Fuel Injector & Resistor
- Using a stethoscope or a long screwdriver, make sure fuel injectors are making a clicking sound. If this operating noise cannot be heard from any one injector, disconnect control unit connector.
- Measure voltage across body and terminals No. 49, 50, 51, and 52 of control unit connector body side. See WIRING DIAGRAMS . Terminal voltage should be 12 volts.
- If voltage is below 10 volts in any circuit, check affected wire from battery to control unit for open or short. Repair as necessary. Disconnect each fuel injector connector.
- Measure resistance between terminals of each injector. Resistance for injectors should be 2-3 ohms. If resistance is greater than one milli-ohm, the affected circuit is broken. If zero ohms are present, replace injector.
- Measure voltage across injector power connector terminals No. 1 (Red/White), No. 2 (Red/Black), No. 3 (Red) and No. 4 (Red/Blue) of each connector and the body. Voltage across terminals should be 12 volts. If voltage is less than 10 volts, check wire from battery to injector for open or short.
- Disconnect connector from resistor. Measure resistance between terminals "W" and "B" of resistor. Resistance should be 5.8 6.5 ohms. If not within specification, replace resistor.
- Measure voltage across terminal No. 5 (Red) of resistor body connector and body. Voltage across terminal No. 5 should be 12 volts. If voltage is less than specified, check wiring, connectors, and fusible link for open or shorted wire.