Harley Davidson 2008 Sportster Models. Electrical Diagnostics Manual — page 8

Security Antenna Short-to-Ground: DTC B1143

Disconnect antenna connector [208] from

HFSM. Check for continuity between [208B]

terminal “2”,

“3” and ground.

Continuity (less than 1 ohm) present?

YES

Replace HFSM. Learn

Locate and repair short-to-ground.

password and perform set-up.

6879

6791

fc01142_en

2008 Sportster Diagnostics: TSM/HFSM 3-59

Security Antenna Short-to-Voltage: DTC B1144

With the ignition ON, check for voltage

between [208B] terminal “2”, “3” and ground.

Voltage present?

YES

Locate and repair

Replace HFSM. Learn

short-to-voltage.

password and perform set-up.

6879

6791

fc01143_en

3-60 2008 Sportster Diagnostics: TSM/HFSM

Security Antenna Open: DTC B1145

Check for resistance between connector

[208B] terminals “2” and “3”.

Is resistance between 3.7K ohms and 5.7 K ohms?

YES

Check for continuity between

Replace HFSM. Learn

[208B] terminal “3” and [209B] terminal

password and perform set-up.

“2”, and also between [208B]

6791

terminal “2” and [209B] terminal “1”.

Continuity present?

YES

Locate and repair open wire

Replace security

between connectors [208B]

antenna.

and [209B].

6878

6879

fc01144_en

2008 Sportster Diagnostics: TSM/HFSM 3-61

DTC B1154,

B1155

3.22

is shorted to ground at speeds greater than 10 MPH (16 km/h)

DIAGNOSTICS

for more than 60 seconds. Refer to Table 3-20.

PART NUMBER

TOOL NAME

HD-42682

BREAKOUT BOX

Diagnostic Tips

Diagnostic Trouble Codes (DTCs) B1154 and B1155 will set

when either the clutch switch circuit or the neutral switch circuit

Table 3-20. Clutch/Neutral Switch DTCs

DTC

SYMPTOM

START WITH FLOW CHART

B1154

Clutch switch short-to-ground

Clutch Switch Short-to-Ground: DTC B1154

B1155

Neutral switch short-to-ground

Neutral Switch Short-to-Ground: DTC B1155

2. If DTC is current (lamp on continuously, clear codes return

Diagnostic Notes

during operation), replace HFSM. If DTC is historic, check

Each reference number below correlates to a circled number

for intermittents.

on the flow chart(s).

3. A reading of several hundred ohms is normal due to the

1. Connect BREAKOUT BOX (Part No. HD-42682) to HFSM.

neutral indicator lamp (LED).

3.12 BREAKOUT BOX: TSM/HFSM

3-62 2008 Sportster Diagnostics: TSM/HFSM

em01152

Neutral

Indicator

Lamp

[20A]

[20B]

Clutch Switch

BK/R

[24A]

[24B]

To ECM

Ignition

Switch

[136B]

R/BK

[136A]

15 Amp

Instruments

Fuse

[33A] [33B]

Powertrain

Neutral

Ground

Switch

Point

GND 1

[30B]

[30A]

30 Amp

MAXIFUSE

TSM/HFSM

Battery

Engine Case

Ground Point

Figure 3-28. Clutch and Neutral Interlock Circuits

Table 3-21. Wire Harness Connectors

NO.

DESCRIPTION

TYPE

LOCATION

[20]

Instruments

12-place Molex

Under fuel tank

[24]

Left handlebar controls

8-place Molex

Under fuel tank

[30]

TSM/HFSM

12-place Deutsch

Under battery

2008 Sportster Diagnostics: TSM/HFSM 3-63

Clutch Switch Short-to-Ground: DTC B1154

Connect Breakout Box HD-42682 to the main harness, leaving the

CONNECTOR [30] disconnected. Measure continuity between

terminal “10” (Gray) (+) and terminal “12” (Gray) (-).

Is continuity present?

YES

Disconnect connector [24]. Measure

continuity between terminal “10” (Gray)

Replace HFSM. Learn password

(+) and terminal “12” (Gray) (-) on

and perform set-up.

Breakout

Box. Is continuity present?

6791

YES

Locate and repair short to ground

Locate and repair

on (BK/R) wire in wire

short-to-ground in

in main wiring harness

left handlebar switch

between [30B] and [24B).

wiring.

5861

NOTE

This DTC may occur if the vehicle is ridden with clutch disengaged

(pulled in) at speeds greater than 10 MPH (16 km/h)

fc01145_en

for more than 60 seconds (coasting down a long mountain road).

