Actron CP9087 Service Manual page 39

Manifold Absolute Pressure MAP/BARO
YST
HVAC
CRUISE
CE BOOSTER
EGR
G GAP
VAC
BRAKE BOOSTER
REG
FUEL
PRESS
U.S.A. REG.
EGR
VAC
REG
EM
12RAC8
• Note: If the TEST light is OFF a problem
exists. Go to step 9 and continue testing to find
cause.
8) Operate sensor - Watch TEST light for
results.
(Note: Ignore any PULSE light action.)
Non-Turbo Engines only: Start engine and let
idle.
Turbo Engines only: Attach hand vacuum
pump to sensor vacuum port. Apply 18 in.
vacuum. (More than 25 in. vacuum may damage
sensor.)
Good Sensor
– TEST light moves downward during engine idle
or when vacuum applied. (The TEST light may
go off if it moves to the bottom of the column -
this is O.K.)
– Range of TEST light movement varies with
sensor type and applied vacuum.
– Note: if test results are O.K. but a computer
trouble code indicates a bad sensor signal, the
wire between the sensor signal pin and the
computer may be open.
– Testing is complete.
Problem exists (Bad sensor or wiring)
– TEST light position does not change during test.
– Go to step 9 and continue testing to find cause.
Do all steps to avoid replacing a good sensor!
9) Ignition key OFF.
10) Check MAP sensor vacuum hose for...
• Correct hook-up.
• Pinches, kinks or collapsed sides.
TO TRANS
MODE
• Splits, cuts, breaks or clogs
FRONT
OF CAR
Repair as necessary, then retest. If no
trouble found, go to next step.
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