MPI – Troubleshooting
13-12
Code No. 24 Vehicles speed sensor system Probable cause
Range of check
D Ignition switch: ON
D Excluding 60 seconds after the ignition switch is turned to ON or immediately
after the engine starts.
D Idle position switch: OFF
D Engine speed is 3,000 r/min or more.
D Driving under high engine load conditions.
Set conditions
D Sensor output voltage does not change for 4 seconds (no pulse signal input).
D Malfunction of the vehicle speed sensor
D Improper connector contact, open circuit or
short-circuited harness wire of the vehicle speed
sensor circuit
D Malfunction of the engine-ECU
OK
Check the ignition switch. (Refer to GROUP 54 – Ignition Switch.)
2. NG
OK
Replace the engine-ECU.
3. NG
OK
Replace the engine-ECU.
NG
Check the harness wire
between the engine-ECU
and the vehicle speed
sensor connector.
NG
Repair
OK
Check trouble symptom.
OK
Check the following
connectors:
A-19, B-62
NG
Repair
NG
Check the harness wire
between the engine-ECU
and the vehicle speed
sensor connector.
NG
Repair
OK
Check trouble symptom.
Check the following
connector:
B-62
NG
Repair
NG
Check the harness wire
between the vehicle
speed sensor and ignition
switch connector.
NG
Repair
OK
Check trouble symptom.
OK
Measure at the vehicle speed sensor connector A-19.
D Disconnect the connector, and measure at the harness side.
1. Voltage between 1 and earth (Ignition switch: ON)
OK: System voltage
2. Voltage between 3 and earth (Ignition switch: ON)
OK: 4.8 – 5.2 V
3. Continuity between 2 and earth
OK: Continuity
1. NG
Check the following
connectors:
B-64, B-74, B-76
NG
Repair
Check the vehicle speed sensor. (Refer to GROUP 54 – Combina-
tion Meters.)
NG
Replace
Check the harness wire between the vehicle speed sensor and
the earth, and repair if necessary.
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