EFE Heater
- With engine coolant temperature less than 140°F (60°C), disconnect EGR heater connector. Measure resistance across heater connector terminals. If continuity does not exist, replace heater. If continuity exists, start engine. Measure voltage between White (pos.) and Black (neg.) terminals of heater harness. If battery voltage is not present, go to step 4).
- If battery voltage is present, warm engine to operating temperature (cooling fan comes on). Measure voltage between White (pos.) and Black (neg.) terminals of heater harness. If battery voltage is not present, EFE system is functioning properly.
- If voltage is present, disconnect 2-wire connector near EFE heater relay. Measure voltage between Blue (pos.) and Black (neg.) terminals of wire harness. If voltage is not present, replace relay. If voltage is present, go to EFE CONTROL UNIT
testing.
- If battery voltage was not present in step 1), measure voltage between ground and White wire terminal. If voltage is now present, repair open in Black wire between EFE heater and ground. If voltage is not present, Inspect White wire for open between heater and EFE relay. If wire is okay, disconnect 2-wire connector near EFE heater relay. See Fig 1
.
- Measure voltage between ground and White/Red wire of connector. If voltage is not present, repair open in White/Red wire or replace No. 24 fuse. If voltage is present, disconnect remaining 2 wire connector near EFE heater relay. Measure voltage between Blue (pos.) and Black (neg.) terminals of wire harness. If voltage is present, replace relay. If voltage is not present, measure voltage between ground and Blue wire terminal. If voltage is present, repair open Black wire between relay and ground.
- If voltage is not present, inspect Blue wire between EFE heater relay and EFE control unit. If wire is okay, go to EFE CONTROL UNIT
testing.
Courtesy of AMERICAN HONDA MOTOR CO., INC.