Here's my compilation of Check Engine Light information for Harley-Davidson motorcycles.
I've gathered this information from other websites I came across when my Check Engine Light came on and I didn't know why, and I didn't want to go to the dealer to find out
.

For a list of places to get H-D (and other) parts at a discount, click here.

Check Engine Lamp Diagnostics: EFI

General

If the check engine lamp shows no current or historic codes at key ON then no codes will be flashed out at the check engine lamp when the diagnostic test wire is installed.

Activation

Use of check engine lamp diagnostics assumes that the SCANALYZER (Part No. HD-41325) is not available.

  1. Remove seat. Remove protective cover from data connector
  2. To activate the diagnostic feature of the check engine lamp, proceed as follows:
  3. a. See Fig. 5-10. Create diagnostic test wire from parts shown.

    1. See Figure 5-11. Install diagnostic test wire across Terminal 1 and Terminal 2 on the data connector (91A)
    2. See Figure 5-12. Turn the ignition key ON and then wait approximately 9 seconds (4 seconds lamp ON, 5.4 seconds lamp OFF) for check engine lamp to start flashing.
  4. All trouble codes are sent out as a series of flashes. To retrieve the first digit of the trouble code simply observe the number of times the lamp flashes.
    1. The lamp will then flash one or more times to indicate the first digit of the trouble code. For example, three blinks equals 3. The length of the time the lamp is illuminated and the length in which it is off are each about 0.5 seconds in duration.
  1. The second digit follows:
    1. Following the transmission of the first digit there is a 1.2 second pause in which the lamp is off.
    2. The lamp will then flash one or more times to indicate the second digit of the trouble code. Count the number of times the lamp flashes to retrieve the second digit. For example, an additional five blinks would equal 5. If you link the 3 blinks from the first digit and combine it with the second 5 blinks the numbers represent trouble code 35 (tachometer).
  1. If more than one trouble code is sent:
    1. Following transmission of the second digit of the first code, there is a 3 second pause in which the lamp is off.
    2. Once all codes have been sent, the data string is repeated. When you have recorded the same trouble code twice, it is an indication that the transmission has been restarted and that all trouble codes have been retrieved.

