Jeep 1996 Grand Cherokee Service Manual - page 1092
(3) Test powertrain control module (PCM) cavity
A-27 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. 46) with the
ignition ON. The voltage should be approximately 5
volts (
60.5V). Five volts (60.5V) should also be at
cavity A-17 of the PCM wire harness connector.
Repair or replace the wire harness as necessary.
(5) Test the MAP sensor ground circuit at sensor
connector terminal—A (Fig. 46) and PCM connector
A-4. Repair the wire harness if necessary.
Refer to Group 8W, Wiring Diagrams for cavity
locations.
MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR
TEST—4.0L ENGINE
To perform a complete test of MAP sensor (Fig. 47)
and its circuitry, refer to DRB scan tool and appro-
priate Powertrain Diagnostics Procedures manual. To
test the MAP sensor only, refer to the following:
(1)
Inspect the rubber L-shaped fitting from the
MAP sensor to the throttle body (Fig. 48). Repair as
necessary.
CAUTION:
When testing the MAP sensor, be sure
that the harness wires are not damaged by the test
meter probes.
(2) Test the MAP sensor output voltage at the
MAP sensor connector between terminals A and B
(Fig. 49). With the ignition switch ON and the engine
OFF, output voltage should be 4-to-5 volts. The volt-
age should drop to 1.5-to-2.1 volts with a hot, neutral
idle speed condition.
Fig. 44 MAP Sensor—5.2L Engine—Typical
Fig. 45 Rubber L-Shaped Fitting—MAP Sensor-to-
Throttle Body
Fig. 46 MAP Sensor Connector Terminals—Typical
Fig. 47 Sensor Location—4.0L Engine
ZJ
FUEL SYSTEM
14 - 47
DIAGNOSIS AND TESTING (Continued)