Chrysler neon 1997 Service Manual page 1337

PURGE SPECIAL TOOL #6457 NIP- PLE
14 - 50 FUEL SYSTEM
DIAGNOSIS AND TESTING (Continued)
(4) Use a piece of hose to attach Air Metering Ori-
fice 6457 (0.125 in. orifice) to the purge nipple on the
throttle body (Fig. 84).
Fig. 84 Orifice 6457 Attached to Purge Nipple
(5) Ensure that all accessories are off.
(6) Connect the DRB scan tool to the data link
connector inside the passenger compartment.
(7) Run engine in Park or Neutral until the cooling
fan has cycled on and off at least once (180°F).
(8) Using the DRB scan tool, access Minimum Air-
flow Idle Speed.
(9) The following will then occur:
• Idle air control motor will fully close
• Idle spark advance will become fixed
• PCM will go open loop enriched
• DRB scan tool displays engine RPM
(10) If idle RPM is within the range shown in the
Idle Specification chart, throttle body minimum air-
flow is set correctly.
IDLE SPECIFICATION —2.0L ENGINE
Odometer Reading
Below 1000 Miles . . . . . . . . . . . . . . . 550–1300 RPM
Above 1000 Miles . . . . . . . . . . . . . . . 600–1300 Miles
(11) If idle RPM is above specifications, use the
DRB scan tool to check idle air control motor opera-
tion. If idle air control motor is OK, replace throttle
body. If idle air flow is below specification, shut off
the engine and clean the throttle body as follows:
WARNING: CLEAN THROTTLE BODY IN A WELL
VENTILATED AREA. WEAR RUBBER OR BUTYL
GLOVES, DO NOT LET MOPAR PARTS CLEANER
COME IN CONTACT WITH EYES OR SKIN. AVOID
INGESTING THE CLEANER. WASH THOROUGHLY
AFTER USING CLEANER.
(a) Remove the throttle body from engine.
(b) While holding the throttle open, spray the
entire throttle body bore and the manifold side of
the throttle plate with Mopar Parts Cleaner. Only
use Mopar Parts Cleaner to clean the throttle
body.
(c) Using a soft scuff pad, clean the top and bot-
tom of throttle body bore and the edges and mani-
fold side of the throttle blade. The edges of the
throttle blade and portions of the throttle
bore that are closest to the throttle blade
when closed, must be free of deposits.
(d) Use compressed air to dry the throttle body.
(e) Inspect throttle body for foreign material.
(f) Install throttle body on manifold.
(g) Repeat steps 1 through 14. If the minimum
air flow is still not within specifications, the prob-
lem is not caused by the throttle body.
(12) Shut off engine.
(13) Remove Air Metering Orifice 6457. Install
purge hose.
(14) Remove cap from PCV valve. Connect hose to
PCV valve.
(15) Remove DRB scan tool.
VEHICLE SPEED SENSOR
To perform a complete test of the sensor and its
circuitry, refer to the DRB scan tool and appropriate
Powertrain Diagnostics Procedures Manual.
REMOVAL AND INSTALLATION
THROTTLE BODY—MANUAL TRANSMISSION
Remove throttle body cables using the following
procedures.
REMOVAL
(1) Remove throttle cable cover.
(2) Remove throttle cable from the throttle body
Idle RPM
cam (Fig. 85) and (Fig. 86).
Fig. 85 Throttle Cable Attachment to Throttle Body
SPEED THROTTLE LEVER CONTROL CABLE
PL
THROTTLE CABLE