Dodge Ignition Control Service Manual

DR IGNITION CONTROL 8I - 1

IGNITION CONTROL

TABLE OF CONTENTS

page page

IGNITION CONTROL

DESCRIPTION ..........................1

SPECIFICATIONS

SPECIFICATIONS - TORQUE - IGNITION ....3

ENGINE FIRING ORDER - 3.7L V-6 .........4

ENGINE FIRING ORDER – 4.7L V-8 ........4

FIRING ORDER / CABLE ROUTING – 5.7L

V-8 ENGINE...........................4

ENGINE FIRING ORDER - 5.9L V-8 .........4

SPARK PLUG CABLE ORDER – 8.0L V-10

ENGINE..............................5

SPARK PLUG CABLE RESISTANCE ........5

SPARK PLUGS ........................5

IGNITION COIL RESISTANCE - 3.7L V-6 .....6

IGNITION COIL RESISTANCE - 4.7L V-8 .....6

IGNITION COIL RESISTANCE - 5.7L V-8 .....6

IGNITION COIL RESISTANCE - 5.9L ........6

IGNITION COIL RESISTANCE – 8.0L V-10

ENGINE..............................6

IGNITION TIMING ......................6

AUTOMATIC SHUT DOWN RELAY

DESCRIPTION - PCM OUTPUT .............6

OPERATION

OPERATION - PCM OUTPUT .............6

OPERATION - ASD SENSE - PCM INPUT ....6

DIAGNOSIS AND TESTING - ASD AND FUEL

PUMP RELAYS ........................7

REMOVAL .............................7

INSTALLATION ..........................8

CAMSHAFT POSITION SENSOR

DESCRIPTION ..........................8

OPERATION ............................8

REMOVAL .............................11

INSTALLATION .........................14

DISTRIBUTOR

DESCRIPTION .........................16

OPERATION ...........................16

REMOVAL .............................17

INSTALLATION .........................18

DISTRIBUTOR CAP

DIAGNOSIS AND TESTING - DISTRIBUTOR

CAP - 5.9L V-8 ........................18

DISTRIBUTOR ROTOR

DIAGNOSIS AND TESTING - DISTRIBUTOR

ROTOR - 5.9L V-8 .....................19

IGNITION COIL

DESCRIPTION .........................19

OPERATION ...........................20

REMOVAL .............................23

INSTALLATION .........................24

KNOCK SENSOR

DESCRIPTION .........................25

OPERATION ...........................25

REMOVAL .............................25

INSTALLATION .........................26

SPARK PLUG

DESCRIPTION .........................27

DIAGNOSIS AND TESTING - SPARK PLUG

CONDITIONS .........................27

REMOVAL .............................30

CLEANING

CLEANING AND ADJUSTMENT ...........31

INSTALLATION .........................31

IGNITION COIL CAPACITOR

DESCRIPTION .........................33

OPERATION ...........................33

REMOVAL .............................33

INSTALLATION .........................33

SPARK PLUG CABLE

DESCRIPTION .........................33

OPERATION ...........................33

DIAGNOSIS AND TESTING - SPARK PLUG

CABLES ............................33

REMOVAL .............................34

INSTALLATION .........................35

IGNITION CONTROL

DESCRIPTION

The ignition system is controlled by the Powertrain

Control Module (PCM) on all engines.

3.7L V-6 ENGINE

The 3.7L V-6 engine uses a separate ignition coil

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) are not used. A distributor is not used with the 3.7L engine.

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

8I - 2 IGNITION CONTROL DR

IGNITION CONTROL (Continued)

The Auto Shutdown (ASD) relay provides battery

voltage to each ignition coil.

The ignition system consists of:

• 6 Spark Plugs

• 6 Separate Ignition Coils

• 2 Knock Sensors

• Powertrain Control Module (PCM)

• 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

4.7L V-8 ENGINE

The 4.7L V-8 engine uses a separate ignition coil 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 with the 4.7L engine.

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:

• 8 Spark Plugs

• 8 Separate Ignition Coils

• 2 Knock Sensors

• Powertrain Control Module (PCM)

• 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

and 5/8. These numbers can also be found on the top of the intake manifold to the right of the throttle body (Fig. 1).

Two knock sensors (one for each cylinder bank) are

used to help control spark knock.

The 5.7L engine will not use a conventional distrib-

utor.

The ignition system consists of:

• 16 Spark Plugs (2 per cylinder)

•

8 Separate, Dual-Secondary Output, Ignition Coils

• 2 Knock Sensors

• 8 Secondary Ignition Cables

• Powertrain Control Module (PCM)

• 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

5.7L V-8 ENGINE

For additional information, also refer to Ignition Coil Description and Operation.

