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DI-701
DIAGNOSTICS - ENGINE (2UZ-FE)
DIDRR-01
DTC P0500 Vehicle Speed Sensor "A"
DTC P0503 Vehicle Speed Sensor "A" Intermittent/Errat-
ic/High
CIRCUIT DESCRIPTION
The No.1 vehicle speed sensor outputs a 4-pulse signal for every revolution of the rotor shaft, which is ro-
tated by the transmission output shaft via the driven gear. After this signal is converted into a more precise
rectangular waveform by the waveform shaping circuit inside the combination meter, it is then transmitted
to the ECM. The ECM determines the vehicle speed based on the frequency of these pulse signals.
4-pulse 4-pulse
Vehicle Speed Combination ECM
Sensor Meter
P22487
DTC No. Proceed to DTC Detection Condition Trouble Area
No vehicle speed sensor sig-
nal to ECM under following
P0500 Step 1 conditions: (2 trip detection S Combination meter
logic) S Open or short in vehicle speed sensor circuit
S Vehicle is being driven S Vehicle speed sensor
S ECM
Intermittent problem in the ve-
P0503 DI-430
hicle speed sensor circuit
MONITOR DESCRIPTION
The ECM assumes that the vehicle is driven when the park/neutral position switch is OFF and it has been
over 4 sec. since the actual vehicle speed was 5.59 mph (9 km/h) or more.
If there is no signal from the vehicle speed sensor when these conditions are satisfied, the ECM concludes
that there is a fault in the vehicle speed sensor. The ECM will turn on the MIL and a DTC is set.
DI-702
DIAGNOSTICS - ENGINE (2UZ-FE)
MONITOR STRATEGY
Related DTCs P0500 Vehicle speed sensor "A" pulse input error
Main sensors Vehicle speed sensor
Required sensors/components Park/Neutral position switch, Engine coolant tem-
Related sensors
perature sensor, Combination meter
Frequency of operation Continuous
Duration 500 times
MIL operation Immediate
Sequence of operation None
TYPICAL ENABLING CONDITIONS
Specification
Item
It
Minimum Maximum
The monitor will run whenever this DTC is
See page DI-437
not present
Vehicle speed is 5.59 mph (9 km/h) or
4 sec. -
more
Park/neutral position switch OFF
TYPICAL MALFUNCTION THRESHOLDS
Detection Criteria Threshold
Sensor signal No pulse input
WIRING DIAGRAM
Access Cab, Standard Cab:
ECM
C11
Combination Meter
25
H H 8 SPD
G-O G-O
J66 J66 E4
A23570
DI-703
DIAGNOSTICS - ENGINE (2UZ-FE)
Double Cab:
ECM
C11
Combination Meter
25
D D 8 SPD
G-O G-O
J49 J49 E4
A23570
INSPECTION PROCEDURE
HINT:
Read freeze frame data using the hand-held tester. Freeze frame data records the engine conditions when
a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was
running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, as well as other
data from the time when a malfunction occurred.
1 Check operation of speedometer.
PREPARATION:
(a) Connect the hand-held tester to the DLC3.
(b) Turn the ignition switch to ON and push the hand-held tester main switch ON.
(c) Start the engine.
(d) When using hand-held tester, enter the following menu: DIAGNOSIS / ENHANCED OBD II / DATA
LIST / PRIMARY / VEHICLE SPD.
CHECK:
Read the mass air flow rate on the hand-held tester.
RESULT:
Vehicle speed Proceed to
Vehicle speed remains 0 km/h (0 mph) A
Vehicle speed is lower than actual speed A
Vehicle speed is same as actual speed B
B Check for intermittent problems
(See page DI-430).
A
DI-704
DIAGNOSTICS - ENGINE (2UZ-FE)
2 Check voltage between terminal SPD and E1 of ECM connector.
PREPARATION:
(a) Shift the shift lever to neutral.
E5 E4 (b) Jack up the rear wheel on one side.
(c) Turn the ignition switch ON.
CHECK:
Measure the voltage between the specified terminal of the E4
E1 and E5 ECM connector when the wheel is turned slowly.
SPD(+)
OK:
B17411 Standard:
Tester Connection Specified Condition
4 to 6 V SPD (E4-8) - E1 (E5-1) Generated intermittently
HINT:
The output voltage should fluctuate up and down similarly to the
diagram on the left when the wheel is turned slowly.
Turn the Wheel OK Replace ECM (See page SF-82).
AT7809
NG
3 Check vehicle speed sensor.
PREPARATION:
Component Side Connector:
(a) Disconnect the vehicle speed sensor connector.
(b) Connect the battery positive (+) lead to terminal 1 and the
battery negative (-) lead to terminal 2.
3 2 1 (c) Connect the tester positive (+) lead to terminal 3 and the
tester negative (-) lead to terminal 2.
(d) Shift the shift lever to N position.
Vehicle Speed Sensor (e) Rotate the shaft.
I25536 CHECK:
Check that there is voltage change between terminals 2 and 3.
OK:
Standard: 0 V to 10 V or more
NG Replace vehicle speed sensor.
OK
DI-705
DIAGNOSTICS - ENGINE (2UZ-FE)
4 Check sensor installation (Vehicle speed sensor).
CHECK:
Check the vehicle speed sensor installation.
OK:
The vehicle speed sensor is installed properly.
Clearance
OK NG NG Tighten sensor installation bolt.
BR3795
OK
5 Check for open and short in harness and connector between combination meter
and ECM.
PREPARATION:
(a) Disconnect the C11 combination meter connector.
E4 (b) Disconnect the E4 ECM connector.
CHECK:
Check for resistance between the wire harness side connec-
tors.
OK:
SPD(+)
Standard (Check for open):
B17411 Symbols (Terminal No.) Specified condition
SPD (E4-8) - C11-23 Below 1
Wire Harness Side: Standard (Check for short):
Front View Symbols (Terminal No.) Specified condition
C11
SPD (E4-8) or C11-23 - Body ground 10 k or higher
Combination Meter Connector
A23540
NG Repair or replace harness or connector.
OK
Check combination meter circuit (See page
BE-86).
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