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1989-1993 GALANT Chassis & Mechanical V1
FUEL SYSTEM <DOHC> Service Adjustment Procedures
13-245


I
SERVICE ADJUSTMENT PROCEDURES
CURB IDLE SPEED INSPECTION
The vehicle should be prepared as follows before the
inspection.
l
Engine coolant temperature:

l
Lights, electric cooling fan and accessories: OFF
l
Transaxle: Neutral for vehicles with an automatic
transaxle)
(2) Connect a tachometer.
NOTE
Refer to
for information concerning connec-
tion of a tachometer.
2. For tachometer, one-half of the actual engine rpm is
indicated, so the actual engine rpm in two times the
indicated value shown by the tachometer. <From 1990
models>
(3) Set a timing light in position.
(4) Ground the terminal for adjustment of ignition timing.
(5) Start the engine and let it idle.
(6) Check whether or not the ignition timing the standard
value; if not, adjust.
Standard value:
2
(7) Stop grounding the terminal for adjustment of ignition
timing.
(8) Let the engine idle for two minutes.
(9) Check the idling rpm.
Curb idle speed:
100 rpm <Non-Turbo>
100 rpm <Turbo>
NOTE
The idling rpm is automatically regulated by the idle air
system.
not within the standard value range, refer to the
CHECK
CHART CLASSIFIED BY PROBLEM SYMPTOMS and
check the
component.
BASIC IDLE SPEED ADJUSTMENT
NOTE
1. The standard idling speed has been adjusted, by the en-
gine speed adjusting screw (RPM adjusting screw), by the
manufacturer, and there should usually be no need for
readjustment.
2. Use the following procedure to adjust when the idling
speed drops due to an incorrect adjustment, high idling
speed, or when a load such as the air conditioning is ap-
plied
on the engine.
3. The adjustment, if made, should be made after first con-
firming that the spark plugs, the injectors, the idle air con-
trol motor, the compression pressure, etc. are all
TSB Revision 13-246
FUEL SYSTEM <DOHC>

Adjustment Procedures

The vehicle should be prepared as follows before the
inspection and adjustment.
l
Engine coolant temperature:

l
Lights, electric cooling fan and accessories: OFF
l
Transaxle: Neutral
(P for vehicles with an automatic transaxle)
Connect the scan tool to the data link connector (white).
NOTE
When the scan tool is connected, the diagnostic test mode
control terminal is grounded.
(3) If the scan tool is not used, follow the steps below.
Insert a paper clip (from the harness side) into the l-pin
connector shown in the figure at the left.
Take care not to disconnect the connector.













Caution
The paper clip should be inserted between the termin-
als as shown in the figure at the left.
Connect a primary-voltage-detection type of
tacho-
meter to the paper clip.
TSB Revision FUEL SYSTEM <DOHC> Service Adjustment Procedures
NOTE
For rpm, one-half of the actual engine rpm is indicated,
so the actual engine rpm in two times the indicated
value shown by the tachometer. <From 1990 models>
Use a jumper wire to ground the diagnostic test mode
control terminal of the data link connector.
(4) Use a jumper wire to ground the terminal for adjustment of
ignition timing.
(5) Start the engine and let it idle.
(6) Check the standard idling rpm.
If the scan tool is used, select item
and read out the
idling rpm.
Basic idle speed:
rpm <Non-Turbo>
50 rpm <Turbo>
NOTE
1. The engine speed may be 20 to 100 rpm lower than
indicated above for a new vehicle [driven approximately
500 km (300 miles) or less], but no adjustment is
necessary.
2.
If the engine stalls or the rpm is low even though the
vehicle has been driven approximately 500 km (300
miles) or more, it is probable that deposits are adhered
to the throttle valve, so clean it. (Refer to
TSB Revision
(7) If not within the standard value range, turn the engine
speed adjusting screw (RPM adjusting screw) to make the
necessary adjustment.
NOTE
If the idling speed is higher than the standard value range
even when the RPM adjusting screw is fully closed, check
whether or not there is any indication that the CTP switch
(fixed SAS) has been moved.
If there is an indication that it has been moved, adjust the
CTP switch (fixed SAS). If there are no indications that it
has been moved, it is possible that there is leakage as a re-
sult of deterioration of the fast idle air valve (FIAV), and, if
so, the throttle body should be replaced. FUEL SYSTEM <DOHC>
Service
Adjustment Procedures
(8) Switch OFF the ignition switch.
(9) If the scan tool was not used, disconnect the jumper wire
from the diagnostic test mode control terminal.
the jumper wire from the terminal for adjust-
ment of ignition timing, and return the connector to its
original condition.
(11
the engine again and let it run at idle speed for about
ten minutes; check to be sure that the idling condition is
normal.
THROTTLE BODY (THROTTLE VALVE AREA)
CLEANING
Start the engine and warm it up until the temperature of the
engine coolant reaches

