Part 1

AA80E AUTOMATIC TRANSMISSION: AUTOMATIC TRANSMISSION SYSTEM: P0746: Pressure Control Solenoid "A" Performance (Shift Solenoid Valve SL1)
P0746 - Pressure Control Solenoid "A" Performance (Shift Solenoid Valve SL1)

DESCRIPTION

The TCM detects the gear position based on signals from the speed sensors (SP2 and NT).

Based on the detected gear position and oil pressure switch output, the TCM detects related mechanical problems in the shift solenoid valves, valve body and automatic transmission.

HINT
Gear shift position when a problem occurs in shift solenoid valve SL1:





- *1: When the vehicle is running with the transmission in a gear less than 6th
- *2: When the vehicle is running with the transmission in 6th gear or higher
- *3: Neutral





MONITOR DESCRIPTION

The TCM commands gear shifts by turning the shift solenoid valves on or off. According to the input shaft speed, intermediate (counter) shaft speed and output shaft speed, the TCM detects the actual gear position (1st, 2nd, 3rd, 4th, 5th, 6th, 7th or 8th gear position). When the gear position commanded by the TCM and the actual gear position are not the same, the TCM illuminates the MIL.

MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS

All





OFF malfunction (A)





OFF malfunction (B)





OFF malfunction (C)





OFF malfunction (D)





OFF malfunction (E)





OFF malfunction (F)





ON malfunction (A)





ON malfunction (B)





- When either condition below is met: Condition (1) or (2)

Condition (1)

- When one of the following conditions is met: Condition (a), (b), (c), (d), (e), (f), (g) or (h)

Condition (a)





Condition (b)





Condition (c)





Condition (d)





Condition (e)





Condition (f)





Condition (g)





Condition (h)





Condition (2)

- When all conditions below are met: Condition (a), (b), (c), (d), (e), (f), (g) and (h)

Condition (a)





Condition (b)





Condition (c)





Condition (d)





Condition (e)





Condition (f)





Condition (g)





Condition (h)





ON malfunction (C)





- When either condition below is met: Condition (1) or (2)

Condition (1)

- When one of the following conditions is met: Condition (a), (b), (c), (d), (e), (f), (g) or (h)

Condition (a)





Condition (b)





Condition (c)





Condition (d)





Condition (e)





Condition (f)





Condition (g)





Condition (h)





Condition (2)

- When all conditions below are met: Condition (a), (b), (c), (d), (e), (f), (g) and (h)

Condition (a)





Condition (b)





Condition (c)





Condition (d)





Condition (e)





Condition (f)





Condition (g)





Condition (h)





ON malfunction (D)





- When either condition below is met: Condition (1) or (2)

Condition (1)

- When one of the following conditions is met: Condition (a), (b), (c), (d), (e), (f), (g) or (h)