The 5.7L V-8 engine 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 the coils secondary output terminal directly to a spark plug using a rubber boot seal. Each coil is also equipped with a second output terminal. This second terminal connects a conventional spark plug cable directly to a spark plug on the opposite cylinder bank. A separate primary electrical connector is used for each coil.

Eight conventional spark plug cables are used with the 5.7L. These cables connect a coil on one cylinder bank, directly to a spark plug on the opposite cylinder bank. The cables are placed and routed in a special plastic loom to keep them separated. This loom is clipped to the intake manifold. To prevent a missmatch of cables, a corresponding spark plug / coil number is displayed on each plug cable: 1/6, 2/3, 4/7

Fig. 1 FIRING ORDER / CABLE ROUTING - 5.7L V-8

ENGINE

1 - TOP OF INTAKE MANIFOLD 2 - CYLINDER FIRING ORDER (IGNITION COIL NUMBER) 3 - CORRESPONDING SPARK PLUG NUMBER

5.9L V-8 ENGINE

The 5.9L V-8 ignition system will use a conventional distributor and 1 remotely mounted coil. Conventional spark plug cables are used with the 5.9L.

Knock sensors are not used with the 5.9L engine.

The ignition system consists of:

• 8 Spark Plugs

• 1 Ignition Coil

• Secondary Ignition Cables

• Distributor (contains rotor and camshaft position

sensor)

• Powertrain Control Module (PCM)

DR IGNITION CONTROL 8I - 3

IGNITION CONTROL (Continued)

•

Also to be considered part of the ignition system are certain inputs from the Crankshaft Position, Camshaft Position, Throttle Position and MAP Sensors

8.0L V-10 ENGINE

. The 8.0L V-10 engine is equipped with 2 remote coil packs. Conventional spark plug cables are used with the 8.0L engine. The 8.0L engine will not use a conventional distributor

The ignition coils are individually fired, but each coil is a dual output. Refer to Ignition Coil for additional information.

Knock sensors are not used with the 8.0L engine. The ignition system consists of:

• 10 Spark Plugs

• 2 Ignition Coil packs containing 10 individual

coils

• 10 Secondary Ignition Cables

• Powertrain Control Module (PCM)

• Also to be considered part of the ignition system

are certain inputs from the Crankshaft Position, Camshaft Position, Throttle Position and MAP Sensors

SPECIFICATIONS

SPECIFICATIONS - TORQUE - IGNITION

DESCRIPTION N·m Ft. Lbs. In. Lbs.

Camshaft Position Sensor - 3.7L V-6 Engine 12 - 106 Camshaft Position Sensor - 4.7L V-8 Engine 12 - 106

Camshaft Position Sensor - 5.7L V-8 Engine 12 9 105 Camshaft Position Sensor - 8.0L V-10 Engine 6 - 50 Crankshaft Position Sensor - 3.7L V-6 Engine 28 21 205 Crankshaft Position Sensor - 4.7L V-8 Engine 28 21 205 Crankshaft Position Sensor - 5.7L V-8 Engine 12 9 105 Crankshaft Position Sensor - 5.9L V-8 Engine 8 - 70

Crankshaft Position Sensor - 8.0L V-10 Engine 8 - 70

Distributor Hold Down Bolt - 5.9L V-8 Engine 23 17 -

Ignition Coil Mounting - 5.9L V-8 Engine

(if tapped bolts are used)

Ignition Coil Mounting - 5.9L V-8 Engine

(if nuts/bolts are used) Ignition Coil Mounting - 3.7L V-6 Engine 8 - 70 Ignition Coil Mounting - 4.7L V-8 Engine 8 - 70 Ignition Coil Mounting - 5.7L V-8 Engine 12 9 105 (± 20)

Ignition Coil Mounting - 8.0L V-10 Engine 10 - 90

* Knock Sensor - 3.7L V-6 Engine 20 15 176 * Knock Sensor - 4.7L V-8 Engine 20 15 176 * Knock Sensor - 5.7L V-8 Engine 20 15 176

Spark Plugs - 3.7L V-6 Engine 27 20 Spark Plugs - 4.7L V-8 Engine 27 20 -

** Spark Plugs - 5.7L V-8 Engine 18 (± 3) 13 (± 2) -

Spark Plugs - 5.9L V-8 Engine 41 30 -

Spark Plugs - 8.0L V-10 Engine 41 30 -

* Do not apply any sealant, thread-locker or adhesive to bolts. Poor sensor performance may result.

