Dodge RAM TRUCK 1500 1995 Service Manual page 1142

14 - 80 GENERAL DIAGNOSIS—EXCEPT DIESEL ™ ~ -
3.9L V-6 or 5.2/5.9L V-8 Engines: The MAP sen­
sor is mounted to the throttle body (Fig. 26). It is
connected to the throttle body with an L-shaped rub­
ber fitting and to the PCM electrically.
MAP
SENSOR
\T~r:J9414-47
Fig. 26 MAP Sensor—3.9L V-6 or 5.2/5.9L V-8
Engines—Typical
8.0L V-10 Engine: The MA? sensor is mounted
into the right side of the intake manifold (Fig. 27). It
senses direct manifold vacuum and is connected to
the PCM electrically.
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Fig. 27 MAP Sensor—8.0L V-10 Engine—Typical
(1) 3.9L V-6 or 5.2/5.9L V-8 Engines: Inspect the
rubber fitting from the MAP sensor to the throttle
body (Fig. 28). Repair as necessary.
CAUTION: When testing the MAP sensor, be sure
that the harness wires are not damaged by the test
meter probes.
MAP SENSOR
MOUNTING SCREWS
r f ^ h R U B B E R FITTING
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Fig. 28 Rubber Fitting—MAP Sensor-to-Throttle
Body—Except S.OL V-10 Engine—Typical
(2) 3.9L V-6 or 5.2/5.9L V-8 Engines: Test the MAP
sensor output voltage at the MAP sensor connector
between terminals A and B (Fig. 29). With the igni­
tion switch ON and the engine OFF, output voltage
should be 4-to-5 volts. The voltage should drop to 1.5-
to-2.1 volts with a hot, neutral idle speed condition.
A. Ground
B. Output Voltage
C.5 Volts
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Fig. 29 MAP Sensor Connector Terminals—3.9L V-6
or 5.2/5.9L V-8 Engines
(3) Test powertrain control module (PCM) termi­
nal-1 for the same voltage described above to verify
the wire harness condition. Repair as necessary.
(4) Test MAP sensor supply voltage at sensor con­
nector between terminals A and C (Fig. 29) with the
ignition ON. The voltage should be approximately 5
volts (±0.5V). Five volts (±0.5V) should also be at
terminal-6 of the PCM wire harness connector. Re­
pair or replace the wire harness as necessary.
(5) Test the MAP sensor ground circuit at sensor