Pinpoint Test HH: Exhaust Gas RECIRCULATION System Module (ESM): Introduction: Notes

WARNING: This page does not describe the selected car, but rather 30 other vehicles, including the 2006 Mercury Mountaineer, 2006 Mercury Monterey, 2006 Mercury Montego, 2006 Mercury Milan, and 2006 Mercury Mariner. However, it is still accessible from the selected car via links, so may be relevant.

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)

Fig 1: Identifying ESM Assembly (1 Of 2)

Courtesy of FORD MOTOR CO.

Fig 2: Identifying ESM Assembly (2 Of 2)

Courtesy of FORD MOTOR CO.

Fig 3: EGR System Module (ESM) Connector

Courtesy of FORD MOTOR CO.