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Step 2
1) Connect the lAP sensor coupler.
2) Insert the needle pointed probes to the lead wire coupler.
Start the engine at idle speed.
3) Measure the lAP sensor output voltage at the wire side cou-
pler (between G/B and B/Br wires).
_ lAP
sensor
output
voltage: Approx. 2.6 V at idle
speed
(ffi GIB - 8 B/Br)
'T'OOti
09900·25008: Multi
circuit
tester set
09900-25009: Needle pointed probe set
~
Tester
knob
indication: Voltage
(:-::-::)
YES Go to Step 3.
• Check the vacuum hose for crack or damage.
NO
• Open or short circuit in the G/B wire.
•
Replace the lAP sensor with a new one.
FI
SYSTEM
DIAGNOSIS
4-31
Step 3
1) Remove the lAP sensor.
2) Connect the vacuum pump gauge to the vacuum port of the
lAP sensor.
Arrange 3 new 1.5 V batteries in series (check that total volt-
age is 4.5 - 5.0 V) and connect 8 terminal to the ground ter-
minal and ffi terminal to the Vcc terminal.
Check the voltage between Vout and ground. Also, check if
voltage reduces when vacuum is applied up to 400 mmHg by
using vacuum pump gauge. (c::::T4-32)
.rUt.
09917-47010: Vacuum
pump
gauge
09900-25008: Multi
circuit
tester set
~
Tester
knob
indication: Voltage
(:-::-::)
Is the voltage OK?
•
Red, G/B or B/Br wire open or shorted to
ground, or poor @,
~
or
®J
connection.
•
If wire and connection are OK, intermittent trou-
YES
ble or faulty ECM.
•
Recheck each terminal and wire harness for
open circuit and poor connection.
NO
If check result is not satisfactory, replace lAP sen-
sor with a new one.
3
~
~
ECM couplers