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Injector Circuit

  1. Connect a non-powered 12-volt test lamp between pins 11 and 3 of ECA plug J2. Crank engine and note results. Then connect test lamp between pins 11 and 4 of ECA plug J2.
  2. If test lamp does not glow on 1 or both tests, verify that battery voltage is recorded at pin 11 of plug J2. If voltage is not present, repair wire or replace battery. If voltage is present, replace ECA. If test lamp glows brightly on 1 or both tests, check circuits 95 (Tan wire with Purple dot) and 96 (Tan wire with Orange dot) to injectors. If test lamp glows dimly on both tests, circuits are okay. Continue test.
  3. Remove test lamp and fuel pump relay. Using a DVOM, measure voltage between same pins tested in step 1) while cranking engine. If difference between voltage readings is more than 1 volt, disconnect ECA plugs and inspect for corroded or damaged pins. Reconnect plugs and retest. If voltage readings still vary more than 1 volt, replace ECA. If voltage difference is less than 1 volt, circuits are okay. Continue test.
  4. Reconnect fuel pump relay. Turn ignition off. Disconnect electrical connectors at injectors 2, 3, and 4. Set DVOM on 20-ohm range and measure resistance between pins 3 and 11 of ECA plug J2 (injector 1). Record reading. Disconnect electrical connector at injector 1 and reconnect connector at injector 2. Measure resistance between same pins again. Record reading.
  5. Disconnect electrical connector at injector 2 and reconnect connector at injector 3. Measure resistance between pins 4 and 11 of plug J2. Record reading. Disconnect electrical connector at injector 3 and reconnect connector at injector 4. Measure resistance between same pins again. Record reading.
  6. If all 4 readings in steps 4) and 5) are not 2.0-3.5 ohms, check wiring harness on injector(s) and repair as required. If wiring harness(es) is okay, replace injector(s). If all 4 readings are correct, circuits are okay. Continue test.
  7. Disconnect all injector electrical connectors and connect pressure gauge to pressure relief valve. Pressurize fuel system. Connect electrical connector at injector 1. Crank engine for 5 seconds and record pressure reading immediately after end of 5 second crank cycle. Repeat procedure on remaining injectors, testing only one injector at a time.
  8. If all 4 readings in step 7) are not within 4 psi (.3 kg/cm2 ) of each other, replace injector(s) that is incorrect. If all readings are acceptable, check for fuel contamination or other engine malfunctions and test again. If problem remains, disconnect ECA plugs and check for corroded or damaged pins. Retest. If problem still exists, replace ECA.
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