Part 1

AA80E AUTOMATIC TRANSMISSION: AUTOMATIC TRANSMISSION SYSTEM: P0776: Pressure Control Solenoid "B" Performance (Shift Solenoid Valve SL2)
P0776 - Pressure Control Solenoid "B" Performance (Shift Solenoid Valve SL2)

SYSTEM DESCRIPTION

Based on signals from the transmission speed sensors (NT, SP2 and NC3), gear position is detected.

If the detected gear position is different than the commanded gear position, 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 SL2:





*: Neutral





MONITOR DESCRIPTION

The TCM commands gear shifts by turning the shift solenoid valves on or off. According to the input shaft revolution, intermediate (counter) shaft revolution and output shaft revolution, 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)





ON malfunction (A)





- 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 (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)





TYPICAL MALFUNCTION THRESHOLDS

OFF malfunction

- When one of following conditions is met: OFF malfunction (A), (B), (C), (D) or (E)

OFF malfunction (A)





OFF malfunction (B)





OFF malfunction (C)





OFF malfunction (D)





OFF malfunction (E)





ON malfunction

- When one of following conditions is met: ON malfunction (A), (B) or (C)

- 2 detections are necessary per driving cycle:

- 1st detection: temporary flag ON

- 2nd detection: pending fault code ON

ON malfunction (A)

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

Condition (1)





Condition (2)





ON malfunction (B)

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

Condition (1)





Condition (2)