Toyota Venza: Transmission Fluid Pressure Sensor / Switch "E" Circuit Low (P0989,P0990)

Toyota Venza Service Manual / U660e Automatic Transmission / Transaxle / Automatic Transaxle System / Transmission Fluid Pressure Sensor / Switch "E" Circuit Low (P0989,P0990)

DESCRIPTION

ATF pressure switch No. 3 is installed in the lock-up solenoid ATF output passage and is used to detect a malfunction in the lock-up solenoid.

DTC No.	DTC Detection Condition	Trouble Area
P0989	Transmission fluid pressure switch No. 3 is OFF when lock-up occurs in response to a lock-up request (2 trip detection logic).	ATF temperature sensor assembly (ATF pressure switch No. 3) Transmission wire TCM
P0990	When both of the following are detected (2 trip detection logic): Transmission fluid pressure switch No. 3 is ON when lock-up does not occur. Lock-up does not occur when shift solenoid valve (SLU) is requested to turn off in the lock-up range.

MONITOR DESCRIPTION

The TCM illuminates the MIL and stores the DTC when the TCM detects that the ATF pressure switch is OFF with the lock-up solenoid ON or when the TCM detects that the ATF pressure switch is ON with the lock-up solenoid OFF.

MONITOR STRATEGY

Related DTCs	P0989: Transmission fluid pressure switch No. 3 OFF malfunction P0990: Transmission fluid pressure switch No. 3 ON malfunction
Required sensors/Components	Transmission fluid pressure switch No. 3
Frequency of operation	Continuous
Duration	P0989: 1.8 sec. P0990 (a): 1.2 sec. P0990 (b): 0.6 sec.
MIL operation	2 driving cycles
Sequence of operation	None

TYPICAL ENABLING CONDITIONS

ALL:

The monitor will run whenever this DTC is not present. (Not circuit malfunction)	P0712, P0713 (ATF temperature sensor circuit (TFT sensor)) P0115, P0117, P0118 (ECT sensor circuit) P0715, P0717 (Turbine speed sensor circuit) P0791, P0793 (Intermediate shaft speed sensor circuit) P0748 (Shift solenoid valve SL1 circuit) P0778 (Shift solenoid valve SL2 circuit) P0798 (Shift solenoid valve SL3 circuit) P2810 (Shift solenoid valve SL4 circuit) P2759 (Shift solenoid valve SLU circuit) P2769, P2770 (Shift solenoid valve SL circuit) P0327, P0328, P0332, P0333 (KCS sensor circuit) P0120, P0121, P0122, P0123, P0220, P0222, P0223, P0604, P0606, P060A, P060B, P060D, P060E, P0657, P1607, P2102, P2103, P2111, P2112, P2118, P2119, P2135 ((ETCS) Electronic throttle control system) U0100 (CAN communication system)
ECT (Engine coolant temperature)	40°C (104°F) or more
Spark advance from Max. retard timing by KCS control	0°CA or more
Transmission range	"D"
TFT (Transmission fluid temperature)	-10°C (14°F) or more
TFT (Transmission fluid temperature) sensor circuit	No circuit malfunction
ECT (Engine coolant temperature) sensor circuit	No circuit malfunction
Turbine speed sensor circuit	No circuit malfunction
Intermediate shaft speed sensor circuit	No circuit malfunction
Shift solenoid valve SL1 circuit	No circuit malfunction
Shift solenoid valve SL2 circuit	No circuit malfunction
Shift solenoid valve SL3 circuit	No circuit malfunction
Shift solenoid valve SL4 circuit	No circuit malfunction
Shift solenoid valve SLU circuit	No circuit malfunction
Shift solenoid valve SL circuit	No circuit malfunction
(KCS) Knock control sensor circuit	No circuit malfunction
(ETCS) Electronic throttle control system	Not system down
CAN communication system	Not system down
Engine	Starting
TCM selected gear	Not 1st
Vehicle speed	15.5 mph (25 km/h) or more
Turbine speed/Output speed (NT/NO) with 1st	3.304 to 7.724
Turbine speed/Output speed (NT/NO) with 2nd	1.901 to 2.340
Turbine speed/Output speed (NT/NO) with 3rd	1.399 to 1.649
Turbine speed/Output speed (NT/NO) with 4th	0.998 to 1.138
Turbine speed/Output speed (NT/NO) with 5th	0.705 to 0.836
Turbine speed/Output speed (NT/NO) with 6th	0.568 to 0.695

