Harley Davidson 2005 touring models. Service repair manual — page 51
HOME
s0448x9x
IAC
motor
[87A]
A
B
C
D
[87B]
[78B]
17
18
35
36
[78A]
ECM
Figure 5-39. IAC Circuit
Table 5-19. Wire Harness Connectors in Figure 5-39.
NO.
DESCRIPTION
TYPE
LOCATION
[78]
ECM
36-Place Packard
Under Right Side Cover
[87]
IAC
4-Place Packard
Below Fuel Tank (Right Side)
5-56
2005 Touring: Engine Management (EFI)
HOME
Test 5.16 (Part 1 of 2)
IDLE AIR CONTROL: DTC P0505
Remove air cleaner cover
and element. Is throttle
valve completely closed?
YES
NO
Monitor IAC pintle for 10 seconds after turning
Lubricate and adjust
ignition OFF. Does pintle extend and then retract
throttle cables.
during 10 second key OFF reset procedure?
1
YES
NO
Check intake manifold for leaks. See
Disconnect IAC and connect test lamp.
5.9 INTAKE LEAK TEST. Leaks
See Figure 5-36.
found?
Turn ignition switch to IGNITION for 2 seconds,
and then OFF for 10 seconds.
2
Check test lamp during key ON/OFF cycle.
YES
NO
Repair intake
Check fuel pressure.
Problem
Normal
leak.
See Section 5.15 FUEL
indicated.
behavior.
PRESSURE TEST.
Remove test lamp.
Repair faulty IAC
Connect Breakout Box to Connector [78B]
connection or IAC assembly.
leaving ECM disconnected. Check Terminal 31
for 12 volts. Battery voltage present?
YES
NO
Using DVOM, measure resistance
Go to Test 5.13.
between IAC connector [87B]
No ECM Power.
and Breakout Box.
IAC
WIRE COLOR
ECM
A
BE/GN
to 35
B
BN/R
to 36
C
BK/PK
to 18
3
D
BK/O
to 17
4
Does each wire measure 0.5 ohms or less?
YES
NO
Turn ignition ON. With ECM still
Repair poor connection
4
disconnected, check voltage on all
at Connectors [87B] or
four sockets of Connector [87B].
[78B], or repair open
Is voltage present?
wire in harness.
YES
NO
Clear codes using speedometer self diagnostics.
Locate and repair
See 5.6 SPEEDOMETER SELF DIAGNOSTICS.
short to voltage.
STOP
Go to Test 5.16
Confirm proper operation with no check engine
(Part 2 of 2).
lamp.
2005 Touring: Engine Management (EFI)
5-57
HOME
Test 5.16 (Part 2 of 2)
IDLE AIR CONTROL: DTC P0505
Continued from Test 5.16 (Part 1 of 2).
4
Turn ignition OFF. Measure resistance
between each socket of Connector [87B]
and ground.
Is resistance greater than 1 megohm
for all sockets?
YES
NO
Inspect ECM
Locate and
connections.
repair short to
Connections OK?
ground.
YES
NO
Replace ECM.
Repair ECM
Reprogram and learn
connections.
password.
5
Clear codes using speedometer self diagnostics.
See 5.6 SPEEDOMETER SELF DIAGNOSTICS.
Confirm proper operation with no check engine
lamp.
5-58
2005 Touring: Engine Management (EFI)
HOME
MISFIRE AT IDLE OR UNDER LOAD
5.17
GENERAL
d0273x8x
Misfire at Idle or Under Load
● Battery condition and connections may also cause mis-
fires. See BATTERY in the Touring Service Manual for
more information.
● Fuel system problems may also cause misfires. Consult
5.15 FUEL PRESSURE TEST and then see symptom
tables under 5.5 INITIAL DIAGNOSTIC CHECK: EFI.
● Mechanical problems with the engine may cause mis-
fires. See Section 3 of the Touring Service Manual for
Figure 5-40. Spark Tester
more information.
● Vehicle modifications including intake and exhaust may
cause misfires.
