AT/Automatic Transmission — Trouble No. 5 No lock-up (After warm-up), page 17

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