Harley Davidson 2004 Touring Models. Service Manual — page 11
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Test 4.16 (Part 2 of 2)
IGNITION COIL: DTC P1351, P1352, P1354, P1355
Continued from Test 4.16 (Part 1 of 2).
Using Breakout Box, measure resistance between
ICM and coil terminals as follows.
DTC
COIL
BREAK-
TERMINAL
OUT BOX
TERMINAL
P1351/
C
6
P1352
(BE/O wire)
P1353/
A
1
7
P1354
(Y/BE wire)
3
Resistance less than 0.5 ohms?
YES
NO
Perform 5.8 WIGGLE TEST
Repair open wire
to check for intermittents.
or connection.
Intermittents present?
YES
NO
Repair
Check for continuity to ground.
intermittent.
Front coil codes: Check
Breakout Box Pin 6.
Rear coil codes: Check
Breakout Box Pin 7.
Continuity present?
YES
NO
Repair short
Check for voltage.
to ground.
Front coil codes: Check
Breakout Box Pin 6.
Rear coil codes: Check
Breakout Box Pin 7.
Voltage present?
YES
NO
Repair short
Replace ICM.
to voltage.
Reprogram and
learn password.
Clear codes using speedometer self diagnostics.
See 4.5 SPEEDOMETER SELF DIAGNOSTICS.
Confirm proper operation with no check engine
lamp.
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2004 Touring: Engine Management (Carbureted)
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DTC P0373, P0374
4.17
GENERAL
f2256x8x
Crank Position Sensor
See Figure 4-34. A DTC P0373, P0374 will set if the crank-
shaft position sensor (CKP) signal is weak or absent.
Table 4-25. Code Description
DTC
DESCRIPTION
P0373
Crankshaft position sensor intermittent
Crankshaft position sensor not detected or
P0374
cannot synchronize
Stator
Connector [46]
Crankshaft
DIAGNOSTICS
Position Sensor
Connector [79]
Under Voltage Regulator
Diagnostic Notes
Figure 4-34. Voltage Regulator (Left Side View)
1. Connect BREAKOUT BOX (Part No. HD-42682) to igni-
tion control module wire harness only, leaving ignition
control module disconnected. See 4.6 BREAKOUT BOX:
ICM.
2. One megohm 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.
2004 Touring: Engine Management (Carbureted)
4-49
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f2208w8x
Crankshaft
Position
Sensor
[79A]
[79B]
1
2
[10B]
[10A]
Ignition Control Module
Figure 4-35. Ignition Circuit
Table 4-26. Wire Harness Connectors in Figure 4-35.
NO.
DESCRIPTION
TYPE
LOCATION
[10]
Ignition Control Module
12-Place Deutsch
Under Right Side Cover
[79]
Crankshaft Position Sensor
2 - Place Mini-Deutsch
Bottom of Voltage Regulator
4-50
2004 Touring: Engine Management (Carbureted)
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Test 4.17
CRANK POSITION SENSOR: DTC P0373, P0374
Leaving ICM disconnected, connect Breakout
1
Box to harness only. Measure resistance
between Pins 8 and 5, and between Pins 9 and 5
on connector [10]. Is resistance more than 1
2
megohm?
YES
NO
Check for intermittent connection, pinched
Disconnect connector [79]. Leaving ICM
or damaged wires, and loose CKP sensor
disconnected, use Breakout Box to measure
fastener. Conditions found?
resistance between Pins 8 and 5 on connector
[10]. Also measure resistance between Pins 9
and 5 on connector [10]. Is there still continuity to
ground (less than 1 megohm resistance)?
YES
NO
Repair as
Connect DVOM to Terminals 8 and 9 at
YES
NO
necessary.
connector [10] on Breakout Box.
Set DVOM to AC volts and crank engine.
Does DVOM read 1 VAC minimum
Repair short to
Replace CKP
during cranking?
ground on R or
sensor.
BK wire between
connectors [10B]
and [79B].
