AB60F
AB60F AUTOMATIC TRANSMISSION: AUTOMATIC TRANSMISSION SYSTEM: P0778: Pressure Control Solenoid "B" Electrical (Shift Solenoid Valve SL2)
P0778 - Pressure Control Solenoid "B" Electrical (Shift Solenoid Valve SL2)
DESCRIPTION
Shifting from 1st to 5th is performed in combination with the ON and OFF operation of the shift solenoid valves SL1, SL2, S1, S2, S3, S4 and SR, which are controlled by the ECM. If an open or short circuit occurs in the shift solenoid valves, the ECM controls the remaining normal shift solenoid valves to allow the vehicle to be operated safely .
Reference: Inspect using an oscilloscope.
Check the waveform of the ECM connector.
Standard:
MONITOR DESCRIPTION
This DTC indicates an open or short in the shift solenoid valve SL2 circuit. 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, illuminates the MIL and stores the DTC. Also, the ECM performs the fail-safe function and turns the other shift solenoid valves that are in good condition ON/OFF. In case of an open or short circuit, the ECM stops sending the current to the open or short circuited solenoid.
While driving and shifting gears, if the ECM detects an open or short in the shift solenoid valve SL2 circuit, the ECM determines there is a malfunction .
MONITOR STRATEGY
TYPICAL ENABLING CONDITIONS
All
Condition (A)
Condition (B)
TYPICAL MALFUNCTION THRESHOLDS
When either condition below is met: Condition (A) or (B)
Condition (A)
Condition (B)
COMPONENT OPERATING RANGE
WIRING DIAGRAM
INSPECTION PROCEDURE
NOTICE:
Perform the universal trip to clear permanent DTCs .
HINT
The shift solenoid valve SL2 is turned ON/OFF normally when the shift lever is on D:
PROCEDURE
1. INSPECT NO. 2 TRANSMISSION WIRE (SHIFT SOLENOID VALVE SL2)
(a) Disconnect the D64 No. 2 transmission wire connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:
NG -- INSPECT SHIFT SOLENOID VALVE SL2
OK -- Continue to next step.
2. CHECK HARNESS AND CONNECTOR (NO. 2 TRANSMISSION WIRE - ECM)
(a) Disconnect the D74 ECM connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:
Result
C -- REPLACE ECM Removal
B -- REPLACE ECM Removal
A -- REPAIR OR REPLACE HARNESS OR CONNECTOR
3. INSPECT SHIFT SOLENOID VALVE SL2
(a) Remove shift solenoid valve SL2.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:
(c) Connect the battery's positive (+) lead with a 21 W bulb to terminal 1 and the negative (-) lead to terminal 2 of the solenoid valve connector. Then check that the valve moves and makes an operating noise.
OK:
Valve moves and makes an operating noise.
NG -- REPLACE SHIFT SOLENOID VALVE SL2
OK -- REPAIR OR REPLACE NO. 2 TRANSMISSION WIRE