ENGINE COMPRESSION
Ensure battery is fully charged. Warm engine to normal operating temperature. Disconnect wire at ignition coil to prevent engine from starting. Check engine compression with all spark plugs removed and throttle wide open.
| Application | Specification |
|---|
| Normal Compression Pressure |
| Caravan, Town & Country, & Voyager | (1) |
| Dakota |
| 2.5L | 120-150 psi (827.4-1034.3 kPa) |
| 3.9L, 4.7L & 5.9L | (1) |
| Durango | (1) |
| Ram Pickup, Ram Van & Ram Wagon | (1) |
| Minimum Compression Pressure |
| Caravan, Town & Country, & Voyager | 100 psi (689.5 kPa) |
| Dakota |
| 2.5L & 4.7L | (1) |
| 3.9L & 5.9L | 100 psi (689.5 kPa) |
| Durango |
| 4.7L | (1) |
| 5.9L | 100 psi (689.5 kPa) |
| Ram Pickup |
| 5.9L (Gasoline) | 100 psi (689.5 kPa) |
| 3.7L, 4.7L, 5.9L Diesel & 8.0L | (1) |
| Ram Van & Ram Wagon | 100 psi (689.5 kPa |
| Maximum Variation Between Cylinders |
| Caravan, Town & Country, & Voyager | 25 Percent |
| Dakota |
| 2.5L | 30 psi (206.9 kPa) |
| 3.9L, 4.7L & 5.9L | (1) |
| Durango | (1) |
| Ram Pickup, Ram Van & Ram Wagon | (1) |
| (1) Information is not available from manufacturer. |
| (1) | Information is not available from manufacturer. |
COMPRESSION SPECIFICATIONS
Gasoline Models
All engines are equipped with hydraulic lifters. No adjustments are required.
5.9L Diesel (Ram Pickup)
Valve adjustment is recommended every 150 months or 150,000 miles during normal service, every 135,000 miles during severe service. Severe service is described as frequent short trip operation of less than 5 miles, long periods of engine idling, trailer towing, police, taxi, local delivery service, or operating in dusty or excessively hot conditions. See VALVE CLEARANCE SPECIFICATIONS (DIESEL) table. For adjustment procedure, see ON-VEHICLE ADJUSTMENTS - TRUCKS - DIESEL article.
| Application | In. (mm) |
|---|
| Intake Valve | .006-.015 (.15-.38) |
| Exhaust Valve | .015-.030 (.38-.76) |
| (1) Adjust valves with engine temperature less than 140°F (60°C). |
| (1) | Adjust valves with engine temperature less than 140°F (60°C). |
VALVE CLEARANCE SPECIFICATIONS (DIESEL) (1)
IGNITION COIL
| Application | Primary | Secondary |
|---|
| Caravan, Town & Country, & Voyager | (1) | (1) |
| Dakota & Durango |
| 2.5L, 3.9L & 5.9L |
| Diamond | .97-1.18 | 11,300-15,300 |
| Toyodenso | .95-1.20 | 11,300-13,300 |
| 4.7L | .60-.90 | 6000-9000 |
| Ram Pickup |
| 3.7L & 4.7L | .60-.90 | 6000-9000 |
| 5.9L |
| Diamond | .97-1.18 | 11,300-15,300 |
| Toyodenso | .95-1.20 | 11,300-13,300 |
| 8.0L | .53-.65 | 10,900-14,700 |
| Ram Van & Ram Wagon |
| Diamond | .97-1.18 | 11,300-15,300 |
| Toyodenso | .95-1.20 | 11,300-13,300 |
| (1) Information is not available from manufacturer. |
| (1) | Information is not available from manufacturer. |
IGNITION COIL RESISTANCE - Ohms @ 70-80°F (21-27°C)
HIGH TENSION WIRE RESISTANCE
| Application | Ohms |
|---|
| Caravan, Town & Country, & Voyager |
| 2.4L | 10,800 Maximum |
| 3.3L & 3.8L (1) |
| Cylinder No. 1 | 22,500 Maximum |
| Cylinder No. 2 | 22,800 Maximum |
| Cylinder No. 3 | 19,300 Maximum |
| Cylinder No. 4 | 19,300 Maximum |
| Cylinder No. 5 | 13,600 Maximum |
| Cylinder No. 6 | 16,400 Maximum |
| Dakota & Durango |
| All High Tension Wires | (2) |
