4-wire MAP sensor and its faults

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In this article the room how to perform electrical tests on a 4-wire MAP sensor and its faults.

The 4-wire MAP sensor and its flaws

Hi there, today I am going to talk about the 4-wire MAP sensor. This has 4 cables because inside it has an additional sensor to the pressure which is the air temperature. Then the pressure sensor behaves the same as the three-wire one, that is, as the vacuum in the intake manifold increases, the voltage of the MAP sensor decreases proportionally. Also, as the vacuum decreases, the MAP sensor voltage increases proportionally.

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In the PWM type, something similar happens, but it decreases or increases in the ignition cycle.

sensor map

How to test a 4-wire MAP sensor

It is quite simple.

Before testing any electrical component, inspect the wiring and connectors for damage.

Move the connectors to make sure they are firmly engaged.

When testing the sensor, use a high input impedance digital volt-ohmmeter. Insert the tester cables through the back of the connector. Do not disconnect the electrical harness.

Inspect the vacuum hose connections at the sensor and throttle body. Repair or replace the hoses if any of the hoses are cracking or if you notice that they are leaking.

For the next step, do not disconnect the sensor connector, it must remain plugged in.

See the following figure representing the sensor diagram:

diagrama Medir sensor map de 4 cables

Pressure side test

Make sure the sensor wiring connector is fully inserted into the sensor (loose connections can create trouble codes).

Check the MAP sensor output voltage by inserting the negative lead of the voltmeter into the back of terminal 1 and the positive test lead through the back of the terminal of the harness connector, station 4.

With the ignition switch in the ON position and the engine off, the pressure sensor output voltage should be 4-5 volts.

Start the engine and let it idle at normal operating temperature. The output voltage should drop to 1.5-2.1 volts.

If there is no voltage, do the following:

Test the MAP sensor supply voltage at sensor connector terminals 3 and 1 with the ignition ON. If there is no voltage try to see if there is a broken wire between the connector and the computer or ECM relay is operating.

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You can use an ohmmeter, to check the wiring harness between the connector and the computer. Repair the wire harness if you notice an open circuit or if infinite resistance is detected.

como medir sensor map 4 cables

Temperature side test

Remove the connector from the sensor and turn the ignition on.

Measure between terminals 1 and 2.5V must exist which is the reference voltage.

Turn the ignition key to the OFF position and reconnect the sensor.

Put the ignition back in the ON position and measure between 1 and 2. At 36 degrees outside air temperature there should be about 1.6V.

If there is no voltage, try to see if there is a broken wire between the connector and the computer or ECM relay is operating.

You can use an ohmmeter, to check the wiring harness between the connector and the computer. Repair the wire harness if you notice an open circuit or if infinite resistance is detected.

¿Do you have questions or concerns??

Questions or suggestions can use the form below and I will gladly answer them.

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Written by Dennis García.

Chica Mecánica

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Grade 
03/31/2020

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    4-wire MAP sensor and its faults

    4-wire MAP sensor and its faults

    In this article the room how to perform electrical tests on a 4-wire MAP sensor and its faults.

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