P0798

U660E AUTOMATIC TRANSAXLE: AUTOMATIC TRANSAXLE SYSTEM: P0798: Pressure Control Solenoid "C" Electrical (Shift Solenoid Valve SL3)

DTC P0798 - Pressure Control Solenoid "C" Electrical (Shift Solenoid Valve SL3)

DESCRIPTION

Shifting gears from 1st through 5th is performed in combination with "ON" and "OFF" operation of the shift solenoid valves SL1, SL2, SL3 and SL4 which are controlled by the TCM. If an open or short circuit occurs in any of the shift solenoid valves, the TCM controls the remaining normal shift solenoid valves to allow the vehicle to be operated smoothly (Fail safe function).

MONITOR DESCRIPTION

The TCM commands gear shifts by turning the shift solenoid valves on or off. When there is an open or short circuit in any shift solenoid valve circuit, the TCM detects the problem and illuminates the MIL and stores the DTC. And the TCM performs the fail-safe function and turns the other normal shift solenoid valves on or off. (In case of an open or short circuit, the TCM stops sending current to the circuit.)
Fail-Safe Chart

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

ALL:

Condition (A)

Condition (B)

Condition (C)

TYPICAL MALFUNCTION THRESHOLDS

When one of the following conditions is met: Condition (A), (B) or (C)

Condition (A) and (B)

Condition (C)

COMPONENT OPERATING RANGE

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1. INSPECT TRANSMISSION WIRE (SL3)

(a) Remove the TCM from the transaxle.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:

OK -- REPLACE TCM
NG -- Continue to next step.
2. INSPECT SHIFT SOLENOID VALVE (SL3)

(a) Remove the shift solenoid valve SL3.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:

(c) Connect a positive (+) lead through a 21 W bulb to terminal 2 and a negative (-) lead to terminal 1 of the solenoid valve connector, then check the movement of the valve.
OK:
The solenoid makes an operating noise.
NG -- REPLACE SHIFT SOLENOID VALVE (SL3)
OK -- REPLACE TRANSMISSION WIRE