| Ram Pickup, Ram Van & Ram Wagon |
| All High Tension Wires | (2) |
| (1) Maximum wire resistance is listed according to high tension wire application. For cylinder identification, see FIRING ORDER & TIMING MARKS. (2) Resistance should be 250-1000 ohms per one inch or 3000-12,000 ohms per foot. |
| (1) | Maximum wire resistance is listed according to high tension wire application. For cylinder identification, see FIRING ORDER & TIMING MARKS. |
| (2) | Resistance should be 250-1000 ohms per one inch or 3000-12,000 ohms per foot. |
HIGH TENSION WIRE RESISTANCE
SPARK PLUGS
| Application | Spark Plug Type |
|---|
| Caravan, Town & Country, & Voyager |
| 2.4L | Champion RE14MCC5 |
| 3.3L & 3.8L | Champion RE14PLP5 |
| Dakota |
| 2.5L | Champion RC12ECC |
| 3.9L & 5.9L | Champion RC12LC4 |
| 4.7L | Champion RC12MCC4 |
| Durango |
| 4.7L | Champion RC12MCC4 |
| 5.9L | Champion RC12LC4 |
| Ram Pickup |
| 3.7L | NGK ZFR6F-11G |
| 4.7L | Champion RC12MCC4 |
| 5.9L | Champion RC12LC4 |
| 8.0L | (2) QC9MC4 |
| Ram Van & Ram Wagon |
| 3.9L, 5.2L & 5.9L | Champion RC12LC4 |
| (1) Check spark plug application on underhood vehicle emission control label. If application differs from application listed, use application on underhood vehicle emission control label. (2) Information on spark plug manufacturer is not available. |
| (1) | Check spark plug application on underhood vehicle emission control label. If application differs from application listed, use application on underhood vehicle emission control label. |
| (2) | Information on spark plug manufacturer is not available. |
| Application | Gap - In. (mm) | Torque - Ft. Lbs. (N.m) |
|---|
| Caravan, Town & Country, & Voyager |
| 2.4L, 3.3L & 3.8L | .048-.053 (1.22-1.35) | 13 (18) |
| Dakota |
| 2.5L | .035 (.89) | 26-30 (35-41) |
| 3.9L & 5.9L | .040 (1.01) | 26-30 (35-41) |
| 4.7L | .040 (1.01) | 20 (27) |
| Durango |
| 4.7L | .040 (1.01) | 20 (27) |
| 5.9L | .040 (1.01) | 26-30 (35-41) |
| Ram Pickup |
| 3.7L | .042 (1.10) | 20 (27) |
| 4.7L | .040 (1.01) | 20 (27) |
| 5.9L | .040 (1.01) | 30 (41) |
| 8.0L | .045 (1.14) | 30 (41) |
| Ram Van & Ram Wagon |
| 3.9L, 5.2L & 5.9L | .040 (1.01) | 26-30 (35-41) |
| (1) Check spark plug gap specification on underhood vehicle emission control label. If specification differs from that listed above, use specification on underhood vehicle emission control label. |
| (1) | Check spark plug gap specification on underhood vehicle emission control label. If specification differs from that listed above, use specification on underhood vehicle emission control label. |
SPARK PLUG SPECIFICATIONS (1)
FIRING ORDER
Scheme 1
Scheme 1: 2.4L 4-Cyl. - Caravan & Voyager
Scheme 2
Scheme 2: 2.5L 4-Cyl. - Dakota
Scheme 3
Scheme 3: 3.3L & 3.8L V6 - Caravan, Town & Country, & Voyager
Scheme 4
Scheme 4: 3.7L V6 Ram Pickup 1500
Scheme 5
Scheme 5: 3.9L V6 - Dakota, Ram Van & Ram Wagon
Scheme 6
Scheme 6: 4.7L V8 - Dakota, Durango & Ram Pickup
Scheme 7
Scheme 7: 5.2L & 5.9L Gasoline V8 - Dakota, Durango, Ram Pickup, Ram Van & Ram Wagon
Scheme 8
Scheme 8: 5.9L Diesel 6-Cyl. - Ram Pickup
Scheme 9
Scheme 9: 8.0L V10 - Ram Pickup
IGNITION TIMING
Note. On all models, ignition timing is nonadjustable and is controlled by Powertrain Control Module (PCM).
