Ignition System - Service Information: Other Dodge Durango II рестайлинг

IGNITION SYSTEM - 5.7L

The 5.7L is equipped with 16 spark plugs. Two plugs are used for each cylinder. The 5.7L is also equipped with 8 separate and independent ignition coils. The one-piece coil bolts directly to the cylinder head cover and attaches to the spark plugs.

Two knock sensors (one for each cylinder bank) are used to help control spark knock.

The ignition system consists of

1. 16 Spark Plugs (2 per cylinder)
2. 8 Separate, Ignition Coils
3. 2 Knock Sensors
4. Powertrain Control Module (PCM)
5. Also to be considered part of the ignition system are certain inputs from the Crankshaft Position, Camshaft Position, Throttle Position, 2 knock and MAP Sensors

IGNITION SYSTEM - 4.7L

The 4.7L uses separate ignition coils for each cylinder. The one-piece coil bolts directly to the cylinder head. Rubber boots seal the secondary terminal ends of the coils to the top of all 8 spark plugs. A separate electrical connector is used for each coil.

Because of coil design, spark plug cables (secondary cables) are not used. A distributor is not used.

Two knock sensors (one for each cylinder bank) are used to help control spark knock.

The Auto Shutdown (ASD) relay provides battery voltage to each ignition coil.

The ignition system consists of

1. 8 Spark Plugs
2. 8 Separate Ignition Coils
3. 2 Knock Sensors
4. Powertrain Control Module (PCM)
5. Also to be considered part of the ignition system are certain inputs from the Crankshaft Position, Camshaft Position, Throttle Position, 2 knock and MAP Sensors

IGNITION SYSTEM - 3.7L

The ignition system is controlled by the Powertrain Control Module (PCM) on all engines.

The 3.7L uses separate ignition coils for each cylinder. The one-piece coil bolts directly to the cylinder head. Rubber boots seal the secondary terminal ends of the coils to the top of all 6 spark plugs. A separate electrical connector is used for each coil.

Because of coil design, spark plug cables (secondary cables) and a distributor are not used.

Two knock sensors (one for each cylinder bank) are used to help control spark knock.

The Auto Shutdown (ASD) relay provides battery voltage to each ignition coil.

The ignition system consists of

1. 6 Spark Plugs
2. 6 Separate Ignition Coils
3. 2 Knock Sensors
4. Powertrain Control Module (PCM)
5. Also to be considered part of the ignition system are certain inputs from the Crankshaft Position, Camshaft Position, Throttle Position, 2 knock and MAP Sensors

IGNITION COIL RESISTANCE - 5.7L

IGNITION COIL RESISTANCE - 4.7L

IGNITION COIL RESISTANCE - 3.7L

Scheme 16

These numbers (2) and (3) can also be found on the top of the intake manifold (1) to the right of the throttle body.

Scheme 17

ENGINE FIRING ORDER - 3.7L

The firing order for this engine is 1 - 6 - 5 - 4 - 3 - 2.

IGNITION TIMING

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

SPARK PLUGS

REMOTE START

Remote start uses the key fob to activate which sends a signal to the SKREEM module, CAN B bus and to the TIPM module to start the vehicle.

Remote engine off is activated by a sequence of button activations (Pushes). This sequence must be completed within 5 seconds of the start. The sequence 5 second remote start timer are started when the remote start button is activated and the remote start timer is not running. The first step of the sequence is completed by having a remote start button activated with the remote start timer not running. The second step is to have no buttons active (pressed). The third step (which must take place within 5 seconds of the start condition, is the reactivation of the remote start button. Upon the third step being met, the FOB will transmit the remote off message. The start timer is forced to be timed out.

Remote start is activated by a sequence of button activations (pushes). This sequence must be completed within 5 seconds of the start. The sequence 5 second timer are started when the lock button is activated and the remote start timer not running. The first step of the sequence is completed by having a lock button activated with the remote start timer not running. The second step is to have no buttons active (pressed). The third step is the activation of the remote start button. The fourth step is to have no buttons active (pressed). The fifth step 5 seconds of the remote start condition, is the reactivation of the remote start button. Upon the fifth step being met, the FOB will transmit the remote start message, and the remote start timer is forced to be timed out.

