TSRM/MK3 Supra/Repair Manual
Repair ManualWiring DiagramsCommunity Fixes
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FI/EFI System, page 69

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p.070
EFI System — MK3 Supra EFI System, page 69
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Page text (OCR transcript)
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.