Kawasaki J300 - Service manual > Oxygen Sensor - not activated (Service Code 17, Equipped Models)
Oxygen Sensor Removal/Installation
- Refer to the Oxygen Sensor Removal/Installation in the Electrical System chapter.
Oxygen Sensor Inspection
Storage Box (see Storage Box Removal in the Frame chapter)
Oxygen Sensor Lead Connector [A]
- Connect the measuring adapter [A] between the harness connector and
oxygen sensor lead connector.
Main Harness [B]
Oxygen Sensor [C]
Special Tool - Measuring Adapter: 57001-1700
- Connect a digital meter [D] to the measuring adapter leads.
Oxygen Sensor Output Voltage
Connections to Adapter:
Digital Meter (+) → R (sensor BK) lead
Digital Meter (-) → BK (sensor GY) lead
- Warm up the engine thoroughly until the radiator fan starts.
- Measure the output voltage with the connector joined.
Standard: DC 0.7 V or more (Rich: AF bellow 14.7)
DC 0.18 V or less (Lean: AF over 14.7)
- Turn the ignition switch off.
If the reading is out of the standard, remove the ECU and check the wiring for continuity between harness connectors.
- Disconnect the ECU and sensor connectors.
Wiring Continuity Inspection
ECU Connector [A] ←→
Oxygen Sensor Connector [B]
GY/W lead (ECU terminal 3) [C]
G/P lead (ECU terminal 4) [D]
If the wiring is good, replace the sensor.
If the reading is within the standard, check the ECU for its ground and power supply (see ECU Power Supply Inspection).
If the ground and power supply are good, replace the ECU (see ECU Removal/Installation).
Oxygen Sensor Circuit
- Engine Stop Switch
- Fuse Box
- Ignition Fuse 15 A
- Charging/ECU Fuse 30 A
- Ignition Switch
- Side Stand Switch
- Engine Ground
- Frame Ground 1
- ECU Relay
- Oxygen Sensor
This sensor has a weight [A] with two magnets inside, and sends a signal to the ECU. But when the motorcycle banks 65º or more to either side (in fact falls down), the weight turns and the signal changes. The ECU senses this change, and stops the fuel pump relay, the fuel injector and the ignition system.