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Chrysler Pacifica. Manual - part 739

3.8L - UPPER O2 SENSOR

The engines uses two heated oxygen sensors.

CAUTION: When disconnecting the sensor electrical
connector, do not pull directly on wire going into
sensor.

(1) Disconnect negative battery cable.
(2) Disconnect the upper O2 sensor connector (Fig.

64).

(3) Use a socket such as Snap-On YA8875 or a

crow foot wrench to remove oxygen sensor (Fig. 65).

3.8L - LOWER O2 SENSOR

The engines uses two heated oxygen sensors.

CAUTION: When disconnecting the sensor electrical
connector, do not pull directly on wire going into
sensor.

(1) Disconnect negative battery cable.
(2) Raise and support vehicle.
(3) Disconnect the electrical connector.
(4) Use a socket such as Snap-On YA8875 or a

crow foot wrench to remove oxygen sensor (Fig. 66).

INSTALLATION

3.5L

NOTE: When replacing an O2 Sensor, the PCM RAM
memory must be cleared, either by disconnecting
the PCM C-1 connector or momentarily disconnect-
ing the Battery negative terminal. The NGC learns
the characteristics of each O2 heater element and
these old values should be cleared when installing
a new O2 sensor. The customer may experience
driveability issues if this is not performed.

(1) After removing the sensor, the threads must be

cleaned with an 18 mm X 1.5 + 6E tap. If reusing the
original sensor, coat the sensor threads with an anti-
seize compound such as Loctite 771- 64 or equivalent.
New sensors have compound on the threads and do
not require an additional coating. Tighten the sensor
to 28 N·m (20 ft. lbs.) torque.

(2) Connect the heated oxygen sensor electrical

connector.

Fig. 64 O2 SENSOR CONNECTOR

Fig. 65 UPSTREAM O2 SENSOR

1 - Item_1xftjhxfdj
2 - Item _2tjsryjy

Fig. 66 LOWER O2 LOCATION

FUEL INJECTION

14 - 47

O2 SENSOR (Continued)

(3) Install the wiring clip to the heat shield (Fig.

67).

(4) Connect the negative battery cable.

3.8L - O2 SENSOR UPPER

(1) After removing the sensor, the threads must be

(2) Connect the heated oxygen sensor electrical

connector (Fig. 69).

(3) Connect the negative battery cable.

WIRE CLIP LOOSE

Fig. 67 WIRE CLIP IN PLACE

Fig. 68 UPSTREAM O2 SENSOR

1 - Item_1xftjhxfdj
2 - Item _2tjsryjy

Fig. 69 O2 SENSOR CONNECTOR

14 - 48

FUEL INJECTION

O2 SENSOR (Continued)

3.8L - O2 SENSOR LOWER

(1) After removing the sensor, the threads must be

(2) Connect the heated oxygen sensor electrical

connector (Fig. 70).

(3) Lower vehicle.
(4) Connect the negative battery cable.

THROTTLE BODY

REMOVAL

3.5L

(1) Disconnect negative cable from battery
(2) Remove the engine cover.
(3) Remove the air cleaner box, (Refer to 9 -

ENGINE/AIR

INTAKE

SYSTEM/AIR

CLEANER

HOUSING - REMOVAL).

(4) Hold throttle lever in wide open position.

Remove throttle cable and speed control cables from
throttle arm.

(5) Remove throttle cable bracket (Fig. 71).

(6) Disconnect electrical connectors from throttle

body (Fig. 72).

Fig. 70 LOWER O2 LOCATION

Fig. 71 THROTTLE BODY BRACKET

Fig. 72 THROTTLE BODY, TPS, & IAC

1 - Throttle Body
2 - Throttle Position Sensor
3 - Idle Air Control Motor

FUEL INJECTION

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O2 SENSOR (Continued)

(7) Remove 3 throttle body bolts.

(8) Remove throttle body (Fig. 73).
(9) Clean mating surfaces.

3.8L

(1) Disconnect negative cable from battery
(2) Remove the air cleaner box, (Refer to 9 -

ENGINE/AIR

INTAKE

SYSTEM/AIR

CLEANER

HOUSING - REMOVAL).

(3) Remove throttle and speed control cables (Fig.

74).

(4) Hold throttle lever in wide open position.

Remove throttle cable and speed control cables from
throttle arm (Fig. 75).

(5) Disconnect electrical connectors and purge line

from throttle body (Fig. 76).

Fig. 73 THROTTLE BODY REMOVED

Fig. 74 CABLES AND BRACKET

Fig. 75 CABLE AT THROTTLE BODY

Fig. 76 THROTTLE BODY

1 - Purge Line
2 - Throttle Position Sensor
3 - Idle Air Control Motor

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FUEL INJECTION

THROTTLE BODY (Continued)

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