DTC

Check Engine Lamp Code

Fault Condition

Ranking

Solution

P0107

12

MAP sensor open/low

17

5.21 DTC P0107, P0108

P0108

12

MAP sensor high

15

5.21 DTC P0107, P0108

P0112

15

IAT sensor voltage low

21

5.22 DTC P0112, P0113

P0113

15

IAT sensor voltage high

22

5.22 DTC P0112, P0113

P0117

14

ET sensor voltage low

19

5.23 DTC P0117, P0118

P0118

14

ET sensor open/high

20

5.23 DTC P0117, P0118

P0122

11

TP sensor open/low

15

5.24 DTC P0122, P0123

P0123

11

TP sensor high

15

5.24 DTC P0122, P0123

P0261

23

Front injector open/low

27

5.25 DTC P0261, P0262, P0263, P0264

P0262

23

Front injector high

29

5.25 DTC P0261, P0262, P0263, P0264

P0263

32

Rear injector open/low

25

5.25 DTC P0261, P0262, P0263, P0264

P0264

32

Rear injector high

30

5.25 DTC P0261, P0262, P0263, P0264

P0373

41

CKP sensor intermittent

13

5.26 DTC P0373, P0374

P0374

41

CKP sensor synch error

14

5.26 DTC P0373, P0374

P0501

43

VSS sensor low

39

5.27 DTC P0501, P0502

P0502

43

VSS sensor high

40

5.27 DTC P0501, P0502

P0505

34

Loss of idle speed control

55

5.18 Idle Air Control

P0562

16

Battery voltage low

33

5.28 DTC P0562, P0563

P0563

16

Battery voltage high

34

5.28 DTC P0562, P0563

P0603

54

ECM EEPROM error

5

5.29 DTC P0603, P0605

P0605

53

ECM flash error

1

5.29 DTC P0603, P0605

P1001

33

System relay coil open/low

7

5.16 SYSTEM RELAY CHECK

P1002

33

System relay coil HIGH/SJHORTED

8

5.16 SYSTEM RELAY CHECK

P1003

33

System relay contacts open

9

5.16 SYSTEM RELAY CHECK

P1004

33

System relay contacts closed

10

5.16 SYSTEM RELAY CHECK

P1009

N/A

Incorrect password

11

5.30 DTC P1009, P1010

P1010

N/A

Missing password

12

5.30 DTC P1009, P1010

P1351

24

Front ignition coil open/low

23

5.31 DTC P1351, P1352, P1354, P1355

P1352

24

Front ignition coil high/shorted

25

5.31 DTC P1351, P1352, P1354, P1355

P1353

24

Front cylinder no combustion

54

5.20 COMBUSTION ABSENT/INTERMITTENT

P1354

25

Rear ignition coil open/low

24

5.31 DTC P1351, P1352, P1354, P1355

P1355

25

Rear ignition coil high/shorted

25

5.31 DTC P1351, P1352, P1354, P1355

P1356

25

Front cylinder no combustion

54

5.20 COMBUSTION ABSENT/INTERMITTENT

P1651

N/A

Check engine light open/low

41

5.10 NO CHECK ENGINE LAMP AT KEY ON

5.11 CHECK ENGINE LAMP ON CONTINUOUSLY

P1652

N/A

Check engine light high

44

5.10 NO CHECK ENGINE LAMP AT KEY ON

P1653

35

Tachnometer low

45

5.32 DTC P1653, P1654

P1654

35

Tachometer high

46

5.32 DCT P1653, P1654

U1064

61

Loss of TSM/TSSM serial data

5

5.33 DTC U1064

U1300

63

Serial data low

2

5.14 STARTS, THEN STALLS

U1301

63

Serial data open/high

3

5.14 STARTS, THEN STALLS

 

Figure 5-12

 

 

----------------EFI Trouble Codes from another web page -----------------

How To Determine Trouble Codes Stored By The ECM For EFI-Equipped FLTs *

(* Based on information gleaned from the 1998-2001 FLT Service Manuals **)
(** Special thanks to HogDoctor for supplying the information used in making this page)
Knowing which trouble codes are stored by your bike's ECM can greatly assist you in determining the source of a problem you are having. In order to check the codes on an EFI-equipped Electra Glide (FLHTC/U-I), Road Glide (FLTR-I) or Road King (FLHRC-I) without the benefit of a scanalyzer, do the following:

-----And another website---------

1. Remove right side saddlebag and side cover if so equipped. Remove protective plug from data link connector.

2. To activate the diagnostic feature, proceed as follows:
a. Create diagnostic test wire or use a female spade clip.
b. Install diagnostic test wire across Terminals 1 and 2 on the data link connector.
c. Turn Ignition/Light Key Switch to IGNITION and wait approximately 10 seconds (4 seconds lamp ON, 6 seconds lamp OFF) for check engine lamp to start flashing.

3. All trouble codes are sent out as a series of flashes. To retrieve the first digit of the trouble code simply observe the number of times the lamp flashes.
a. The lamp will then flash one or more times to indicate the first digit of the trouble code.

b. The length of time the lamp is illuminated and the length of time in which it is off are each about 0.5 second in duration.

4. The second digit follows:
a. Following the transmission of the first digit, there is a 1.2 second pause in which the lamp is off.
b. The lamp will then flash one or more times to indicate the second digit of the trouble code. Count the number of times the lamp flashes to retrieve the second digit.

5. If more than one trouble code is sent:
a. Following transmission of the second digit of the first code, there is a 3 second pause in which the lamp is off.
b. Once all codes have been sent, the data string is repeated. When you have recorded the same trouble code twice, it is an indication that the transmission has been restarted and that all trouble codes have been retrieved.

IMPORTANT NOTE ..If diagnostic test wire is installed across Pins 1 and 2 on connector in lieu of a Scanalyzer, the ECM is placed in a diagnostic test mode and the engine will start. The test wire must be removed from the data connector and the ignition switch turned OFF or the check engine lamp will continue to flash codes. A historic trouble code resides in the memory of the ECM until the code is cleared by use of the Scanalyzer or a total of 50 trips has elapsed. A “trip” consists of a start and run cycle, the run cycle lasting at least 30 seconds. After the 50 trip retention period, the trouble code is automatically erased from memory (that is, assuming no subsequent faults of the same type are detected in that period). The numbers after the 'historic' or 'current' is the speedo code number, but without the electrical diognostics manual you're peeing into the wind.

