P2759

A750E AUTOMATIC TRANSMISSION: AUTOMATIC TRANSMISSION SYSTEM: P2759: Torque Converter Clutch Pressure Control Solenoid Control Circuit Electrical (Shift Solenoid Valve SLU)

DTC P2759 - Torque Converter Clutch Pressure Control Solenoid Control Circuit Electrical (Shift Solenoid Valve SLU)

DESCRIPTION





The current flow to the solenoid is controlled by the duty ratio* of the ECM output signal. The higher the duty ratio becomes, the higher the lock-up hydraulic pressure becomes during the lock-up operation.
*: The duty ratio is the ratio of the continuity to non-continuity in one cycle.
For example, if A is the period of continuity in one cycle, and B is the period of non-continuity, then Duty Ratio = A/(A+B) x 100(%).






MONITOR DESCRIPTION

When an open or short is detected in the shift solenoid valve (SLU) circuit, the ECM determines that there is a malfunction. The ECM turns on the MIL and stores this DTC.

MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS

The following conditions are common to Conditions (A) and (B).






Condition (A)





Condition (B)





TYPICAL MALFUNCTION THRESHOLDS

Either of the following conditions is met: Condition (A) or (B).

Condition (A)





Condition (B)





COMPONENT OPERATING RANGE





WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. INSPECT TRANSMISSION WIRE (SLU)
(a) Disconnect the transmission wire connector from the transmission.




(b) Measure the resistance.
Standard resistance:





(c) Measure the resistance.
Standard resistance (Check for short):






NG -- INSPECT SHIFT SOLENOID VALVE SLU
OK -- Continue to next step.
2. CHECK HARNESS AND CONNECTOR (TRANSMISSION WIRE - ECM)




(a) Connect the transmission wire connector to the transmission.
(b) Disconnect the ECM connector.
(c) Measure the resistance.
Standard resistance:





(d) Measure the resistance.
Standard resistance (Check for short):






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE ECM
3. INSPECT SHIFT SOLENOID VALVE SLU




(a) Remove the shift solenoid valve SLU.
(b) Measure the resistance.
Standard resistance:





(c) Connect the positive (+) lead with a 21 W bulb to terminal 2 and the negative (-) lead to terminal 1 of the solenoid valve connector, then check the movement of the valve.
OK:
The solenoid makes operating sounds.
NG -- REPLACE SHIFT SOLENOID VALVE SLU
OK -- REPAIR OR REPLACE TRANSMISSION WIRE