1995 JEEP XJ Service And Repair Manual

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Page 1441 of 2158

JEEP XJ 1995 Service And Repair Manual (18) Inspect engine ground strap connections at
dash panel and rear cylinder head bolt (Fig. 20). For
ground locations, refer to Group 8, Wiring.
(19) Verify that MAP sensor electrical connector is
fi

Page 1442 of 2158

JEEP XJ 1995 Service And Repair Manual plugged catalytic convertor.
(27) If equipped with automatic transmission, ver-
ify that electrical harness is firmly connected to park/
neutral safety switch. Refer to Automatic
Transmission section

Page 1443 of 2158

JEEP XJ 1995 Service And Repair Manual PCM SYSTEM SCHEMATICS
Powertrain control system schematics for the 2.5L
4-cylinder and 4.0L 6-cylinder engines are shown in
figures 29, 30, 31 and 32.
These schematics are displayed as a quick refer-

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JEEP XJ 1995 Service And Repair Manual Fig. 29 System SchematicÐYJ Models with 2.5L Engine
14 - 42 FUEL SYSTEM GENERAL DIAGNOSISJ

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JEEP XJ 1995 Service And Repair Manual Fig. 30 System SchematicÐYJ Models with 4.0L Engine
JFUEL SYSTEM GENERAL DIAGNOSIS 14 - 43

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JEEP XJ 1995 Service And Repair Manual Fig. 31 System SchematicÐXJ Models with 2.5L Engine
14 - 44 FUEL SYSTEM GENERAL DIAGNOSISJ

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JEEP XJ 1995 Service And Repair Manual Fig. 32 System SchematicÐXJ Models with 4.0L Engine
JFUEL SYSTEM GENERAL DIAGNOSIS 14 - 45

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JEEP XJ 1995 Service And Repair Manual AUTOMATIC SHUTDOWN (ASD) RELAY TESTING
To perform a complete test of the ASD relay and its
circuitry, refer to the DRB scan tool and appropriate
Powertrain Diagnostics Procedures manual. To test
the r

AUTOMATIC SHUTDOWN (ASD) RELAY TESTING
To perform a complete test of the ASD relay and its
circuitry, refer to the DRB scan tool and appropriate
Powertrain Diagnostics Procedures manual. To test
the relay only, refer to RelaysÐOperation/Testing in
this section of the group.
CAMSHAFT POSITION SENSOR TEST
Refer to Group 8D, Ignition Systems, for Camshaft
Position Sensor testing.
ENGINE COOLANT TEMPERATURE SENSOR TEST
To perform a complete test of the engine coolant
temperature sensor and its circuitry, refer to DRB
scan tool and appropriate Powertrain Diagnostics
Procedures manual. To test the sensor only, refer to
the following:
Disconnect wire harness connector from engine
coolant temperature sensor (Fig. 33).
Test the resistance of the sensor with a high input
impedance (digital) volt-ohmmeter. The resistance
should be less than 1000 ohms with the engine at its
correct operating temperature. Refer to the Coolant
Temperature Sensor/Manifold Air Temperature Sen-
sor resistance chart. Replace the sensor if it is not
within the range of resistance specified in the chart.
Test continuity of the wire harness. Do this be-
tween the Powertrain Control Module (PCM) wire
harness connector terminal-2 and the sensor connec-
tor terminal. Also test continuity of wire harness ter-
minal-4 to the sensor connector terminal. Repair the
wire harness if an open circuit is indicated.
INTAKE MANIFOLD AIR TEMPERATURE SENSOR
TEST
To perform a complete test of the sensor and its cir-
cuitry, refer to DRB scan tool and appropriate Pow-ertrain Diagnostics Procedures manual. To test the
sensor only, refer to the following:
Disconnect the wire harness connector from the in-
take manifold air temperature sensor (Figs. 34 or
35).
Test the resistance of the sensor with an input im-
pedance (digital) volt-ohmmeter. The resistance
should be less than 4000 ohms with the engine at op-
erating temperature. The longer the engine idles, the
warmer the intake manifold temperature will be-
come. Refer to the Coolant Temperature Sensor/Man-
ifold Air Temperature Sensor resistance chart.
Replace the sensor if it is not within the range of re-
sistance specified in the chart.
Fig. 33 Engine Coolant Temperature SensorÐ
Typical
SENSOR RESISTANCE (OHMS)ÐCOOLANT
TEMPERATURE SENSOR/MANIFOLD AIR
TEMPERATURE
Fig. 34 Air Temperature SensorÐ2.5L Engine
14 - 46 FUEL SYSTEM GENERAL DIAGNOSISJ

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