TOYOTA HIGHLANDER 2001 Service Repair Manual

BR3795OK NG
- DIAGNOSTICSELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT] (U241E/U140F)05-969
1159 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
INSPECTION PROCEDURE
HINT:
According to the DATA LIST displayed by the OBD II scan tool or hand-held tester, you can read the value
of the switch, sensor, actuator and so on without parts removal. Reading the DATA LIST as the first step of
troubleshooting is one method to shorten labor time.
(a) Warm up the engine.
(b) Turn the ignition switch off.
(c) Connect the OBD II scan tool or hand-held tester to the DLC3.
(d) Turn the ignition switch to the ON position.
(e) Push the ºONº button of the OBD II scan tool or the hand-held tester.
(f) When you use hand-held tester:
Select the item ºDIAGNOSIS/ENHANCED OBD II/DATA LISTº.
(g) According to the display on tester, read the ºDATA LISTº.
ItemMeasurement Item/
Range (display)Normal Condition
SPD (NC)Counter Gear Speed/
display: 50 r/min
[HINT]
4th (O/D) when shift lever position is D position
(After warming up the engine);

Intermediate shaft speed (NC) becomes close
to the engine speed.
HINT:

SPD (NC) is always 0 while driving:
Open or short in the sensor or circuit.

SPD (NC) is always more than 0 and less than 300 rpm while driving the vehicle at 50 km/h (31 mph)
or more:
Sensor trouble, improper installation, or intermittent connection trouble of the circuit.
1 INSPECT SPEED SENSOR INSTALLATION
(a) Check the speed sensor installation.
OK:
The installation bolt is tightened properly and there is
no clearance between the sensor and transaxle case.
NG REPLACE SPEED SENSOR(NC)
OK

C58536
1 2
Sensor Side:
(Connector Front View):
C6
C82158C91565
NC+
NC-
E7E8E9E6E5
ECM:
05-970- DIAGNOSTICSELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT] (U241E/U140F)
1160 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
2 INSPECT SPEED SENSOR(NC)
(a) Disconnect the speed sensor connector from the trans-
axle.
(b) Measure the resistance according to the value(s) in the
table below.
Standard:
TOYOTA made:
Tester ConnectionSpecified Condition
20 C (68 F)
1 - 2500 to 620 W
Standard:
AISIN made:
Tester ConnectionSpecified Condition
20 C (68 F)
1 - 2560 to 680 W
NG REPLACE SPEED SENSOR(NC)
OK
3 CHECK HARNESS AND CONNECTOR(SPEED SENSOR - ECM)
(a) Connect the speed sensor connector.
(b) Disconnect the ECM connector.
(c) Measure the resistance according to the value(s) in the
table below.
Standard:
TOYOTA made:
Tester ConnectionSpecified Condition
20 C (68 F)
E8 - 26 (NC+) - E8 - 34 (NC-)500 to 620 W
Standard:
AISIN made:
Tester ConnectionSpecified Condition
20 C (68 F)
E8 - 26 (NC+) - E8 - 34 (NC-)560 to 680 W
(d) Measure the resistance according to the value(s) in the
table below.
Standard (Check for short):
Tester ConnectionSpecified Condition
E8 - 26 (NC+) - Body ground10 kW or higher
E8 - 34 (NC-) - Body ground=
NG REPAIR OR REPLACE HARNESS OR
CONNECTOR (SEE PAGE 01-36)
OK
REPLACE ECM (SEE PAGE 10-9)

- DIAGNOSTICSELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT] (U151E/U151F)05-1089
1279 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
DTC P0796 PRESSURE CONTROL SOLENOID ºCº
PERFORMANCE (SHIFT SOLENOID VALVE
SL3)
SYSTEM DESCRIPTION
The ECM uses signals from the vehicle speed sensor to detect the actual gear position (1st, 2nd, 3rd, 4th
or 5th gear).
Then the ECM compares the actual gear with the shift schedule in the ECM memory to detect mechanical
troubles of the shift solenoid valves and valve body.
DTC No.DTC Detecting ConditionTrouble Area
P0796The gear required by the ECM does not match the actual gear
when driving (2-trip detection logic)

Shift solenoid valve SL3 remains open or closed

Valve body is blocked

Shift solenoid valve SL3

Automatic transaxle (clutch, brake or gear etc.)