YES
NO
With DVOM still connected, check for
Connect DVOM at Terminals 1
3
intermittents using 4.7 WIGGLE TEST.
and 2 of connector [79A].
Intermittents present?
DVOM should read 1 VAC
minimum while cranking.
Does it?
YES
NO
YES
NO
Repair as
Replace CKP
necessary.
sensor. Clear
Check for continuity between
Replace CKP
codes and retest.
Pin 8 [10B] and Pin 1 [79B]. Is
sensor.
Code P0373,
continuity present?
P0374 set?
4
YES
NO
YES
NO
Repair open on BK wire
Repair open on R wire
Reinstall CKP
System
between Pin 2 [79B] and Pin 9
between Pin 1 [79B] and Pin 8
sensor. Replace
OK.
on connector [10B].
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.
2004 Touring: Engine Management (Carbureted)
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DTC P0501, P0502
4.18
GENERAL
7951
Vehicle Speed Sensor
See Figure 4-36. The vehicle speed sensor is powered and
Speed
monitored by the ICM. The ICM processes the vehicle speed
Sensor
signal and transmits this signal to the TSM/TSSM and speed-
ometer through serial data.
NOTE
When the vehicle speed signal is greater than 0, the closed
loop idle speed control is inhibited.
Table 4-27. Code Description
DTC
DESCRIPTION
Engine Oil Fill
P0501
VSS sensor low
Plug/Dipstick
P0502
VSS sensor high/open
Figure 4-36. Vehicle Speed Sensor Location
DIAGNOSTICS
f2183x8x
Diagnostic Notes
The reference numbers below correlate with the circled num-
bers on the Test 4.18 flow charts.
1.
The speedometer has a built-in diagnostic mode. See
1
4.5 SPEEDOMETER SELF DIAGNOSTICS.
2.
Use HARNESS CONNECTOR TEST KIT (Part No. HD-
41404), black pin probe and patch cord.
3.
Connect BREAKOUT BOX
(Part No. HD-42682)
between wire harness and ICM. See 4.6 BREAKOUT
BOX: ICM.
4.
Jack up motorcycle and rotate rear wheel with transmis-
2
sion in neutral.
1. Vehicle Speed Sensor Connector [65]
2. P&A Security Siren Connector [142]
Figure 4-37. Electrical Bracket (Inboard Side)
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f2208x8x
Vehicle Speed
Sensor
R
R/W
A
A
W
B
B
W/GN
BK
C
C
BK/W
[65A]
[65B]
[10B]
3
10
[10A]
Ignition
Control
Module
Figure 4-38. Vehicle Speed Sensor Circuit
Table 4-28. Wire Harness Connectors in Figure 4-38.
NO.
DESCRIPTION
TYPE
LOCATION
[10]
Ignition Control Module
12-Place Deutsch
Under Right Side Cover
[65]
Vehicle Speed Sensor
3 - Place Deutsch
Under Right Side Cover (Behind Electrical Bracket)
2004 Touring: Engine Management (Carbureted)
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Test 4.18 (Part 1 of 2)
VEHICLE SPEED SENSOR: DTC P0501, P0502
Remove and inspect vehicle speed sensor. Inspect
for debris and clean if necessary. Place speedometer
into diagnostic mode and clear ICM trouble codes.
Connect all circuits and ride motorcycle for
1
approximately 1.0 mile (1.6 km). Check for newly
logged codes. Codes present?
YES
NO
Check for continuity between socket
System OK.
2
A of connector [65B] (R/W wire) and
ground. Continuity present?
YES
NO
Repair short to ground.
2
Check for continuity between socket A
of connector [65B] (R/W wire) and pin 3
[10] of breakout box. Continuity
3
present?
YES
NO
Check for continuity between socket C
Repair open on R/W wire
of connector [65B] (BK wire) and
between connectors [10B]
ground. Continuity present?
and [65B].
NO
YES
Repair open on BK wire
STOP
between connector [65B]
and ground.
