P1874

DTC P1874: Solenoid Valve Power Supply Circuit Shorted to Power





Circuit Description
The pressure control valves (EDS 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 EDS require a constant input pressure.

Conditions for Setting the DTC
^ No DTC P1873.
^ Immediately after the above condition occurs.

Action Taken When the DTC Sets
^ The Malfunction Indicator Lamp (MIL) will illuminate.
^ The 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.
^ Power supply cut OFF to the EDS valve.

Conditions for Clearing the MIL/DTC
^ The MIL will turn OFF when the malfunction has not occurred after three-ignition cycle.
^ 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 P1874 sets, the possible cause of fault could be solenoid valve power supply line.

Troubleshooting

Steps 1-8: