Sensor Tester Service Manual

2-30

Testing Sensors

Section

Manifold Absolute Pressure (MAP) Sensor

Test Procedure

Testing is done on-vehicle.

Warning: This test involves running the engine. Observe all safety

precautions (see page ii). Work in well-ventilated area.

1) Verify ignition key is OFF.

2) Check Tester battery

Refer to page 1-4. Set RANGE switch to POWER

OFF when done.

3) Connect test leads.

Keep sensor connected to vehicle wiring.

• YELLOW to sensor SIGNAL circuit. Use

backprobe adapter.

• BLACK to good vehicle GROUND.

4) Verify test clips make good contact.

Make sure unused clips are not touching any-

thing.

5) Set switches:

• RANGE on HIGH.

• FUNCTION on VOLTS.

Exception:

Ford vehicles with frequency type sensor (see

diagram).

– RANGE on LOW.

– FUNCTION on FREQUENCY.

6) Turn ignition key ON but DO NOT START

ENGINE.

7) Note TEST light position on tester.

• If the sensor is good, the light will move

downwards when vacuum is applied.

Backprobe

Yellow