1 Current 53 ECM flash error
2 Historic 53 ECM flash error
3 Current 54 ECM EEPROM error
4 Historic 54 ECM EEPROM error
5 Current 63 ECM serial data low
6 Current 63 ECM serial data open/high
7 Current 63 TSSM serial data low
8 Current 63 TSSM serial data open/high
9 Current 61 Loss of TSM/TSSM serial data
10 Current 14 Loss of all ECM serial data (state of health)
10 24 Loss of vehicle speed
10 33 Loss of vehicle inhibit motion
10 43 Loss of power train security status
11 Current 33 System relay contacts open
12 Current 33 System relay coil high/shorted
13 Current 33 System relay coil open/low
14 Current 33 System relay contacts closed
15 Current 99 Incorrect password
16 Current 99 Missing password
17 Current 41 CKP sensor intermittent
18 Current 41 CKP sensor synch error
19 Current 11 TP sensor open/low
20 Current 11 TP sensor high
21 Current 12 MAP sensor open/low
22 Current 12 MAP sensor high
23 Current 14 ET sensor voltage low
24 Current 14 ET sensor open/high
25 Current 15 IAT sensor voltage low
26 Current 15 IAT sensor open/high
27 Current 24 Front ignition coil open/low
28 Current 25 Rear ignition coil open/low
29 Current 24 Front ignition coil high/shorted
30 Current 25 Rear ignition coil high/shorted
31 Current 24 Front cylinder combustion intermittent
32 Current 25 Rear cylinder combustion intermittent
33 Current 23 Front injector open/low
34 Current 32 Rear injector open/low
35 Current 23 Front injector high
36 Current 32 Rear injector high
37 Current 16 Battery voltage low
38 Current 16 Battery voltage high
39 Current 43 VSS sensor low
40 Current 43 VSS sensor high
41 Current N/A (no speedo code for this) Check engine light open/low NO CHECK ENGINE LAMP AT KEY ON or CHECK ENGINE LAMP ON CONTINUOUSLY
42 Current N/A (no speedo code for this) Check engine light high NO CHECK ENGINE LAMP AT KEY ON
43 Current 35 Tachometer low
44 Current 35 Tachometer high
45 Current 25 Rear cylinder no combustion
46 Current 24 Front cylinder no combustion
47 Current 34 Loss of idle speed control IDLE AIR CONTROL
48 Current 35 Accelerometer fault
49 Current 34 Starter output high
50 Current 25 Ignition enable output high
51 Current 21 Left turn output fault
52 Current 22 Right turn output fault
53 Current 11 Battery voltage high
54 Current 31 Alarm output low
55 Current 32 Alarm output high
56 Current 41 Ignition switch open/low
57 Historic 63 ECM serial data low
58 Historic 63 ECM serial data open/high
59 Historic 63 TSSM serial data low
60 Historic 63 TSSM serial data open/high
61 Historic 61 Loss of TSM/TSSM serial data
62 Historic 14 Loss of all ECM serial data (state of health)
63 Historic 33 System relay contacts open
64 Historic 33 System relay coil high/shorted
65 Historic 33 System relay coil open/low
66 Historic 33 System relay contacts closed
67 Historic 99 Incorrect password
68 Historic 99 Missing password
69 Historic 41 CKP sensor intermittent
70 Historic 41 CKP sensor synch error
71 Historic 11 TP sensor open/low
72 Historic 11 TP sensor high
73 Historic 12 MAP sensor open/low
74 Historic 12 MAP sensor high
75 Historic 14 ET sensor voltage low
76 Historic 14 ET sensor open/high
77 Historic 15 IAT sensor voltage low
78 Historic 15 IAT sensor open/high
79 Historic 24 Front ignition coil open/low
80 Historic 25 Rear ignition coil open/low
81 Historic 24 Front ignition coil high/shorted
82 Historic 25 Rear ignition coil high/shorted
83 Historic 24 Front cylinder combustion intermittent
84 Historic 25 Rear cylinder combustion intermittent
85 Historic 23 Front injector open/low
86 Historic 32 Rear injector open/low
87 Historic 23 Front injector high
88 Historic 32 Rear injector high
89 Historic 16 Battery voltage low
90 Historic 16 Battery voltage high
91 Historic 43 VSS sensor low
92 Historic 43 VSS sensor high
93 Historic N/A Check engine light open/low NO CHECK ENGINE LAMP AT KEY ON or CHECK ENGINE LAMP ON CONTINUOUSLY
94 Historic N/A Check engine light high NO CHECK ENGINE LAMP AT KEY ON
95 Historic 35 Tachometer low
96 Historic 35 Tachometer high
97 Historic 25 Rear cylinder no combustion
98 Historic 24 Front cylinder no combustion
99 Historic 34 Loss of idle speed control
100 Historic 35 Accelerometer fault
101 Historic 34 Starter output high
102 Historic 25 Ignition enable output high
103 Historic 21 Left turn output fault
104 Historic 22 Right turn output fault
105 Historic 11 Battery voltage high
106 Historic 31 Alarm output low
107 Historic 32 Alarm output high
108 Historic 41 Ignition switch open/low

