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Fuel Injector Circuit Test

  1. Ensure fuel pressure is within specification. See BASIC TESTING article in the ENGINE PERFORMANCE Section. If fuel pressure is not within specification, see appropriate FUEL PUMP CIRCUIT TEST under FUEL DELIVERY  .
  2. Check fuel injector operation. See FUEL INJECTOR(S) under FUEL CONTROL  . Turn ignition off. Disconnect injector connector and measure resistance between injector connector terminals. Resistance should be 0.8-1.8 ohms at 68°F (20°C). If resistance is not as specified, replace injector. If resistance is within specification, go to next step.
  3. Disconnect ECM connector "B" from ECM. Measure resistance between connector terminals B8 (Red Wire) and B17 (Yellow wire). Resistance should be 0.8-1.8 ohms at 68°F (20°C). If resistance is not as specified, check Red and Yellow wires for short, open or poor connections. If resistance is as specified, check ECM connections. If ECM connections are okay, replace ECM.
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