Go to. Test 4.18
(Part 2 of 2)
Clear codes using speedometer self diagnostics.
See 4.5 SPEEDOMETER SELF DIAGNOSTICS.
Confirm proper operation with no check engine
lamp.
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Test 4.18 (Part 2 of 2)
VEHICLE SPEED SENSOR: DTC P0501, P0502
Continued from Test 4.18 (Part 1 of 2).
2
Check for continuity between socket B of connector
[65B] and Pin 10 [10] of breakout box. Continuity
3
present?
YES
NO
Check for voltage on W/GN wire of connector
[65B] while connected. Meter should read 4-6
Repair open on W/GN
wire between connectors
4
volts when gear tooth absent and 0-1 volts
[10B] and [65B].
when gear tooth is present. Does it?
YES
NO
Replace ICM. Reprogram
and learn password.
4-6 volts present.
4-6 volts present but no
fluctuation from 0-1 volts
Replace ICM. Reprogram
Replace vehicle
and learn password.
speed sensor.
2004 Touring: Engine Management (Carbureted)
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DTC P0602, P0603, P0604, P0605, P0607
4.19
GENERAL
DIAGNOSTICS
ICM Failure
DTC P0607 Test
All of the following codes indicate an internal failure which
1. Power down the vehicle.
requires replacement of the ignition control module. See the
2. Clear codes using speedometer self-diagnostics.
Touring Service Manual for replacement procedures.
3. Replace ICM if codes reappear.
● DTC P0602 - Calibration memory error
● DTC P0603 - EE PROM failure
● DTC P0604 - RAM failure
DTC P0602, P0603, P0604, P0605 Test
● DTC P0605 - Program memory error
1. Power down the vehicle.
● DTC P0607 - A to D converter error
2. Clear codes.
3. Using Digital Technician, reprogram ICM using the cor-
rect calibration. See your dealer.
4. Restart vehicle. If code reappears, replace ICM. Repro-
gram and perform password learn.
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DTC U1064
4.20
GENERAL
Loss of TSM/TSSM Serial Data
The serial data connector provides a means for the ICM and
TSM/TSSM to communicate their current status. When all
operating parameters on the serial data link are within specifi-
cations, a state of health message is sent between the com-
ponents. A DTC U1064 indicates that the TSM/TSSM is not
receiving this state of health message.
Table 4-29. Code Description
DTC
DESCRIPTION
U1064
Loss of TSM/TSSM serial data
Figure 4-39. TSM/TSSM
DIAGNOSTICS
6924
Diagnostic Notes
3
4
The reference numbers below correlate with the circled num-
bers on the Test 4.20 flow chart.
2
1. Connect BREAKOUT BOX (Part No. HD-42682) as fol-
lows:
1
a. Mate black socket housing on Breakout Box with
speedometer connector [39] using SPEEDOMETER
HARNESS ADAPTER (Part No. HD-46601).
1. Terminal 2: ground (BK)
b. Mate black pin housing on Breakout Box with speed-
2. Terminal 3: serial data (Lt GN/V)
ometer harness connector [39B] using SPEEDOM-
3. Terminal 4: power (GY)
ETER HARNESS ADAPTER (Part No. HD-46601).
4. Protective cap
c. Mate gray socket housing on Breakout Box with
TSM/TSSM connector [30A].
Figure 4-40. Data Link Connector
d. Mate gray pin housing on Breakout Box with har-
ness connector [30B].
