Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
H7 - Check Resistance of Injector(s) and Harness MFI Engines
1994 Ford Aerostar AWD V6-245 4.0LSECTION H7 - Check Resistance of Injector(s) and Harness MFI Engines
- Key "OFF".
- Disconnect Powertrain Control Module (PCM). Inspect for damaged or pushed out pins, corrosion, loose wires, etc. Service as necessary.
NOTE: This erases Continuous Memory.
- Install breakout box, leave PCM disconnected.
- Measure resistance of injector bank 1 between test pin 37 and test pin 58 at the breakout box. Record resistance.
- Measure resistance of injector bank 2 between test pin 37 and test pin 59 at the breakout box. Record resistance.
- Refer to Fuel Injector Resistance Specification/Injector Bank Resistance (Multiport Fuel Injection). Injector Bank Resistance (Multiport Fuel Injection)
- Is each resistance within specification for the appropriate engine?
Yes -- Go to H12. H12 - Check Injector Driver Signal
No -- For no start: Service open in VPWR circuit.
For others: Go to H9. H9 - Check Continuity of Fuel Injector Harness
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.