California vehicles only ECU +B (+B1) EGR Gas Temp. Sensor EGR Valve THG E2 E1 F10303 1 No voltage between ECU terminal THG and E2. (IG SW ON) ECU Voltmeter THG E2 F03727 2 Check that there is voltage between ECU terminal +B (+B1) and body ground. (IG SW ON) OK NO Refer to No. 1. (See page FI-54) ECU 2 Check wiring between ECU terminal E1 and body ground. Voltmeter +B OK BAD Repair or replace. F03762 Check EGR system. BAD Repair or replace. OK Ohmmeter 3 Check EGR gas temp. sensor. (See page FI-118) BAD OK Replace EGR gas temp. Check wiring between ECU and sensor. EGR gas temp. sensor. Oil OK BAD F02674 Try another ECU. Repair or replace.