Harley Davidson 2006 Sportster XLH MODELS. Service Manual — page 36
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MISFIRE
4.12
GENERAL
d0273x8x
Misfire at Idle or Under Load
● Battery condition and connections may also cause mis-
fires.
● Fuel system problems may also cause misfires. Refer to
Table 4-5.
DIAGNOSTICS
Diagnostic Notes
Figure 4-22. Spark Tester
The reference numbers below correlate with the circled num-
bers on the Test 4.12 flow chart.
3.
Perform spark plug cable resistance test.
1WARNING
a. Remove spark plug cable from spark plug and igni-
tion coil. For best results, use a needle nose pliers
Any open spark around gasoline or other combustibles
for removal/installation on coil. Gently grasp cable
may result in fire or explosion. Thoroughly wipe up any
as close to terminals as possible.
spilt fuel and dispose of rags in a suitable manner. Inade-
b. Using an ohmmeter, touch probes to terminals on
quate safety precautions could result in death or serious
each end of plug wire.
injury.
c. Compare resistance values to Table 4-13. Replace
1. See 4.8 INTAKE LEAK TEST for instructions on perform-
cables not meeting specifications. Reinstall and
ing an intake leak test.
repeat procedure on other spark plug cable.
2. See Figure 4-22. Use the SPARK TESTER (Part No. HD-
26792) to verify adequate secondary voltage (25,000
Table 4-13. Spark Plug Cables
volts) at the spark plug.
a. Turn Ignition/Light Key Switch to IGNITION.
LOCATION
LENGTH
RESISTANCE
b. Remove spark plug cable from spark plug. Visually
Front
6.5 inch (165 mm)
1,625-3,791
check plug condition.
Rear
20 inch (508 mm)
5,000-11,666
c. Attach cable to SPARK TESTER. Clip tester to cylin-
der head bolt.
d. While cranking engine, watch for spark to jump
4.
This test can also be performed by substituting a known
tester gap on leads.
good coil for one causing the no spark condition. The coil
does not require full installation to be functional. Verify
NOTE
faulty coil by performing resistance test.
Spark will not be present when cranking with both spark
plugs removed. When checking for spark, use SPARK
5.
Use HARNESS CONNECTOR TEST KIT (Part No. HD-
TESTER with both spark plugs installed and one spark plug
41404), gray pin probe and patch cord to the coil connec-
wire connected to spark tester.
tor [83B].
e. Reinstall spark plug cable and repeat procedure on
6.
Inspect for corrosion at battery terminals, main fuse, igni-
other spark plug cable.
tion fuse terminals GY and R/BK, right handlebar switch
controls connector [22], and ignition coil connector [83].
2006 Sportster: Engine Management
4-31
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x0540a4x
Engine
Stop Switch
To TSM/TSSM connector [30] terminal 2 and
GY
diagnostic link connector [91A] terminal 4
[22B]
1
2
3
4
5
6
15 Amp
[22A]
Ignition Fuse
R/BK To Ignition Switch
GY
W/BK
Ignition
Coil
1
2
3
[83A]
[83B]
W/BK
Y/BE
W/BK
BE/O
BK
[10B]
[10A]
Ignition Control Module (ICM)
Figure 4-23. Ignition Circuit Diagram
Table 4-14. Wire Harness Connectors in Figure 4-23.
NO.
DESCRIPTION
TYPE
LOCATION
[10]
Ignition control module
12-place Deutsch
Under seat
[22]
Right handlebar switch controls
6-place Deutsch
Under fuel tank
[83]
Ignition coil
3-place Packard
On coil, under fuel tank
4-32
2006 Sportster: Engine Management
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Test 4.12
MISFIRE AT IDLE OR UNDER LOAD
Is Fuel
Contaminated?
YES
NO
Drain and
Remove air cleaner cover. Start
Flush Tank.
engine. Open throttle quickly.
Refill With
Does slide move up and down
Fresh Fuel.
with throttle opening?
YES
NO
1
Inspect intake manifold for leaks using
Inspect CV carburetor dia-
intake leak test (propane enrichment).
phragm for leaks. Replace
Are any leaks present?
or repair as necessary.
YES
NO
2
Replace intake
Turn ignition switch off.
seals.
Disconnect one spark plug lead at
a time and install spark tester
(HD-26792). See Figure 4-22.
Crank engine to induce spark.
Observe spark tester during test.
Does spark jump gap on both
leads during test?
