DTC : P0747: General Description
Hydraulic pressure supply to the clutch by shift solenoid valve output (D position)
| Gear position | Shift solenoid valve | Clutch | ||||||
|---|---|---|---|---|---|---|---|---|
| A | B | 1st | 2nd | 3rd | 4th | 5th | 6th | |
| Neutral-1st | ON | OFF | CPCD | - | - | - | - | - |
| 1st | ON | ON | LINE | CPCA | CPCB | CPCC | - | - |
| 1st-2nd | ON | ON | LINE | CPCA | CPCB | CPCC | - | - |
| 2nd | ON | ON | LINE | CPCA | CPCB | CPCC | - | - |
| 2nd-3rd | ON | ON | LINE | CPCA | CPCB | CPCC | - | - |
| 3rd | OFF | ON | LINE | - | CPCB | CPCC | CPCA | - |
| 3rd-4th | OFF | ON | LINE | - | CPCB | CPCC | CPCA | - |
| 4th | OFF | OFF/(ON) | LINE | - | (CPCB) | CPCC | CPCA | CPCB |
| 4th-5th | OFF | OFF | LINE | - | - | CPCC | CPCA | CPCB |
| 5th | OFF | OFF/(ON) | LINE | - | (CPCB) | CPCC | CPCA | CPCB |
| 5th-6th | OFF | OFF | LINE | - | - | CPCC | CPCA | CPCB |
| 6th | OFF | OFF | LINE | - | - | CPCC | CPCA | CPCB |
LINE : Line pressure
CPCA: A/T clutch pressure control solenoid valve A pressure
CPCB: A/T clutch pressure control solenoid valve B pressure
CPCC: A/T clutch pressure control solenoid valve C pressure
CPCD: A/T clutch pressure control solenoid valve D pressure
A/T clutch pressure control solenoid valve A is installed on the transmission housing. A/T clutch pressure control solenoid valve A is operated by the powertrain control module (PCM) and converts line pressure to A/T clutch pressure control solenoid valve A pressure. A signal from the PCM is output to A/T clutch pressure control solenoid valve A to supply proper A/T clutch pressure control solenoid valve A pressure to the correct gear clutch according to the shift schedule and the driving conditions. When the current from the PCM is high (ON), A/T clutch pressure control solenoid valve A operates and A/T clutch pressure control solenoid valve A pressure increases. When the current from the PCM is low (OFF), A/T clutch pressure control solenoid valve A turns off and A/T clutch pressure control solenoid valve A pressure decreases. The PCM monitors the input shaft (mainshaft) speed and the output shaft (countershaft) speed according to the shift status determined by the shift schedule, and monitors the transmission fluid pressure switch according to the shift status determined by the shift schedule. When an improper gear ratio is output for the shift schedule or when the wrong transmission fluid pressure switch is on for the shift schedule, the PCM detects an A/T clutch pressure control solenoid valve A stuck on failure and stores a DTC.