Infiniti Fuel Pump Control Module

Infiniti Fuel Pump Control Module (FPCM) – Troubleshooting Guide

Important: Use this guide if you reinstalled your repaired Infiniti Fuel Pump Control Module (FPCM) and the problem is still happening.
Important: Please do not open/disassemble the module—check vehicle power, grounds, wiring, fuses, and fuel pressure instead.

• Step 1: Confirm the basics
  • Verify the FPCM connectors are fully seated and locked
  • Inspect for bent/pushed pins, corrosion, or loose terminals at the FPCM and harness
  • Make sure the module is mounted correctly and the harness isn’t under tension
• Step 2: Check battery voltage and grounds
  • Confirm battery is healthy and fully charged
  • Clean/tighten battery terminals and main chassis/engine grounds
  • Low system voltage can prevent the FPCM from enabling the pump
• Step 3: Verify power supply and fuses/relays
  • Check fuel pump related fuses/relays (under-hood and interior if applicable)
  • Confirm you have a solid ignition feed and constant feed to the fuel system circuit
  • If a fuse blows again, stop and inspect wiring/pump for a short before replacing more fuses
• Step 4: Verify the fuel pump and rear harness
  • Inspect the fuel pump connector at the tank for heat damage/melting or corrosion
  • Check for harness rub-through near the tank, frame, and rear seat/trunk pass-throughs
  • If the pump is noisy or intermittent, the pump itself can mimic a bad module
• Step 5: Check for fuel pressure (don’t guess)
  • Confirm actual fuel pressure during crank
  • If pressure is low/zero but power/ground/fuses are OK, suspect pump, clogged filter/strainer, or wiring
  • If pressure is correct but still “no start,” the cause is usually not the FPCM (spark, immobilizer, crank signal, etc.)
• Step 6: Scan for codes and look at live data
  • Pull codes from ECM and any fuel-related modules (not just a generic reader)
  • Note any immobilizer/security faults, crank/cam sensor faults, or throttle faults—these can cause a no-start even with good fuel pressure
• Step 7: If the issue started after recent work
  • Re-check anything recently touched (fuel pump install, wiring repairs, battery work, fuse/relay swaps)
  • Look for loose grounds, swapped relays, or pinched harness sections
• Course of action
  • If the problem persists, contact UpFix with your VIN, any DTCs, and measured fuel pressure so we can help narrow it down. Call or email for assistance.