Table 5-20. Spark Plug Cables
DIAGNOSTICS
LOCATION
LENGTH
RESISTANCE
Front/Rear
20.2 inch (513 mm)
4975-11960
Diagnostic Notes
The reference numbers below correlate with the circled num-
3.
Perform spark plug cable resistance test.
bers on the Test 5.17 flow charts.
a. Remove spark plug cable from spark plug and igni-
tion coil. For best results, use a needle nose pliers
1WARNING
for removal/installation on coil. Gently grasp cable
Any open spark around gasoline or other combustibles
as close to terminals as possible.
may result in fire or explosion. Thoroughly wipe up any
spilt fuel and dispose of rags in a suitable manner. Gaso-
b. Using an ohmmeter, touch probes to terminals on
line is extremely flammable and highly explosive. Inade-
each end plug cable.
quate safety precautions could result in death or serious
injury.
c. Compare resistance values to Table 5-20. Replace
cables not meeting specifications. Reinstall and
1. Connect BREAKOUT BOX
(Part No. HD-43876)
repeat procedure on other spark plug cable.
between wire harness and ECM. See 5.7 BREAKOUT
BOX: EFI.
4.
If carbon tracking is evident on outside of coil towers,
2. See Figure
5-40. A SPARK TESTER (Part No. HD-
replace ignition coil and inspect spark plug cables.
26792) must be used to verify adequate secondary volt-
Cables must be clean and tight. Excessive cable resis-
age (25,000 volts) at the spark plug.
tance or faulty connections can cause coil damage.
NOTE
5.
This test can also be performed by substituting a known
Engine will not spark with both spark plugs removed. When
good coil for one causing the no spark condition. The coil
checking for spark, use SPARK TESTER (Part No. HD-
26792) with both plugs installed.
does not require full installation to be functional. Verify
faulty coil by performing resistance test. See IGNITION
a. Turn ignition key OFF.
COIL in the Touring Service Manual.
b. Remove spark plug cable from spark plug. Visually
check plug condition.
6.
Use HARNESS CONNECTOR TEST KIT (Part No. HD-
c. Attach cable to SPARK TESTER. Clip tester to cylin-
41404A), red pin probe and patch cord to relay and gray
der head bolt.
pin probe and patch cord to the coil connector [83B].
d. While cranking engine, watch for spark to jump
tester gap on leads.
e. Reinstall and repeat procedure on other spark plug
cable.
2005 Touring: Engine Management (EFI)
5-59
HOME
[62B]
f2332f8x
Y/GN
[78]
System
relay
BE/GY
GN/O
W/BK
[13A] [13B]
Fuel
System relay
4
GN/O
pump
O/GY
Y/GN
15 Amp
fuel pump
Inj. F
21
W/Y
fuse
[141B] [141A]
[84B]
[84A]
BK
Y/GN
All Except
FLHR/C/S
[83B]
[83A]
Inj. R
19
GN/GY
[85B]
[85A]
Ion sense
Coil
27
GY/BE
Coil R
11
Y/BE
Coil F
29
BE/O
40 Amp
Maxi Fuse
+
-
15 Amp
Battery
ECM fuse
R
Constant power
31
BE/GY
BK
Starter
Motor
Switch power
13
W/BK
GY
R/BK
Engine
15 Amp
stop
IGN fuse
Ignition
switch
switch
Power gnd.
10
BK
Power gnd.
28
BK
Figure 5-41. Ignition Coil Circuit
Table 5-21. Wire Harness Connectors in Figure 5-41.
NO.
DESCRIPTION
TYPE
LOCATION
[78]
ECM
36-Place Packard
Under Right Side Cover
[83]
Ignition Coil
4-Place Packard
Below Fuel Tank (Left Side)
5-60
2005 Touring: Engine Management (EFI)
HOME
Test 5.17 (Part 1 of 3)
MISFIRE AT IDLE OR UNDER LOAD
Is fuel contaminated?
