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ELECTRICAL COMPONENTS
CHECKING THE INTAKE AIR
TEMPERATURE SENSOR
1. Remove:
• Intake air temperature sensor (from the air
filter case.)
• Handle the intake air temperature sensor
with special care.
• Never subject the intake air temperature
sensor to strong shocks. If the intake air
temperature sensor is dropped, replace it.
2. Check:
• Intake air temperature sensor resistance
3. Connect:
• Tester
Tester (+) lead → Brown/White lead "1"
Tester (-) lead → Black/Blue lead (wire har-
ness color) "2"
Out of specification → Replace.
CHECKING THE ATMOSPHERIC
PRESSURE SENSOR
1. Check:
• Atmospheric pressure sensor output voltage
2. Connect:
• Test harness S- pressure sensor (3P) "1"
• Tester
Tester (+) lead → Pink lead (wire harness
color)
Tester (-) lead → Black/Blue lead (wire har-
ness color)
3. Connect the FI diagnostic tool sub-wire har-
ness to a battery, and then set the switch on
the harness to "ON".
When checking the atmospheric pressure
sensor, do not start the engine.
4. Measure the atmospheric pressure sensor
output voltage.
Out of specification → Replace.
CHECKING THE RECTIFIER/REGULATOR
1. Connect:
• Connect the tester to the coupler for con-
necting optional part
Tester (+) lead → Red lead "1"
Tester (-) lead → Black/White lead "2"
2. Start the engine.
3. Check:
• Rectifier/regulato output voltage
Out of specification → Replace.
4. Stop the engine.
Intake air temper-
ature sensor resis-
tance
Tester selector po-
sition
5.4–6.6 kΩ (0 ° C,
32 °F)
kΩ×1
290–390 Ω (80
°C, 176 °F)
Ω×100
Test harness S–pressure sensor
(3P):
YU-03207/90890-03207
Br/WB/L
Output voltage
Tester selector po-
sition
3.4 — 3.8 V DCV
Output voltage
Tester selector po-
sition
14.1–14.9 V DCV
Lg
R
B/W