** Torque critical tapered design. Do not exceed 15 ft. lbs.

5-50

11 - 100

8I - 4 IGNITION CONTROL DR

IGNITION CONTROL (Continued)

ENGINE FIRING ORDER - 3.7L V-6

1-6-5-4-3-2

ENGINE FIRING ORDER – 4.7L V-8

FIRING ORDER / CABLE ROUTING – 5.7L V-8 ENGINE

Fig. 2 FIRING ORDER / CABLE ROUTING - 5.7L V-8

ENGINE

1 - TOP OF INTAKE MANIFOLD 2 - CYLINDER FIRING ORDER (IGNITION COIL NUMBER) 3 - CORRESPONDING SPARK PLUG NUMBER

ENGINE FIRING ORDER - 5.9L V-8

DR IGNITION CONTROL 8I - 5

IGNITION CONTROL (Continued)

SPARK PLUG CABLE ORDER – 8.0L V-10 ENGINE

SPARK PLUG CABLE RESISTANCE

MINIMUM MAXIMUM

250 Ohms Per Inch 1000 Ohms Per Inch

3000 Ohms Per Foot 12,000 Ohms Per Foot

SPARK PLUGS

ENGINE PLUG TYPE ELECTRODE GAP

3.7L V-6 ZFR6F - 11G (NGK) 1.1 (0.042 in.)

4.7L V-8 RC12MCC4 1.01 mm (.040 in.)

5.7L V-8 Champion - RE14MCC4 1.14 mm (.045 in.)

5.9L V-8 RC12LC4 1.01 mm (.040 in.)

8.0L V-10 QC9MC4 1.14 mm (.045 in.)

8I - 6 IGNITION CONTROL DR

IGNITION CONTROL (Continued)

IGNITION COIL RESISTANCE - 3.7L V-6

PRIMARY RESISTANCE

21-27°C (70-80°F)

0.6 - 0.9 Ohms 6,000 - 9,000 Ohms

SECONDARY

RESISTANCE 21-27°C

(70-80°F)

IGNITION COIL RESISTANCE - 4.7L V-8

PRIMARY

RESISTANCE 21-27°C

(70-80°F)

0.6 - 0.9 Ohms 6,000 - 9,000 Ohms

SECONDARY

RESISTANCE 21-27°C

(70-80°F)

IGNITION COIL RESISTANCE - 5.9L

COIL MANUFACTURER

Diamond 0.97 - 1.18 Ohms 11,300 - 15,300 Ohms

Toyodenso 0.95 - 1.20 Ohms 11,300 - 13,300 Ohms

PRIMARY RESISTANCE

21-27°C (70-80°F)

IGNITION COIL RESISTANCE - 5.7L V-8

PRIMARY RESISTANCE @ 21-27°C (70-80°F)

0.558 - 0.682 Ohms

(Plus or Minus 10% @ 70-80° F)

SECONDARY RESISTANCE 21-27°C

(70-80°F)

IGNITION COIL RESISTANCE – 8.0L V-10 ENGINE

Primary Resistance: 0.53-0.65 Ohms. Test across the primary connector. Refer to text for test procedures.

Secondary Resistance: 10.9-14.7K Ohms. Test across the individual coil towers. Refer to text for test procedures.

IGNITION TIMING

Ignition timing is not adjustable on any engine.

AUTOMATIC SHUT DOWN RELAY

DESCRIPTION - 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.

OPERATION

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 de-activated by the PCM if:

• the ignition key is left in the ON position. This is if the engine has not been running for approximately 1.8 seconds.

• there is a crankshaft position sensor signal to the PCM that is lower than pre-determined values.

OPERATION - ASD 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).

OPERATION - PCM OUTPUT

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.

DR IGNITION CONTROL 8I - 7

AUTOMATIC SHUT DOWN RELAY (Continued)

DIAGNOSIS AND TESTING - ASD AND FUEL PUMP RELAYS

The following description of operation and tests apply only to the Automatic Shutdown (ASD) and fuel pump relays. The terminals on the

bottom of each relay are numbered. Two different types of relays may be used, (Fig. 3) or (Fig. 4).

Fig. 3 TYPE 1 RELAY (ISO MICRO RELAY)

• Terminal number 86 supplies voltage to the coil

side of the relay.

• When the PCM de-energizes the ASD and fuel pump relays, terminal number 87A connects to terminal 30. This is the Off position. In the off position, voltage is not supplied to the rest of the circuit. Terminal 87A is the center terminal on the relay.

• When the PCM energizes the ASD and fuel pump relays, terminal 87 connects to terminal 30. This is the On position. Terminal 87 supplies voltage to the rest of the circuit.

The following procedure applies to the ASD and

fuel pump relays.

(1) Remove relay from connector before testing.