YES
NO
Connect breakout box. Check for continuity
1
between terminal 10 of ECM and battery neg-
Drain and flush
ative and terminal 28 of ECM and battery neg-
tank. Refill with
ative. Resistance should be less than 1 ohm.
fresh fuel.
Is it?
YES
NO
Use spark tester to check cables.
Locate and repair poor
2
Did spark jump tester lead gap?
ground connection.
Did it?
YES
NO
Check for:
Check resistance of each spark plug
• Faulty, worn or cracked spark plug(s).
cable that did not fire the spark tester.
• Plug fouling due to engine
3
mechanical fault.
Also, check for faulty plug cable connections
• Faulty or poor connection at plug or coil.
and wires for carbon tracking.
Are spark plug cables OK?
YES
NO
Coils should be free
Replace
4
of carbon tracking.
faulty spark plug cables.
Are they?
YES
NO
Switch coil with unit
Replace
known to be good.
ignition coil.
2
Re-perform spark test.
Did spark jump gap
5
during engine cranking?
Go to Test 5.17
NO
STOP
(Part 2 of 3).
YES
Original ignition coil
is faulty. Replace.
2005 Touring: Engine Management (EFI)
5-61
HOME
Test 5.17 (Part 2 of 3)
MISFIRE AT IDLE OR UNDER LOAD
Continued from Test 5.17 (Part 1 of 3).
6
Measure resistance between relay
Terminal 87 and Socket A (Y/GN wire)
of Connector [83B]. Wiggle harness.
Is resistance continuously less than 0.5 ohms?
YES
NO
Reassemble coil and fuel tank. Measure
Find source of
voltage drop between battery (positive
intermittent and repair.
lead) and Terminal 87 (negative lead) on
system relay with engine running.
Is voltage drop less than 1.0 volt?
YES
NO
Problem is fuel related.
Repeat voltage drop test after moving
See symptoms under
negative lead to Terminal 30. With
Table 5-3. Engine Performance
engine running, is voltage drop less
Problems.
than 1.0 volt?
YES
NO
Replace
Repeat voltage drop test after
system relay.
moving negative lead to 15 amp
ECM fuse (BE/GY wire). With
engine running, is voltage drop less
than 1.0 volt?
YES
NO
Repair.
Repeat voltage drop test after
BE/GY wire.
moving negative lead to 15 amp
ECM fuse (R wire). With engine
running, is voltage drop less than
1.0 volt?
YES
NO
Replace 15 amp
ECM fuse.
STOP
Go to Test 5.17
(Part 3 of 3).
5-62
2005 Touring: Engine Management (EFI)
HOME
Test 5.17 (Part 3 of 3)
MISFIRE AT IDLE OR UNDER LOAD
Continued from Test 5.17 (Part 2 of 3).
Repeat voltage drop test after
moving negative lead to 40 amp maxi-fuse, ter-
minal B. With engine running, is voltage drop
less than 1.0 volt?
YES
NO
Check terminal
Repeat voltage drop test after
or repair wire.
moving negative lead to 40 amp maxi-fuse,
terminal A. With engine running, is voltage
drop less than 1.0 volt?
YES
NO
Check terminal
Repeat voltage drop test after
or replace
moving negative lead to starter
maxi-fuse.
motor battery terminal. With
engine running, is voltage drop
less than 1.0 volt?
YES
NO
Repair wire between
Repair or replace
maxi-fuse and starter
battery cable.
motor.
2005 Touring: Engine Management (EFI)
5-63
HOME
COMBUSTION ABSENT/INTERMITTENT
5.18
GENERAL
s0475x9x
Diagnostic Trouble Codes P1353, P1356,
P1357, P1358: No Combustion
See Figure 5-42. A feedback voltage signal in the secondary
ignition circuit detects the presence of combustion each time
a cylinder fires on ECM Pin 27. For diagnostic purposes, this
signal is only analyzed under load above 2000 rpm where it
may be easily measured. Failure to detect combustion at high
Pin B
speed and load means one of following conditions exist.
● Cylinder is truly misfiring.
● There is a lack of continuity in the ignition coil secondary
circuit.