YES
NO
3
Check for:
Check the resistance of each spark plug
cable that did not fire the spark tester. Also
•
Faulty, worn or cracked spark
check for faulty plug wire connections and
plug(s).
wire boots for carbon tracking.
•
Plug fouling due to engine
Are wires OK?
mechanical fault. See engine
troubleshooting.
•
Faulty or poor connection at plug.
YES
NO
4
7520
Replace coil with known
Replace faulty
good unit.
wire(s).
Does spark jump tester
gap while cranking?
YES
NO
5
Remove test coil. Disconnect neg-
Original ignition
6
ative (-) battery cable. Measure
coil is faulty. Com-
resistance between battery positive
plete installation
and socket 2 (w/bk) of connector
of new coil.
[83b]. Wiggle harness.
Is resistance less than 1.0 ohm
continuously?
Clear DTCs using speedometer self diagnostics. See
YES
NO
4.5 SPEEDOMETER SELF DIAGNOSTICS. Confirm
proper operation with no check engine lamp.
Replace ICM.
Locate source of
Reprogram and
intermittent and
perform password
repair.
learn.
2006 Sportster: Engine Management
4-33
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NOTES
4-34
2006 Sportster: Engine Management
HOME
DTC P0106, P0107, P0108
4.13
GENERAL
10080
MAP Sensor
See Figure 4-24. The manifold absolute pressure sensor
(MAP sensor) is supplied 5 volts from the ignition control
module and sends a signal back to the ignition control mod-
ule. This signal varies in accordance with engine vacuum and
atmospheric barometric pressure. Changes in barometric
pressure are influenced by weather and altitude.
Table 4-15. Code Description
DTC
DESCRIPTION
P0106
MAP sensor rate-of-change error
P0107
MAP sensor failed open/low
P0108
MAP sensor failed high
Figure 4-24. MAP Sensor
DIAGNOSTICS
Diagnostic Notes
Diagnostic Tips
The reference numbers below correlate with the circled num-
bers on the Test 4.13 flow charts.
● DTC P0106 will set if the MAP sensor signal fluctuates
faster than normal operation.
1.
Connect BREAKOUT BOX (Part No. HD-42682) (black)
● With the MAP sensor disconnected, the ignition control
between ICM connector [10A] and wire harness connec-
module should recognize a low voltage. If low voltage is
tor [10B]. See 4.6 BREAKOUT BOX: ICM.
observed, the ignition control module and harness are
2.
Use HARNESS CONNECTOR TEST KIT (Part No. HD-
not at fault.
41404), gray pin probes and patch cords.
● Gently place a jumper wire across MAP Sensor connec-
tor [80B] Terminals B and C using HARNESS CONNEC-
TOR TEST KIT (Part No. HD-41404), gray male probes
and patch cord. With the jumper in place, the ignition
control module should recognize a high voltage.
● MAP sensor output check. Using the VACUUM PUMP
(Part No. HD-23738A), apply a vacuum to the pressure
port of the MAP sensor. The signal voltage should lower
as the vacuum is applied.
2006 Sportster: Engine Management
4-35
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x0558x4x
Manifold
absolute
pressure
sensor
(MAP)
[80A]
[80B]
BK/W
R/W
V/W
R/W
BK/W
V/W
BK
[10B]
[10A]
Ignition Control Module (ICM)
Figure 4-25. MAP Sensor Circuit Diagram
Table 4-16. Wire Harness Connectors in Figure 4-25.
NO.
DESCRIPTION
TYPE
LOCATION
[10]
Ignition control module
12-place Deutsch
Under seat
Manifold Absolute Pressure (MAP)
3-place Packard
Top of intake manifold
[80]
sensor
4-36
2006 Sportster: Engine Management
HOME
Test 4.13 (Part 1 of 2)
MAP SENSOR: DTC P0106, P0107, P0108
1
With ignition ON, measure voltage between
Breakout Box cavity 11 (+) and cavity 4 (-).
With key ON, engine OFF, voltage must be
between 4.2 and 4.95 volts. With key ON,
engine running, voltage must be between
1.5-3.0 volts at hot idle.
Does voltage fit specifications?
YES
NO
Perform 4.7 WIGGLE TEST
to check for intermittents.
STOP
Are intermittents present?
Go to Test 4.13
(Part 2 of 2).
YES
NO
To identify the source of inter-
Replace MAP sensor. Clear DTCs.
mittents, start with box marked
See 4.5 SPEEDOMETER SELF
by Bold Asterisk under Test
DIAGNOSTICS. Road test.
