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Table 4-1. Typical Scan Values
ITEM
VALUE
RPM
ET (temperature, °F)
ET (voltage)
IAT (temperature)
IAT (voltage)
TP (degrees)
TP (voltage)
INJ PW
Advance (degrees)
Battery (voltage)
Eng run
O2 (voltage)
*Depends on position of idle set screw
Table 4-2. Engine Starts Hard
SYMPTOM
Engine temperature circuit
Improper fuel pressure
Spark plugs and/or wires
Battery discharged
CMP sensor
Manifold leak
Ignition coil
Leaky injectors
Valve sticking
4-16
MIN.
MAX.
HOT
VALUE
IDLE
500
6900
1000*
3
558
varies
0.05
4.95
varies
varies
varies
varies
0.05
4.95
varies
0
85
6-6.5*
0.5
4.8
0.5-1.5*
varies
varies
varies
0
45
3-30°
(varies)
8
16
13.5
STOP
RUN
RUN
0
1
0.4-0.6
SOLUTION
4.19 TROUBLE CODE 14.
4.14 FUEL PRESSURE
TEST.
4.16 MISFIRE.
See charging system trouble-
shooting in Section 7.
4.28 TROUBLE CODE 56.
Spray water around induc-
tion module seals with engine
idling. If RPM changes,
change seals.
4.16 MISFIRE.
Test fuel injectors. See
4.41
THROTTLE BODY AND
INTAKE
MANIFOLD.
See Section 3
Table 4-3. Engine Performance Problems
SYMPTOM
Engine temperature circuit
CMP circuit
Spark plugs and/or wires
Improper fuel pressure
Improper TP sensor
adjustment
Manifold leak
Throttle plates not opening
fully
EVAP hose disconnected
from induction module (CA)
Water or dirt in fuel system
Table 4-4. Engine Exhaust Emits
Black Smoke or Fouls Plugs
SYMPTOM
Engine temperature circuit
Clogged air filter
Improper TP sensor
adjustment
Leaky injectors
Improper fuel pressure
SOLUTION
4.19 TROUBLE CODE 14.
4.28 TROUBLE CODE 56.
4.16 MISFIRE.
4.14 FUEL PRESSURE
TEST.
Calibrate sensor. See
4.36
THROTTLE POSITION
SENSOR.
Spray water around induc-
tion module seals with
engine idling. If RPM
changes, change seals.
See Section 1.
Connect.
Drain and refill with fresh
fuel.
SOLUTION
4.19 TROUBLE CODE 14.
See Section 1.
Calibrate sensor. See
4.36
THROTTLE POSITION
SENSOR.
Test fuel injectors. See
4.41
THROTTLE BODY AND
INTAKE
MANIFOLD.
4.14 FUEL PRESSURE
TEST.
2002 Buell X1: Fuel System
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