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.
2006 Mercury Mariner 4WD V6-3.0L VIN 1FACTORY OEM SERVICE PROCEDURE
Tests DC: Mass Air Flow (MAF) Sensor
PINPOINT TEST DC: MASS AIR FLOW (MAF) SENSOR
This pinpoint test is intended to diagnose the following:
^ mass air flow sensor (12B579)
^ harness circuits: MAF SIG MAF RTN vehicle power (VPWR) power ground (PWRGND) IAT and SIGRTN
^ powertrain control module (PCM) (12A650)
Reference:
PCM Connector
Reference:
DC1 - DC3:
DC4 - DC6:
DC7 - DC8:
DC9:
DC10 - DC11:
DC12 - DC13:
DC14 - DC15:
DC16 - DC17:
DC18 - DC19:
DC20 - DC22:
DC23 - DC24:
DC25 - DC26:
DC27 - DC28:
DC29 - DC30:
DC31:
Factory Service Tools
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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.
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