Buell 2002 X1 Handbook page 256

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Code 15 Test (Part 1 of 2)
1
YES
Replace IAT sensor (4.32
OXYGEN SENSOR),
clear codes if Scana-
lyzer is available and
road test.
Did check engine lamp
come on and set only
YES
Install original IAT
sensor, replace
ECM and road test.
7720
At some point in the flow chart you may be instructed
to jump directly to the box marked by an asterisk. Dis-
regard the asterisk (but not the instruction box) if your
normal progression through the chart brings you to
this location.
Clear codes and confirm proper
operation with no check engine
lamp.
4-60
Connect Breakout Box to connector [11] leaving ECM disconnected. With
engine at room temperature (68-86°F), use a DVOM to measure resistance across
Pin 10 of [11] and Pin 7 of [11] on the Breakout Box.
Is the resistance between 23,670-37,170 ohms?
Connect ECM to Breakout Box. Check for
intermittents by performing
TEST. Intermittents present?
While wiggling harness to locate source of
intermittents, perform the steps under
15 Test (Part 2 of 2)
Bold Asterisks. Repair as necessary.
Less than
With IAT sensor disconnected, dis-
connect ECM connector [11]. Mea-
sure resistance between ECM
Pin 10 of [11] and Pins 2 and 11
of [10]. Is resistance less than 1
megaohm?
NO
System OK. Repair short to
ground on
7725
Lt. GN/Y wire.
YES
4.8 WIGGLE
YES
Code
marked by
7715
NO
4.7 volts
YES NO
Replace ECM. See
4.29 ELECTRONIC
CONTROL
7730
NO
STOP
Go to Code 15 Test
(Part 2 of 2).
NO
Disconnect IAT sensor connector. Turn
ignition switch ON. Using a DVOM,
measure the voltage between
ECM Pin 10 (+) and Pin 7 (-) of [11]
on Breakout Box.
Is the voltage approximately 5 volts?
NO
Greater than
5.3 volts.
Unplug ECM leaving Breakout Box
connected at vehicle harness.
Measure voltage between ECM
Pin 10 of [11] and Pin 2 of [10] on
Breakout Box.
Is the voltage 0 volts?
YES
Replace ECM. See
4.29 ELECTRONIC
MODULE. CONTROL MODULE.
7735
7740
Examine IAT signal
wire (Lt. GN/Y) for
short to 12 volts
and repair.
2002 Buell X1: Fuel System
NO
7745