COLD IDLE SPEED ADJUSTMENT FOR ALL MAGNETTI-MARELLI
NOTE
All sensors and actuators must be in proper working order
and the engine must be in good condition in order for this
procedure to have correct and consistent results.
1. Remove right side saddlebag. See SADDLEBAG,
REMOVAL, in the appropriate FLT Models Service
Manual.
2. Gently pull side cover from frame downtubes (no tools
required).
3. Remove rubber plug from open end of Data Link connector
and plug in Scanalyzer (HD-41325).
4. With the Engine Stop/Run Switch in the RUN position,
turn the Ignition Light/Key Switch to ON.
5. While observing TP voltage under the Data Monitor
Menu of the Scanalyzer, turn the Ignition Light/Key
Switch back to the OFF position. Note that the TP voltage
drops, increases and then stops just before electrical
power is interrupted. If the Scanalyzer display stops within the voltage range
listed in Table 1, then the cold idle speed does not need
to be adjusted. Proceed directly to WARM-SLOW IDLE
SPEED ADJUSTMENT on page 2.
6. If the TP voltage is out of range, proceed as follows:
a. Remove air cleaner and backplate assembly. See
AIR CLEANER, REMOVAL, in the appropriate FLT
Models Service Manual.
b. With the Engine Stop/Run Switch in the RUN position,
turn the Ignition Light/Key Switch to ON and
then back to the OFF position. The idle speed control
actuator retracts, and then moves out to the
parked position.
c. Unplug the wire harness connector from the idle
speed control actuator. See Figure 1.
d. With the Engine Stop/Run Switch in the RUN position,
turn the Ignition Light/Key Switch to ON.
e. While observing TP voltage under the Data Monitor
Menu of the Scanalyzer (or Breakout Box and
DVOM), use a T10 TORX drive head to adjust the
cold idle speed set screw until reading is within the
voltage range listed in Table 1. Be sure not to move
the idle speed lever while turning the screw.
NOTE
Gently open the throttle to better access the cold idle speed
set screw. After making the adjustment, gently roll the throttle
closed and recheck the TP voltage reading.
DO NOT allow throttle to "snap shut" or the idle speed control actuator
may move (resulting in an unwanted voltage change that
requires the adjustment procedure be restarted).
SETTINGS FOR EFI EQUIPPED VEHICLES WITH "STOCK" ECM CALIBRATIONS
1340 Domestic/HDI 0.61 to 0.64
1450 Domestic/HDI 0.64 to 0.68
WARM-SLOW IDLE SPEED ADJUSTMENT FOR ALL MAGNETTI-MARELLI
NOTE
For proper adjustment, always check/set cold idle speed
adjustment before proceeding. See COLD IDLE SPEED
ADJUSTMENT on page 1.
1. If cold idle speed was adjusted, install air cleaner backplate.
See AIR CLEANER, INSTALLATION, in the
appropriate FLT Models Service Manual.
If cold idle speed adjustment was not necessary,
remove air cleaner cover and filter. See AIR CLEANER,
REMOVAL, in the appropriate FLT Models Service
Manual.
2. Start vehicle and run until both engine and primary oil
reach operating temperature (fully warm). Using the
Scanalyzer, verify that engine temperature is at or
above the temperatures listed in Table 2. This step is
very important or adjustment will be incorrect.
CAUTION
To ensure proper charging at idle, maintain an idle
speed of approximately 950-1050 RPM. Insufficient idle
speed may drain the battery in excessive idle situations,
resulting in insufficient voltage to the ECM, ignition coil
and fuel pump (which can result in a variety of operating
problems).
3. To adjust the warm-slow idle speed, locate the set screw
through the hole in the air cleaner backplate (lower right
corner of the intake air inlet). See Figure 2.
NOTE
For best results, use the Scanalyzer (HD-41325) or an external
tachometer with an inductive pickup.
4. Using a T10 TORX drive head, set idle speed at 950-
1050 RPM. Turn the set screw clockwise to increase OR
counter-clockwise to decrease idle speed.
5. When idle speed is set, turn the Ignition/Light Key
Switch to OFF.
6. Complete air cleaner installation. See AIR CLEANER,
INSTALLATION, in the appropriate FLT Models Service
Manual.
NOTE
Installation of air cleaner cover may affect idle speed.
7. Verify correct idle speed after assembling air cleaner.
Repeat adjustment procedure if necessary.
Following the final idle speed adjustment, remove both
5 amp and 15 amp fuses (ECM power and fuel pump)
for at least one minute. See FUSES, REMOVAL, in the
appropriate FLT Models Service Manual. This step is
necessary to clear the ECM memory of the previously
learned minimum throttle position.
8. Reinstall both 5 amp and 15 amp fuses. See FUSES,
INSTALLATION, in the appropriate FLT Models Service
Manual.
9. With the Engine Stop/Run Switch in the RUN position,
turn the Ignition Light/Key Switch to ON, and wait until
the CHECK ENGINE LAMP goes out.
10. Turn the Ignition Light/Key Switch to OFF and wait
approximately 10 seconds for the ECM relay to
disconnect. The idle speed control actuator stops in the
extended position, and the Scanalyzer screen displays
"No Response."
11. Start engine and run until both engine and primary oil
are fully warm. Verify that engine temperature is at or
above the temperatures listed in Table 2. Check that hot
idle speed is 950-1050 RPM.
12. Turn the Ignition/Light key Switch to OFF. Unplug the
Scanalyzer and install rubber plug into open end of Data
Link Connector.
