Dodge ram truck 3500 1996 Service Manual page 1288

14 - 54 FUEL SYSTEM ™ - — - ~
DIAGNOSIS AND TESTING (Continued!
Fig. 67 Engine Coolant Temperature Sensor—8.0L
Engine
take Air Temperature sensor resistance chart.
Replace the sensor i f i t Is not within the range of
resistance specified i n the chart.
(3) Test continuity of the wire harness between the
PCM wire harness connector and the coolant sensor
connector terminals. Refer to Group 8, Wiring for ter­
minal/cavity locations. Repair the wire harness i f an
open circuit Is indicated.
(4) After tests are completed, connect electrical
connector to sensor.
IDLE AIR CONTROL (IAC) M O T O R — 3 J L / 5 J L / 5 J L
ENGINES
To perform a complete test of the IAC motor and
its circuitry, refer to DRB scan tool and appropriate
Powertrain Diagnostics Procedures manual.
IDLE AIR CONTROL (IAC) MOTOR—8.0L ENGINE
To perform a complete test of the IAC motor and
its circuitry, refer to DRB scan tool and appropriate
Powertrain Diagnostics Procedures manual.
INTAKE MANIFOLD AIR TEMPERATURE SENSOR™
3.9L/5.2L/5.9L ENGINES
To perform a complete test of the intake manifold
air temperature sensor and its circuitry, refer to DRB
tester and appropriate Powertrain Diagnostics Proce­
dures manual. To test the sensor only, refer to the
following:
(1) Disconnect the wire harness connector from the
intake manifold air temperature sensor (Fig. 68) or
(Fig. 69).
(2) Test the resistance of the sensor with an input
impedance (digital) volt-ohmmeter. The resistance (as
measured across the sensor terminals) should be less
than 1340 ohms with the engine warm. Refer to the
Coolant Temperature sensor/Intake Air Temperature
Fig. 68 Intake Manifold Air Temperature Sensor—
3.9L V-6 Engines!
Fig. 69 Intake Manifold Air Temperature Sensor—
5.2U5.9L V-8 Engines!
sensor resistance chart. Replace the sensor i f i t is not
within the range of resistance specified in the chart.
(3) Test the resistance of the wire harness. Do this
between the PCM wire harness connector A-15 and
the sensor connector terminal. Also check between
PCM connector A-4 to the sensor connector terminal.
Repair the wire harness as necessary i f the resis­
tance is greater than 1 ohm.
INTAKE MANIFOLD AIR TEMPERATURE SENSOR—
8.0L ENGINE
To perform a complete test of the intake manifold
air temperature sensor and its circuitry, refer to DRB
tester and appropriate Powertrain Diagnostics Proce­
dures manual. To test the sensor only, refer to the
following:
(1) Disconnect the wire harness connector from the
intake manifold air temperature sensor (Fig. 70).