Kawasaki J300 - Service manual > Fuel Injector Power Supply Voltage Inspection

NOTE

• Be sure the battery is fully charged.

• Turn the ignition switch off.
• Remove the storage box (see Storage Box Removal in the Frame chapter).
• Disconnect the injector connector and connect the measuring adapter [A] between these connector.

  Main Harness [B]
  Fuel Injector [C]

Special Tool - Measuring Adapter: 57001-1700

• Connect a digital meter [D] to the adapter lead.

Fuel Injector Power Supply Voltage
 Connect the Adapter:
  Digital Meter (+) → R (main harness R/BK) lead
  Digital Meter (-) → Battery (-) Terminal

• Measure the power supply voltage with the engine stopped.
• Turn the engine stop switch to running position.
• Turn the ignition switch on.

Power Supply Voltage
 Standard: Battery Voltage for 3 seconds, and then 0 V

• Turn the ignition switch off.

  If the voltage is out of the standard, check the power supply wiring (see Fuel Injector Circuit).

  If the reading is within the standard, check the output voltage (see Fuel Injector Output Voltage Inspection).

Fuel Injector Output Voltage Inspection

NOTE

• Be sure the battery is fully charged.

• Turn the ignition switch off.
• Remove the ECU (see ECU Removal).
  • Do not disconnect the ECU connector.
• Using the needle adapter set and connect a digital meter [A] to the connector [B].

Special Tool - Needle Adapter Set: 57001-1457

Fuel Injector Output Voltage
 Connect the ECU Connector:
  Digital Meter (+) → W/R lead (ECU Terminal 16) [C]
  Digital Meter (-) →Battery (-) Terminal

• Measure the power supply voltage with the engine stopped with the connector jointed.
• Turn the engine stop switch to running position.
• Turn the ignition switch on.

Output Voltage
 Standard: Battery Voltage for 3 second, and then 0 V

• Turn the ignition switch off.

  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).

  If the reading is out of the standard, remove the ECU and check the wiring for continuity between main harness connectors.

  • Disconnect the ECU and injector connectors.

Wiring Continuity Inspection
 ECU Connector [A] ← → Fuel Injector Connector [B]
  W/R lead (ECU terminal 16) [C]

If the wiring good, check the ECU ground and power supply (see ECU Power Supply Inspection).

If the ground and power supply good, replace the ECU (see ECU Removal/Installation).

Fuel Injector Circuit

1. ECU
2. Engine Stop Switch
3. Fuse Box
4. Ignition Fuse 15 A
5. Charging/ECU Fuse 30 A
6. Ignition Switch
7. Side Stand Switch
8. Fuel Pump Relay
9. Battery
10. Engine Ground
11. Frame Ground 1
12. ECU Relay
13. Fuel Injector

See also: