Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Toyota Sienna 2004-2007 Approved SRM 04 05 2011n cip0793
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DIAGNOSTICS - ELECTRONIC CONTROLLED AUTOMATIC 05-619
TRANSAXLE [ECT] 05NPF-01
DTC P0793 INTERMEDIATE SHAFT SPEED SENSOR
"A"
CIRCUIT DESCRIPTION
This sensor detects the rotation speed of the counter gear. By comparing the counter gear speed signal (NC)
with the direct clutch speed sensor signal (NT), the ECM detects the shift timing of the gears and appropriate-
ly controls the engine torque and hydraulic pressure according to various conditions. Thus smooth gear shift-
ing is performed.
DTC No. DTC Detection Condition Trouble Area
ECM detects conditions (a), (b) and (c) continuity for 5 sec. or
S Open or short in transmission revolution sensor NC (speed
more: (1-trip detection logic)
sensor NC) circuit
P0793 (a) Vehicle speed: 50 km/h (31 mph) or more
S Transmission revolution sensor NC (speed sensor NC)
(b) Park/neutral position switch (NSW) is OFF
S ECM
(c) Speed sensor (NC): less than 300 rpm
Reference (Using an oscilloscope):
1 V/DIV
Check the waveform between the terminals NC+ and
NC- of the ECM connector.
Standard: Refer to the illustration.
Terminal NC+ - NC-
Tool setting 1V/DIV, 1ms/DIV
Vehicle speed 30 km/h (19 mph): (3rd gear)
Vehicle condition
Engine speed 1,400 rpm
1 ms/DIV
C93866
MONITOR DESCRIPTION
The NC terminal of ECM detects a revolution signal from the speed sensor (NC) (counter gear rpm). The
ECM calculates a gearshift comparing the speed sensor (NT) with the speed sensor (NC).
While the vehicle is operating in 2nd, 3rd, 4th or 5th gear in the shift position of D, if the counter gear revolu-
tion is less than 300 rpm*1 although the output shaft revolution is more than 1,000 rpm*2, the ECM detects
the trouble, illuminates the MIL and stores the DTC.
*1: Pulse is not output or is irregularly output.
*2: The vehicle speed is 50 km/h (31 mph) or more.
MONITOR STRATEGY
Related DTCs P0793: Speed sensor (NC)/Verify pulse input
Required sensors/Components Speed sensor (NC), Speed sensor (NT), Park/neutral position switch
Frequency of operation Continuous
Duration 5 sec.
MIL operation Immediate
Sequence of operation None
TYPICAL ENABLING CONDITIONS
The monitor will run whenever this DTC is not present. See page 05-9
Engine Running
NSW switch OFF
Output shaft rpm 1,000 rpm or more
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 802
05-620 DIAGNOSTICS - ELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT]
TYPICAL MALFUNCTION THRESHOLDS
Sensor signal rpm Less than 300 rpm
COMPONENT OPERATING RANGE
[HINT]
Counter gear speed sensor (NC) 3rd when shift lever position is D position (After warming up the engine);
S Intermediate shaft speed (NC) becomes close to the engine speed.
WIRING DIAGRAM
ECM
C4
Counter Gear Speed Sensor 26
R
E7 NC+
1 2
34
W-G
E7 NC-
C93635
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 "ON" button of the OBD II scan tool or the hand-held tester.
(f) When you use hand-held tester:
Select the item "DIAGNOSIS/ENHANCED OBD II/DATA LIST".
(g) According to the display on tester, read the "DATA LIST".
Measurement Item/
Item Normal Condition
Range (display)
[HINT]
3rd when shift lever position is D position (After
Counter Gear Speed/
SPD (NC) warming up the engine);
display: 50 r/min
S Intermediate shaft speed (NC) becomes close
to the engine speed.
HINT:
S SPD (NC) is always 0 while driving:
Open or short in the sensor or circuit.
S 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.
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 803
DIAGNOSTICS - ELECTRONIC CONTROLLED AUTOMATIC 05-621
TRANSAXLE [ECT]
1 INSPECT SPEED SENSOR(NC)
(a) Disconnect the speed sensor connector from the trans-
axle.
(b) Measure the resistance between terminals of speed sen-
sor.
OK:
Resistance:
TOYOTA made: 500 to 620 at 20 _C (68 _F)
AISIN made: 560 to 680 at 20 _C (68 _F)
C58536
NG REPLACE SPEED SENSOR(NC)
(See page 40-20 )
OK
2 CHECK HARNESS AND CONNECTOR(SPEED SENSOR - ECM)
(a) Connect the speed sensor connector.
E8 E7 E6 E5 E4 (b) Disconnect the ECM connector.
(c) Measure the resistance between terminals NC+ and
NC-.
OK:
NC+ Resistance:
TOYOTA made: 500 to 620 at 20 _C (68 _F)
NC- AISIN made: 560 to 680 at 20 _C (68 _F)
C82158 C91565 (d) Check the continuity between the wire harness side con-
nectors.
OK:
Standard (Check for short):
Symbols Specified condition
NC+ - Body ground
No continuity
NC- - Body ground
NG REPAIR OR REPLACE HARNESS OR
CONNECTOR(See page 01-37 )
OK
CHECK AND REPLACE ECM(See page 01-37 )
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 804
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