Suzuki DL650K5 - C21 Iat Sensor Circuit Malfunction

FI SYSTEM DIAGNOSIS 4-33
“C21” IAT SENSOR CIRCUIT MALFUNCTION
INSPECTION
Step 1
1) Lift and support the fuel tank. ("5-7)
2) Turn the ignition switch OFF.
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

1 and
ground.
6) If OK, then measure the voltage between Dg wire terminal

1
and B/Br wire terminal

2.
% IAT sensor voltage: 4.5 – 5.5 V
(

+ Dg –

- Ground)
(

+ Dg –

- B/Br)
! 09900-25008: Multi circuit tester set
' Tester knob indication: Voltage (()
Is the voltage OK?
DETECTED CONDITION POSSIBLE CAUSE
Output voltage is out of the specified range.
0.1 V Sensor voltage < 4.6 V
• IAT sensor circuit open or short.
• IAT sensor malfunction.
• ECM malfunction.
1
V
1
YES Go to Step 2
NO
• Loose or poor contacts on the ECM coupler.
• Open or short circuit in the Dg wire or B/Br wire.
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