 

-----And from another website, for 2004 and newer bikes-------

The IM (instrument module) is capable of displaying DTC's (diagnostic trouble codes).
Speedometer Self Diagnostics: The speedometer is capable of displaying and clearing speedometer, tachometer, TSM/TSSM and ICM/ECM Diagnostic Trouble Codes (DTC).

1- Turn Ignition switch to OFF & Run/Stop switch is to Run.

2- Push odometer reset button in & hold.

3- Turn ignition switch to Ignition and release odometer reset button. Background lighting sould illuminate, speedometer needle should sweep its full range and indicator lamps (battery, security, low fuel, check engine and cruise) should illuminate. The word “diag” should then appear.

4 - Push the odometer reset button once and you will see the selection menu "PSSPt" with the first P flashing.

5 - Each letter represents an area of the diagnostics module. The module that is flashing is the one you are going to check. To move from one letter (module) to the next, you push the odometer reset button one time. (from P to S to SP to t and back to P, etc.)
P = ECM/ICM (Electronic Control Module [EFI] / Ignition Control Module [Carbureted])
S = TSM/TSSM (Turn Signal/ Turn Signal Security Module)
SP = speedometer
T = tachometer

6 - To get the DTC within an area of diagnostics, push and hold the odometer reset button in for 5 seconds and release. If there are any DTC’s the code will be displayed or the word “none” will appear if there are no DTC’s. Push the odometer reset button again to view additional codes if they exist.

7 - Record the codes.

8 - If DTC’s are not to be cleared, Press and release the odometer reset button. Part number of module will be displayed.
NOTE: To determine if a code is current or historic, clear the displayed code by pushing in and holding the odometer reset button ( longer than 5 seconds) until 'clear' comes up. Release the odometer reset button. Turn OFF the ignition switch. Run your bike and shut it down then recheck the DTC’s again by repeating steps 1 to 9. If the code is current it will reappear.

9 – Press and release the odometer reset button to continue to the next module.

10 – Turn Ignition switch to OFF.

