U151E Automatic Transaxle

U151E AUTOMATIC TRANSAXLE: AUTOMATIC TRANSAXLE SYSTEM: P0798: Pressure Control Solenoid "C" Electrical (Shift Solenoid Valve SL3)
P0798 - Pressure Control Solenoid "C" Electrical (Shift Solenoid Valve SL3)

DESCRIPTION

Shifting from 1st to 5th is performed in combination with the ON and OFF operation of the shift solenoid valves SL1, SL2, SL3, S4 or SR which are controlled by the ECM. If an open or short circuit occurs in any of the shift solenoid valves, the ECM controls the remaining normal shift solenoid valves to allow the vehicle to be operated safely .





MONITOR DESCRIPTION

The ECM commands gear shifts by turning the shift solenoid valves ON/OFF. When there is an open or short circuit in any shift solenoid valve circuit, the ECM detects the problem and illuminates the MIL and stores the DTC. And the ECM performs the fail-safe function and turns the other normal shift solenoid valves ON/OFF. In case of an open or short circuit, the ECM stops sending current to the circuit .

MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS





TYPICAL MALFUNCTION THRESHOLDS





COMPONENT OPERATING RANGE





WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
Perform the universal trip to clear permanent DTCs .

PROCEDURE

1. INSPECT TRANSMISSION WIRE (SHIFT SOLENOID VALVE SL3)

(a) Disconnect the B32 wire connector.





(b) Measure the resistance of the transmission wire.

Standard resistance:





NG -- INSPECT SHIFT SOLENOID VALVE SL3
OK -- Continue to next step.

2. CHECK WIRE HARNESS (TRANSMISSION WIRE - ECM)

(a) Disconnect the B30 ECM connector.





(b) Measure the resistance of the wire harness side connector.

Standard resistance:





NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR

OK -- REPLACE ECM

3. INSPECT SHIFT SOLENOID VALVE SL3

(a) Remove the shift solenoid valve SL3.





(b) Measure the resistance of the solenoid valve.

Standard resistance:

5.0 to 5.6 Ohms at 20°C (68°F)

(c) Connect the battery's positive (+) lead with a 21 W bulb to terminal 2 and the negative (-) lead to terminal 1 of the solenoid valve connector. Then check that the valve moves and makes an operating noise.

OK:

Valve moves and makes operating noise.

NG -- REPLACE SHIFT SOLENOID VALVE SL3

OK -- REPAIR OR REPLACE TRANSMISSION WIRE