Celica (1994), Corolla, MR2 & Prizm
- Lift and support vehicle. Disconnect cruise control ECU. See Figure-Figure
. Remove combination meter. Turn ignition on. Using DVOM, measure voltage between SPD terminal of combination meter connector and ground. Refer to SPD CIRCUIT IDENTIFICATION table. Also, see Fig 1-Fig 5. Rotate front wheel.SPD CIRCUIT IDENTIFICATION
Application Terminal No. Corolla 9 Celica 3 MR2 10 Prizm 12 - If voltage pulses 0-5 volts, check continuity between ECT ECU harness connector E1 terminal and ground. If continuity does not exist, inspect and repair circuit as needed. If continuity does exist, replace ECT ECU and retest. If no voltage is present, go to next step. If voltage is 4-6 volts and remains unchanged, go to step 5).
- Turn ignition off. Disconnect ECT ECU harness connector. See Figure-Figure . Using ohmmeter, check continuity between combination meter harness connector SPD terminal and ECU SPD terminal. Refer to the Fig 6. If continuity exists, go to next step. If continuity does not exist, inspect and repair circuit as needed.
- Check continuity of 2 circuits between combination meter and VSS. See appropriate wiring diagram in WIRING DIAGRAMS . If continuity does not exist, inspect and repair circuit(s) as needed. If continuity exists, inspect VSS. See NO. 1 VEHICLE SPEED SENSOR under COMPONENT TESTING. Replace as needed.
- Disconnect VSS harness connector. Turn ignition on. Measure voltage between VSS harness connector terminal No. 1 (Red/Blue wire) and ground. If battery voltage is not present, inspect and repair circuit as needed. If battery voltage is present, replace combination meter and retest.
- Turn ignition off. Disconnect ECT ECU harness connector. Refer to the Figure-Figure . Using ohmmeter, check continuity between combination meter harness connector SPD terminal and ECT ECU SPD terminal. See Fig 6. If continuity exists, replace combination meter and retest. If continuity does not exist, inspect and repair circuit as needed.