or higher; then stop
the engine.
(2) Disconnect the air intake hose at the throttle body side.
(3) Plug the bypass passage entrance of the throttle body.
Caution
Be absolutely sure that no cleaning liquid enters the
bypass passage.
(4) Spray cleaning liquid (from the intake port of the throttle
body) onto the valve, and then leave as is for about five
minutes.
(5) Start the engine and race it a few times; then let it run at
idle speed for about one minute.
NOTE
If, because the bypass passage is plugged, the engine
idling speed is unstable (or the engine stalls), let the engine
run with the throttle valve slightly open.
(6) If deposits are not removed from the throttle valve, repeat
steps (4) and (5).
(7) Remove the plug from the bypass passage entrance.
(8) Connect the air intake hose.
(9) Using the scan tool, erase the diagnostic trouble code, or
disconnect the batterys ground cable for ten seconds or
longer and then reconnect it.
the basic idle speed (engine speed adjusting screw).
(Refer to
THROTTLE POSITION SENSOR
(1) Connect the scan tool to the data link connector (white).
TSB Revision FUEL SYSTEM <DOHC> Service Adjustment Procedures
13-249
m o d e l s >


(2) If a scan tool is not used, perform the following operation.
models>
Disconnect the throttle-position sensor connector,
and connect the special tool (test harness) between the
disconnected connectors.
models>
Connect a digital-type voltmeter between the

al (red clip, sensor ground) and the
terminal (blue clip,
sensor output) of the throttle-position sensor
tor.

<From 1990 models>
Disconnect the
sensor connector and
use the special tool (test harness set) between the
disconnected connector.
Connect a digital type voltmeter between terminal
(sensor output) of the throttle position sensor and
terminal
(sensor ground).
(3) Switch ON the ignition switch.
(Do not start the engine.)
(4) Check the throttle-position sensors output voltage.
When a scan tool is used, select Item
to read the
throttle position sensor output voltage.
Standard value:
V.
TSB Revision FUEL SYSTEM <DOHC> Service Adjustment Procedures






T V = = = - -
(5) If there is a deviation from the standard value, loosen the
throttle-position sensor installation bolt and then turn the
throttle-position sensor itself to make the adjustment after
the throttle body was removed. Be sure to securely
retighten the bolt after making the adjustment.
NOTE




The output voltage becomes higher when the
position sensor is turned clockwise.
For removal and installation of throttle body, refer to
Engine Service Manual.

I



<From 1990 models>
I




Closed throttle
position switch
connector

(6) Switch OFF the ignition switch.
(7) If the diagnostic trouble code is output while adjusting the
throttle position sensor, use a scan tool to erase the diag-
nostic trouble code, or disconnect the battery cable from
the negative terminal of the battery for more than
sec-
onds and then reconnect the cable. (This will cancel the
memory of the failure code due to throttle position sensor
adjustment.)
CLOSED THROTTLE POSITION SWITCH (FIXED
SAS) ADJUSTMENT
NOTE
1. The closed throttle position switch has been precisely ad-
justed by the manufacturer; it should not, therefore, be
moved to another setting.
2. If however, the adjustment is for any reason accidentally
disturbed, or the closed throttle position switch is replaced,
make the necessary readjustment by following the
steps
(1)
relax the tension of the accelerato