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HOMESERVICE MANUALSTOYOTA2004CELICA GT, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 171 (ANTI-LOCK BRAKE SYSTEM)COMPONENT TESTSSPEED SENSOR SIGNAL CHECKWITHOUT TOYOTA HAND-HELD TESTER
2004 Toyota Celica GT, Standard

Without TOYOTA Hand-Held Tester

2004 Toyota Celica GT, StandardSECTION Without TOYOTA Hand-Held Tester
WARNING: This page is about a different car, the 2003 Toyota Tundra, 2002 Toyota Tundra, and 2001 Toyota Tundra. However, it is still accessible from the selected car via links, so may be relevant.
    NOTE: If ignition switch is turned from ON to ACC or LOCK during test mode, DTC will be erased.
  1. Ensure battery is fully charged. Turn ignition switch to ON position. Verify ABS warning light illuminates, then turns OFF after 3 seconds. If ABS warning light does not illuminate, check fuse, bulb, and wiring harness. See ABS WARNING LIGHT  under SYSTEM TESTS.
  2. Turn ignition OFF. Connect a jumper wire between DLC3 terminals Ts and CG. See Figure. Start engine. ABS warning light should flash 4 times per second.
  3. Drive vehicle at speeds greater than 28 MPH for several seconds. Stop vehicle. Connect a jumper wire between DLC3 terminals Tc and CG.
  4. If a DTC is stored, ABS warning light will begin to flash a 2-digit DTC. First group of flashes indicate first digit in DTC. After a 1.5-second pause, second group of flashes indicate second digit in a DTC.
  5. If 2 or more DTCs are stored, there will be a 2.5-second pause between each DTC. After all DTCs are flashed, there will be a 4-second pause, then all DTCs will repeat. If each sensor is normal, a normal code is output (a cycle of 0.25 seconds ON and 0.25 seconds OFF is repeated).
  6. Record DTCs. Turn ignition off. Repair as necessary. See DIAGNOSTIC TROUBLE CODE DEFINITIONS  under SELF-DIAGNOSTIC SYSTEM. See DTC 31, 32, 33 & 34: SPEED SENSOR CIRCUIT  under DIAGNOSTIC TESTS for speed sensor diagnostic procedures. Clear DTCs. See CLEARING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM.
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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.