2-11
THROTTLE POSITION Sensor/Switch
7) Honda only: 1988-92 Civic and CRX
– 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.
8) Set RANGE switch to HIGH.
9) Set FUNCTION switch to VOLTS.
10) Operate sensor - Watch TEST light for results.
(Note: TEST light may be on or off before sensor is
operated.)
On-Car test: Slowly move throttle linkage back and forth from
idle to wide open position.
Off-Car test: Slowly rotate sensor element back and forth
from end to end.
• Good Sensor
- TEST light smoothly moves up or down as
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.
• Bad Sensor
- TEST light position does not change during
test OR light movement is erratic, showing a sudden jump
or dip during smooth sensor operation.
11) Testing is complete.
Set RANGE switch to POWER OFF and remove all test
leads.
RANGE
HIGH
LOW
POWER OFF
FUNCTION
VOLTS
OHMS
FREQUENCY
Summary of Contents for CP9087
Page 82: ...3 22 Notes...
