DTC : P0979 (2016 2017 2018 2019 2020): General Description
Hydraulic pressure supply to the clutch by shift solenoid valve output
| Neutral - 1st | 1st | Neutral - Reverse | Reverse | |
|---|---|---|---|---|
| Shift solenoid valve A | ON | ON | ON | OFF |
| Shift solenoid valve B | OFF | ON | OFF | OFF |
| Shift solenoid valve C | OFF | OFF | ON | ON |
| 1st clutch | CPCD | LINE | - | - |
| 4th clutch | - | - | CPCD | LINE |
| Lock-up ON | |
|---|---|
| Shift solenoid valve A | ON/OFF |
| Shift solenoid valve B | ON/OFF |
| Shift solenoid valve C | ON |
| Torque converter clutch | CPCD |
LINE : Line pressure
CPCD: A/T clutch pressure control solenoid valve D pressure
When shift solenoid valves A, B, and C are turned ON, the hydraulic pressure circuit opens. The hydraulic pressure circuit supplies/discharges hydraulic pressure to/from each clutch according to the combination of the ON/OFF status of the shift solenoid valves. The powertrain control module (PCM) commands the driver circuit to turn on the shift solenoid valve. The circuit detects malfunctions such as a circuit short or open, and sends back a return signal during the PCM's command. When the return signal does not match the PCM command to turn ON the shift solenoid valve, the PCM detects a malfunction and stores a DTC.