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HOMESERVICE MANUALSTOYOTA2004CELICA GT, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 14 (ENGINE CONTROL SYSTEM SELF-DIAGNOSTICS)DIAGNOSTIC TESTSDTC P1600: ENGINE CONTROL MODULE BATT 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.
  1. 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. 1 (Black/Red wire) at ECM electrical connector E9. See Figure. This is the BATT terminal on ECM. Voltage should be 9-14 volts. If voltage is not within specification, go to next step. If voltage is within specification, replace ECM.
  2. Remove EFI fuse (20-amp) from fuse/relay box at driver's side front corner of engine compartment. EFI fuse may also be referred to as ECD fuse. Inspect EFI fuse. If EFI fuse is okay, reinstall fuse. Check wiring harness and electrical connectors between EFI fuse and ECM. See WIRING DIAGRAMS article. It may be necessary to check wiring between battery and EFI fuse. For additional wiring for EFI fuse to the battery, see POWER DISTRIBUTION article in WIRING DIAGRAMS. If EFI fuse is defective, replace fuse and check for short in wiring harness and components connected to EFI fuse. See WIRING DIAGRAMS article. Repair wiring harness or electrical connectors as necessary.
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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.