AUTO SHUTDOWN (ASD) RELAY - PCM OUTPUT

The 5-pin, 12-volt, Automatic Shutdown (ASD) relay is located in the Power Distribution Center (PDC). Refer to label on PDC cover for relay location.

The ASD relay supplies battery voltage (12+ volts) to the fuel injectors and ignition coil(s). With certain emissions packages it also supplies 12-volts to the oxygen sensor heating elements.

The ground circuit for the coil within the 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 will be shut-down, meaning the 12-volt power supply to the ASD relay will be deactivated by the PCM if

1. The ignition key is left in the ON position. This is if the engine has not been running for approximately 1.8 seconds.
2. There is a crankshaft position sensor signal to the PCM that is lower than predetermined values.

AUTOMATIC SHUTDOWN (ASD) RELAY SENSE - PCM INPUT

A 12 volt signal at this input indicates to the PCM that the ASD has been activated. The relay is used to connect the oxygen sensor heater element, ignition coil and fuel injectors to 12 volt + power supply.

This input is used only to sense that the ASD relay is energized. If the Powertrain Control Module (PCM) does not see 12 volts at this input when the ASD should be activated, it will set a Diagnostic Trouble Code (DTC).

AUTOMATIC SHUTDOWN (ASD) RELAY

The ASD relay is located in the engine compartment within the Power Distribution Center (PDC). Refer to label on PDC cover for relay location.

1. Remove PDC cover.
2. Remove relay from PDC.
3. Check condition of relay terminals and PDC connector terminals for damage or corrosion. Repair if necessary before installing relay.
4. Check for pin height (pin height should be the same for all terminals within the PDC connector). Repair if necessary before installing relay.

The ASD relay is located in the Power Distribution Center (PDC). Refer to label on PDC cover for relay location.

1. Install relay to PDC.
2. Install cover to PDC.

Scheme 18

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

Scheme 19

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.

GAS ENGINES - 5.7L

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.

GAS ENGINES - 4.7L

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 counterclockwise 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.

Scheme 20

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.

Scheme 21

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 22

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 23

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

Scheme 24

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 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 sensor mounting bolt, be sure sensor is completely flush to timing gear/chain cover. If sensor is not flush, damage to 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.

GAS ENGINES - 3.7L

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.

Scheme 25

The 4.7L uses 8 dedicated, and individually fired coil (1) for each spark plug. Each coil is mounted directly to the top of each spark plug.

Scheme 26

The 3.7L engine uses 6 dedicated, and individually fired coils (1) for each spark plug.

Scheme 27

Each coil (1) is mounted directly into the cylinder head and onto the top of each spark plug.

Scheme 28

The 5.7L engine uses 8 dedicated and individually fired coils (3) for each pair of spark plugs.

Each coil (3) is mounted directly to the top of each spark plug. Each coil is bolted (2) to the valve cover (4).

COIL-IGNITION - 5.7L

The ignition system is controlled by the Powertrain Control Module (PCM) on all engines.

The 5.7L engine uses dual output coils, and 2 spark plugs per cylinder.

Each cylinder is equipped with 1 dual-output coil. Meaning one coil mounts directly over one of the dual spark plugs for 1 high-voltage output.

Battery voltage is supplied to all of the ignition coils positive terminals from the ASD relay. If the PCM does not see a signal from the crankshaft and camshaft sensors (indicating the ignition key is ON but the engine is not running), it will shut down the ASD circuit.

Base ignition timing is not adjustable. By controlling the coil ground circuits, the PCM is able to set the base timing and adjust the ignition timing advance. This is done to meet changing engine operating conditions.

The PCM adjusts ignition timing based on inputs it receives from

1. The engine coolant temperature sensor
2. The crankshaft position sensor (engine speed)
3. The camshaft position sensor (crankshaft position)
4. The manifold absolute pressure (MAP) sensor
5. The throttle position sensor
6. Transmission gear selection

COIL-IGNITION - 3.7L/4.7L

Battery voltage is supplied to the six individual ignition coils from the ASD relay. The Powertrain Control Module (PCM) opens and closes each ignition coil ground circuit at a determined time for ignition coil operation.

