Ignition Coil Resistance - 3.7L; Ignition Coil Resistance - 4.7L V-8; Ignition Coil Resistance - 5.7L V-8; Ignition Coil Resistance - 5.9L - Dodge dakota 2002 Service Manual

8I - 6 IGNITION CONTROL
IGNITION CONTROL (Continued)
IGNITION COIL RESISTANCE - 3.7L V-6
PRIMARY RESISTANCE
21-27°C (70-80°F)
0.6 - 0.9 Ohms

IGNITION COIL RESISTANCE - 4.7L V-8

PRIMARY
RESISTANCE 21-27°C
(70-80°F)
0.6 - 0.9 Ohms

IGNITION COIL RESISTANCE - 5.9L

COIL MANUFACTURER
Diamond
Toyodenso
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

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.
SECONDARY
RESISTANCE 21-27°C
(70-80°F)
6,000 - 9,000 Ohms
SECONDARY
RESISTANCE 21-27°C
(70-80°F)
6,000 - 9,000 Ohms
PRIMARY RESISTANCE
21-27°C (70-80°F)
0.97 - 1.18 Ohms
0.95 - 1.20 Ohms

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
11,300 - 15,300 Ohms
11,300 - 13,300 Ohms
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 switch-
ing 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-ac-
tivated by the PCM if:
• the ignition key is left in the ON position. This
is if the engine has not been running for approxi-
mately 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).
(70-80°F)
DR