Actron CP9087 Service Manual page 19

THROTTLE POSITION Sensor/Switch
7) Honda only: 1988-92 Civic and CRX
HIGH
LOW
POWER OFF
8) Set RANGE switch to HIGH.
RANGE
VOLTS
9) Set FUNCTION switch to VOLTS.
OHMS
FREQUENCY
10) Operate sensor - Watch TEST light for results.
FUNCTION
On-Car test: Slowly move throttle linkage back and forth from
Off-Car test: Slowly rotate sensor element back and forth
• Good Sensor - TEST light smoothly moves up or down as
• Bad Sensor - TEST light position does not change during
11) Testing is complete.
– Remove vacuum hose from dashpot diaphragm.
– Apply 20 in. Hg to the dashpot diaphragm using a hand
vacuum pump.
– The dashpot diaphragm is part of the throttle body
assembly. It is used to control cold engine fast idle and
throttle closure speed so engine will not stall.
(Note: TEST light may be on or off before sensor is
operated.)
idle to wide open position.
from end to end.
sensor is operated. (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 vehicle
mounting.
test OR light movement is erratic, showing a sudden jump
or dip during smooth sensor operation.
Set RANGE switch to POWER OFF and remove all test
leads.
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