Figure 5-42. Ignition Coil
Table 5-22. Code Description
DTC
DESCRIPTION
P1353
Front cylinder no combustion
b. Using an ohmmeter, touch probes to terminals on
each end plug wire.
P1356
Rear cylinder no combustion
P1357
Intermittent secondary front
c. Compare resistance values to Table 5-20. Replace
cables not meeting specifications. Reinstall and
P1358
Intermittent secondary rear
repeat procedure on other spark plug cable.
Table 5-23. Spark Plug Cables
LOCATION
LENGTH
RESISTANCE
DIAGNOSTICS
Front/Rear
20.2 inch (513 mm)
4975-11960
Diagnostic Notes
The reference number below correlates with the circled num-
bers on the Test 5.18 flow charts.
1.
Connect BREAKOUT BOX
(Part No. HD-43876)
between wire harness and ECM. See Section 5.7 BREA-
KOUT BOX: EFI.
2.
Spark plugs must be correct Harley-Davidson resistor
type specified for this model.
3.
Use HARNESS CONNECTOR TEST KIT (Part No. HD-
41404A), gray pin probes and patch cords.
4.
Perform spark plug cable resistance test.
a. Remove spark plug cable from spark plug and igni-
tion coil. For best results, use a needle nose pliers
for removal/installation on coil. Gently grasp cable
as close to terminals as possible.
5-64
2005 Touring: Engine Management (EFI)
HOME
f2208h8x
[62B]
System relay
Y/GN
[78A]
[78B]
BE/GY
GN/O
W/BK
[13A] [13B]
Fuel pump
O/GY
System relay
GN/O
Y/GN
15 amp
fuel pump
W/Y
fuse
[141B] [141A]
[84B] [84A]
BK
Y/GN
Power gnd.
Coil R
Y/BE
[85B] [85A]
GY/BE
Ignition
Switch power
Y/BE
coil
BE/O
ECM
W/BK
[83B] [83A]
Inj. R
GN/GY
BE/GY
+
-
15 amp
Inj. F
W/Y
Battery
ECM fuse
R
BK
40 Amp
R
R
Maxi Fuse
R/BK
12
12
BK
11
11
DCBA
10
10
[33B]
Ion sense
9
9
[33A]
Power gnd.
15 amp
8
8
Coil F
BE/O
7
7
IGN fuse
6
6
Ignition
5
5
GY
Constant power
switch
4
4
3
3
2
2
W/BK
1
1
12 11 10 9 8 7 6 5 4 3
21
[1B]
12 11 10 9 8 7 6 5 4 3
21
[1A]
[8B] [8A]
BK
12 11 10 9 8 7 6 5 4 3
2
1
[22A]
BK
12 11 10 9 8 7 6 5 4 3
2
1
[22B]
Engine stop
switch
Figure 5-43. Battery Voltage Circuit (FLTR, FLHT/C/U)
Table 5-24. Wire Harness Connectors in Figure 5-43.
NO.
DESCRIPTION
TYPE
LOCATION
[1]
Main to Interconnect Harness
12-Place Deutsch (Black)
Inner Fairing (Right Fairing Bracket)
[8]
Main to EFI Harness
12-Place Deutsch (Gray)
Under Right Side Cover
[22]
Right Handlebar Switches
12-Place Deutsch (Black)
Inner Fairing (Right Fairing Support Brace)
[33]
Ignition/Light Key Switch
4-Place Packard
Inner Fairing (Top Fork Bracket)
[78]
ECM
36-Place Packard
Under Right Side Cover
[83]
Ignition Coil
4-Place Packard
Below Fuel Tank (Left Side)
[84]
Front Injector
2-Place Packard
Below Fuel Tank (Left Side)
[85]
Rear Injector
2-Place Packard
Below Fuel Tank (Left Side)
2005 Touring: Engine Management (EFI)
5-65
HOME
[62B]
System relay
f2208m8x
Y/GN
[78A]
[78B]
BE/GY
GN/O
W/BK
Fuel pump
Y/GN
System relay
GN/O
Y/GN
15 amp
fuel pump
W/Y
fuse
[141B] [141A]
[84B] [84A]
BK
Y/GN
Power gnd.