4.13 (Part 2 of 2). Wiggle har-
Did check engine lamp illuminate and
ness while watching DVOM.
set DTC P 0106, P0107 or P0108?
YES
NO
Install original MAP sensor.
System
Replace ICM and road test
now OK.
again to verify.
Clear DTCs using speedometer self diagnostics. See
4.5 SPEEDOMETER SELF DIAGNOSTICS. Confirm
proper operation with no security lamp.
At some point in the flow chart you
may be instructed to jump directly
to the box with the bold asterisk.
Disregard the asterisk (but not the
instruction box) if your normal pro-
gression through the chart brings
you to this location.
2006 Sportster: Engine Management
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Test 4.13 (Part 2 of 2)
MAP SENSOR: DTC P0106, P0107, P0108
Continued from Test 4.13 (Part 1 of 2).
2
Check the 5 volt reference supply at
connector [80B]. With ignition ON,
measure voltage between terminal C
(R/W) and terminal A (BK/W).
Is voltage approximately 5.0 volts?
YES
NO.
NO.
Greater
Less
1
than 6V.
than 4.5V.
Disconnect ICM from Breakout Box.
OPEN CHECK: Measure resistance
1
2
between connector [80B] terminal B
Locate short to 12 volts on R/W
Disconnect ICM from Breakout Box.
and Breakout Box cavity 11 (black).
wire in wire harness. Repair as
Check continuity between connector [80B]
2
Is resistance less than 1 ohm?
necessary.
terminal C and Breakout Box cavity 3 (black).
Then measure continuity between connector
[80B] terminal A and Breakout Box cavity 4.
Is continuity present?
YES
NO
2
SHORT CHECK: Measure resis-
Locate and repair
YES
NO
tance between connector [80B]
open on V/W wire.
terminal B and chassis ground.
Is resistance greater than
1 meg ohm?
With MAP sensor connector [80]
Repair
disconnected, check resistance
open wire.
between Breakout Box cavities 3
(black) and 5 (black).
Is resistance greater than
1 meg ohm?
YES
NO
Replace MAP sensor.
Locate and repair
YES
NO
grounded V/W wire.
Replace ICM.
Locate and repair
Reprogram and
short between R/W
perform password
and ground wire.
learn.
Clear DTCs using speedometer self diagnostics. See
4.5 SPEEDOMETER SELF DIAGNOSTICS. Confirm
proper operation with no security lamp.
At some point in the flow chart you
may be instructed to jump directly
to the box with the bold asterisk.
Disregard the asterisk (but not the
instruction box) if your normal pro-
gression through the chart brings
you to this location.
4-38
2006 Sportster: Engine Management
HOME
DTC P0371, P0372, P0374
4.14
GENERAL
11339
Crank Position Sensor
See Figure 4-26. A DTC P0371, P0372 or P0374 will set if
the crankshaft position sensor
(CKP) signal is weak or
absent.
Table 4-17. Code Description
DTC
DESCRIPTION
P0371
Crankshaft position sensor shorted low
P0372
Crankshaft position sensor shorted high
Crankshaft position sensor not
P0374
detected/cannot synchronize
DIAGNOSTICS
Figure 4-26. Crank Position Sensor
Diagnostic Notes
1.
Connect BREAKOUT BOX (Part No. HD-42682) to wire
harness connector [10B] only, leaving ICM disconnected.
See 4.6 BREAKOUT BOX: ICM.
2.
One meg ohm is very high resistance. Some meters will
read infinity, OL, etc.
3.
Use HARNESS CONNECTOR TEST KIT (Part No. D-
41404), brown socket probes and patch cords.
4. For testing purposes, install sensor without running wir-
ing along normal path. Disconnect and route wiring prop-
erly if system is now OK.
2006 Sportster: Engine Management
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x0545x4x
Crank
Position
Sensor
(CKP)
R
BK
[79A]
[79B]
1
2
BK
R
BK
[10B]
[10A]
Ignition Control Module (ICM)
Figure 4-27. Crank Position Sensor Circuit Diagram
Table 4-18. Wire Harness Connectors in Figure 4-27.
NO.
DESCRIPTION
TYPE
LOCATION
[10]
Ignition control module
12-place Deutsch
under seat
[79]
Crankshaft position sensor
2-place Mini-Deutsch
lower left framerail
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2006 Sportster: Engine Management
HOME
Test 4.14 (Part 1 of 2)
CRANK POSITION SENSOR: DTC P0371, P0372, P0374
Connect Breakout Box to harness only,
1
leaving ignition control module disconnected.
