Electrical connection for injector Fuel injector

M48 Tank

Cap for
shrader	Fuel
valve	rail

electrical connection for injector

Fuel injector

Figure 10.10

10.11.The shrader valve can be used for checking fuel pressure. Fuel pressure readings obtained at the shrader valve can help pin-down problems with the fuel pump or the fuel pressure regulator. See Figure 10.11.

Figure 10.11

10.12.Before any service is performed on the pressur- ized portion of the fuel system, the engine must be allowed to cool, and the pressure should be relieved.

10.13.To relieve pressure from the fuel system:

•Turn the key switch off.

•Remove the 10A in-line fuse that protects the fuel pump.

•Start the engine normally. It will run for only a few seconds.

•Turn the key switch off.

11.EFI CONTROLS

The Fuel injection system used by Kohler is an adapted version of the Bosch Motronic automotive sys- tem.

NOTE: Do not connect or disconnect any electri- cal components with the key switch in the “on” position. The resulting arc could cause immedi- ate and sever damage to the ECU.

NOTE: If using a circuit tester, use only a high impedance tester (eg. Thexton model 125). Conventional testers pass the current they are checking through a small incandescent bulb. In some cases, the bulb draws more power than the circuit in the computer, over-loading the cir- cuit and complicating the diagnostic process by inducing a circuit failure. High impedance testers do not actually pass much current, and the LED indicator will not draw enough power to

damage the circuitry.

See Figure 11.0.

Figure 11.0

11.1.The EFI engine has a throttle valve or “air valve” similar to that of a carburetor. There is no fuel mixed into the air at this point. The throttle valve only regulates the amount of air that enters the engine.

11.2.The throttle responds to the governor just like it would with a carburetor.

11.3.The computer (ECU) takes in information from various sensors, and decides how much fuel the engine should have to maintain a correct fuel/air mixture. The ECU then sends electrical pulses to the individual injectors, triggering them to spray fuel into the intake tract.

M48 specifications

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