Dodge Nitro. Manual - part 787

2007 ENGINE

Ignition Control - Service Information - Nitro 

IGNITION CONTROL - SERVICE INFORMATION 

DESCRIPTION 

IGNITION SYSTEM-3.7L 

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

This 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. 

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, 2 knock and MAP Sensors  

DESCRIPTION 

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

This 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 
4.0L engine. 

One knock sensor is used to help control spark knock. 

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

 

2007 Dodge Nitro R/T 

2007 ENGINE Ignition Control - Service Information - Nitro

  

 

2007 Dodge Nitro R/T 

2007 ENGINE Ignition Control - Service Information - Nitro

  

The ignition system consists of: 

6 Spark Plugs  

6 Separate Ignition Coils  

1 Knock Sensor  

Powertrain Control Module (PCM)  

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

SPECIFICATIONS 

SPARK PLUGS 

IGNITION TIMING 

Ignition timing is not adjustable on any engine. 

TORQUE SPECIFICATIONS 

TORQUE SPECIFICATIONS 

ENGINE

PLUG TYPE

ELECTRODE GAP

3.7L V-6

ZFR6F - 11G (NGK)

1.1mm (0.043 in.)

4.0L V-6

NGK R - ZFR5LP 13G

1.2mm - 1.35mm (0.048 - 0.053 in.)

DESCRIPTION 

N.m 

Ft. Lbs. 

In. Lbs. 

Camshaft Position Sensor 

- 3.7L

12

-

106

Camshaft Position Sensor 

- 4.0L

12

-

106

Crankshaft Position 

Sensor - 3.7L

28

21

205

Crankshaft Position 

Sensor - 4.0L

28

21

205

Ignition Coil Mounting - 

3.7L

8

-

70

Ignition Coil Mounting - 

4.0L

6.7

-

60

* Knock Sensor - 3.7L

20

15 +/- 2

176

* Knock Sensor - 4.0L

10

7

-

Spark Plugs - 3.7L

27

20

-

Spark Plugs - 4.0L

17.5

13

-

Tilt lever bracket

4.5

-

40

Ignition switch mounting 

screws

3

-

26

 

2007 Dodge Nitro R/T 

2007 ENGINE Ignition Control - Service Information - Nitro

  

IGNITION COIL RESISTANCE - 3.7L V-6 

SPECIFICATIONS - ENGINE FIRING ORDER - 3.7L 

1 - 6 - 5 - 4 - 3 - 2 

RELAY-AUTO SHUT DOWN 

REMOVAL 

AUTO SHUTDOWN RELAY 

Fig. 1: Identifying ASD, Totally Integrated Power Module (TIPM) & Left Inner Fender 
Courtesy of CHRYSLER LLC 

The ASD relay is located in the Totally Integrated Power Module (TIPM) (1). The TIPM is located in the 
engine compartment near the left inner fender (2). Refer to label on TIPM cover for relay location. 

1. Remove TIPM cover.  

2. Remove relay from TIPM.  

3. Check condition of relay terminals and TIPM 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 TIPM connector). Repair 

* 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. (20 N.m).

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

 

2007 Dodge Nitro R/T 

2007 ENGINE Ignition Control - Service Information - Nitro

  

if necessary before installing relay.  

INSTALLATION 

AUTO SHUTDOWN RELAY 

Fig. 2: Identifying ASD, Totally Integrated Power Module (TIPM) & Left Inner Fender 
Courtesy of CHRYSLER LLC 

1. Refer to TIPM cover for ASD relay location.  

2. Install relay to TIPM (1).  

3. Install cover to TIPM.  

SENSOR-CAMSHAFT POSITION 

REMOVAL 

CAMSHAFT POSITION SENSOR - 3.7L 

 

2007 Dodge Nitro R/T 

2007 ENGINE Ignition Control - Service Information - Nitro