Circuit Description
The pressure control solenoid (PCS) valves, valves 3, 4, 5, and 6, are precision electronic pressure regulators that control the operation of the clutches, brakes, and lock-up clutch.
The valve reduces the system pressure with which the downstream solenoid valves and electrical pressure regulating valves are supplied. It is possible to use smaller solenoid valves as a result. The PCS require a constant input pressure.
Conditions for Setting the DTC
| • | The output voltage of the PCS 3, at ON, is 12 volts. |
| • | No DTC P1839 or P1841. |
Action Taken When The DTC Sets
| • | The malfunction indicator lamp (MIL) will illuminate. |
| • | The transmission control module (TCM) will record operating conditions at the time the diagnostic fails. This information will be stored in the Failure Records buffer. |
| • | Adopt Emergency/Substitute mode and constant 4th gear by hydraulic control. |
| • | After the ignition is OFF/ON: 3rd gear by hydraulic control. Possible P, R, and N also possible. |
| • | The power supply is cut-off to the PCS valve. |
Conditions for Clearing the MIL/DTC
| • | The MIL will turn OFF when the malfunction has not occurred after 3 ignition cycles. |
| • | A history DTC will clear after 40 consecutive warm-up cycles without a fault. |
| • | Using a scan tool can clear history DTCs. |
Diagnostic Aids
When DTC P1840 sets, the possible cause of the fault could be PCS 3.
Step | Action | Values | Yes | No |
|---|---|---|---|---|
1 | Did you perform the Diagnostic System Check - Vehicle? | -- | Go to Step 2 | |
2 |
Does the PCS 3 change ON/OFF? | -- | Go to Diagnostic Aids | Go to Step 3 |
3 |
Is the voltage within the specified value? | 11-14 V | Go to Step 4 | Go to Step 5 |
4 | Repair the internal line, PCS 3, for a short to power. Did you complete the repair? | -- | System OK | -- |
5 | Replace the PCS 3. Did you complete the replacement? | -- | Go to Step 6 | -- |
6 | Observe if any DTCs are set. Are there any DTCs that have not been diagnosed? | -- | System OK |
