Be sure the plugs do not drop into the plug wells as electrodes can be damaged.
2. Start the spark plug into the cylinder head by hand to avoid cross threading.
3. Tighten the spark plugs to 27 N.m (20 ft. lbs.).
4. Before installing the ignition coil (1), check the condition of the coil O-ring and replace as necessary. Apply silicone based grease such as Mopar® Dielectric Grease into the spark plug end of the rubber boot, coil O-rings and to the top of spark plugs.
5. Install the ignition coil (1). Refer to «COIL, Ignition , Installation»(ref-457826-S17328507242012030200000) .
6. Install all the necessary air filter tubing and air intake components at the top of the engine and at the throttle body.

1. To aid in coil installation, apply silicone based grease such as Mopar® Dielectric Grease into spark plug end of rubber boots (4) and (7). Also apply this grease to the tops of spark plugs (5) and (6).
2. Check and adjust spark plug gap(s) with a plug gap gauging tool (1). Refer to «Specifications»(ref-457826-S40975637062012030200000) .
3. Using special care install spark plug(s) into the cylinder head by hand to avoid cross threading.
4. Tighten spark plug(s) to the specified torque. Refer to «Specifications»(ref-457826-S40975637062012030200000) .
5. Install ignition coil(s). Refer to «COIL, Ignition , Installation»(ref-457826-S17328507242012030200000) .
6. Install necessary air filter tubing and air intake components to top of engine and to throttle body.

1. Check and adjust the spark plug gap with a gap gauging tool (1). Refer to «Specifications»(ref-457826-S40975637062012030200000) . CAUTION: Special care should be taken when installing spark plugs into the cylinder head spark plug wells. Be sure the plugs do not drop into the plug wells as electrodes can be damaged.
2. Start the spark plug into the cylinder head by hand to avoid cross threading. NOTE: Always tighten spark plugs to the specified torque. Certain engines use torque sensitive spark plugs. Over tightening can cause distortion resulting in a change in the spark plug gap, or a cracked porcelain insulator. NOTE: Spark plugs have a torque critical tapered design. Do not exceed 20 N.m (15 ft. lbs.).
3. Tighten the spark plugs to 18 N.m (13 ft. lbs.).
4. To aid in coil installation, apply silicone based grease such as Mopar® Dielectric Grease into spark plug end of ignition coil rubber boots. Also apply this grease to the tops of spark plugs.
5. Install the ignition coil(s) (1). Refer to «COIL, Ignition , Installation»(ref-457826-S17328507242012030200000) .
6. Install all necessary air filter tubing and air intake components to top of engine and to throttle body. Refer to «BODY, Air Cleaner , Installation , 5.7L»(ref-457797-S01216084882012030200000) .