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Shift Points Too High Or Low

  1. Warm engine to normal operating temperature. Connect voltmeter between terminals TT and E1 of DLC1 connector. Refer to the Figure-11.
  2. Turn ignition on. Depress and release throttle pedal. Note if voltage changes with throttle opening. If voltage changes with throttle opening, go to step 6). If voltage does not change with throttle opening, go to next step.
  3. Access ECT ECU. See Figure-Figure . Connect voltmeter between terminals B/K and E1 on ECT ECU with connector connected. See Figure.
  4. No voltage should exist with brake pedal released. Approximately 10-14 volts should exist with brake pedal depressed. If voltage is not as specified, check for defective brakelight switch or wiring circuit.
  5. If voltage is as specified, check for defective ECT ECU power source or ground connections. See appropriate wiring diagram in WIRING DIAGRAMS . Check for short or open circuit in wire to TT terminal of DLC connector. See THROTTLE POSITION SENSOR SIGNAL  under ELECTRICAL TESTING and the appropriate wiring diagram under WIRING DIAGRAMS . Check for defective throttle position sensor or wiring.
  6. On 1993 Celica, connect voltmeter between terminals P and E1 on ECT ECU with connector connected. See Figure. Check voltage with pattern select switch in POWER (depressed) and NORMAL (released) operating positions (if applicable).
  7. Voltage should be 10-14 volts with switch in POWER position and one volt with switch in NORMAL position. If voltage is as specified, ECT ECU or transmission is defective. If voltage is not as specified, check for defective pattern select switch or wiring circuit. See PATTERN SELECT SWITCH  under COMPONENT TESTING.
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