California vehicle only ECU +B(+B1) EGR Gas Temp. Sensor EGR Valve THG E2 E1 1 There is voltage between ECU terminals THG and E2. (IG SW ON) 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-35) Check wiring between ECU terminal E1 and body ground. OK BAD Repair or replace. Check EGR system. OK BAD Repair or replace. 3 Check EGR gas temp. sensor. (See page FI-118) BAD OK Replace EGR gas temp. sensor. Check wiring between ECU and EGR gas temp. sensor. OK BAD Try another ECU. Repair or replace. ECU Voltmeter THG E2 FI2945 2 ECU +B1 Voltmeter E1 FI0312 3 Ohmmeter Oil FI0874