Part 1
AA80E AUTOMATIC TRANSMISSION / TRANSAXLE: AUTOMATIC TRANSMISSION SYSTEM: P0746: Pressure Control Solenoid "A" Performance (Shift Solenoid Valve SL1)
P0746 - Pressure Control Solenoid "A" Performance (Shift Solenoid Valve SL1)
SYSTEM DESCRIPTION
The TCM detects the actual gear based on signals from the speed sensors (SP2, NC3 and NT).
Based on the detected gear and oil pressure switch output, the TCM detects related mechanical problems in the shift solenoid valves, valve body and automatic transmission.
HINT
Actual gear when a problem occurs in shift solenoid valve SL1:
- *1: Neutral
MONITOR DESCRIPTION
The TCM commands gear shifts by turning the shift solenoid valves on and off. According to the input shaft revolution (speed), intermediate (counter) shaft revolution (speed) and output shaft revolution (speed), the TCM detects the actual gear (1st, 2nd, 3rd, 4th, 5th, 6th, 7th or 8th gear position). When the gear commanded by the TCM and the actual gear 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)
