No Up–Shift To Overdrive (After Warm–Up) - Toyota Hilux Surf 1993 Owner's Manual

AT–68
Trouble No.3 No up–shift to overdrive (After warm–up)
Road test while shifting manually with solenoid
wire connector disconnected. Is there over–
drive up–shift in the D position when shifting
from L to 2 to D?
Yes
Connect solenoid wire connector, and while
driving does data link connector 1 TT terminal
voltage rise from 0 V to 7 V in sequence?
0³5 V
Is voltage between ECM terminals OD2 and E,
as follows?
O/D switch turn ON: 10–14 V
O/D switch turn OFF: 0 V
Yes
Is voltage between ECM terminals OD, and E,
as follows?
Approx. 5 V
Is voltage between ECM terminals OD, and E,
normal with the cruise control ECU connector
pulled out?
• Faulty ECM
• Faulty cruise control wire harness
AUTOMATIC TRANSMISSION
Are there 12 V between ECM terminals L
and E, when in the D position?
• Faulty Park/Neutral position switch circuit
• Faulty Park/Neutral position switch
– Troubleshooting (Electronic Control System)
Faulty transmission
0³7 V
• Faulty transmission
• Faulty solenoid
0³3 V
Are there 12 V between ECM
terminals 2 and E, when in the D
position?
Yes
Try another ECM
• Faulty O/D switch harness
• Faulty O/D switch
Yes
Try another ECM
Yes
Faulty cruise control ECU
Yes