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HOMESERVICE MANUALSMAZDA2006B4000 BASE, AUTOMATICREPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISENGINE SYMPTOM TROUBLESHOOTING - (5 OF 5)GENERAL TEST INDEXPINPOINT TEST 10: FUEL LINE PRESSURE/FUEL PRESSURE HOLD INSPECTION
2006 Mazda B4000 Base, Automatic

Pinpoint Test 10: Fuel Line Pressure/Fuel Pressure Hold Inspection

2006 Mazda B4000 Base, AutomaticSECTION Pinpoint Test 10: Fuel Line Pressure/Fuel Pressure Hold Inspection
PINPOINT TEST 10: FUEL LINE PRESSURE/FUEL PRESSURE HOLD INSPECTION

PINPOINT TEST 10 FUEL LINE PRESSURE / FUEL PRESSURE HOLD INSPECTION
STEP INSPECTION ACTION
1 CHECK FUEL PRESSURE
WARNING:
  • Before performing the following operation, release the fuel pressure from the fuel system to reduce the possibility of injury or fire. See FUEL PRESSURE RELIEF .
  • Install fuel pressure gauge SST 49 UN01 010.
  • Key ON, Engine OFF (KOEO).
  • Connect WDS or equivalent tester to the DLC and select Active Command Mode.
  • Select OUTPUT TEST MODE.
  • Press MODE to change to the "ALL ON" mode, and press start to run fuel pump.
  • Turn relay off.
  • Observe fuel pressure.
  • Is fuel pressure between 207-448 kPa (30-65 psi)? 
 Yes Go to next step.
No Zero or low pressure:
Check fuel pump.
If as specified, check fuel line and/or fuel filter for clog or restriction.
Pressure high:
Go to next step.
2 CHECK FUEL PRESSURE AFTER ONE MINUTE
  • Observe fuel pressure after 1 minute.
  • Is fuel pressure within 34 kPa (5 psi) of previous reading? 
 Yes Fuel pressure hold inspection OK.
No Check the following:
  • Injector fuel leakage.

See GENERAL PINPOINT TEST 11: FUEL INJECTOR INSPECTION  .
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.