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 HH: Exhaust Gas Recirculation System Module (ESM)
PINPOINT TEST HH: EXHAUST GAS RECIRCULATION SYSTEM MODULE (ESM)
This pinpoint test is intended to diagnose the following:
^ exhaust gas recirculation system module (ESM) (9Y456)
^ orifice tube assembly (9D477)
^ differential pressure feedback EGR (DPFE) sensor pressure hoses
^ vacuum lines
^ harness circuits: VREF DPFE SIGRTN EVR VPWR
^ powertrain control module (PCM) (12A650)
Reference:
Reference:
PCM Connector
Reference:
HH1 - HH3:
HH4 - HH5:
HH6 - HH7:
HH8 - HH9:
HH10 - HH11:
HH12 - HH13:
HH14 - HH16:
HH17 - HH18:
HH19 - HH20:
HH21 - HH22:
HH23 - HH24:
HH25 - HH26:
HH27:
HH28:
HH29:
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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