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

WARNING: This page does not describe the selected car, but rather 32 other vehicles, including the 2005 Mercury Sable, 2005 Mercury Mountaineer, 2005 Mercury Monterey, 2005 Mercury Montego, and 2005 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: ESM EGR Assembly (1 Of 2)

Courtesy of FORD MOTOR CO.

Fig 2: ESM EGR Assembly (2 Of 2)

Courtesy of FORD MOTOR CO.

Fig 3: EGR System Module (ESM) Connector

Courtesy of FORD MOTOR CO.