4-60 FI SYSTEM DIAGNOSIS
Step 3
1) Remove the AP sensor.
2) Connect the vacuum pump gauge to the vacuum port of the
AP sensor.
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.
3) Check the voltage between Vout 4 and ground. Also, check
if voltage reduces when vacuum is applied up to 400 mmHg
by using vacuum pump gauge. (Below)
09917-47011: Vacuum pump gauge
09900-25008: Multi-circuit tester set
Tester knob indication: Voltage ()
Is the voltage OK?
4) After repairing the trouble, clear the DTC using SDS tool.
(4-27)
Output voltage (VCC voltage 4.5 – 5.0 V, ambient temp. 20 –
30 °C, 68 – 86 °F)
YES
• Red, G/Y or B/Br wire open or shorted to
ground, or poor A, P or S 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 AP sen-
sor with a new one.
ALTITUDE
(Reference)
ATMOSPHERIC
PRESSURE
OUTPUT
VOLTAGE
(ft) (m) (mmHg) kPa (V)
0
2 000
0
610
760
707
100
94
3.1 – 3.6
2 001
5 000
611
1 524
707
634
94
85
2.8 – 3.4
5 001
8 000
1 524
2 438
634
567
85
76
2.6 – 3.1
8 001
10 000
2 439
3 048
567
526
76
70
2.4 – 2.9
V
3
ECM coupler (Harness side)
3
(Black) (Gray)
SAMPLE
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