Testing Sensors; Troubleshooting Tips - Actron CP9087 Service Manual

Section 2
Section
2
Troubleshooting
Tips
YST
HVAC
CRUISE
CE BOOSTER
EGR
G GAP
VAC
BRAKE BOOSTER
REG
FUEL
PRESS
U.S.A. REG.
EGR
VAC
REG
EM
12RAC8

Testing Sensors

Save yourself time! Always begin with a thorough
visual and "hands-on" inspection. You can often
find the cause of many problems by just looking.
• Has the vehicle been serviced recently?
Sometimes things get reconnected in the wrong
place, or not at all.
• Don't take shortcuts. Inspect hoses and wiring
which may be difficult to see due to location.
• Inspect the air cleaner and ductwork for defects.
• Check sensors and actuators for damage.
• Inspect all vacuum hoses for:
– Correct routing. Refer to vehicle service
manual, or Vehicle Emission Control Information
TO TRANS
MODE
(VECI) decal located in the engine compartment.
FRONT
OF CAR
– Pinches and kinks.
– Splits, cuts or breaks.
• Inspect wiring for:
– Contact with sharp edges (this happens often).
– Contact with hot surfaces, such as exhaust
manifolds.
– Pinched, burned or chafed insulation.
– Proper routing and connections.
• Check electrical connectors for:
– Corrosion on pins.
– Bent or damaged pins.
– Contacts not properly seated in housing.
– Bad wire crimps to terminals.
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