Suzki Burgman AN400. Manual - part 40

4-42 FI SYSTEM

“C44” HO2 SENSOR (HO2S) CIRCUIT MALFUNCTION (E-02, 19, 54)

INSPECTION
Step 1
1) Remove the foot board. (

7-19)

2) Turn the ignition switch OFF.
3) Check the HO2 sensor coupler for loose or poor contacts.
4) Insert the copper wires to the HO2 sensor lead wire coupler.

5) Warm up the engine enough.
6) Measure the HO2 sensor output voltage at the coupler

(between B/G and Y/W wires) when idling condition.

7) Also, measure the HO2 sensor output voltage while

holding the engine speed at 3 000 r/min.

HO2 sensor output voltage at idle speed:

0.4 V and less (

B/G –

Y/W)

HO2 sensor output voltage at 3 000 r/min:

0.6 V and more (

B/G –

Y/W)

09900-25008: Multi circuit tester set

Tester knob indication: Voltage (

)

Is the voltage OK?

DETECTED CONDITION

POSSIBLE CAUSE

During O2 feedback control, O2 sensor voltage is
higher than the specification or lower than the speci-
fication.
(Without the above range.)
The heater circuit disconnection is detected during
engine operation, or no electrical power is supplied
from battery.

• HO2 sensor or its circuit open or short.
• Fuel system malfunction.
• ECM malfunction.

YES

Go to Step 2

Replace the HO2 sensor with a new one.

FI SYSTEM 4-43

Step 2
1) Turn the ignition switch OFF.
2) Turn the ignition switch ON and measure the heater

voltage between O/W wire (ECM side) and ground.

3) If the tester voltage indicates the battery voltage for few

seconds, it is good condition.

Heater voltage: Battery voltage

(O/W – Ground)

NOTE:
Battery voltage can be detected only during few seconds after
ignition switch is turned ON.

09900-25008: Multi circuit tester set

Tester knob indication: Voltage (

)

Is the voltage OK?

Step 3
1) Turn the ignition switch OFF.
2) Disconnect the HO2 sensor coupler.
3) Check the resistance between the terminals (White –

White) of the HO2 sensor.

HO2 heater resistance: 11.5 – 14.5

Ω

(at 23 °C/73.4 °F)

(White – White)

NOTE:
* Temperature of the sensor affects resistance value largely.
* Make sure that the sensor heater is at correct temperature.

09900-25008: Multi circuit tester set

Tester knob indication: Resistance (

Ω

)

Is the resistance OK?

YES

Go to Step 3

Replace the HO2 sensor with a new one.

YES

• Black, Gray or White wire open or shorted to

ground, or poor

connection.

• If wire and connection are OK, intermittent trou-

ble or faulty ECM.

• Recheck each terminal and wire harness for

open circuit and poor connection.

Replace the HO2 sensor with a new one.

ECM Coupler

4-44 FI SYSTEM

SENSORS

CKP SENSOR INSPECTION
The crankshaft position sensor is installed in the generator
cover. (

4-23)

IAP SENSOR INSPECTION
The intake air pressure sensor is installed at the front side of the
air cleaner case. (

4-25)

TP SENSOR INSPECTION
The throttle position sensor is installed at the right side of the
throttle body. (

4-28)

TPS SETTING PROCEDURE (

5-21)

ECT SENSOR INSPECTION
The engine coolant temperature sensor is installed on the cylin-
der head. (

4-31)

(

ECT sensor : 18 N·m (1.8 kgf-m, 13.0 lb-ft)

IAT SENSOR INSPECTION
The intake air temperature sensor is installed beneath the air
chamber. (

4-33)

(

IAT sensor : 3 N·m (0.3 kgf-m, 2.0 lb-ft)

FI SYSTEM 4-45

TO SENSOR INSPECTION
The tip over sensor is installed under the combination meter.
(

4-35)

NOTE:
When installing the TO sensor, bring the “UPPER” letter to the
top.

HO2 SENSOR (E-02, 19)

• The heated oxygen sensor is installed on the exhaust pipe.

(

4-42)

)

(

HO2 SENSOR: 47.5 N·m (4.75 kgf-m, 34.3 lb-ft)

Do not remove the HO2 sensor while it is hot.

* Be careful not to expose it to excessive shock.

Do not use an impact wrench while removing or
installing the HO2 sensor unit.

* Be careful not to twist or damage the sensor lead

wire.

* Do not apply oil or other materials to the sensor air

hole.

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