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Testing Sensors
Section
2
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