Diagnostic Aids

Perform this test when instructed by QUICK TEST. This test is intended to diagnose the following:

• Exhaust Gas Recirculation System Module (ESM).
• Differential pressure feedback EGR sensor.
• Differential pressure feedback EGR sensor pressure hoses.
• Vacuum lines.
• Harness circuits: VREF, DPFE, SIG, SIG RTN, EVR, EVR PWR.
• Powertrain Control Module (PCM).

Fig 1: Identifying Exhaust Gas Recirculation System Components

Courtesy of FORD MOTOR CO.

For exhaust gas recirculation system connector terminal identification, see Fig 2.

Fig 2: Identifying MAP Sensor Harness Connector Terminals (Aviator, Crown Victoria, Grand Marquis, LS, Marauder, Thunderbird & Town Car)

Courtesy of FORD MOTOR CO.