3-64 2008 Sportster Diagnostics: TSM/HFSM

Neutral Switch Short-to-Ground: DTC B1155

With the transmission in 1st or 2nd gear, connect

Breakout Box HD-42682 to the main harness,

leaving the HFSM disconnected. Measure

continuity between terminal “4” (Gray) and

terminal “12” (Gray).

Is continuity (less than 10 ohms) present?

YES

Disconnect neutral switch [136]. Measure

Replace HFSM. Learn password

continuity between terminal “4” (Gray) and

and perform set-up.

terminal “12” (Gray) on breakout box.

Is continuity (less than 10 ohms) present?

6791

YES

Locate and repair short to

Replace neutral switch.

ground on (TN) wire in

main wiring harness.

5157

5862

fc01146_en

2008 Sportster Diagnostics: TSM/HFSM 3-65

DTC U1016,

U1255

3.23

GENERAL

ed02835

The serial data connector provides a means for the Electronic

Control Module (ECM) (see Figure 3-30), TSM/HFSM, and

speedometer to communicate their current status. When all

operating parameters on the serial data bus are within specific-

ations, a state of health message is sent between the compon-

ents. A Diagnostic Trouble Code (DTC) U1016 indicates that

the ECM is not capable of sending this state of health message.

A DTC U1255 indicates that no messages were present during

power up of the current key cycle. A DTC U1016 indicates that

there was communication on the data bus since power up, but

communication was lost or interrupted during that key cycle.

Table 3-22. Code Description

DTC

CONDITION

U1016

Loss of all ECM serial data (state of

Figure 3-29. ECM Location

health)

U1255

Serial data error/missing message

DIAGNOSTICS

PART NUMBER

TOOL NAME

HD-42682

BREAKOUT BOX

HD-43876

BREAKOUT BOX

Diagnostic Notes

Each reference number below correlates to a circled number

on the flow chart(s).

1. Connect BREAKOUT BOX (Part No. HD-42682) (gray)

between TSM/HFSM connector [30A] and wire harness

connector [30B]. See 3.12 BREAKOUT BOX: TSM/HFSM.

2. Connect BREAKOUT BOX (Part No. HD-43876) between

wire harness and ECM. See 4.7 BREAKOUT BOX: EFI.

3-66 2008 Sportster Diagnostics: TSM/HFSM

Tachometer (not present on all models)

em01181

Speedometer

TSM/TSSM/HFSM

[39A]

6 7

[108A]

[39B]

6 7

[108B]

[30A]

[30B]

LGN/V

BN/GY

O/W

12V

[20A]

(Switched)

[20B]

R/GY

O/W

12V ACC

12V

Fuse

(Batt)

BN/GY

12V BATT

12V

Fuse

(Switched)

LGN/V

R/BK

12V INSTR

12V

Fuse

(Switched)

Data Link

LGN/V

Connector

R/BK

12V IGN

Fuse

[91A]

[78]

ECM

Figure 3-30. Serial Data Circuit

Table 3-23. Wire Harness Connectors

NO.

DESCRIPTION

TYPE

LOCATION

[20]

Instruments

12-place Molex

Under fuel tank

[30]

TSM/HFSM

12-place Deutsch

Under battery

[39]

Speedometer

12-place Packard

Back of speedometer

[78]

Electronic Control Module (ECM)

36-place Packard

Under seat

[91]

Data link connector

4-place Deutsch

On battery strap, behind left side cover

[108]

achometer (if equipped)

12-place Packard

Back of tachometer

2008 Sportster Diagnostics: TSM/HFSM 3-67

Loss of ECM Serial Data: DTC U1016; Serial Data Error/Missing Message: DTC 1255

Can you read ECM hardware part number?

See 3.11 SPEEDOMETER SELF

DIAGNOSTICS.

YES

NO or “No Rsp”

Check continuity between

While wiggling harness, check continuity

terminal “3” (Gray) of TSM/HFSM

between terminal “3” (Gray) of

Breakout

TSM/HFSM Breakout Box and terminal

Box and terminal “5” of ECM

“5” of ECM Breakout Box.

Breakout Box.

Continuity present?

YES

Replace ECM.

Repair open on

Clear codes. Test ride.

Repair intermittent

Reprogram and learn

(LGN/V) wire.

Did DTC U1016 return?

on (LGN/V) wire.

password.

YES

Replace ECM.

No trouble found.

