XVS95CE Fault Code 43

Fault Code Nos.

Fault Code No.: 43 Diagnostic Code No.: 09 and 50

Item: Fuel system voltage: incorrect voltage supplied to the fuel injector and fuel pump.

Fail-Safe System: Able to start engine | Able to Drive Vehicle

Indicated: Fuel system voltage (battery voltage)
Approximately 12.0 VDC

Diagnostic Code No.: 09
Procedure: Set the engine stop switch to "o", and then compare the actually measured battery voltage with
the display value. (If the actually measured battery voltage is low, recharge the battery.)

Diagnostic Code No.: 50
Actuation: Actuates the relay unit five times at one-second intervals. Illuminates the engine trouble warning
light.

Procedure: Check that the relay unit is actuated five times by listening for the operating sound.

Probable Cause of Confirmation of Service
Item Malfunction and Check Maintenance Job Completion

Connection of relay unit coupler.

Check the locking condition
of the coupler.

Disconnect the coupler and
check the pins (bent or broken terminals and locking
condition of the pins).

Improperly connected.

Connect the coupler securely or replace the wire harness.

Start the engine and let it idle for approximately 5 seconds.

If the Fault code number is not displayed, the Service is finished.

If however, the Fault code number is displayed, then go to item 2.

Connection of ECU coupler.

Check the locking condition
of the coupler.

Disconnect the coupler and
check the pins (bent or broken terminals and locking
condition of the pins).

Improperly connected.

Connect the coupler securely or replace the wire harness.

Start the engine and let it idle for approximately 5 seconds.

If the Fault code number is not displayed, the Service is finished.

If however, the Fault code number is displayed, then go to item 3.

Wire harness continuity.

Open or short circuit.

Replace the wire harness.

Between relay unit coupler and ECU coupler.
(Red/Blue-Red/Blue)

Between starter relay coupler and relay unit coupler.
(Red/Black-Red/Black)

Between starter relay coupler and battery.
(Red-Red)

Start the engine and let it idle for approximately 5 seconds.

If the Fault code number is not displayed, the Service is finished.

If however, the Fault code number is displayed, then go to item 4.

Defective relay unit.

Execute the diagnostic
mode. (Code No. 50).

If there is No operating sound, replace the relay unit.

Start the engine and let it idle for approximately 5 seconds.

If the Fault code number is not displayed, the Service is finished.

If however, the Fault code number is displayed, then go to item 5.

Defective relay unit.

Execute the diagnostic
mode. (Code No. 09).

If the Fuel system voltage is below 3 VDC, replace the relay unit.

Start the engine and let it idle for approximately 5 seconds.

If the Fault code number is not displayed, the Service is finished.

If however, the Fault code number is displayed, then go to item 6.

Malfunction in ECU.

Replace the ECU.