DTC 18258

DTC 18258/ P1850

1) First check harness connectors for contact corrosion and water ingress, replace if necessary. if there are malfunctions indicated for the solenoid or pressure control valves, pay particular attention to the 16-pin harness connector at transmission between valve body and cable harness.
2) Pressure control valve 1 for auto. transmission -N215- is also referred to as solenoid valve 4 -N91-.
3) Pay attention to which hydraulic control the transmission has when selecting measuring value block.

Note: For DTC 18258/ P1850:
^ The transfer of data and information between the Transmission Control Module (TCM) and the control modules that communicate with the Transmission Control Module (TCM) occurs via a so-called CAN bus. All information signals are carried via 2 wires
^ Function of CAN bus