Coil R
Y/BE
[85B] [85A]
GY/BE
Ignition
Switch power
Y/BE
coil
BE/O
ECM
W/BK
[83B] [83A]
BE/GY
Inj. R
GN/GY
15 amp
+
-
W/Y
ECM fuse
Inj. F
Battery
R
BK
R
40 Amp
R
R/BK
Maxi Fuse
12
12
BK
11
11
I B A
10
10
[33B]
Ion sense
9
9
[33A]
Power gnd.
8
8
15 amp
Coil F
BE/O
7
7
IGN fuse
6
6
Ignition
5
5
GY
Constant power
switch
4
4
3
3
2
2
W/BK
1
1
12 11 10 9 8 7
6543
2
1
[22A]
12 11 10 9 8 7
6543
2
1
[22B]
[8B] [8A]
12-Place on
FLHP Only
BK
Engine stop
BK
switch
Figure 5-44. Battery Voltage Circuit (FLHR/C/S)
Table 5-25. Wire Harness Connectors in Figure 5-44.
NO.
DESCRIPTION
TYPE
LOCATION
[8]
Main to EFI Harness
12-Place Deutsch (Gray)
Under Right Side Cover
[22]
Right Handlebar Switches
12-Place Deutsch (Black)
Inside Headlamp Nacelle
[33]
Ignition/Light Key Switch
3-Place Packard
Under Console
[78]
ECM
36-Place Packard
Under Right Side Cover
[83]
Ignition Coil
4-Place Packard
Below Fuel Tank (Left Side)
[84]
Front Injector
2-Place Packard
Below Fuel Tank (Left Side)
[85]
Rear Injector
2-Place Packard
Below Fuel Tank (Left Side)
5-66
2005 Touring: Engine Management (EFI)
HOME
Test 5.18 (Part 1 of 2)
COMBUSTION ABSENT: DTC P1353, P1356, P1357, P1358
Is vehicle
running properly?
YES
NO
Has vehicle run out
Check fuel pressure. See
of fuel recently?
Section 5.15 FUEL PRESSURE
TEST. Is fuel pressure 55-62
PSI (380-425 kPA)?
YES
NO
YES
NO
See Section 5.17
See Section
Clear codes, refill with fresh
MISFIRE AT IDLE
5.13 FUEL SYSTEM
fuel and restart. Does code
OR UNDER LOAD.
ELECTRICAL TEST.
return?
YES
NO
System
OK.
Check if spark plug terminal is fully
connected on spark plug.
YES
NO
Remove spark plug terminal from
Seat terminal
spark plug. Inspect cable and spark
on spark plug.
plug terminals for carbon tracking or
evidence of a loose terminal. Loose
terminal present?
YES
NO
Crimp spark plug terminal
slightly to improve connection
Clear codes using speedometer self diagnostics.
STOP
or replace spark plug cable.
See 5.6 SPEEDOMETER SELF DIAGNOSTICS.
Confirm proper operation with no check engine
lamp.
Go to Test 5.18
(Part 2 of 2).
2005 Touring: Engine Management (EFI)
5-67
HOME
Test 5.18 (Part 2 of 2)
COMBUSTION ABSENT: DTC P1353, P1356, P1357, P1358
Continued from Test 5.18 (Part 1 of 2).
1
Using Breakout Box, measure resistance between
spark plug center electrode and Breakout Box Terminal
27. Is resistance less than 60,000 ohms?
2
YES
NO
Replace spark plug.
Check continuity between coil
Condition still present?
3
Terminal B and Breakout Box
Terminal 27. Continuity present?
YES
NO
YES
NO
Replace spark plug
System
cable. Condition still
OK.
present?
Replace
Check spark plug cable resistance.
coil.
4
Resistance meet specifications?
YES
NO
YES
NO
Measure resistance between
System
Terminal A and B at coil.