Reprogram and learn

password.

fc01147_en

Clear DTCs using speedometer self diagnostics. See 3.11

SPEEDOMETER SELF DIAGNOSTICS. Confirm proper

operation with no check engine lamp.

3-68 2008 Sportster Diagnostics: TSM/HFSM

DTC U1300,

U1301 OR BUS ER

3.24

DIAGNOSTICS

ed01340

See Figure 3-31. The typical serial data voltage range is 0 volts

(inactive) to 7 volts (active). Due to the short pulse, voltages

will be much lower on a DVOM. In analog mode, a DVOM

reading serial data will show continuous voltage when active,

typically 0.6-0.8 volts. The range for acceptable operations is

0-7.0 volts.

Diagnostic Tips

•

If serial data is shorted, these Diagnostic Trouble Codes

(DTCs) will automatically cause the check engine lamp to

illuminate. The odometer will read "Bus Er" in this condi-

tion.

•

DTCs P1009 and P1010 may accompany DTCs U1300

and U1301.

Figure 3-31. Data Link Connector [91A]

Diagnostic Notes

If a U1300, U1301 or "BUS Er" is present, perform diagnostic

procedures listed in 4.12 STARTS, THEN STALLS.

Table 3-24. Code Description

DTC

DESCRIPTION

START WITH FLOW CHART

U1300

Serial data low

4.12 STARTS, THEN STALLS

U1301

Serial data open/high

4.12 STARTS, THEN STALLS

2008 Sportster Diagnostics: TSM/HFSM 3-69

TSM/HFSM:

PASSWORD LEARN

3.25

GENERAL

PASSWORD LEARNING

If the ECM or TSM/HFSM is faulty, follow the instructions in

To perform password learning procedure, refer to Table 3-26.

the Service Manual for ECM or TSM/HFSM replacement. Then,

When finished, continue with all instructions under 3.3 H-DSSS

to determine if password learn is necessary, refer to Table 3-25.

ACTUATION.

Always perform all appropriate instructions under 3.3 H-DSSS

Table 3-25. Password Learn

ACTUATION after TSM/HFSM replacement or removal.

DEVICE REPLACED

IS PASSWORD LEARN

NOTE

NECESSARY?

Fob assignment must be performed at an authorized Harley-

ECM

Yes

Davidson dealer using Digital Technician.

TSM

No *

TSM/HFSM

Yes

* If a TSM has been replaced by a HFSM, or a HFSM has

been replaced by a TSM, password learn is necessary.

Table 3-26. Setting TSM/HFSM and ECM Password

NO.

ACTION

CONFIRMATION

NOTES

Ignition must be turned off for at least 15 seconds.

With Ignition Switch turned off,

Check Engine Lamp and

Security Lamp will be off.

Install new TSM/HFSM or ECM. Perform all steps under

3.3 H-DSSS ACTUATION.

Set Engine Stop Switch to RUN.

Turn Ignition Switch ON.

Verify Check Engine Lamp

TSM/HFSM enables start

and Security Lamp illuminate

relay.

and then turn off.

Attempt normal start one time.

Engine starts and stalls.

Password has not been

Check Engine Lamp illumin-

learned. ECM sets DTC

ates and stays on.

P1009.

Wait

ten seconds. Security Lamp will illuminate and stay

Security Lamp illuminates.

ECM enters Password

on.

Learning mode for ten

minutes. Do not cycle Ignition

Switch or interrupt vehicle

power or Password Learn will

be unsuccessful.

Wait until Security Lamp turns off

This takes ten minutes.

Quickly

(within two seconds) turn Ignition Switch

ECM must not be allowed to

OFF-ON.

shutdown.

Wait until Security Lamp turns off

This takes ten minutes.

Quickly

(within two seconds) turn Ignition Switch

ECM must not be allowed to

OFF-ON.

shutdown.

Wait until Security Lamp turns off

This takes ten minutes.

Quickly

(within two seconds) turn Ignition Switch

ECM must not be allowed to

OFF-ON.

shutdown.

Turn Ignition Switch OFF. Wait 15 seconds before

turning Ignition Switch on. Turn Ignition Switch ON and

start engine to confirm successful Password Learn

procedure. Clear DTCs.

Perform all steps under 3.3 H-DSSS ACTUATION.

3-70 2008 Sportster Diagnostics: TSM/HFSM

HFSM MAINTENANCE

3.26

GENERAL

NOTES

See Figure 3-33 and Figure 3-34. Early style siren will work

The HFSM uses a battery in the fob and siren. These are the

with both TSSM and HFSM. Late style siren will only work with

only parts requiring periodic maintenance.

