Actron CP9087 - Manual (Page 41)

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Manifold Absolute Pressure MAP/BARO
14) Check MAP signal wire for short to ground.
•Verify ignition key OFF and MAP sensor wiring
harness disconnected.
• RANGE on LOW.
• FUNCTION on OHMS.
• YELLOW test lead to MAP signal pin on
vehicle harness connector.
• BLACK test lead to good vehicle GROUND.
Good circuit (no short): TEST light ON in any
position.
Go to next step.
Bad circuit (shorted): TEST light OFF.
Repair short in signal circuit wiring, then retest.
15) Testing is complete.
Verify ignition key OFF. Set RANGE switch to
POWER OFF and remove all test leads.
If steps 10 through 14 are all good (but step 8
showed a problem) then the sensor is bad and
needs to be replaced.
RANGE
HIGH
LOW
POWER OFF
FUNCTION
VOLTS
OHMS
FREQUENCY