Base ignition timing is not adjustable. By controlling the coil ground circuit, the PCM is able to set the base timing and adjust the ignition timing advance. This is done to meet changing engine operating conditions.

The ignition coil is not oil filled. The windings are embedded in an epoxy compound. This provides heat and vibration resistance that allows the ignition coil to be mounted on the engine.

Because of coil design, spark plug cables (secondary cables) are not used.

COIL-IGNITION - 3.7L

An individual ignition coil (1) is used for each spark plug. The coil fits into machined holes in the cylinder head. A mounting stud/nut secures each coil to the top of the intake manifold. The bottom of the coil is equipped with a rubber boot to seal the spark plug to the coil. Inside each rubber boot is a spring. The spring is used for a mechanical contact between the coil and the top of the spark plug. These rubber boots and springs are a permanent part of the coil and are not serviced separately. An O-ring (2) is used to seal the coil at the opening into the cylinder head.

Scheme 29

1. Depending on which coil is being removed, the throttle body air intake tube or intake box may need to be removed to gain access to coil.
2. Disconnect electrical connector from coil by pushing downward on release lock on top of connector and pull connector from coil.
3. Clean area at base of coil with compressed air before removal.
4. Remove coil mounting nut (2) from mounting stud.
5. Carefully pull up coil from cylinder head opening with a slight twisting action.
6. Remove coil from vehicle.

Scheme 30

1. Disconnect the electrical connector (1) from coil (3).
2. Clean area at base of coil with compressed air before removal.
3. Remove two mounting bolts (2) (note that mounting bolts are retained to coil).
4. Carefully pull up coil (1) from valve cover.
5. Remove coil (1) from vehicle.

COIL-IGNITION - 4.7L

An individual ignition coil (1) is used for each spark plug. The coil fits into machined holes in the cylinder head. A mounting stud/nut (3) secures each coil to the top of the intake manifold. The bottom of the coil is equipped with a rubber boot to seal the spark plug to the coil. Inside each rubber boot is a spring. The spring is used for a mechanical contact between the coil and the top of the spark plug. These rubber boots and springs are a permanent part of the coil and are not serviced separately. An O-ring is used to seal the coil at the opening into the cylinder head.

1. Depending on which coil is being removed, the throttle body air intake tube or intake box may need to be removed to gain access to coil.
2. Disconnect electrical connector (2) from coil by pushing downward on release lock on top of connector and pull connector from coil.
3. Clean area at base of coil with compressed air before removal.
4. Remove coil mounting nut (3) from mounting stud.
5. Carefully pull up coil from cylinder head opening with a slight twisting action.
6. Remove coil from vehicle.

1. Using compressed air, blow out any dirt or contaminants from around top of spark plug.
2. Check condition of coil O-ring (2) and replace as necessary. To aid in coil installation, apply silicone to coil O-ring (2).
3. Position ignition coil into cylinder head opening and push onto spark plug. Do this while guiding coil base over mounting stud.
4. Install coil mounting stud nut (3). Tighten to 8 N.m (70 in. lbs).
5. Connect electrical connector (2) to coil by snapping into position.
6. If necessary, install throttle body air tube.

Scheme 31

1. Using compressed air, blow out any dirt or contaminants from around top of spark plug.
2. Check condition of coil O-ring (2) and replace as necessary. To aid in coil installation, apply silicone to coil O-ring (2).
3. Position ignition coil (1) into cylinder head opening and push onto spark plug. Do this while guiding coil base over mounting stud.
4. Install coil mounting stud nut (2). Tighten to 8 N.m (70 in. lbs).
5. Connect electrical connector to coil by snapping into position.
6. If necessary, install throttle body air tube.

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 7 N.m (62 in. lbs.).
4. Connect electrical connector (1) to coil by snapping into position.

SENSOR-KNOCK

Two knock sensors are bolted into the cylinder block under the intake manifold 3.7L & 4.7L.

Two knock sensors are also used with the 5.7L . These are bolted into each side of the cylinder block (outside) under the exhaust manifold.