Measure resistance between cavity 8 [10] and cavity 5
[10B] (black) on Breakout Box and
cavity 9 [10] (black) and cavity 5 of [10] (black)
2
on Breakout Box. Is resistance more than 1 megohm?
YES
NO
Measure voltage on Breakout Box
Disconnect connector [79]. Leaving ignition control module
between cavity 8 [10] (+) and cavity 5
disconnected, measure resistance between cavity 8 and
[10] (-) and also between cavity 9 [10]
cavity 5 [10B] (black) on Breakout Box. Also
(+) and cavity 5 of [10] (-).
measure resistance between cavity 9 [11B] (gray) and
Is voltage present?
cavity 5 [10B] (black) on Breakout Box. Is there still
continuity to ground (less than 1 megohm resistance)?
YES
NO
YES
NO
Disconnect connector [79]. Measure
Check for intermittent connection, pinched
Repair short to
Replace CKP
voltage on Breakout Box between
or damaged wires, and loose CKP sensor
ground on R or
sensor.
cavity 8 [10] (+) and cavity 5 [10] (-)
fastener. Conditions found?
BK wire between
and also between cavity 9 [10] (+)
connectors [10B]
and cavity 5 of [10] (-).
and [79B].
Is voltage present?
YES
NO
YES
NO
Locate and repair short to
Replace CKP
Repair as
voltage between red or black
sensor.
necessary.
wires between connector
[79B] and connector [10B]
at ICM.
STOP
Go to Test 4.14
(Part 2 of 2).
2006 Sportster: Engine Management
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Test 4.14 (Part 2 of 2)
CRANK POSITION SENSOR: DTC P0371, P0372, P0374
Continued from Test 4.14 (Part 1 of 2).
Connect DVOM to cavities 8 and 9 at
connector [10] on Breakout Box.
Set DVOM to AC volts and crank engine.
Does DVOM read 1 VAC minimum
during cranking?
YES
NO
With DVOM still connected, check for
Connect DVOM. At connector
intermittents using 4.7 WIGGLE TEST.
3
[79] Terminals 1 and 2, DVOM
Intermittents present?
should read 1 VAC
minimum while cranking.
Does it?
YES
NO
YES
NO
Repair as
4
Replace CKP sen-
Check for continuity between
Replace CKP
necessary.
sor. Clear codes
Terminal 8 [10B] and Terminal 1
sensor.
and retest. Code
[79B]. Is continuity present?
P0371, P0372 or
P0374 set?
YES
NO
YES
NO
Reinstall CKP
System
Repair open on BK wire
Repair open on R wire between
OK.
between Terminal 2 [79B] and
Terminal 1 [79B] and Terminal
sensor. Replace
Terminal 9 on connector [10B].
8 on connector [10B].
ICM. Reprogram
and perform pass-
word learn.
Clear codes using speedometer self diagnostics.
See
4.5 SPEEDOMETER SELF DIAGNOSTICS.
Confirm proper operation with no check engine
lamp.
4-42
2006 Sportster: Engine Management
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DTC P0501, P0502
4.15
GENERAL
10755
Vehicle Speed Sensor
See Figure 4-28. The vehicle speed sensor is powered and
monitored by the ICM. The ICM processes the vehicle speed
signal and transmits this signal to the TSM/TSSM and speed-
ometer through serial data.
Table 4-19. Code Description
DTC
DESCRIPTION
P0501
VSS sensor low
P0502
VSS sensor high/open
Figure 4-28. Vehicle Speed Sensor Location
DIAGNOSTICS
Diagnostic Notes
The reference numbers below correlate with the circled num-
bers on the Test 4.15 flow charts.
1. The speedometer has a built-in diagnostic mode. See
4.5 SPEEDOMETER SELF DIAGNOSTICS.
2. Use HARNESS CONNECTOR TEST KIT (Part No. HD-
41404), gray pin probe and patch cord.
3. Connect BREAKOUT BOX (Part No. HD-42682) (black)
between ICM connector [10A] and wire harness connec-
tor [10B]. See 4.6 BREAKOUT BOX: ICM.
4. Raise rear end of motorcycle and rotate rear wheel with
transmission in neutral.