HFSM.

HANDS-FREE FOB

The internal siren battery may not charge if the vehicle's battery

is less than 12.5 volts.

Schedule

Replace the fob battery every year.

Battery Replacement: Early Style Siren

1. Disarm system and remove siren.

Battery Replacement

2. See Figure 3-33. Remove battery cover.

1. See Figure 3-32. Open the fob case.

a. Place the siren module on a flat and sturdy table with

a. Place a thin blade in the thumbnail slot (1) between

the potted section (area with epoxy covering circuit

the 2 halves of the case.

board) facing up and towards you.

b. Slowly twist the blade.

b. Position a knife blade at a 45 degree angle to the long

2. Replace battery (2).

side of the siren case. Insert the knife blade between

the siren case and battery cover at one of the two

a. Remove the original battery.

accessible corners of the battery cover. Keep the

b. Install a new battery with the positive (+) side down.

blade slightly higher towards the battery cover as this

Use a Panasonic® 2032 or equivalent.

helps keep the blade away from the battery seal.

3. With O-ring (3) in place, align case halves and snap case

c. Slowly twist the blade towards the battery cover and

halves together.

the cover will pop off.

NOTE

ed02055

For protection against corrosion, battery terminals and battery

clip are covered with a special grease. Do not wipe away this

substance. Apply all available existing grease to terminals on

new battery.

3. Replace battery by removing old battery from polarized

battery clip. Install a new 9 volt nickel metal hydride bat-

tery.

NOTE

Only a 9 volt nickel metal hydride battery should be used in

the siren.

4. Reinstall battery cover.

a. Carefully replace the rubber seal.

b. Align battery cover with case placing round corners

on cover away from connector [142A]. Snap cover

into place.

5. Install siren and check operation. If siren is working prop-

erly, it will respond with two chirps after receiving the arm

command.

Battery Replacement: Late Style Siren

1. Thumbnail slot

1. Disarm system and remove siren.

2. Battery (Panasonic 2032)

3. O-ring

2. See Figure 3-34. With a small screwdriver or pick, push

the catches (1) in through the two slots (2) in the end of

Figure 3-32. Open Fob: HFSM

the siren to release the battery cover (3).

NOTE

SMART SIREN (IF INSTALLED)

For protection against corrosion, battery terminals and battery

clip are covered with a special grease. Do not wipe away this

Schedule

substance. Apply all available existing grease to terminals on

The siren's internal 9 volt battery is rechargeable and does not

new battery.

need to be replaced on a regular basis. Battery life under

3. Replace battery (4) by removing old battery from polarized

normal conditions is approximately three to six years.

battery clip.

2008 Sportster Diagnostics: TSM/HFSM 3-71

4. Recharge and re-install or install a new 9 volt nickel metal

ed02958

hydride battery.

NOTE

Only a nickel metal hydride nine-volt battery should be used

in the siren.

5. Reinstall battery cover (3).

a. Carefully replace the rubber seal (5) on the cover.

b. Align battery cover with case placing round corners

on cover away from connector [142A] (6).

c. Snap cover into place.

6. Install siren and check operation. If siren is working prop-

erly, it will respond with two chirps after receiving the arm

command.

Catch

2. Slot

Cover

ed03016

9 volt battery

Rubber seal

Connector [142A]

Figure 3-34. Siren Battery Compartment (Late Style Siren)

1. Cover

2. Battery

3. Connector [142A]

Figure 3-33. Battery Compartment (Early Style Siren)

3-72 2008 Sportster Diagnostics: TSM/HFSM

SUBJECT

PAGE NO.

