Cagiva Navigator, Workshop Manual

Page: 79 / 407

C.35
INJECTION - AIR INTAKE SYSTEM
3 Remove the IAP sensor.
Connect a suction pump with a dial to the suction
passageway of the IAP sensor.
Connect three batteries of 1.5V in series (check that the total
voltage is 4.5-5.0V) and connect the – terminal to the Earth
terminal and the + terminal to the Vcc terminal.
Check the voltage between the outgoing terminal and Earth.
Also check to see if the voltage drops when a suction of 40
cmHg is applied by the pump (see the table below).
Special tool: 800096673: Suction pump with dial
Tester dial indication: Voltage ( — )
NO If the results of the test are not clear,
substitute the IAP sensor.
YES
Red/orange lead, yellow/grey lead or black/brown lead circuits open
or in short-circuit to Earth. Or connections 9, 1 or 24 are ruined.
If the leads and the connections are OK, the problem is intermit-
tent or the ECM is defective.
Recheck each terminal and the wiring for open circuits or ruined
connections (see page C-6).
Substitute the ECM and recheck.
Outgoing voltage (Vcc voltage 4.5-5.0V, ambient temperature
20-30°C.)
ALTITUDE ATMOSPHERIC OUTGOING
(Metres) PRESSURE VOLTAGE
(m) (mmHg) kPa (V)
0 760 100
I I I 3,1-3,6
610 707 94
611 Less than 707 94
I More than 634 I 2,8-3,4
1524 85
1525 Less than 634 85
I More than 567 I 2,6-3,1
2438 76
2439 Less than 567 76
I More than 526 I 2,4-2,9
3048 70
…
BATTERY 1,5 V
(4,5 V total)
V on the outgoing
Earth
ECM connectors
Vcc
1
9
24