throttle body for conditions that may cause idle prob-
lems. This procedure should be used only after
normal diagnostic procedures have failed to
produce results that indicate a throttle body
related problem. Be sure to check for proper
operation of the idle air control motor before
performing this test.
A special fixed orifice tool (number 6714) (Fig. 60)
must be used for the following test.
(1) Start the engine and bring to operating tem-
perature. Be sure all accessories are off before per-
forming this test.
(2) Shut off the engine and remove the air duct at
throttle body.
(3) Disconnect the vacuum line at the PCV valve
(Fig. 61).
(4) Install the 0.185 inch orifice tool (number 6714)
into the disconnected vacuum line in place of the
PCV valve (Fig. 61).
(5) Disconnect the idle purge vacuum line from fit-
ting at throttle body. This vacuum line is located on
the front of throttle body next to the MAP sensor
(Fig. 62). Cap the fitting at throttle body after vac-
uum line has been removed.
(6) Connect the DRB scan tool to the 16–way data
link connector. This connector is located under the
instrument panel to the left of the steering column.
Refer to the appropriate Powertrain Diagnostic Pro-
cedures service manual for DRB operation.
(7) Start the engine and allow to warm up.
(8) Using the DRB scan tool, scroll through the
menus as follows: select—Stand Alone DRB III, select
1994–1997 Diagnostics, select—Engine, select—Sys-
tem Test, select—Minimum Air Flow.
(9) The DRB scan tool will count down to stabilize
the idle rpm and display the minimum air flow idle
rpm. The idle rpm should be between 500 and 900
rpm. If the idle speed is outside of these specifica-
tions, replace the throttle body. Refer to Throttle
Body in the Component Removal/Installation section
of this group.
(10) Disconnect the DRB scan tool from the vehi-
cle.
(11) Remove cap from idle purge fitting at throttle
body and install vacuum line.
(12) Remove orifice tool and connect vacuum line
to PCV valve.
(13) Install air duct to throttle body.
REMOVAL AND INSTALLATION
AUTOMATIC SHUTDOWN (ASD) RELAY
The ASD relay is located in the Power Distribution
Center (PDC) (Fig. 63). Refer to label on PDC cover
for relay location.
Fig. 60 Fixed Orifice Tool
SPECIAL TOOL 6714
Fig. 61 Install Orifice Tool
PCV VALVE
VACUUM LINE
ORIFICE TOOL
Fig. 62 Idle Purge Line
FRONT OF ENGINE
THROTTLE BODY
PURGE
VACUUM
LINE
ZG
FUEL SYSTEM
14 - 55
DIAGNOSIS AND TESTING (Continued)
Summary of Contents for 1997 Grand Cherokee
Page 6: ...FASTENER IDENTIFICATION 4 INTRODUCTION ZG GENERAL INFORMATION Continued ...
Page 9: ...METRIC CONVERSION ZG INTRODUCTION 7 GENERAL INFORMATION Continued ...
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Page 286: ...7 12 COOLING SYSTEM ZG DIAGNOSIS AND TESTING Continued ...
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Page 424: ...VIC Reset 8E 22 INSTRUMENT PANEL SYSTEMS ZG SERVICE PROCEDURES Continued ...
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Page 1655: ...Fig 3 Oil Lubrication System ZG 5 2L ENGINE 9 57 DESCRIPTION AND OPERATION Continued ...
Page 1684: ...TORQUE 9 86 5 2L ENGINE ZG SPECIFICATIONS Continued ...
Page 1689: ...Fig 3 Oil Lubrication System ZG 5 9L ENGINE 9 91 DESCRIPTION AND OPERATION Continued ...
Page 1723: ...DIAGNOSIS AND TESTING SERVICE DIAGNOSIS DIESEL PERFORMANCE ZG ENGINE 9 3 ...
Page 1724: ...9 4 ENGINE ZG DIAGNOSIS AND TESTING Continued ...
Page 1725: ...ZG ENGINE 9 5 DIAGNOSIS AND TESTING Continued ...
Page 1726: ...9 6 ENGINE ZG DIAGNOSIS AND TESTING Continued ...
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Page 1729: ...SERVICE DIAGNOSIS DIESEL MECHANICAL ZG ENGINE 9 9 DIAGNOSIS AND TESTING Continued ...
Page 1730: ...9 10 ENGINE ZG DIAGNOSIS AND TESTING Continued ...
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Page 1762: ...SPECIFICATIONS ENGINE SPECIFICATIONS 9 42 ENGINE ZG ...
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Page 2122: ...DIAGNOSIS AND TESTING NV231 DIAGNOSIS 21 8 TRANSMISSION AND TRANSFER CASE ZG ...