OK.
Resistance should be greater
Replace spark
Replace spark
than 100k ohms.
plug.
plug cable.
Is it?
YES
NO
Replace ECM.
Replace coil and ECM.
Reprogram and learn
Reprogram and learn
password.
password.
Clear codes using speedometer self diagnostics.
See 5.6 SPEEDOMETER SELF DIAGNOSTICS.
Confirm proper operation with no check engine
lamp.
5-68
2005 Touring: Engine Management (EFI)
HOME
DTC P0107, P0108
5.19
GENERAL
f1939x9x
MAP Sensor
See Figure 5-45. The manifold absolute pressure sensor
(MAP sensor) is supplied 5 volts from the ECM (Pin 14) and
sends a signal back to the ECM (Pin 25). This signal varies in
accordance with engine vacuum and atmospheric barometric
pressure. Changes in barometric pressure are influenced by
weather and altitude.
Table 5-26. Code Description
DTC
DESCRIPTION
MAP Sensor
P0107
MAP sensor open/low
P0108
MAP sensor high
Figure 5-45. Induction Module (Top View)
DIAGNOSTICS
Diagnostic Notes
The reference numbers below correlate with the circled num-
bers on the Test 5.19 flow charts.
Diagnostic Tips
1.
Connect BREAKOUT BOX
(Part No. HD-43876)
● These codes will set if the MAP sensor signal is out of
between wire harness and ECM. See Section 5.7 BREA-
range. Code P0108 can only be detected with the engine
KOUT BOX: EFI.
running.
2.
Use HARNESS CONNECTOR TEST KIT (Part No. HD-
● MAP sensor output check. Using the VACUUM PUMP
41404A), gray pin probes and patch cords.
(Part No. HD-23738), apply a vacuum to the pressure
port of the MAP sensor. The signal voltage should lower
as the vacuum is applied.
● The MAP, TP and VSS sensors are connected to the
same reference line (+5V Vref). If the reference line goes
to ground or open, multiple codes will be set
(DTC
P0107, P0108, P0122, P0123).
2005 Touring: Engine Management (EFI)
5-69
HOME
f1743q9s
MAP
Sensor
[80A]
A
B
C
[80B]
A
B
C
To TP, ET &
IAT Sensors
To TP and
VSS sensors
[78B]
14
25
26
[78A]
ECM
Figure 5-46. MAP Sensor Circuit
Table 5-27. Wire Harness Connectors in Figure 5-46.
NO.
DESCRIPTION
TYPE
LOCATION
[78]
ECM
36-Place Packard
Under Right Side Cover
[80]
MAP Sensor
3-Place Packard
Top of Induction Module
5-70
2005 Touring: Engine Management (EFI)
HOME
Test 5.19 (Part 1 of 2)
MAP SENSOR: DTC P0107, P0108
Connect Breakout Box. With ignition ON,
1
measure voltage between terminal 25
and terminal 26 on Breakout Box.
With key ON, engine OFF, voltage must be
between 3.5 and 5.0 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 5.8 WIGGLE TEST
to check for intermittents.
STOP
Intermittents present?
Go to Test 5.19 (Part 2 of 2).
YES
NO
To identify the source of intermittents,
Replace MAP sensor. Clear codes and road
start with box marked by Bold Asterisk
test. Did check engine lamp illuminate and
under Test 5.19 (Part 2 of 2). Wiggle
set DTC P0107 or P0108?
harness while watching DVOM.
YES
NO
Install original MAP sensor.
System
Replace ECM (reprogram,
now OK.
relearn) and road test again
to verify.
At some point in the flow chart you
may be instructed to jump directly
to a 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.
Clear codes using speedometer self diagnostics.
See 5.6 SPEEDOMETER SELF DIAGNOSTICS.
Confirm proper operation with no check engine
lamp.
2005 Touring: Engine Management (EFI)
5-71
HOME
Test 5.19 (Part 2 of 2)
MAP SENSOR: DTC P0107, P0108
Continued from
Test 5.19 (Part 1 of 2).