(2) With the relay removed from the vehicle, use an ohmmeter to check the resistance between terminals 85 and 86. The resistance should be 75 ohms +/5 ohms.

(3) Connect the ohmmeter between terminals 30 and 87A. The ohmmeter should show continuity between terminals 30 and 87A.

(4) Connect the ohmmeter between terminals 87 and 30. The ohmmeter should not show continuity at this time.

(5) Connect one end of a jumper wire (16 gauge or smaller) to relay terminal 85. Connect the other end of the jumper wire to the ground side of a 12 volt power source.

(6) Connect one end of another jumper wire (16 gauge or smaller) to the power side of the 12 volt power source. Do not attach the other end of the

jumper wire to the relay at this time.

Fig. 4 ASD AND FUEL PUMP RELAY TERMINALS—

TYPE 2

TERMINAL LEGEND

NUMBER IDENTIFICATION

30 COMMON FEED 85 COIL GROUND 86 COIL BATTERY 87 NORMALLY OPEN

87A NORMALLY CLOSED

• Terminal number 30 is connected to battery voltage. For both the ASD and fuel pump relays, terminal 30 is connected to battery voltage at all times.

• The PCM grounds the coil side of the relay through terminal number 85.

WARNING: DO NOT ALLOW OHMMETER TO CONTACT TERMINALS 85 OR 86 DURING THIS TEST. DAMAGE TO OHMMETER MAY RESULT.

(7) Attach the other end of the jumper wire to relay terminal 86. This activates the relay. The ohmmeter should now show continuity between relay terminals 87 and 30. The ohmmeter should not show continuity between relay terminals 87A and 30.

(8) Disconnect jumper wires.

(9) Replace the relay if it did not pass the continuity and resistance tests. If the relay passed the tests, it operates properly. Check the remainder of the ASD and fuel pump relay circuits. Refer to 8, Wiring Diagrams.

REMOVAL

The ASD relay is located in the Power Distribution Center (PDC) (Fig. 5). Refer to label on PDC cover for relay location.

(1) Remove PDC cover.

(2) Remove relay from PDC.

8I - 8 IGNITION CONTROL DR

AUTOMATIC SHUT DOWN RELAY (Continued)

(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.

Fig. 5 PDC LOCATION

1 - BATTERY 2 - PDC (POWER DISTRIBUTION CENTER)

INSTALLATION

The ASD relay is located in the Power Distribution Center (PDC) (Fig. 5). Refer to label on PDC cover for relay location.

(1) Install relay to PDC.

(2) Install cover to PDC.

CAMSHAFT POSITION SENSOR

DESCRIPTION

5.7L V-8

The Camshaft Position Sensor (CMP) on the 5.7L V-8 engine is located below the generator on the timing chain / case cover on the right/front side of engine.

5.9L Diesel

The Camshaft Position Sensor (CMP) on the 5.9L diesel engine is located below the fuel injection pump. It is bolted to the back of the timing gear cover.

5.9L V-8 Gas

The Camshaft Position Sensor (CMP) on the 5.9L V-8 engine is located inside the distributor.

8.0L V–10

The Camshaft Position Sensor (CMP) on the 8.0L V-10 engine is located on the timing chain / case cover on the left/front side of engine.

OPERATION

3.7L V-6

The Camshaft Position Sensor (CMP) sensor on the

3.7L V-6 engine contains a hall effect device referred to as a sync signal generator. A rotating target wheel (tonewheel) for the CMP is located at the front of the camshaft for the right cylinder head (Fig. 6). This sync signal generator detects notches 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 then tip of the CMP, the change of the magnetic field causes the sync signal voltage to switch low to 0 volts.

3.7L V-6

The Camshaft Position Sensor (CMP) on the 3.7L 6-cylinder engine is bolted to the right-front side of the right cylinder head.

4.7L V-8

The Camshaft Position Sensor (CMP) on the 4.7L V-8 engine is bolted to the right-front side of the right cylinder head.

4.7L V-8

The CMP sensor on the 4.7L 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 is located at the front of the camshaft for the right cylinder head (Fig. 7). As the tonewheel rotates, the notches 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,

DR IGNITION CONTROL 8I - 9

CAMSHAFT POSITION SENSOR (Continued)

Fig. 6 CMP OPERATION- 3.7L V-6

1 - NOTCHES 2 - RIGHT CYLINDER HEAD 3 - CMP 4 - TONEWHEEL (TARGET WHEEL)

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.

Fig. 7 CMP AND TONEWHEEL OPERATION - 4.7L

V-8

1 - NOTCHES 2 - RIGHT CYLINDER HEAD 3 - CAMSHAFT POSITION SENSOR 4 - TONEWHEEL

5.7L V-8

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 (Fig. 8). As the tonewheel rotates, notches (Fig.