ECM
MONITOR DESCRIPTION
The ECM commands gear shifts by turning the shift solenoid valves ºON/OFFº. According to the input shaft
revolution, intermediate (counter) shaft revolution and output shaft revolution, the ECM detects the actual
gear position (1st, 2nd, 3rd, 4th or 5th gear position). When the gear position commanded by the ECM and
the actual gear position are not same, the ECM illuminates the MIL and stores the DTC.
MONITOR STRATEGY
Related DTCs
P0796:
Shift solenoid valve SL3/OFF malfunction
Shift solenoid valve SL3/ON malfunction
Required sensors/ComponentsShift solenoid valve SL3, Speed sensor (NT), Speed sensor (NC), Crankshaft posi-
tion sensor (NE)
Frequency of operationContinuous
Duration
OFF malfunction (A)
0.8 sec.
OFF malfunction (B)
1 sec.
ON malfunction (A) and (B)
0.8 sec.
ON malfunction (C)
0.4 sec.
MIL operation2 driving cycles
Sequence of operationNone
05C15-12

05-1090- DIAGNOSTICSELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT] (U151E/U151F)
1280 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
TYPICAL ENABLING CONDITIONS
All:
Transmission rangeºDº
ECT (Engine coolant temperature)10C (50F) or more
TFT (Transmission fluid temperature)-20C (-4F) or more
TFT sensor circuitNot circuit malfunction
ECT sensor circuitNot circuit malfunction
Turbine speed sensor circuitNot circuit malfunction
Intermediate shaft speed sensor circuitNot circuit malfunction
Output speed sensor circuitNot circuit malfunction
Shift solenoid valve SL1 circuitNot circuit malfunction
Shift solenoid valve SL2 circuitNot circuit malfunction
Shift solenoid valve SL3 circuitNot circuit malfunction
Shift solenoid valve S4 circuitNot circuit malfunction
Shift solenoid valve SR circuitNot circuit malfunction
Shift solenoid valve DSL circuitNot circuit malfunction
OFF malfunction (A)
ECM selected gear4th or 5th
Throttle valve opening angle4.5% or more at engine speed 1,900 rpm
(Varies with engine speed)
OFF malfunction (B)
ECM selected gear4th
Throttle valve opening angle5% or more
Vehicle speed10 km/h (6.2 mph) or more
ON malfunction (A)
ECM selected gear1st
Vehicle speedLess than 40 km/h (24.9 mph)
Throttle valve opening angle4.5% or more at engine speed 1,900 rpm
(Varies with engine speed)
ON malfunction (B)
ECM selected gear3rd
Throttle valve opening angle7.0% or more at output speed 1,400 rpm
(Varies with engine speed)
Malfunction of pressure control solenoid ºBº (SL2) and ºCº
(SL3)Not detected
ON malfunction (C)
Throttle valve opening angle7.0% or more at output speed 1,050 rpm
(Varies with engine speed)
Malfunction of pressure control solenoid ºBº (SL2)Not detected

- DIAGNOSTICSELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT] (U151E/U151F)05-1091
1281 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
TYPICAL MALFUNCTION THRESHOLDS
Either of the following conditions is met:
OFF malfunction (A) and (B), or ON malfunctions (A), (B) and (C)
2 detections are necessary per driving cycle:
1st detection; temporary flag ON
2nd detection; pending fault code ON
OFF malfunction (A)
Input (turbine) speed/Intermediate shaft speed0.93 to 1.07
OFF malfunction (B)
Intermediate shaft speed/Output speed1.02 to 1.16
ON malfunction (A)
Input (turbine) speed/Intermediate shaft speed0.93 to 1.07
ON malfunction (B)
Input (turbine) speed - Intermediate shaft speed700 rpm or more
ON malfunction (C)
Input (turbine) speed - Intermediate shaft speed
Less than -500 rpm
or
700 rpm or more