FUEL PUMP (GASOLINE)
| Application | Pressure - psi (kPa) | Minimum Volume In 7 Seconds |
|---|
| Caravan, Town & Country, & Voyager | (1) 53.0-63.0 (365.4-434.4) | (2) |
| Dakota & Durango | (3) 44.2-54.2 (304.8-373.7) | .5 Pt. (.25L) |
| Ram Pickup, Ram Van & Ram Wagon | (1) 44.0-54.0 (303.4-372.3) | .5 Pt. (.25L) |
| (1) Manufacturer lists fuel pressure with engine off, ignition on and using scan tool to activate fuel pump. (2) Information is not available from manufacturer. (3) With engine at idle. |
| (1) | Manufacturer lists fuel pressure with engine off, ignition on and using scan tool to activate fuel pump. |
| (2) | Information is not available from manufacturer. |
FUEL TRANSFER PUMP (DIESEL)
Note. For fuel injection pump timing, see ON-VEHICLE ADJUSTMENTS article.
| Application | Pressure - psi (kPa) |
|---|
| 5.9L Diesel Fuel Transfer Pump (1) |
| Engine Cranking | 7 (48.3) |
| Engine Running | Minimum 10 (69.0) |
| (1) Fuel transfer pump is an electric fuel pump located on left side of engine block, above starter motor. |
| (1) | Fuel transfer pump is an electric fuel pump located on left side of engine block, above starter motor. |
FUEL TRANSFER PUMP PERFORMANCE (DIESEL)
Note. For testing of fuel transfer pump, see appropriate BASIC DIAGNOSTIC PROCEDURES article.
INJECTOR PRESSURES (DIESEL)
| Application | Pressure - psi (kPa) |
|---|
| 5.9L Diesel |
| Injector Pop Off Pressure | 4250-4750 (29,303.8-32,751.3) |
| Injector Leak-Down Pressure | 291 (2006.5) Less Than Pop Off Pressure |
INJECTOR PRESSURES (DIESEL)
INJECTOR RESISTANCE
| Application | Ohms @ 68°F (20°C) |
|---|
| Caravan, Town & Country & Voyager | 10-16 |
| Dakota, Durango, Ram Pickup, Ram Van & Ram Wagon | 10.8-13.2 |
IDLE SPEED & MIXTURE
Note. On gasoline engines, idle speed and mixture are controlled by Powertrain Control Module (PCM). Diesel engines are controlled by 2 different modules. Fuel and emissions are controlled by an Engine Control Module (ECM) located on left side of cylinder block. A/C, charging system, cruise control and transmission are controlled by a Powertrain Control Module (PCM) located in right rear of engine compartment. No adjustment is necessary on gasoline or diesel engines.
| Application | RPM |
|---|
| Gasoline & Diesel Models | (1) |
| (1) Idle speed is not adjustable. |
| (1) | Idle speed is not adjustable. |
IDLE SPEED SPECIFICATIONS
THROTTLE BODY MINIMUM AIRFLOW IDLE SPEED
| Application | RPM |
|---|
| Gasoline & Diesel Models | (1) |
| (1) Information is not available from manufacturer. All idle speed functions are controlled by the PCM. |
| (1) | Information is not available from manufacturer. All idle speed functions are controlled by the PCM. |
THROTTLE BODY MINIMUM AIRFLOW IDLE SPEED SPECIFICATIONS
THROTTLE POSITION SENSOR
| Throttle Opening | (1) Volts |
|---|
| Caravan, Town & Country, & Voyager |
| At Idle | About .6 |
| At Full Throttle | 4.5 Or Less |
| Dakota & Durango |
| At Idle | About .26 |
| At Full Throttle | 4.59 |
| Ram Pickup 1500 |
| At Idle | About .26 |
| At Full Throttle | 4.59 |
| Ram Pickup 2500 & 3500 |
| 3.9L, 5.2L, 5.9L (Gasoline) & 8.0L |
| At Idle | About .26 |
| At Full Throttle | 4.59 |
| 5.9L (Diesel) (2) |
| At Idle | (3) |
| At Full Throttle | (3) |
| Ram Van & Ram Wagon |
| CNG |
| At Idle | (3) |
| At Full Throttle | (3) |
| Except CNG |
| At Idle | About .26 |
| At Full Throttle | 4.59 |
| (1) Specification is approximate and may vary slightly due to sensor and throttle body tolerances. (2) The throttle position sensor on diesel models is known as the Accelerator Pedal Position Sensor (APPS). The APPS is calibrated and permanently positioned on a mounting bracket and is not adjustable. (3) Information is not available from manufacturer. |
| (1) | Specification is approximate and may vary slightly due to sensor and throttle body tolerances. |
| (2) | The throttle position sensor on diesel models is known as the Accelerator Pedal Position Sensor (APPS). The APPS is calibrated and permanently positioned on a mounting bracket and is not adjustable. |
| (3) | Information is not available from manufacturer. |
THROTTLE POSITION SENSOR VOLTAGE SPECIFICATIONS