8) 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.

Fig. 8 CMP OPERATION - 5.7L ENGINE

1 - TIMING CHAIN COVER 2 - TONEWHEEL 3 - NOTCHES

8I - 10 IGNITION CONTROL DR

CAMSHAFT POSITION SENSOR (Continued)

5.9L V-8 Gas

The CMP sensor on the 5.9L V-8 engine contains a hall effect device called a sync signal generator to generate a fuel sync signal. This sync signal generator detects a rotating pulse ring (shutter) (Fig. 9) on the distributor shaft. The pulse ring rotates 180 degrees through the sync signal generator. Its signal is used in conjunction with the Crankshaft Position (CKP) sensor 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 pulse ring (shutter) enters the sync signal generator, the following occurs: 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 pulse ring (shutter) leaves the sync signal generator, the following occurs: The change of the magnetic field causes the sync signal voltage to switch low to 0 volts.

change of the magnetic field causes the signal voltage to switch low to 0 volts.

The CMP (Fig. 10) provides a signal to the Engine Control Module (ECM) at all times when the engine is running. The ECM uses the CMP information primarily on engine start-up. Once the engine is running, the ECM uses the CMP as a backup sensor for engine speed. The Crankshaft Position Sensor (CKP) is the primary engine speed indicator for the engine after the engine is running.

Fig. 9 CMP / PULSE RING - 5.9L GAS ENGINE

1 - SYNC SIGNAL GENERATOR 2 - CAMSHAFT POSITION SENSOR 3 - PULSE RING 4 - DISTRIBUTOR ASSEMBLY

5.9L Diesel

The Camshaft Position Sensor (CMP) contains a hall effect device. A rotating target wheel (tonewheel) for the CMP is located on the front timing gear. This hall effect device detects notches located on the tonewheel. As the tonewheel rotates, the notches pass the tip of the CMP.

When the leading edge of the tonewheel notch passes the tip of the CMP, the following occurs: The interruption of magnetic field causes the voltage to switch high resulting in a signal of approximately 5 volts.

When the trailing edge of the tonewheel notch passes the tip of the CMP, the following occurs: The

Fig. 10 5.9L DIESEL CMP

1 - CMP 2 - FUEL INJECTION PUMP (BOTTOM) 3 - ELECTRONIC CONTROL MODULE (ECM) 4 - ECM ELEC. CONNECTOR 5 - CMP ELEC. CONNECTOR 6 - CMP MOUNTING BOLT 7 - BACK OF TIMING GEAR COVER

8.0L V-10

A low and high area are machined into the camshaft drive gear (Fig. 11). The sensor is positioned in the timing gear cover so that a small air gap (Fig. 11) exists between the face of sensor and the high machined area of cam gear.

DR IGNITION CONTROL 8I - 11

CAMSHAFT POSITION SENSOR (Continued)

When the cam gear is rotating, the sensor will detect the machined low area. 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 the high machined area, the input voltage switches back low to approximately 0.3 volts.

Fig. 12 CMP LOCATION - 3.7L

1 - RIGHT/FRONT OF RIGHT CYLINDER HEAD 2 - CMP MOUNTING BOLT 3 - CMP LOCATION

Fig. 11 CMP SENSOR OPERATION – 8.0L V-10

ENGINE

1 - CAM DRIVE GEAR 2 - LOW MACHINED AREA 3 - HIGH MACHINED AREA 4 - CAMSHAFT POSITION SENSOR 5 - AIR GAP

REMOVAL

3.7L V-6

The Camshaft Position Sensor (CMP) on the 3.7L V-6 engine is bolted to the front/top of the right cylinder head (Fig. 12).

(1) Disconnect electrical connector at CMP sensor.

(2) Remove sensor mounting bolt (Fig. 12).

(3) Carefully twist sensor from cylinder head.

(4) Check condition of sensor o-ring.

4.7L V-8

The Camshaft Position Sensor (CMP) on the 4.7L V–8 engine is bolted to the front/top of the right cylinder head (Fig. 13).

(1) Raise and support vehicle.

(2) Disconnect electrical connector at CMP sensor (Fig. 13).

Fig. 13 CMP LOCATION - 4.7L

1 - RIGHT CYLINDER HEAD 2 - CAMSHAFT POSITION SENSOR 3 - MOUNTING BOLT 4 - ELEC. CONNECTOR

(3) Remove sensor mounting bolt (Fig. 13). (4) Carefully twist sensor from cylinder head. (5) Check condition of sensor o-ring.

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