Actron CP9087 Service Manual page 46

Actron sensor tester service manual
Table of Contents

Advertisement

Section 2
HIGH
LOW
POWER OFF
RANGE
VOLTS
OHMS
FREQUENCY
FUNCTION
TEST
2-38
Testing Sensors
– 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!
– Note: Sensor is defective if TEST light jumps
erratically when sensor GENTLY tapped with
lightweight tool.
9) Ignition key OFF.
10) Check for air intake problems.
• Air leaks - around MAF sensor, ductwork or
throttle body.
• Obstructions in air duct.
• Clogged air filter.
Repair as necessary, then retest. If no trouble
found, go to next step.
11) Check MAF sensor power circuit.
Keep sensor connected to vehicle wiring.
• YELLOW test lead to sensor POWER circuit.
Use backprobe adapter.
• BLACK test lead to good vehicle GROUND.
• RANGE on HIGH.
• FUNCTION on VOLTS.
• Ignition key ON.
Good power circuit: Top (or next to top) TEST
light ON.
Go to next step.
Bad power circuit: TEST light OFF or not in top
(or next to top) position.
Repair open or short in power circuit wiring, then
retest.

Hide quick links:

Advertisement

Table of Contents
loading

Table of Contents