--------------------------

DTC FAULT CONDITION MODULE

B0563 Battery Voltage High TSM/TSSM
B1004 Fuel Level Sending Unit Low Instruments
B1005 Fuel Level Sending Unit High/Open Instruments
B1006 Accessory Line Overvoltage Instruments
B1007 Ignition Line Overvoltage Instruments
B1008 Reset Switch Closed Instruments
B1131 Alarm Output Low TSM/TSSM
B1132 Alarm Output High TSM/TSSM
B1134 Starter Output High TSM/TSSM
B1135 Accelerometer Fault TSM/TSSM
B1151 Sidecar BAS Low TSM/TSSM
B1152 Sidecar BAS High TSM/TSSM
B1153 Sidecar BAS Out of Range TSM/TSSM
P0106 MAP Sensor Rate of Range Error Carb
P0107 Map Sensor Failed Open/Low Carb
P0107 Map Sensor Open/Low EFI
P0108 Map Sensor Failed High Carb
P0108 Map Sensor High EFI
P0112 IAT Sensor Voltage Low EFI
P0113 IAT Sensor Voltage Open/High EFI
P0117 ET Sensor Voltage Low EFI
P0118 ET Sensor Voltage Open/High EFI
P0122 TP Sensor Open/Low EFI
P0123 TP Sensor High EFI
P0261 Front Injector Open/Low EFI
P0262 Front Injector High EFI
P0263 Rear Injector Open/Low EFI
P0264 Rear Injector High EFI
P0373 CKP Sensor Intermittent Carb
P0373 CKP Sensor Intermittent EFI
P0374 CKP Sensor Not Detected Carb
P0374 CKP Sensor Synch Error EFI
P0501 VSS Low Carb
P0501 VSS Low EFI
P0502 VSS High/Open Carb
P0502 VSS High/Open EFI
P0505 Loss of Idle Sped Control EFI
P0562 Battery Voltage Low Carb
P0562 Battery Voltage Low EFI
P0563 Battery Voltage High Carb
P0563 Battery Voltage High EFI
P0602 Calibration Memory Error Carb
P0603 EEPROM Failure Carb
P0603 ECM EEPROM Error EFI
P0604 RAM Failure Carb
P0605 Program Memory Error Carb
P0605 ECM Flash Error EFI
P0607 Converter Error Carb
P1001 System Relay Coil Open/Low EFI
P1002 System relay Coil High/Shorted EFI
P1003 System relay Contacts Open EFI
P1004 System Relay Contacts Closed EFI
P1009 Incorrect Password Carb
P1009 Incorrect Password EFI
P1010 Missing Password Carb
P1010 Missing Password EFI
P1351 Front Ignition Open/Low Carb
P1351 Front Ignition Open/Low EFI
P1352 Front Ignition Coil High/Shorted Carb
P1352 Front Ignition Coil High/Shorted EFI
P1353 Front Cylinder No Combustion EFI
P1354 Rear Ignition Coil Open/Low Carb
P1354 Rear Ignition Coil Open/Low EFI
P1355 Rear Ignition Coil High/Shorted Carb
P1355 Rear Ignition Coil High/Shorted EFI
P1356 Rear Cylinder No Combustion EFI
P1357 Intermittent Secondary Front EFI
P1358 Intermittent Secondary Rear EFI
U1016 Loss of ICM/ECM Serial Data Instruments
U1016 Loss of ECM Serial Data, Vehicle Speed, Vehicle Inhibit Motion or Powertrain Security Status TSM/TSSM
U1064 Loss of TSM/TSSM Serial Data Carb
U1064 Loss of TSM/TSSM Serial Data EFI
U1064 Loss of TSM/TSSM Serial Data Instruments
U1097 Loss of Speedometer Serial data Carb
U1097 Loss of Speedometer Serial data EFI
U1097 Loss of Speedometer Serial data TSM/TSSM
U1255 Missing Message at Speedometer EFI
U1255 Serial Data Error/Missing Message EFI
U1255 Serial Data Error/Missing Message Instruments
U1255 Serial Data Error/Missing Message TSM/TSSM
U1300 Serial Data Low Carb
U1300 Serial Data Low EFI
U1300 Serial Data Low Instruments
U1300 Serial Data Low TSM/TSSM
U1301 Serial Data Open/High Carb
U1301 Serial Data Open/High EFI
U1301 Serial Data Open/High Instruments
U1301 Serial Data Open/High TSM/TSSM

2006 models with 02 sensors (Dynas)

P0131 Front 02 sensor lean for any length of time
P0151 Rear 02 sensor lean for any length of time
Above codes can also be set if 02 sensor fails.
-----------------------

AFR – Air Fuel Ratio

ATS – Air Temperature Sensor

BAS – Bank Angle Sensor

CCM – Cruise Control Module

CKP – Crank Position Sensor. The CKP generates an “AC signal” which is sent to the ECM where it is used to reference engine position (TDC) and speed. Home position established by taking readings off the 22 teeth on the alternator rotor.

DTC – Diagnostic Trouble Codes

ECM – Electronic Control Module. (The Computer) Computes the spark advance for proper ignition timing and fuel control based on sensor inputs (from CKP, MAP & TP sensors) and controls the low-voltage circuits for the ignition coils and injectors. The dwell time for the ignition coil is also calculated in the microprocessor and is dependent upon battery voltage. The programmed dwell feature gives adequate spark at all speeds.

ECT – Engine Coolant Temperature. Sensor also controls the cooling fan relay that provides 12 Vdc to the fans.

EFI – Electronic Fuel Injection

EFP – Electronic Fuel Pump

ET – Engine Temperature sensor

FI – Fuel Injectors

FPR – Fuel Pressure regulator

IAC – Idle Air Control actuator

IAT – Intake Air Temperature sensor

ISS – Ion Sensing System…detonation detection

MAP – manifold Absolute Pressure sensor. The MAP sensor monitors the intake manifold pressure (vacuum) and sends the information to the ECM. The EMC then adjusts the spark and fuel-timing advance curves for optimum performance.

TP – Throttle Position Sensor

TSM/TSSM (Turn Signal/ Turn Signal Security Module)

VE – Volume Efficiency

VSS – Vehicle Speed Sensor. Used as an input for idle speed control

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