Sequential PFI Engines

Measure resistance between the suspect cylinder test pin (from the Cylinder Balance Test) and test pin No. 37 at the breakout box. Refer to appropriate INDIVIDUAL INJECTOR RESISTANCE . For no starts, choose any injector and measure resistance between that injector circuit test pin and test pin No. 37 at breakout box. Record resistance. Refer to appropriate INDIVIDUAL INJECTOR RESISTANCE .

Remove breakout box and reconnect ECA. Service open/short in harness/connector. If okay, replace injector. Rerun QUICK TEST and Cylinder Balance Test.

For No Start: Service open in VPWR circuit.

Connect test light between test pin No. 37 and the suspect injector(s) test pin at the breakout box.

Crank or start engine. A properly operating system is indicated by a test light that glows dimly. If light glows dimly, go to next step; except on sequential PFI engines. On sequential PFI engine, remove breakout box and reconnect ECA. Clean and test injectors. Rerun QUICK TEST and CYLINDER BALANCE TEST. If test light does not glow dimly, perform the following procedure:

• No Light - Check for 12 volts at test pins No. 37 and 57.
• Bright Light - Check injector circuit for shorts to ground. If system is okay, remove breakout box and replace ECA. Remove breakout box, reconnect all components and repeat QUICK TEST.

7) Fuel Pressure Problems: External Sources  Pressurize fuel system as per procedure in step 1 of this test. Examine fuel system using the following procedures as applicable: