P0758

DTC P0758 Shift Solenoid "B" Electrical

CIRCUIT DESCRIPTION

Shifting from 1st to O/D is performed in combination with ON and OFF of the shift solenoid valves No. 1 and No. 2 controlled by the ECM. If an open or short circuit occurs in either of the shift solenoid valves, the ECM controls the remaining normal shift solenoid valve to allow the vehicle to be operated smoothly (Fail-safe function).





Fail-safe function:
If either of the shift solenoid valve circuits develops an open or short, the ECM turns the other shift solenoid ON and OFF to shift the gear positions as shown in the table below. The ECM also turns the shift solenoid valve SL OFF at the same time. If both solenoids are malfunctioning, hydraulic control cannot be performed electronically and must be done manually.
Manual shifting as shown in the table must be done (In the case of a short circuit, the ECM stops sending current to the short circuited solenoid).

DTC Detecting Condition:

HINT: Check the shift solenoid valve No. 1 when DTC P0753 is output and check the shift solenoid valve No. 2when DTC P0758 is output.

MONITOR DESCRIPTION

Monitor Strategy:

Typical Enabling Conditions:

Typical Malfunction Thresholds:

The ECM commands transmission gearshifts by turning the shift-solenoid valves ON and OFF. If the ECM detects an open or short circuit in any shift-solenoid valve, it will illuminate the MIL and set a DTC. At this time, the ECM will enter the "fail-safe" mode. The ECM will stop sending command signal(s) to the malfunctioning solenoid but will continue to operate the other solenoid valves to provide partial transmission operation.

Wiring Diagram:

Step 1:

Step 2 - 3:

INSPECTION PROCEDURE