Check the 5 volt reference supply at
2
the MAP sensor connector [80B]. With
ignition ON, measure voltage between
terminal C (R/W) and terminal A (BK/W).
Voltage approximately 5.0 volts?
YES
NO.
NO.
Greater
Less
than 6V.
than 4.5V.
Connect Breakout Box to connector [78B]
leaving ECM disconnected.
OPEN CHECK: Measure resistance
Locate short to 12 volts on R/W
Connect Breakout Box to connector [78B]
between MAP connector [80B]
wire in wire harness. Repair as
leaving ECM disconnected.
2
Terminal B and Breakout Box terminal 25.
necessary.
Check continuity between MAP connector
Resistance less than 1 ohm?
[80B] Terminal C and Breakout Box
2
terminal 14. Then measure continuity
between MAP connector [80B] Terminal A
and Breakout Box terminal 26.
Resistance less than 1 ohm?
YES
NO
SHORT CHECK: Measure
Locate and repair
2
resistance between MAP con-
open on V/W wire.
nector Terminal B and chassis
ground. Resistance greater
than 1 megohm?
YES
NO
Check resistance between
Repair
MAP connector [80B]
open wire.
Terminal C and
YES
NO
Breakout Box terminal 26.
Resistance greater than
1 megohm?
Replace MAP sensor. See
Locate and repair
Touring Service Manual.
grounded V/W wire.
YES
NO
Replace ECM.
Locate and repair
Reprogram and learn
short between
password.
R/W and BK/W
wires.
At some point in the flow chart you
may be instructed to jump directly
to a the box with the bold asterisk.
Disregard the asterisk (but not the
Clear codes using speedometer self diagnostics.
instruction box) if your normal pro-
See 5.6 SPEEDOMETER SELF DIAGNOSTICS.
gression through the chart brings
Confirm proper operation with no check engine
you to this location.
lamp.
5-72
2005 Touring: Engine Management (EFI)
HOME
DTC P0112, P0113
5.20
GENERAL
DIAGNOSTICS
IAT Sensor
Diagnostic Tips
The ECM supplies and monitors a voltage signal (terminal 7)
An intermittent may be caused by a poor connection, rubbed
to one side of the intake air temperature sensor (IAT sensor).
through wire insulation or a wire broken inside the insulation.
The other side of the IAT sensor is connected to a common
sensor ground, which is also connected to the ECM (terminal
Check the following conditions:
26).
● Poor connection: Inspect ECM and harness connector
The IAT sensor is a thermistor device, meaning that at a spe-
[78] for backed out terminals, improper mating, broken
cific temperature, it will have a specific resistance across its
locks, improperly formed or damaged terminals, poor ter-
terminals. As this resistance varies, so does the voltage on
minal-to-wire connection and damaged harness.
(terminal 7).
● At high temperatures, the resistance of the sensor is very
● Perform 5.8 WIGGLE TEST to locate intermittents: If
low, which effectively lowers the signal voltage on termi-
connections and harness check out OK, use a DVOM to
check the intake air temperature sensor voltage reading
nal 7.
while moving related connectors and wiring harness. If
● At low temperatures, the resistance is very high, allowing
the failure is induced, the intake air temperature sensor
the voltage to rise close to 5 volts.
voltage reading will change.
The ECM monitors this voltage to compensate for various
● Shifted sensor: Refer to Table 5-29. This table may be
operating conditions.
used to test the intake air temperature sensor at various
temperature levels in order to evaluate the possibility of a
shifted
(out-of-calibration) sensor which may result in
Table 5-28. Code Description
driveability problems.
DTC
DESCRIPTION
NOTE
P0112
IAT sensor voltage low
All voltage and resistance values are approximate (±20%).
Measure IAT sensor resistance between ECM Terminal 7 and
P0113
IAT sensor open/high
system ground (ECM Terminal 26).
Diagnostic Notes
Table 5-29. IAT Sensor Table
The reference numbers below correlate with the circled num-
TEMP °C
RESISTANCE
VOLTAGE
TEMP °F
bers on the Test 5.20 flow charts.