05-1092- DIAGNOSTICSELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT] (U151E/U151F)
1282 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
INSPECTION PROCEDURE
HINT:
Performing the ACTIVE TEST using the hand-held tester allows the relay, VSV, actuator and so on to oper-
ate without parts removal. Performing the ACTIVE TEST as the first step of troubleshooting is one method
to shorten labor time.
It is possible to display the DATA LIST during the ACTIVE TEST.
(a) Turn the ignition switch off.
(b) Connect the hand-held tester to the DLC3.
(c) Turn the ignition switch to the ON position.
(d) Push the ºONº button of the hand-held tester.
(e) Select the item ºDIAGNOSIS/ENHANCED OBD II/ACTIVE TEST/SHIFTº.
(f) According to the display on tester, perform the ºACTIVE TESTº.
HINT:
While driving, the shift position can be forcibly changed with the hand-held tester.
Comparing the shift position commanded by the ACTIVE TEST with the actual shift position enables you
to confirm the problem (see page 05-1030).
ItemTest DetailsDiagnostic Note
SHIFT
[Test Details]
Operate the shift solenoid valve and set the each shift position by your-
self.
[Vehicle Condition]
Less than 50 km/h (31 mph)
[Others]

Press º"º button: Shift up

Press ºuº button: Shift down
Possible to check the operation of
the shift solenoid valves.
HINT:

This test can be conducted when the vehicle speed is 50 km/h (31 mph) or less.

The shift position commanded by the ECM is shown in the DATA LIST/SHIFT display on the hand-held
tester.
1 CHECK OTHER DTCS OUTPUT(IN ADDITION TO DTC P0796)
(a) Connect the OBD II scan tool or the hand-held tester to the DLC3.
(b) Turn the ignition switch to the ON position and push the OBD II scan tool or the hand-held tester main
switch ON.
(c) When you use hand-held tester:
Select the item ºDIAGNOSIS/ENHANCED OBD II/DTC INFO/CURRENT CODESº.
(d) Read the DTCs using the OBD II scan tool or the hand-held tester.
Result:
Display (DTC output)Proceed to
Only ºP0796º is outputA
ºP0796º and other DTCsB
HINT:
If any other codes besides ºP0796º is output, perform the troubleshooting for those DTCs first.
B GO TO RELEVANT DTC CHART
(SEE PAGE 05-1034)
A

G20767
2
1
(+)
(-)
2 1 Shift Solenoid Valve SL3:
- DIAGNOSTICSELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT] (U151E/U151F)05-1093
1283 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
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:
Tester ConnectionSpecified Condition
20C (68F)
1 - 25.0 to 5.6 W
(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 an operating noise.
NG REPLACE SHIFT SOLENOID VALVE(SL3)
OK
3 INSPECT TRANSMISSION VALVE BODY ASSY(See chapter 2 in the problem
symptoms table)
(SEE PAGE 05-1016)
OK:
There are no foreign objects on each valve and they operate smoothly.
NG REPAIR OR REPLACE TRANSMISSION VALVE
BODY ASSY (SEE PAGE 40-44)
OK
4 INSPECT TORQUE CONVERTER CLUTCH ASSY (SEE PAGE 40-29)
OK:
The torque converter clutch operates normally.
NG REPLACE TORQUE CONVERTER CLUTCH
ASSY
OK
REPAIR OR REPLACE AUTOMATIC TRANSAXLE ASSY (SEE PAGE 40-18)