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f2208z8x
[156B] [156A]
Main to Interconnect
6
6
Harness
5
5
4
4
3
3
GY
BK
2
2
BK
LtGN/V
1
1
LtGN/V
O
1
2
3
4 5 6 7 8 9 10 11 12
[30B]
BN/GY
1
2
3
4 5 6 7 8 9 10 11 12
[30A]
TSM/TSSM
BN/GY
[39B]
GY
BK
1
2
3
4 5 6 7 8 9 10 11 12
[39A]
1
2
3
4 5 6 7 8 9 10 11 12
1
2
3
4 5 6 7 8 9 10 11 12
[8B]
Speedometer
1
2
3
4 5 6 7 8 9 10 11 12
1
2
3
4 5 6 7 8 9 10 11 12
[8A]
[108B]
1
2
3
4 5 6 7 8 9 10 11 12
Ignition
[108A]
Tachometer
Harness
15A
[1B] [1A]
Accessory
Fuse
1
2
Main to Interconnect
3
[2A]
1
2
3
4 5 6 7 8 9 10 11 12
Harness
4
Data Link
[2B]
1
2
3
4 5 6 7 8 9 10 11 12
[91A]
Main to Interconnect
15A
Harness
Ignition
Fuse
12
15A
[10B]
Battery
12
[10A]
Ignition Control Module
Fuse
Figure 4-41. Serial Data Circuit (FLHT/C)
Table 4-30. Wire Harness Connectors in Figure 4-41.
NO.
DESCRIPTION
TYPE
LOCATION
[1]
Main to Interconnect Harness
12-Place Deutsch (Black)
Inner Fairing - Right Radio Support Bracket
[2]
Main to Interconnect Harness
12-Place Deutsch (Gray)
Inner Fairing - Right Fairing Support Brace
[8]
Ignition Harness
12-Place Deutsch
Under Right Side Cover
[10]
Ignition Control Module
12-Place Deutsch
Under Right Side Cover
Cavity in Crossmember at Rear of
[30]
Turn Signal/Security Module
12-Place Deutsch
Battery Box (Under Seat)
[39]
Speedometer
12-Place Packard
Inner Fairing (Back of Speedometer)
[91]
Data Link
4-Place Deutsch
Under Right Side Cover
[108]
Tachometer
12-Place Packard
Inner Fairing (Back of Tachometer)
[156]
Main to Interconnect Harness
6-Place Deutsch
Inner Fairing - Right Fairing Support Brace
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f2208y8x
BK
GY
LtGN/V
LtGN/V
BK
BN/GY
O
1
2
3
4
5 6 7 8 9 10 11 12
[30B]
1
2
3
4
5 6 7 8 9 10 11 12
[30A]
BN/GY
TSM/TSSM
BK
1
2
3
4 5 6 7 8 9 10
11 12
[39B]
1
2
3
4 5 6 7 8 9 10
11 12
[39A]
GY
Speedometer
1
2
3
4
5
6
7
8
9
10 11 12
[8B] Ignition
1
2
3
4
5
6
7
8
9
10 11 12
[8A] Harness
15A
Battery
Fuse
15A
Accessory
Fuse
1
2
3
4
Data Link
[91A]
15A
Ignition
Fuse
12
[10B]
[10A]
Ignition Control Module
12
Figure 4-42. Serial Data Circuit (FLHR/S)
Table 4-31. Wire Harness Connectors in Figure 4-42.
NO.
DESCRIPTION
TYPE
LOCATION
[8]
Ignition Harness
12-Place Deutsch
Under Right Side Cover
[10]
Ignition Control Module
12-Place Deutsch
Under Right Side Cover
Cavity in Crossmember at Rear of
[30]
Turn Signal/Security Module
12-Place Deutsch
Battery Box (Under Seat)
[39]
Speedometer
12-Place Packard
Under Console (Back of Speedometer)
[91]
Data Link
4-Place Deutsch
Under Right Side Cover
2004 Touring: Engine Management (Carbureted)
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Test 4.20
LOSS OF TSM/TSSM SERIAL DATA: DTC U1064
Can you read TSM/TSSM hardware P/N?
See 4.5 SPEEDOMETER SELF DIAGNOSTICS.
NO or “No Rsp”
YES
Install Breakout Box on speedometer.
Install Breakout Box on speedometer.
1
1
Check for continuity between terminal 3
While wiggling harness, check for continuity
(gray) and terminal 2 (black) of Breakout
between terminal 3 (gray) and terminal 2
Box
(black) of Breakout Box
Continuity present?
