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5A-66 AUTOMATIC TRANSMISSION
Diagnostic Trouble Messages
The diagnostic trouble messages generated by the TCU and their possible causes are listed in table 6.1.3.
Table 6.1.2 - Transmission Operations for On/Off Solenoid Faults
Solenoid
1
Always ON
Always OFF
2
Always OFF
Always ON
3
Always OFF
Always ON
4
Always OFF
Always ON
6
Always OFF
Always ON
7
Always OFF
Always ON
Condition
First gear instead of second and fourth gear instead of third.
This results in a 1 ® 4 shift as the vehicle accelerates from rest.
Second gear instead of first and third gear instead of fourth.
This results in second gear starts.
Fourth gear instead of first and third gear instead of second.
This results in fourth gear starts.
Second gear instead of third and first gear instead of fourth.
This results in a 1 ® 2 then 2 ® 1 (overrun) downshift as the vehicle
accelerates from rest.
The following shifts become poor:
1 ® 3, 1 ® 4, 2 ® 1 2 ® 3, 2 ® 4, 4 ® 2, 4 ® 1.
The following shifts become poor:
3 ® 4, 4 ® 3, 3 ® 2.
There may be slippage in the gears during torque converter locking.
The following shifts become poor:
1 ® 2, 1 ® 3, 1 ® 4, 2 ® 3, 2 ® 4, 3 ® 1, 3 ® 2 (All Including Manual), 3 ® 4,
4 ® 1,4 ® 3.
The following shifts become poor:
2 ® 4, 3 ® 2.
There may be slippage in the gears during torque converter locking.
Line pressure always high.
Line pressure always low thus resulting in risk of slippage in gears.
Torque converter always unlocked.
Torque converter always locked in 3rd and 4th gears, causing the
vehicle to shudder at lower speeds,
Transmission Operation
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