05–247

DIAGNOSTICS – SFI SYSTEM (April, 2003) 05DIR–01

DTC P0500 VEHICLE SPEED SENSOR ”A”

CIRCUIT DESCRIPTION
The vehicle equipped with ABS detects a vehicle speed using the stability control ECU and wheel speed
sensor. This sensor monitors a wheel rotation speed and sends the signal to the ECU.
The stability control ECU converts these wheel speed signals into a 4–pulse signal and outputs it to the ECM
via the combination meter.
The ECM determines the vehicle speed based on the frequency of these pulse signals.
In the vehicle without ABS, the No. 1 vehicle speed sensor outputs a 4–pulse signal for every revolution of
the rotor shaft, which is rotated by the transmission output shaft via the driven gear. After this signal is con-
verted 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 signal.
w/ ABS:

4–Pulse 4–Pulse

From Wheel Stability

Control ECM
Speed Sensor Combination
ECU
Meter

A79413

w/o ABS:

4–Pulse 4–Pulse

No.1 Vehicle
Speed Sensor

Combination Meter

ECM

Q00515

2004 COROLLA (RM1037U)

Author: Date: 412

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DIAGNOSTICS – SFI SYSTEM (April, 2003)

DTC No. DTC Detection Condition Trouble Area

The ECM detects following conditions simultaneously 500
times (2 trip detection logic):

Open or short in speed sensor circuit

No SP1 (speed sensor) signal while ECM detects SP2 (No. 2

Speed sensor
speed sensor) signal
P0500
Combination meter

Vehicle speed is 6 mph (9 km/h) or more for 4 seconds

ECM

Park/Neutral position switch is OFF (Shift lever is in other

Stability control ECU
than P and N positions)

Transfer is in other than N position

MONITOR DESCRIPTION
Equipped with ABS:
The ECM assumes that the vehicle is driven when the RPM of the transmission counter gear indicates more
than 300 rpm and it has been over 30 seconds since the park/neutral position switch was turned OFF. If there
is no signal from the vehicle speed sensor with these conditions 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.
Not equipped with ABS:
The ECM assumes that the vehicle is driven when the park/neutral position switch is OFF and it has been
over 4 seconds since the actual vehicle speed was 9 km/h or more.
If there is no signal from the vehicle speed sensor with these conditions 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.
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
w/ ABS: 2 seconds
Duration
w/o ABS: 8 seconds
MIL operation 2 driving cycles
Sequence of operation None

TYPICAL ENABLING CONDITIONS

Specification
Item
Minimum Maximum
The monitor will run whenever the follow-
See ”List of Disable a Monitor” (On page 05–25)
ing DTCs are not present
w/o ABS:
Engine coolant temperature 70 C –
Engine speed 2,000 rpm 5,000 rpm
Intake air amount per engine revolution 0.42 g/rev –
Fuel cut at high engine speed Not executing
w/ ABS:
Either of following condition is met (a) or (b)
(a) Following conditions are met 1 and 2
1. Engine coolant temperature 20C –
2. Time after park/neutralposition switch
10 seconds –
ON to OFF
(b) Following conditions are met 1 and 2
1. Engine coolant temperature – 20C
2. Time after park/neutral position switch
30 seconds –
ON to OFF

2004 COROLLA (RM1037U)

Author: Date: 413

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DIAGNOSTICS – SFI SYSTEM (April, 2003)

2650 rpm
Engine speed –
(vary with throttle opening angle)
2 seconds
(Intake air temperature is –10C or more)
Detection time on intake air temperature –
8 seconds
(Intake air temperature less than –10C )
Time after IG SW ON 3 seconds –

TYPICAL MALFUNCTION THRESHOLDS

Detection Criteria Threshold
Vehicle speed sensor signal No pulse input

WIRING DIAGRAM
C9 ECM
Combination Meter
Center J/B
8 9 17 SPD
10 V–W V–W
4C 4C E5

A84931

INSPECTION PROCEDURE
HINT:
Read freeze frame data using the hand−held tester or the OBD II scan tool. Freeze frame data records the
engine conditions when a malfunction is detected. When troubleshooting, it is useful for determining whether
the vehicle was running or stopped, the engine was warmed up or not, the air–fuel ratio was lean or rich,
etc. at the time of the malfunction.
1 CHECK OPERATION OF SPEEDOMETER

(a) Drive the vehicle and check if the operation of the speedometer in the combination meter is normal.
HINT:
The vehicle speed sensor is operating normally if the speedometer display is normal.
NG CHECK SPEEDOMETER CIRCUIT
(See page 05–640)

OK

2004 COROLLA (RM1037U)

Author: Date: 414

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DIAGNOSTICS – SFI SYSTEM (April, 2003)

2 INSPECT ECM(SPD VOLTAGE)

E1 (–) SPD (+) (a) Shift the lever to the neutral position.
E4
(b) Jack up the vehicle.
E5
(c) Turn the ignition switch ON.
(d) Check the voltage between the terminals of the E4 and E5
ECM connectors as the wheel is turned slowly.
Standard:
Tester Connection Specified Condition
SPD (E5–17) – E1 (E4–7) Voltage is generated intermittently
ECM Connector A18294

HINT:
The output voltage should fluctuate up and down similarly to the
4.5–5.5V
diagram on the left when the wheel is turned slowly.

0V
Turn Wheel NG REPAIR OR REPLACE HARNESS OR
A62954
CONNECTOR

OK

REPLACE ECM (See page 10–11)

2004 COROLLA (RM1037U)

Author: Date: 415