Continuity present?
YES
YES
NO
NO
Replace TSM/TSSM.
Repair open on
Clear trouble codes.
Repair intermittent
Learn password.
LtGN/V wire.
Test Ride. Does U1064
on LtGN/V wire.
return?
YES
NO
Replace TSM/TSSM.
No trouble found.
Perform password learn
procedure.
Clear codes using speedometer self diagnostics.
See 4.5 SPEEDOMETER SELF DIAGNOSTICS.
Confirm proper operation with no check engine
lamp.
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DTC U1097
4.21
GENERAL
f2191x8x
Loss of Speedometer Serial Data
The serial data connector provides a means for the speedom-
eter, ICM and TSM/TSSM to communicate their current sta-
tus. When all operating parameters on the serial data link are
within specifications, a state of health message is sent
between the components. A DTC U1097 indicates that the
speedometer is not capable of sending this state of health
message.
Table 4-32. Code Description
DTC
DESCRIPTION
Loss of all speedometer serial data
U1097
Ignition Control Module
(state of health)
Connector [10]
Figure 4-43. Electrical Bracket (Under Right Side Cover)
6924
DIAGNOSTICS
3
Diagnostic Notes
4
The reference numbers below correlate with the circled num-
bers on the 4.21 flow chart.
2
1
1.
Connect BREAKOUT BOX
(Part No. HD-42682)
between wire harness and speedometer using SPEED-
OMETER HARNESS ADAPTER (Part No. HD-46601).
See 2.5 BREAKOUT BOX: SPEEDOMETER.
1. Terminal 2: ground (BK)
2. Terminal 3: serial data (Lt GN/V)
2.
Connect BREAKOUT BOX (Part No. HD-42682) (black)
3. Terminal 4: power (GY)
as follows:
4. Protective cap
a. Mate black socket housing on Breakout Box with
Figure 4-44. Data Link Connector
speedometer connector [39A] (at the back of the
speedometer) using INSTRUMENT HARNESS
ADAPTERS (Part No. HD-46601).
b. Mate black pin housing on Breakout Box with wire
harness connector [39B] using INSTRUMENT HAR-
NESS ADAPTERS (Part No. HD-46601).
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f2208z8x
[156B] [156A]
Main to Interconnect
6
6
Harness
5
5
4
4
3
3
GY
BK
2
2
BK
LtGN/V
1
1
LtGN/V
O
1
2
3
4 5 6 7 8 9 10 11 12
[30B]
BN/GY
1
2
3
4 5 6 7 8 9 10 11 12
[30A]
TSM/TSSM
BN/GY
[39B]
GY
BK
1
2
3
4 5 6 7 8 9 10 11 12
1
2
3
4 5 6 7 8 9 10 11 12
[39A]
1
2
3
4 5 6 7 8 9 10 11 12
[8B]
Speedometer
1
2
3
4 5 6 7 8 9 10 11 12
1
2
3
4 5 6 7 8 9 10 11 12
[8A]
[108B]
1
2
3
4 5 6 7 8 9 10 11 12
Ignition
[108A]
Tachometer
Harness
15A
[1B] [1A]
Accessory
Fuse
1
2
Main to Interconnect
3
[2A]
1
2
3
4 5 6 7 8 9 10 11 12
Harness
4
Data Link
[2B]
1
2
3
4 5 6 7 8 9 10 11 12
[91A]
Main to Interconnect
15A
Harness
Ignition
Fuse
12
15A
[10B]
Battery
12
[10A]
Ignition Control Module
Fuse
Figure 4-45. Serial Data Circuit (FLHT/C)
Table 4-33. Wire Harness Connectors in Figure 4-45.
NO.