4.1 SPECIFICATIONS

4-1

4.2 EFI SYSTEM

4-2

4.3 EFI DIAGNOSTIC INTRODUCTION

4-4

4.4 CHECKING FOR DIAGNOSTIC TROUBLE CODES: EFI

4-5

4.5 INITIAL DIAGNOSTIC CHECK: EFI

4-7

4.6 SPEEDOMETER SELF DIAGNOSTICS

4-15

4.7 BREAKOUT BOX: EFI

4-17

4.8 WIGGLE TEST

4-18

4.9 INTAKE LEAK TEST

4-19

4.10 ENGINE CRANKS, BUT WILL NOT START

4-21

4.11 NO ECM POWER

4-28

4.12 STARTS, THEN STALLS

4-32

4.13 FUEL SYSTEM ELECTRICAL TEST

4-36

4.14 SYSTEM RELAY CHECK

4-43

4.15 FUEL PRESSURE TEST

4-49

4.16 IDLE AIR CONTROL

4-53

4.17 MISFIRE AT IDLE OR UNDER LOAD

4-58

4.18 DTC P0107, P0108, P0112, P0113

4-64

4.19 DTC P0117, P0118

4-71

4.20 DTC P0122, P0123

4-75

4.21 DTC P0131, P0132, P0134, P0151, P0152, P0154

4-79

4.22 DTC P0261, P0262, P0263, P0264

4-84

4.23 DTC P0373, P0374

4-90

4.24 DTC P0501, P0502

4-93

4.25 DTC P0562, P0563

4-97

4.26 DTC P0603, P0605

4-101

4.27 DTC P1009, P1010

4-102

4.28 DTC P1351, P1352, P1354, P1355

4-105

4.29 DTC P1501, P1502

4-110

4.30 DTC U1064, U1255

4-115

4.31 DTC U1097, U1255

4-118

NOTES

SPECIFICATIONS

4.1

SPECIFICATIONS

ed02838

Table 4-1. General Specifications

IGNITION

DATA

Idle speed

1000 ± 50 RPM

Spark plug size

12 mm

Spark plug gap

0.038-0.043 in (0.97-1.09 mm)

Spark plug type

Harley-Davidson

No. 6R12 (no substitute)

Ignition

coil primary res-

0.3-0.7 ohms

istance at room temper-

ature

Ignition coil secondary

1500-2400 ohms

resistance at room tem-

1. ECM fuse

perature

2. Fuel pump fuse

3. Spare fuse (3; 1 empty)

4. Start relay

Table 4-2. Fuse Ratings

5. System relay

ITEM

RATING (AMPERES)

6. Ignition fuse

7. Instruments fuse

ECM fuse

8. Accessories fuse

Fuel pump fuse

9. Battery fuse

Ignition fuse

10. Lights fuse

11. P & A ignition fuse

Instruments fuse

12. Open

Accessory fuse

13. MAXIFUSE

Battery fuse

Figure 4-1. Fuses and Relays

Lights fuse

P&A ignition fuse

Main fuse

2008 Sportster Diagnostics: Engine Management 4-1

EFI SYSTEM

4.2

The CKP sensor is located in the front left side of the crank-

GENERAL

case. The CKP sensor generates an AC signal which is sent

The engine management system consists of the following

to the ECM where it is used to reference engine position (TDC)

components:

and speed. It functions by taking readings off the 30 teeth on

the left side flywheel (two teeth are missing to establish a ref-

•

Electronic Control Module (ECM).

erence point).

•

Crankshaft Position (CKP) Sensor.

The TMAP sensor is located on top of the intake manifold. The

•

Combination Intake Air Temperature

(IAT)/Manifold

TMAP sensor monitors the intake manifold pressure (vacuum)

Absolute Pressure (TMAP) Sensor.

and intake air temperature and sends the information to the

ECM where the module adjusts the spark timing and fuel curve

•

Idle Air Control (IAC).

for optimum performance.

•

Throttle Position (TP) Sensor.

The BAS is within the TSM/TSSM/HFSM. If the vehicle tips

•

Vehicle Speed Sensor (VSS).

over, the engine will be shut off. Once the sensor is tripped,

the motorcycle must be uprighted, turned off and then on again

•

Turn Signal Module (TSM) or optional, factory-installed

before the engine can be restarted. This is communicated

Turn Signal Security Module (TSSM) (Japan/Korea) or

across the data bus.

Hands-Free Security Module (HFSM). This includes an

integrated Bank Angle Sensor (BAS).

Front and rear coils fire each spark plug independently (one

cylinder at a time - no wasted spark). The coil also has an extra

•

Ignition Coil.

terminal to monitor current on the coil secondary circuit. This

•

Jiffy Stand Sensor (HDI).

is used for knock detection and combustion diagnostics.

•

Oxygen Sensors.

The ignition system gives a spark near top dead center for

starting. At RPM and loads above this, the system gives a

The ECM is mounted under the seat. It computes the spark

spark advance that varies between 0 and 50.

advance for proper ignition timing based on sensor inputs from

CKP, TMAP and TP sensors, and regulates the low-voltage

The IAT, ET, TP and oxygen sensors are used to provide

circuits between battery and ignition coil.

information to the ECM to fine tune spark and fuel delivery.

The VSS is used as an input for idle speed control.

