Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSTOYOTA2004CELICA GT, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 14 (ENGINE CONTROL SYSTEM SELF-DIAGNOSTICS)DIAGNOSTIC TESTSDTC P1127: ELECTRONIC THROTTLE CONTROL SYSTEM ACTUATOR POWER SOURCE CIRCUITDIAGNOSIS & REPAIR
2004 Toyota Celica GT, Standard
Diagnosis & Repair
2004 Toyota Celica GT, StandardSECTION Diagnosis & Repair
WARNING: This page is about a different car, the 2002 Toyota Land Cruiser. However, it is still accessible from the selected car via links, so may be relevant.
- Remove THROTTLE fuse (15-amp) from fuse/relay box at driver's side front corner of engine compartment. Inspect THROTTLE fuse. If THROTTLE fuse is okay, reinstall fuse and go to next step. If THROTTLE fuse is defective, replace fuse and check for short in Yellow/Black wire between THROTTLE fuse and ECM. See WIRING DIAGRAMS article. ECM is located behind glove box. See Figure. Repair wiring as necessary.
- Remove glove box for access to ECM with electrical connectors still installed on ECM. See Figure. Using voltmeter, check voltage between body ground and terminal No. 7 (Yellow/Black wire) at ECM electrical connector E9. See Figure. This is the +BM terminal on ECM. Voltage should be 9-14 volts. If voltage is within specification, replace ECM. If voltage is not within specification, repair open between battery, THROTTLE fuse and Yellow/Black wire and electrical connectors between THROTTLE fuse and ECM. See WIRING DIAGRAMS article.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.