DESCRIPTION
TYPE
LOCATION
[1]
Main to Interconnect Harness
12-Place Deutsch (Black)
Inner Fairing - Right Radio Support Bracket
[2]
Main to Interconnect Harness
12-Place Deutsch (Gray)
Inner Fairing - Right Fairing Support Brace
[8]
Ignition Harness
12-Place Deutsch
Under Right Side Cover
[10]
Ignition Control Module
12-Place Deutsch
Under Right Side Cover
Cavity in Crossmember at Rear of
[30]
Turn Signal/Security Module
12-Place Deutsch
Battery Box (Under Seat)
[39]
Speedometer
12-Place Packard
Inner Fairing (Back of Speedometer)
[91]
Data Link
4-Place Deutsch
Under Right Side Cover
[108]
Tachometer
12-Place Packard
Inner Fairing (Back of Tachometer)
[156]
Main to Interconnect Harness
6-Place Deutsch
Inner Fairing - Right Fairing Support Brace
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f2208y8x
BK
GY
LtGN/V
LtGN/V
BK
BN/GY
O
1
2
3
4
5 6 7 8 9 10 11 12
[30B]
1
2
3
4
5 6 7 8 9 10 11 12
[30A]
BN/GY
TSM/TSSM
BK
1
2
3
4 5 6 7 8 9 10
11 12
[39B]
1
2
3
4 5 6 7 8 9 10
11 12
[39A]
GY
Speedometer
1
2
3
4
5
6
7
8
9
10 11 12
[8B] Ignition
1
2
3
4
5
6
7
8
9
10 11 12
[8A] Harness
15A
Battery
Fuse
15A
Accessory
Fuse
1
2
3
4
Data Link
[91A]
15A
Ignition
Fuse
12
[10B]
[10A]
Ignition Control Module
12
Figure 4-46. Serial Data Circuit (FLHR/S)
Table 4-34. Wire Harness Connectors in Figure 4-46.
NO.
DESCRIPTION
TYPE
LOCATION
[8]
Ignition Harness
12-Place Deutsch
Under Right Side Cover
[10]
Ignition Control Module
12-Place Deutsch
Under Right Side Cover
Cavity in Crossmember at Rear of
[30]
Turn Signal/Security Module
12-Place Deutsch
Battery Box (Under Seat)
[39]
Speedometer
12-Place Packard
Under Console (Back of Speedometer)
[91]
Data Link
4-Place Deutsch
Under Right Side Cover
2004 Touring: Engine Management (Carbureted)
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Test 4.21
LOSS OF SPEEDOMETER SERIAL DATA:
DTC U1097
Can you read ECM/ICM hardware part number?
See 4.5 SPEEDOMETER SELF DIAGNOSTICS.
YES
NO or “No Rsp”
Install Breakout Box on speedometer.
Install Breakout Box on speedometer. Check conti-
1
1
While wiggling harness, check continuity
nuity between terminal 2 (black) of Breakout Box
between terminal 2 (black) of Breakout
and terminal 12 of connector [10B].
Box and terminal 12 of connector [10B].
Continuity present?
2
2
Continuity present?
YES
NO
YES
NO
Repair open on
Replace speedometer.
Lt GN/V wire.
Repair intermittent
Clear codes. Test ride.
on LtGN/V wire.
Does DTC U1097
return?
Clear codes using speedometer self diagnostics.
YES
NO
See 4.5 SPEEDOMETER SELF DIAGNOSTICS.
Confirm proper operation with no check engine
lamp.
Replace ICM.
No trouble found.
Reprogram and learn
password.
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SPECIFICATIONS
5.1
System Fuse Block (Under Left Side Cover)
IGNITION
DATA
8
0°-45° BTDC (range)
FLHR/C/S
Spark timing advance
12° BTDC@1000 RPM
9
10
Idle speed
990 ± 50 RPM
5
Spark plug size
12 mm
11
0.038-0.043 in
Spark plug gap
0.97-1.09 mm
Harley-Davidson
4
Spark plug type
No. 6R12 (no substitute)
12
Ignition coil primary
0.3-0.5 ohms
resistance
f2210x8x
3
1
2
Ignition coil secondary
2500-3500 ohms
resistance
8
7
FLTR, FLHT/C/U
9
6
Rating
10
Circuit
Color
(Amperes)
5
11
System Fuses
Maxi-Fuse
40
Orange
Headlamp
15
Blue
4
Ignition
15
Blue
Lighting
15
Blue
f2204x8x
2
3
Instruments
15
Blue
1
Brakes/Cruise
15
Blue
1.
