Trouble Code 15 - Buell Ulysses 2006 Service Manual

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TROUBLE CODE 15

GENERAL
Intake Air Temperature Sensor
See Figure 4-38. The ECM supplies and monitors a signal at
Pin 10 of [11] to one side of the intake air temperature sensor
(IAT sensor). The other side of the IAT sensor is connected to
a common sensor ground, which is also connected to the
ECM (Pin 7 of [11]).
8380
Figure 4-38. IAT Sensor
Refer to Table 4-22. The IAT sensor is a thermistor device,
meaning that at a specific temperature, it will have a specific
resistance across its terminals. As this resistance varies, so
does the supplied voltage (Pin 10).
At high temperatures, the resistance of the sensor is very
low. This effectively lowers the signal voltage on Pin 10.
At low temperatures, the resistance is very high, allowing
the voltage to rise close to the supplied voltage of 5 volts.
The ECM monitors this voltage to compensate for various
operating conditions.
DIAGNOSTICS
Diagnostic Tips
An intermittent may be caused by a poor connection, rubbed
through wire insulation or a wire broken inside the insulation.
Check for the following conditions:
Poor connection. Inspect ECM harness connector for
backed out terminals, improper mating, broken locks
improperly formed or damaged terminals, poor terminal-
to-wire connection and damaged harness.
Perform 4.7 WIGGLE TEST
connections and harness check out OK, check intake air
temperature reading while moving related connectors
and wiring harness. If the failure is induced, the IAT sen-
sor display will change.
4-56 2006 Buell Ulysses: Fuel System
to locate intermittents. If
Shifted sensor. The temperature-to-resistance values
table may be used to test the IAT sensor at various tem-
perature levels in order to evaluate the possibility of a
shifted (out-of-calibration) sensor which may result in
driveability problems.
Diagnostic Notes
The reference numbers below correlate with the circled num-
bers on the Code 15 flow charts.
1. Connect BREAKOUT BOX (Part No. HD-42682) to EFI
harness only (leave ECM disconnected). See
KOUT BOX.
2. Use HARNESS CONNECTOR TEST KIT (Part No. HD-
41404), gray socket probes and patch cord.
3. Use HARNESS CONNECTOR TEST KIT (Part No. HD-
41404), gray pin probe and patch cord.
Table 4-22. Intake Air Temperature
Sensor Specifications
VOLTS RESISTANCE
0.49 1086
0.68 1561
0.86 2077
1.13 2920
1.40 3889
2.25 8149
3.09 16,178
3.52 23,670
3.94 37,170
4.24 55,359
4.53 96,383
4.68 146,250
4.83 284,118
NOTE
All voltage and resistance values are approximate (+/- 20%).
Intake air temperature sensor is measured between Terminal
10 of [11] and system ground (Terminals 2 and 11 of [10]).
4.19
4.6 BREA-
TEMP °C TEMP °F
125 257
113 235
100 212
90 194
80 176
60 140
40 104
30 86
20 68
10 50
0 32
-10 14
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