EFE Relay: Testing and Inspection

Checking Heater Continuity:

PTC HEATER

1. Disconnect the PTC heater connector.
2. Connect an ohmmeter between the connector and the intake manifold, and verify continuity.

Heater Connector And Relay Schematic:

PTC HEATER RELAY

1. Apply battery power (positive to No. 1 terminal and ground No. 2 terminal), and verify continuity at terminals 3 and 4, using an ohmmeter.

Terminals Power not applied Power applied

3-4 No continuity Continuity