Headlamp
7.
Radio Power
2.
Ignition
8.
Accessory
Radio Memory
15
Blue
3.
Lighting
9.
Battery
Radio Power
10
Red
4.
Instruments
10.
Brake Light Relay
5.
Brakes/Cruise
11.
P&A
Accessory
15
Blue
6.
Radio Memory
12.
Starter Relay
Battery
15
Blue
EFI Fuse Block (Under Right Side Cover)
P & A
15
Blue
EFI Fuses
EFI System
Relay
Fuel Pump
15
Blue
Spare
ECM Power
15
Blue
Fuel Pump
ECM Power
f2223x9x
Figure 5-1. Fuse Locations
2004 Touring: Engine Management (EFI)
5-1
HOME
NOTES
5-2
2004 Touring: Engine Management (EFI)
HOME
EFI SYSTEM
5.2
The bank angle sensor is within the TSM/TSSM. If the vehicle
GENERAL
lean angle exceeds 45 degrees for one second, the fuel
pump is shut off. Once the sensor is tripped, the motorcycle
The engine management system consists of the following
must be uprighted, turned off and then on again before the
components:
engine can be restarted. This is communicated across the
data bus.
● Electronic control module (ECM).
Front and rear coils fire each spark plug independently (one
● Crank position sensor (CKP).
cylinder at a time - no wasted spark). The coil also has an
● Manifold absolute pressure sensor (MAP).
extra terminal to monitor current on the coil secondary circuit.
This is used for knock detection and combustion diagnostics.
● Intake air temperature sensor (IAT).
The ignition system gives a spark near top dead center for
● Engine temperature sensor (ET).
starting. At RPM and loads above this, the system gives a
spark advance that varies between 0° and 50°.
● Idle air control (IAC).
The IAT, ET and TP sensors are used to provide information
● Throttle position sensor (TP).
to the ECM to fine tune spark and fuel delivery. The VSS is
● Vehicle speed sensor (VSS).
used as an input for idle speed control.
● Turn signal module (TSM) or optional, factory-installed
turn signal security module (TSSM). This includes an
TROUBLESHOOTING
integrated bank angle sensor (BAS).
● Ignition coil.
See the diagnostic charts that follow for troubleshooting infor-
mation.
The ECM is mounted under the electrical caddie cover (left
side of vehicle). It computes the spark advance for proper
ignition timing based on sensor inputs (from CKP, MAP and
TP sensor) and regulates the low-voltage circuits between
battery and ignition coil.
The ECM contains all of the solid state components used in
the ignition system. The dwell time for the ignition coil is also
calculated in the microprocessor and is dependent upon bat-
tery voltage. The programmed dwell is an added feature to
give adequate spark at all speeds. (The ECM has added pro-
tection against transient voltages, continuous reverse voltage
protection, and damage due to jump starts.) The ECM is fully
enclosed to protect it from vibration, dust, water or oil. This
unit is a non-repairable item. If it fails, it must be replaced.
The crank position sensor (CKP) is located in the front left
side of the crankcase. The CKP generates an AC signal
which is sent to the ECM where it is used to reference engine
position (TDC) and speed. It functions by taking readings off
the 30 teeth on the left side flywheel (two teeth are missing to
establish a reference point).
The MAP sensor is located on top of the intake manifold. The
MAP sensor monitors the intake manifold pressure (vacuum)
and sends the information to the ECM where the module
adjusts the spark and fuel timing advance curve for optimum
performance.
2004 Touring: Engine Management (EFI)
5-3
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