AUTOMATIC TRANSMISSION — Electric Control AT-17 Trouble No. 5 No lock-up (After warm-up) Warm up engine Coolant temp: 80°C (176°F) ATF temp: 50 — 80°C (122 — 176°F) Read diagnostic code (See page AT-8) Output diagnostic code No indicated Proceed to trouble No. 1 (AT-12) Road test Connect a voltmeter to DG terminal and body ground. Is there 7, 5 or 3V in the lock-up range Yes • No. 3 solenoid stuck while driving? • Faulty transmission • Faulty lock-up mechanism No Is voltage between ECT ECU BR and GND terminal as follows? Yes • Faulty computer power source Brake pedal depressed : 12V and earth. Brake pedal released : 0V • Faulty throttle position signal No Faulty brake signal