05-1094- DIAGNOSTICSELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT] (U151E/U151F)
1284 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
DTC P0798 PRESSURE CONTROL SOLENOID ºCº
ELECTRICAL (SHIFT SOLENOID VALVE
SL3)
CIRCUIT DESCRIPTION
Shifting from 1st to 5th is performed in combination with ºONº and ºOFFº operation of the shift solenoid valves
SL1, SL2, SL3, S4 and SR which is controlled by the ECM. If an open or short circuit occurs in either of the
shift solenoid valves, the ECM controls the remaining normal shift solenoid valve to allow the vehicle to be
operated smoothly (Fail safe function).
DTC No.DTC Detection ConditionTrouble Area
P0798
ECM checks for an open or short circuit in shift solenoid valves
SL3 (1-trip detection logic)

Output signal duty equals to 100%
Open or short in shift solenoid valve SL3 circuit

Shift solenoid valve SL3

ECM
MONITOR DESCRIPTION
The ECM commands gear shifts by turning the shift solenoid valves ºON/OFFº. 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 shift solenoid valves in good
condition ºON/OFFº (In case of an open or short circuit, the ECM stops sending current to the circuit.)
(see page 05-1030).
MONITOR STRATEGY
Related DTCsP0798: Shift solenoid valve SL3/Range check
Required sensors/ComponentsShift solenoid valve SL3
Frequency of operationContinuous
Duration1 sec.
MIL operationImmediate
Sequence of operationNone
TYPICAL ENABLING CONDITIONS
The monitor will run whenever this DTC is not present.See page 05-1007
Battery voltage10 V or more
Ignition switchON
StarterOFF
TYPICAL MALFUNCTION THRESHOLDS
Output signal duty100%
COMPONENT OPERATING RANGE
Output signal dutyLess than 100%
05C16-22

G31765
Electronically Controlled
Transmission Solenoid
E8ECM
E8 G-B
G-R17
16SL3+
SL3- 4
11 R
L E1
SL3+
SL3-+B
CPU
G26426
Transmission Wire Side:
(Connector Front View):
SL3- SL3+
E1
- DIAGNOSTICSELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT] (U151E/U151F)05-1095
1285 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
WIRING DIAGRAM
INSPECTION PROCEDURE
1 INSPECT TRANSMISSION WIRE(SL3)
(a) Disconnect the transmission wire connector from the
transaxle.
(b) Measure the resistance according to the value(s) in the
table below.
Standard:
Tester ConnectionSpecified Condition
20C (68F)
4 (SL3+) - 11 (SL3-)5.0 to 5.6 W
(c) Measure the resistance according to the value(s) in the
table below.
Standard (Check for short):
Tester ConnectionSpecified Condition
4 (SL3+) - Body ground10 kW or higher
11 (SL3-) - Body ground=
NG Go to step 3
OK

C82158C91565SL3+
SL3-
E7E8E9E6E5
ECM:
G20767
2
1
(+)
(-)
2 1 Shift Solenoid Valve SL3:
05-1096- DIAGNOSTICSELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT] (U151E/U151F)
1286 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
2 CHECK HARNESS AND CONNECTOR(TRANSMISSION WIRE - ECM)
(a) Connect the transmission connector to the transaxle.
(b) Disconnect the connector from the ECM.
(c) Measure the resistance according to the value(s) in the
table below.
Standard:
Tester ConnectionSpecified Condition
20C (68F)
E8 - 17 (SL3+) - E8 - 16 (SL3-)5.0 to 5.6 W
(d) Measure the resistance according to the value(s) in the
table below.
Standard (Check for short):
Tester ConnectionSpecified Condition
E8 - 17 (SL3+) - Body ground10 kW or higher
E8 - 16 (SL3-) - Body ground=
NG REPAIR OR REPLACE HARNESS OR
CONNECTOR (SEE PAGE 01-36)
OK
REPLACE ECM (SEE PAGE 10-24)
3 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:
Tester ConnectionSpecified Condition
20C (68F)
1 - 25.0 to 5.6 W
(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 an operating noise.
NG REPLACE SHIFT SOLENOID VALVE(SL3)
OK
REPAIR OR REPLACE TRANSMISSION WIRE (SEE PAGE 40-37)