2006 Sportster: Engine Management
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x0542b4x
Vehicle
1
1
BK/R
Speed
2
2
BK/BE
Sensor
3
3
BK
[65A]
[65B]
BK/R
BK
BK/BE
[10B]
[10A]
Ignition Control Module (ICM)
Figure 4-29. Vehicle Speed Sensor Circuit
Table 4-20. Wire Harness Connectors in Figure 4-29.
NO.
DESCRIPTION
TYPE
LOCATION
[10]
Ignition control module
12-Place Deutsch
under seat
[65]
Vehicle speed sensor
3-Place Packard
right rear top of crankcase
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2006 Sportster: Engine Management
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Test 4.15 (Part 1 of 2)
VEHICLE SPEED SENSOR: DTC P0501, P0502
1
Remove and inspect vehicle speed sensor. Inspect for
debris and clean if necessary. Place speedometer into
diagnostic mode and clear ICM DTC s. Connect all
circuits and ride motorcycle for approximately 1.0 mile
(1.6 km). Check for newly logged DTCs.
Any new DTCs present?
YES
NO
2
Check for continuity between socket 1 of
System OK.
connector [65B] (BK/R wire) and ground.
Is continuity present?
YES
NO
2
Repair short to ground.
Check for continuity between socket
1 of connector [65B] (BK/R wire) and
3
Breakout Box cavity 3 (black).
Is continuity present?
YES
NO
Check for continuity between
Repair open between BK/R
socket 3 of connector [65B] (BK
wire at connector [65B] and
wire) and Breakout Box cavity 4.
R/W wire at connector [10B].
Is continuity present?
YES
NO
Repair open on BK wire
STOP
between connectors [10B]
and [65B].
Go to. Test 4.15
(Part 2 of 2)
Clear DTCs using speedometer self diagnostics. See
4.5 SPEEDOMETER SELF DIAGNOSTICS. Confirm
proper operation with no security lamp.
2006 Sportster: Engine Management
4-45
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Test 4.15 (Part 2 of 2)
VEHICLE SPEED SENSOR: DTC P0501, P0502
2
Continued from Test 4.15 (Part 1 of 2).
3
Check for continuity between terminal 2 of connector
[65B] and Breakout Box cavity 10 (black).
Is continuity present?
YES
NO
4
Check for voltage on cavity 10
Repair open on BK/BE
(black) on breakout box. Meter
wire between connectors
should read 4-6 volts when gear
[10B] and [65B].
tooth is absent and 0-1 volts when
gear tooth is present.
Does it?
YES
NO
NO
NO
Voltage fluctuates from high
Battery voltage present.
No voltage present.
No voltage fluctuation from high
(4-6 volts) to low (0-1 volts).
(4-6 volts) to low (0-1 volts).
Replace ICM. Reprogram
Locate and repair short to
Measure continuity to
Replace vehicle
and learn password.
voltage on BK/BE wire
ground from cavity 10
speed sensor.
between [10B] and [65B].
(black) on breakout box.
Is resistance less than
100 ohms?
YES
NO
Locate and repair short to
Replace ICM. Reprogram
ground on BK/BE wire
and learn password.
between [10B] and [65B].
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2006 Sportster: Engine Management
HOME
DTC P0562, P0563
4.16
GENERAL
DIAGNOSTICS
Battery Voltage
Diagnostic Notes
The ignition control module (ICM) monitors battery voltage.
The reference numbers below correlate with the circled num-
The normal operating range is 8-16 volts while the engine is
bers on the Test 4.16 flow charts.
running.
1.
Was battery allowed to discharge? Was battery drawn
NOTE
down by a starting problem?
When either diagnostic trouble code (DTC) P0562 or P0563
a. Yes. Charge battery.
is set, the battery icon in the speedometer will illuminate.
b. No. See TROUBLESHOOTING under 1.7 CHARG-
● DTC P0562 is set if the ignition control module detects
ING SYSTEM.
battery voltage less than 12.2 volts at idle and voltage
2.
Connect BREAKOUT BOX (Part No. HD-42682) (black)
does not increase when engine speed is greater than
between ignition control module (ICM) connector [10A]
2000 RPM.
and wire harness connector [10B]. See 4.6 BREAKOUT
● DTC P0563 is set if the ignition control module detects
BOX: ICM.
battery positive voltage greater than 16.1 volts for more
3.
The ICM is monitoring voltage at ignition control module
than four seconds.
connector [10] (black) terminal 1.
● Low voltage generally indicates a loose wire, corroded
4.
