TROUBLESHOOTING NOTE: • If diagnostic code No. 42, 61, 62 or 63 occur, the overdrive indicator light will begin to blink immediately to warn the driver. However, an impact or shock may cause the blinking to stop although the code will still be retained in the ECT ECU memory until canceled out. • There is no warning for diagnostic code No. 64. • In event of a simultaneous malfunction of both speed sensors No. 1 and No. 2, no diagnostic code will appear and fail-safe will not function. However, when driving in "D" range, the transmission will not up-shift from first gear regardless of the vehicle speed. Trouble No. 1 Blinking overdrive indicator light (while driving) Output diagnosis code (See page AT-8) Code No. 42, 61 • Faulty speed sensor circuit • Faulty speed sensor Code No. 62, 63, 64 Disconnect ECT ECU connector and there is 11 — 15 Ω between connector terminal S₁, S₂, S₃ — GND No • Faulty solenoid circuit • Faulty solenoid Yes Try another ECT ECU