-20
29121
4.9
-4
1.
Connect BREAKOUT BOX (Part No. HD-43876) to EFI
wire harness only (leave ECM disconnected). See 5.7
-10
16599
4.8
14
BREAKOUT BOX: EFI.
0
9750
4.6
32
2.
Use HARNESS CONNECTOR TEST KIT (Part No. HD-
10
5970
4.3
50
41404A), gray pin probes and patch cords.
20
3747
4.0
68
3.
Use HARNESS CONNECTOR TEST KIT (Part No. HD-
25
3000
3.8
77
41404A), gray socket probes and patch cords.
30
2417
3.6
86
4.
Replace IAT sensor. See Touring Service Manual.
40
1598
3.1
104
50
1080
2.6
122
60
746
2.2
140
70
526
1.7
158
80
377
1.4
176
90
275
1.1
194
100
204
0.9
212
2005 Touring: Engine Management (EFI)
5-73
HOME
f1743r9s
IAT
Sensor
A
B
[89A]
[89B]
A
B
To TP, ET &
MAP Sensors
[78B]
7
26
[78A]
ECM
Figure 5-47. IAT Sensor Circuit
Table 5-30. Wire Harness Connectors in Figure 5-47.
NO.
DESCRIPTION
TYPE
LOCATION
[78]
ECM
36-Place Packard
Under Right Side Cover
[89]
IAT Sensor
2-Place Packard
Below Fuel Tank (Right Side)
5-74
2005 Touring: Engine Management (EFI)
HOME
Test 5.20 (Part 1 of 2)
IAT SENSOR: DTC P0112, P0113
Connect Breakout Box to connector [78B] leaving
ECM disconnected. With engine at room temperature
(60-90° F or 16-32° C), use a DVOM to measure
1
resistance across terminals 7 and 26 on Breakout
Box. If engine is warm, refer to Table 5-29.
Resistance between 2.0k ohms and 5.0k ohms at
room temperature?
YES
NO
Connect ECM to Breakout Box.
Perform 5.8 WIGGLE TEST to check for
STOP
intermittents. Intermittents present?
Go to Test 5.20 (Part 2 of 2).
YES
NO
While wiggling harness, perform
Disconnect IAT sensor connector [89].
steps marked by BOLD ASTER-
Turn ignition ON. Using a DVOM, mea-
ISKS under Test 5.20 (Part 2 of 2).
sure the voltage
Repair as necessary.
between ECM terminal 7 (positive) and
terminal 26 (negative) on Breakout Box.
Voltage approximately 5 volts?
YES
NO.
NO.
Less than
Greater than
4.7 volts.
5.3 volts.
Replace IAT sensor, clear codes and
road test. Did check engine lamp illu-
With IAT sensor disconnected,
Unplug ECM leaving Breakout Box con-
1
1
minate and set DTC P0112 or
disconnect ECM from breakout box.
nected at vehicle harness.
P0113?
Measure resistance between
Measure voltage between
Breakout Box terminal 7 and terminals
Breakout Box terminal 7 and terminals 10
10 or 28.
or 28.
Resistance less than 1 megohm?
Voltage 0 volts?
YES
NO
YES
NO
YES
NO
Install original IAT
System
Repair short to
Replace ECM.
Replace ECM.
Examine IAT sig-
sensor, replace ECM,
OK.
ground on
Reprogram and
Reprogram and
nal wire (Lt GN/Y)
perform password
Lt GN/Y wire.
learn password.
learn password.
for short to volt-
learning and road test.
age and repair.
At some point in the flow chart you
may be instructed to jump directly
to a the box with the bold asterisk.
Clear codes using speedometer self diagnostics.
Disregard the asterisk (but not the
See 5.6 SPEEDOMETER SELF DIAGNOSTICS.
instruction box) if your normal pro-
Confirm proper operation with no check engine
gression through the chart brings
lamp.
you to this location.
2005 Touring: Engine Management (EFI)
5-75
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