Diagnostic Aids

Perform this test when instructed during QUICK TEST or if directed by other test procedures. This test is used to diagnose the following:

• Thermostat
• Wiring Harness Circuits (THTRC & VPWR)
• Powertrain Control Module (PCM)

Fig 1: Identifying Thermostat Heater Control Harness Connector Terminals

Courtesy of FORD MOTOR CO.