{"model":"mk2","model_name":"MK2 Supra","vehicle":"Toyota Supra A60 (1982–1986, 5M-GE)","document":"Repair Manual","section":"AT","section_name":"Automatic Transmission","page":16,"pages_in_section":120,"title":"Trouble No. 4 No up-shift to overdrive (After warm-up)","section_header":"Automatic Transmission — Electric Control","ocr_text":"AT-16                    AUTOMATIC TRANSMISSION — Electric Control\n\nTrouble No. 4        No up-shift to overdrive (After warm-up)\n\nRoad test while shifting manually with ECT ECU\nconnector pulled out. Is there overdrive up-shift in D\nrange when shifting from L to 2 to D?\n                                                          No ——→ Faulty transmission\n           ↓\n          Yes\n           ↓\nConnect ECT ECU connector, and                            0 → 7V    • Faulty transmission\nwhile driving does DG terminal voltage                              • Faulty solenoid\nrise from 0V to 7V in sequence?\n           ↓\n    0 → 5V              0V\n           ↓               ↓\n                           ↓————————————→ 0 → 3V    There is 12V between ECT ECU terminals\n                                                    2 and GND when D range.\n                                              ↓                                    ↓\n                                             Yes                                  No\n                                              ↓                                    ↓\n                           There is 12V between ECT ECU\n                           terminals L and GND when D range.\n                                              ↓\n                                    No        ↓        Yes\n                                     ↓        ↓         ↓\n                                     ↓        ↓    • Faulty neutral start switch circuit\n                                     ↓        ↓    • Faulty neutral start switch\n                                     ↓        ↓         ↓\n                                     ↓        ↓———→ Try another ECT ECU ←————————┘\n                                     ↓\n                                     ↓\nIs voltage between terminals OD₃ and GND as                  • Faulty OD switch\nfollows?                                        No ————→       harness\n  OD switch turn ON:   12V (Aisin) or 5V (Denso)              • Faulty OD switch\n  OD switch turn OFF:  0V                                     • OD off light open\n           ↓\n          Yes\n           ↓\n    (Check OD cutout signal)\n           ↓\nIs voltage between terminals OD and GND as follows?\n  Approx.    5V (Denso) or 12V (Aisin)              Yes ——→ Try another ECT ECU\n  (coolant temp. above 70°C or 158°F)\n           ↓\n          No\n           ↓\n    (Check OD cutout signal)\n           ↓\nIs voltage between ECU terminals\nOD₁ and GND normal with the cruise                   Yes ——→ Faulty cruise control computer\ncontrol computer connector pulled out?\n                                                     No ——→ Faulty engine ECU\n                                                            (Short circuit in ECT wire harness\n                                                             or EFI water temp. sensor 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