C21" (P0110-H/L) Iat Sensor Circuit Malfunction - Suzuki GSX-R750 Service Manual

"C21" (P0110-H/L) IAT SENSOR CIRCUIT MALFUNCTION

DETECTED CONDITION
C21 Output voltage is not within the following
range.
0.15 V
P0110 Sensor voltage is higher than specified
H
value.
Sensor voltage is lower than specified
L
value.
IAT sensor
INSPECTION
Step 1 (When indicating C21:)
1) Turn the ignition switch OFF.
2) Lift and support the fuel tank. (5-3)
3) Check the IAT sensor coupler for loose or poor contacts.
If OK, then measure the IAT sensor voltage at the wire side
coupler.
4) Disconnect the coupler and turn the ignition switch ON.
5) Measure the voltage between Dg wire terminal A and
ground.
6) If OK, then measure the voltage between Dg wire terminal A
and B/Br wire terminal B.
 IAT sensor input voltage: 4.5 – 5.5 V
 09900-25008: Multi-circuit tester set
 Tester knob indication: Voltage ()
Is the voltage OK?
YES Go to Step 2.
• Loose or poor contacts on the ECM coupler
(terminal Q or S)
NO
• Open or short circuit in the Dg wire or B/Br wire
Sensor voltage < 4.85 V
(+ Dg – - Ground)
(+ Dg – - B/Br)
POSSIBLE CAUSE
• IAT sensor circuit open or short
• IAT sensor malfunction
• ECM malfunction
• IAT sensor circuit open or ground circuit open
• IAT sensor circuit shorted to ground
Dg
B/Br
1
1
FI SYSTEM DIAGNOSIS 4-53
ECM
IAT
E2
V