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

This pinpoint test is intended to diagnose the following:

• ESM (9Y456)
• orifice tube assembly (9D477)
• differential pressure feedback exhaust gas recirculation (EGR) sensor pressure hoses
• vacuum lines
• harness circuits: DPFE, SIGRTN, EVR, VPWR and VREF
• powertrain control module (PCM) (12A650)
  Fig 1: Identifying EGR System Module (ESM) Connector

  Courtesy of FORD MOTOR CO.