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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.

 

 

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