Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Component Inspection
- CHECK MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR-1
- Turn ignition switch OFF.
- Start engine and warm it up to normal operating temperature.
- Turn ignition switch OFF, wait at least 5 seconds and then turn ON.
- Check the voltage between ECM harness connector terminals as follows.
ECM
Connector
Terminal
F24
52
49
NOTE:- To avoid the influence of intake manifold vacuum, check the voltage 1 or more minutes past after engine is stopped.
- Because the sensor is absolute pressure sensor, output value may differ depending on atmospheric pressure and altitude.
- Measure the atmospheric pressure.NOTE: As the atmospheric pressure described on the synoptic chart is the value at sea level, compensate the pressure with the following chart.
Altitude (m)
Compensated pressure (hPa)
0
0
200
-24
400
-47
600
-70
800
-92
1000
-114
1500
-168
2000
-218
- Check the manifold absolute pressure sensor value corresponding to the atmospheric pressure.
Atmospheric pressure (hPa)
Voltage (V)
800
3.1 - 3.7
850
3.3 - 3.9
900
3.5 - 4.1
950
3.8 - 4.3
1000
4.0 - 4.6
1050
4.2 - 4.8
Is the inspection result normal?
YES
GO TO 2.
NO
Replace MAP sensor. Refer to Removal and Installation .
- CHECK MAP SENSOR-2
- Start engine and let it idle.
- Check intake manifold vacuum.
- Check the voltage between ECM harness connector terminals as follows.
ECM
Connector
Terminal
F24
52
49
- Confirm the difference of the voltage when engine is stopped and at idling is within the values shown in the following chart.
Intake manifold vacuum [kPa (mm Hg)]
Voltage difference
-40 (-300)
1.5 - 2.0 V
-53.3 (-400)
2.0 - 2.6 V
-66.7 (-500)
2.6 - 3.2 V
-80 (-600)
3.2 - 3.8 V
Is the inspection result normal?
YES
INSPECTION END
NO
Replace MAP sensor. Refer to Removal and Installation .
Use the Manual With the Right Hardware
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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