Two knock sensors are used; one for each cylinder bank. When the knock sensor detects a knock in one of the cylinders on the corresponding bank, it sends an input signal to the Powertrain Control Module (PCM). In response, the PCM retards ignition timing for all cylinders by a scheduled amount.

Knock sensors contain a piezoelectric material which constantly vibrates and sends an input voltage (signal) to the PCM while the engine operates. As the intensity of the crystal's vibration increases, the knock sensor output voltage also increases.

The voltage signal produced by the knock sensor increases with the amplitude of vibration. The PCM receives the knock sensor voltage signal as an input. If the signal rises above a predetermined level, the PCM will store that value in memory and retard ignition timing to reduce engine knock. If the knock sensor voltage exceeds a preset value, the PCM retards ignition timing for all cylinders. It is not a selective cylinder retard.

The PCM ignores knock sensor input during engine idle conditions. Once the engine speed exceeds a specified value, knock retard is allowed.

Knock retard uses its own short term and long term memory program.

Long term memory stores previous detonation information in its battery-backed RAM. The maximum authority that long term memory has over timing retard can be calibrated.

Short term memory is allowed to retard timing up to a preset amount under all operating conditions (as long as RPM is above the minimum RPM) except at Wide Open Throttle (WOT). The PCM, using short term memory, can respond quickly to retard timing when engine knock is detected. Short term memory is lost any time the ignition key is turned off.

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.

Scheme 32

Two sensors (1) are used. Each sensor is bolted into the outside of cylinder block below the exhaust manifold (3).

1. Raise vehicle.
2. Disconnect knock sensor electrical connector (5).
3. Remove sensor mounting bolt (2). 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.
4. Remove sensor from engine.

Scheme 33

The two knock sensors (1) are bolted into the cylinder block under the intake manifold. The two sensors share a common wiring harness using one electrical connector (3). Because of this, they must be replaced as a pair.

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. Remove intake manifold. Refer to «REMOVAL»(ref-285333-S42805090622008052100000) .
2. Disconnect knock sensor dual pigtail harness from engine wiring harness. This connection is made near rear of engine.
3. Remove both sensor mounting bolts. 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.
4. Remove sensors from engine.

Scheme 34

The two knock sensors (1) are bolted into the cylinder block under the intake manifold (3).

Note. The left sensor is identified by an identification tag (LEFT). 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. Disconnect knock sensor dual pigtail harness from engine wiring harness. This connection is made near rear of engine.
2. Remove intake manifold. Refer to «REMOVAL»(ref-285400-S21804404252008052100000) .
3. Remove sensor mounting bolts (2). 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.
4. Remove sensors (1) from engine.

SENSOR-KNOCK - 4.7L

Note. The left sensor is identified by an identification tag (LEFT). 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 sensor 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. Install intake manifold. Refer to «INSTALLATION»(ref-285400-S06714966172008052100000) .
5. Connect knock sensor wiring harness to engine harness (4) at rear of intake manifold.

SENSOR-KNOCK - 3.7L

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-285333-S10425488812008052100000) .

SENSOR-KNOCK - 5.7L

1. Thoroughly clean knock sensor mounting hole.
2. Install sensor (1) into cylinder block (3). 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 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. Install and tighten mounting bolt (2). Tighten to 15 +/- 2 ft. lbs. (20 N.m) (176 in. lbs.).
4. Install electrical connector to sensor (5).

Resistor type spark plugs are used on all engines.

Sixteen spark plugs (2 per cylinder) are used with 5.7L engines.

Each individual spark plug is located under each ignition coil. Each individual ignition coil must be removed to gain access to each spark plug. See REMOVAL .

1. Remove necessary air filter tubing at throttle body.
2. Prior to removing ignition coil, spray compressed air around coil base at cylinder head.
3. Prior to removing spark plug, spray compressed air into cylinder head opening. This will help prevent foreign material from entering combustion chamber.
4. Remove spark plug from cylinder head using a quality socket with a rubber or foam insert. Also check condition of ignition coil O-ring and replace as necessary.
5. Inspect spark plug condition.