This checks for voltage drops in the ignition control mod-
connections and/or a charging system problem.
ule circuit.
● A high voltage condition may be caused by a faulty volt-
a. Place (+) probe at battery positive terminal.
age regulator.
b. Place (-) probe at Breakout Box cavity 1.
5.
Remove Breakout Box at connectors [10A] and [10B],
reconnect ICM. Connect BREAKOUT BOX (Part No. HD-
Table 4-21. Code Description
42682) (black) and 6-pin Harness Adapters (Part no. HD-
42962) between wire harness connector [22A] and Right
DTC
DESCRIPTION
Hand Control harness connector [22B].
P0562
Battery voltage low
P0563
Battery voltage high
2006 Sportster: Engine Management
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x0559a4x
Voltage
BK
BK
Stator
Regulator
BK
BK
BK
BK
[46A] [46B]
[77A]
[77B]
A
B
BK
Engine
Stop Switch
R
[22B]
30 Amp
Ignition Switch
15 Amp
[22A]
Main Fuse
Ignition Fuse
R/BK
GY
W/BK
BK
BK
Battery
[10B]
[10A]
Ignition Control Module (ICM)
Figure 4-30. Battery Voltage Circuit Diagram
Table 4-22. Wire Harness Connectors in Figure 4-30.
NO.
DESCRIPTION
TYPE
LOCATION
[10]
Ignition control module
12-place Deutsch
under seat
[22]
Right handlebar controls
6-place Deutsch
under fuel tank
[46]
Voltage regulator to stator
2-place round molded
in front of engine crankcase
[77]
Voltage regulator (D.C. output)
2-place Packard
in front of engine crankcase
4-48
2006 Sportster: Engine Management
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Test 4.16 (Part 1 of 2)
BATTERY VOLTAGE: DTC P0562, P0563
1
Perform charging system tests.
Is charging system OK?
YES
NO
Repair
charging system.
2
With ignition ON, measure voltage drop
3
between battery positive (+) terminal
and Breakout Box cavity 1 (-) (black).
Is voltage drop greater than 0.5 volt?
4
YES
NO
5
With ignition ON, measure voltage drop
Check for voltage drop between
between battery positive (+) terminal
battery negative (-) terminal and
and Breakout Box cavity 4 (-) (black).
Breakout Box cavity 5 (+) (black).
Is voltage drop greater than 0.5 volt?
Is voltage drop greater than 0.5 volt?
YES
NO
YES
NO
With ignition ON, measure voltage drop
Repair or replace
Locate and repair
Problem is intermittent.
between battery positive (+) terminal
W/BK wire or
bad connection.
Perform 4.7 WIGGLE
and Breakout Box cavity 3 (-) (black).
terminals.
TEST.
Is voltage drop greater than 0.5 volt?
YES
NO
Inspect connector [22] for
corrosion or loose wires.
STOP
If above conditions are
not present, replace
engine stop switch.
Go to Test 4.16
(Part 2 of 2).
Clear DTCs using speedometer self diagnostics. See
4.5 SPEEDOMETER SELF DIAGNOSTICS. Confirm
proper operation with no security lamp.
2006 Sportster: Engine Management
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Test 4.16 (Part 2 of 2)
BATTERY VOLTAGE: DTC P0562, P0563
Continued from Test 4.16 (Part 1 of 2). With
ignition ON, measure voltage drop between
battery positive (+) terminal and GY terminal
on 15 amp ignition fuse (-).
Is voltage drop greater than 0.5 volt?
YES
NO
With ignition ON, measure voltage drop
Repair or replace GY
between battery positive (+) terminal and
wire or terminals.
R/BK terminal on 15 amp ignition fuse.
Is voltage drop greater than 0.5 volt?
YES
NO
With ignition ON, measure voltage drop
Replace fuse or
between battery positive (+) terminal and
fuse terminals.
terminal A of Maxi-Fuse (-).
Is voltage drop greater than 0.5 volt?
YES
NO
With ignition ON, measure voltage drop
Replace ignition
between battery positive (+) terminal and
switch or terminals.
terminal B of Maxi-Fuse (-).
Is voltage drop greater than 0.5 volt?
YES
NO
High resistance between Maxi-
Replace Maxi-Fuse.
Fuse and battery. Replace wire
or terminals.
Clear DTCs using speedometer self diagnostics. See
4.5 SPEEDOMETER SELF DIAGNOSTICS. Confirm
proper operation with no security lamp.
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2006 Sportster: Engine Management
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