12-33 FI SYSTEM DIAGNOSIS
Step 3
1) Remove the throttle body. ("13-8)
2) Remove the IAP sensor. ("13-10)
3) Connect the vacuum pump gauge to the vacuum port of the
IAP sensor.
4) Arrange 3 new 1.5 V batteries in series
1 (check that total -
voltage is 4.5 – 5.0 V) and connect
- terminal to the ground -
terminal
2 and
+ terminal to the VCC terminal
3.
5) Check the voltage between Vout
4 and ground. Also, check
if voltage reduces when vacuum is applied by using vacuum
pump gauge.
! 09917-47011: Vacuum pump gauge
09900-25008: Multi-circuit tester set
% Tester knob indication: Voltage (&)
Is the voltage OK?
Output voltage
(VCC voltage 4.5 – 5.0 V, ambient temp. 25 °C, 77 °F)
YES
• G/B, R/Bl or B/Br wire open or shorted to
ground, or poor
6,
C or
N connection.
• If wire and connection are OK, intermittent trou-
ble or faulty ECM.
• Recheck each terminal and wire harness for
open circuit and poor connection.
• Replace the ECM with a known good one, and
inspect it again.
NO
If check result is not satisfactory, replace the IAP
sensor with a new one.
ATMOSPHERIC
PRESSURE
OUTPUT
VOLTAGE
(mmHg) kPa (V)
760 100 Approx. 2.86
707 94 Approx. 2.70
634 85 Approx. 2.45
567 76 Approx. 2.21
526 70 Approx. 2.05
ECM coupler (Harness side)
3
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