Scheme 35

The plugs may be cleaned using commercially available spark plug cleaning equipment. After cleaning, file center electrode flat with a small point file or jewelers file before adjusting gap.

Adjust spark plug gap with a gap gauging tool (1).

Note. The 4.7L is equipped with copper core ground electrode spark plugs. They must be replaced with the same type/number spark plug as the original. If another spark plug is substituted, pre-ignition will result.

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.

Always tighten spark plugs to the specified torque. Over tightening can cause distortion resulting in a change in the spark plug gap or a cracked porcelain insulator.

1. Start the spark plug into the cylinder head by hand to avoid cross threading.
2. Tighten spark plugs to 27 N.m (20 ft. lbs.). 3.7L & 4.7L.
3. The 5.7L is equipped with torque critical design spark plugs. Do not exceed 15 ft. lbs. torque. Tighten spark plugs to 18 N.m (13 ft. lbs). NOTE: 5.7L does not use an o-ring
4. Before installing ignition coil(s), check condition of coil O-ring and replace as necessary. To aid in coil installation, apply silicone to coil O-ring.
5. Install ignition coil(s). See «INSTALLATION»(ref-285362-S38520510432008052100000) .

Scheme 36

The ignition switch (1) is located on the steering column. It is used as the main on/off switching device for most electrical components. The mechanical key cylinder is used to engage/disengage the electrical ignition switch.

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.

SERVICE PRECAUTIONS

Safety goggles should be worn at all times when working on steering columns.

To service the steering wheel, switches or airbag, refer to RESTRAINTS - SERVICE INFORMATION article and follow all WARNINGS and CAUTIONS.

Scheme 37

Scheme 38

Scheme 39

Scheme 40

Scheme 41

1. Remove the steering column opening cover (2).
2. Remove the steering column opening reinforcement (1). The ignition key must be in the key cylinder for cylinder removal. The key cylinder must be removed first before removing ignition switch.
3. Remove the negative (ground) cable from the battery.
4. Disable the airbag, refer to «REMOVAL»(ref-285335-S24703065292008052100000) .
5. Remove the lower and upper shrouds (1 & 2).
6. Remove key cylinder. Refer to «REMOVAL»(ref-285324-S42414599012008052100000) .
7. Disconnect the lower clockspring connectors.
8. Remove the wire retainer from the tilt lever bracket (2).
9. Remove the tilt lever mounting screws to gain access to the ignition switch mounting screws.
10. Disconnect the electrical connector at rear of ignition switch (1).
11. Remove ignition switch mounting screws (2).
12. Using a small screwdriver, push on locking tab and remove switch from steering column.

Scheme 42

Scheme 43

1. Before installing ignition switch (1), rotate the slot in the switch to the ON position.
2. Connect the electrical connector to rear of the ignition switch. Make sure that locking tabs are fully seated into wiring connector.
3. Position switch to column and install the mounting screws (2). Tighten screw to 3 N.m (26 in. lbs.).
4. Install the tilt lever bracket (2) mounting screws. Tighten screws to 4.5 N.m (40 in. lbs.).
5. Position the wire retainer into the tilt lever bracket.
6. Reconnect the lower clockspring connectors.
7. Install the steering column opening reinforcement (1).
8. Install the steering column opening cover (2).
9. Install the key cylinder (1) with the key (2) in the cylinder (1).
10. Install steering column upper and lower shrouds (2).
11. Install the tilt lever knob (1).
12. Enable the airbag system. Refer to «INSTALLATION»(ref-285335-S00011076182008052100000) .

KEY-IN IGNITION SWITCH

The key-in ignition switch is integral to the ignition switch, which is mounted on the left side of the steering column. It closes a path to ground for the Central Timer Module (CTM) when the ignition key is inserted in the ignition key cylinder and the driver door ajar switch is closed (driver door is open). The key-in ignition switch opens the ground path when the key is removed from the ignition key cylinder. The ground path is also opened when the driver door ajar switch is open (driver door is closed).

The key-in ignition switch cannot be repaired and, if faulty or damaged, the entire ignition switch must be replaced, refer to REMOVAL .