The ECM contains all of the solid state components used in

the ignition system. The dwell time for the ignition coil is also

The oxygen sensors monitor the exhaust gas for oxygen con-

calculated in the microprocessor and is dependent upon battery

tent. The fuel/air mixture is then adjusted to maintain an optimal

voltage. The programmed dwell is an added feature to give

air/fuel ratio.

adequate spark at all speeds. (The ECM has added protection

TROUBLESHOOTING

against transient voltages, continuous reverse voltage protec-

tion, and damage due to jump starts.) The ECM is fully

See the diagnostic charts for troubleshooting information.

enclosed to protect it from vibration, dust, water or oil. This unit

is a non-repairable item. If it fails, it must be replaced.

4-2 2008 Sportster Diagnostics: Engine Management

Y/GN

em01200

CKP

System

[78A]

[78B]

87A

Relay

ECM

[79B]

[79A]

BE/GY

GN/O

CKP (+)

W/BK

CKP (-)

System relay

GN/O

[119B]

Fuse Block

Ignition Coil

Y/GN

Spark Plugs

Rear coil

Y/BE

Front coil

BE/O

15 Amp

[83B] [83A]

ECM Fuse

Battery

BE/GY

30 Amp

15 Amp

Ignition

MAXIFUSE

Ignition Fuse

Switch

R/BK

Y/GN

[33B]

Front injector

W/Y

Front

Battery

[84B]

[84A]

Injector

Engine Case

Y/GN

Ground Point

Fuel Pump

Rear injector

GN/GY

Rear

[85B]

[85A]

Injector

Y/GN

O/GN

15 Amp

IAC (A) low

BE/GN

Fuel Pump

Idle

Fuse

IAC (B) high

BN/R

Air

IAC (B) low

BK/PK

Control

[141A]

[141B]

IAC (A) high

BK/O

GND 1

Front O₂

Sensor

Switch power

W/BK

[87B]

[87A]

BK/W

Intake air temp

LGN/Y

TMAP

Sensor

[138A]

R/W

MAP sensor input

V/W

[138B]

[80B]

[80A]

Rear O₂

Sensor

BK/W

5V sensor power

R/W

Sensor

TPS input

GY/V

[137A]

[145A]

[145B]

[88B]

[88A]

[137B]

Engine temp

PK/Y

BK/W

Sensor

[90B]

[90A]

Oxygen sensor A

PK/O

5V sensor ground

BK/W

Oxygen sensor B

PK/GN

Serial data link

LGN/V

speedometer

Engine

and

W/BK

Stop

tachometer

Switch

[20B]

[20A]

BK/R

[22B]

[22A]

Data Link

VSS input

BK/BE

Ground

Connector

LGN/V

Vehicle

[65B]

[65A]

Speed

Sensor

[91A]

Ground

GND 1

[30B]

[30A]

GND 1

TSM/TSSM/HFSM

Figure 4-2. EFI System Circuit

2008 Sportster Diagnostics: Engine Management 4-3

EFI DIAGNOSTIC INTRODUCTION

4.3

SYSTEM PROBLEMS

ed02839

All system problems fall into at least one of three general cat-

egories.

No Start

The engine cranks over freely, but will not start. This does not

include situations where the engine will not crank, such as a

security disabled starter, dead battery, etc. This condition

assumes that all obvious checks (fuel in tank, etc.) have been

made.

Poor Performance

The engine starts but there are performance problems. These

problems may include poor fuel economy, rough idle, engine

misfire, engine hesitation, severe spark knock, etc.

Check Engine Lamp

See Figure 4-3. The check engine lamp indicates the Electronic

Control Module (ECM) has determined a fault condition exists.

There may also be starting or performance problems.

Figure 4-3. Check Engine Lamp

RESOLVING PROBLEMS

To resolve system problems, five basic steps are involved. In

order of occurrence, they are:

1. Check for Diagnostic Trouble Codes (DTCs) by using

speedometer self diagnostics. See 4.4 CHECKING FOR

DIAGNOSTIC TROUBLE CODES: EFI.

2. Retrieve DTCs by using speedometer self diagnostics.

See 4.6 SPEEDOMETER SELF DIAGNOSTICS.

3. Diagnose system problems. This involves using special

tools and the diagnostic flow charts in this section.

4. Correct problems through the replacement and/or repair

of the affected components.

5. After repairs are performed, the work must be validated.

This involves clearing the DTCs and confirming proper

vehicle operation as indicated by the lack of DTCs.

4-4 2008 Sportster Diagnostics: Engine Management

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Harley Davidson 2008 Sportster Models. Electrical Diagnostics Manual — page 8

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