P0989:

TCM lock-up command	ON
Engine speed - Turbine speed	Less than 35 rpm
Throttle valve opening angle	7% or more
Vehicle speed	Less than 62.1 mph (100 km/h)
Shift solenoid valve SLU	Not ON malfunction

P0990:

TCM indicated pressure valve of SLU	Less than 4 kPa
TCM lock-up command	OFF
Shift solenoid valve SLU	Not malfunction
Shift solenoid valve SL	Not OFF malfunction

TYPICAL MALFUNCTION THRESHOLDS

P0989:

Transmission fluid pressure switch No. 3

OFF

P0990:

Following conditions are met	(a) and (b)
(a) Engine speed - Turbine speed	35 rpm or more
(b) Transmission fluid pressure switch No. 3	ON

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Perform the universal trip to clear permanent DTCs (See page ).

PROCEDURE

1.	CHECK OTHER DTC OUTPUT (IN ADDITION TO DTC P0989 OR P0990)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(d) Enter the following menus: Powertrain / ECT / Trouble Codes.

(e) Read the DTCs using the Techstream.

Display (DTC Output)	Proceed to
Only "P0990" is output	A
Only "P0989" is output	B
"P0989 or P0990" and other DTCs are output	C

HINT:

If a solenoid is stuck OFF, DTCs for several solenoids including the malfunctioning solenoid will be detected.

GO TO STEP 4

GO TO DTC CHART

2.	CHECK TRANSMISSION WIRE (SHORT TO GROUND)

(a) Remove the TCM.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
19 (TPS3) - Body ground (Valve body assembly) or other terminals	Always	10 kΩ or higher

REPLACE TCM

3.	CHECK ATF TEMPERATURE SENSOR ASSEMBLY (ATF PRESSURE SWITCH NO. 3)

(a) Remove the oil strainer assembly.

(b) Disconnect the connector from the ATF temperature sensor assembly.

Standard Resistance:

Tester Connection	Condition	Specified Condition
1 (TPS3) - Body ground (Valve body assembly) or other terminals	Always	10 kΩ or higher

REPLACE TRANSMISSION WIRE

REPLACE ATF TEMPERATURE SENSOR ASSEMBLY

4.	CHECK TRANSMISSION WIRE

(a) Remove the oil strainer assembly.

(b) Remove the TCM.

(d) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
19 (TPS3) TCM side - 1 (TPS3) sensor side	Always	Below 1 Ω
1 (TPS3) sensor side - Body ground (Valve body assembly) or other terminals	Always	10 kΩ or higher

Text in Illustration

Front view of wire harness connector

(to TCM)

Front view of wire harness connector

(to ATF Temperature Sensor Assembly)

REPLACE TRANSMISSION WIRE

5.	REPLACE ATF TEMPERATURE SENSOR ASSEMBLY

(a) (See page ).

6.	CHECK IF DTC OUTPUT RECURS

(a) Connect the Techstream to the DLC3.

(b) Start the engine and turn the Techstream on.

HINT:

Write down the currently output DTCs before clearing them.

(d) Perform the monitor drive pattern (See page ).

(e) Enter the following menus: / ECT / DTC.

(f) Read the DTCs using the Techstream.

Display (DTC Output)	Proceed to
Only "P0989" is output	A
No output	B

REPLACE TCM

END

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