98 KENR9126
Troubleshooting Section
i04016595
CID 1785 FMI 03
Conditions Which Generate This Code:
The Electronic Control Module (ECM) detects the
following conditions:
•
The ECM has been powered for 2 seconds.
•
The signal v
oltage from the intake manifold
pressure sensor is above 4.95 VDC for at least 2
seconds.
•
This diagnostic code can be caused by an open
circuit or a short to another power source.
System Response:
If equipp
ed, the diagnostic light will be on. The
diagnostic code will be logged.
Thedataf
or the intake manifold pressure will be set
to a maximum valid pressure for 2 seconds. The
ECM will then flag the intake manifold pressure as
being in
valid. A default value is then used for the
intake manifold pressure.
Possibl
e Performance Effect:
For engines with an electronically controlled
wasteg
ate, the current for the wastegate solenoid
will be set to a default value while this code is active.
This will cause the engine to have poor acceleration.
The de
fault setting will prevent any overpressure in
the intake manifold which could be caused by an
overspeed of the turbocharger.
Troubleshooting:
This
diagnostic code will detect excessively high
voltage from the intake manifold pressure sensor.
Perf
orm the following diagnostic procedure: “Engine
Pressure Sensor Open or Short Circuit - Test”
Res
ults:
•
OK – STOP.
i04
016596
CID 1785 FMI 04
Co
nditions Which Generate This Code:
The Electronic Control Module (ECM) detects the
f
ollowing conditions:
•
The signal voltage from the intake manifold
pressure senso
r is less than 0.2 VDC for at least
2 seconds.
•
The ECM has bee
n powered for 2 seconds.
•
Thiscodecanbecausedbyashorttogroundor
a shorted sen
sor.
•
The keyswitch is in the “ON” position so that the
ECM is energ
ized.
System Response:
If equipped, the diagnostic light will come on. The
diagnostic code will be logged.
The data for the intake manifold pressure will be set
to a m aximum valid pressure for 2 seconds. The
ECM will th
en flag the intake manifold pressure as
being invalid. A default value is then used for the
intake manifold pressure.
Possible Pe rformance Effect:
For engin
es with an electronically controlled
wastegate, the current for the wastegate solenoid
will be set to a default value while this code is active.
This wil
l cause the engine to have poor acceleration.
The default setting will prevent any overpressure in
the intake manifold which could be caused by an
overspe
ed of the turbocharger.
Troubleshooting:
This diagnostic code will detect excessively low
voltage from the intake manifold pressure sensor.
Perform the following diagnostic procedure: “Engine
Pressure Sensor Open or Short Circuit - Test”
Results:
•
OK – S
TOP.
i04016597
CID 1
785 FMI 1 0
Conditions Which Gen erate This Code:
Thi
s diagnostic code is designed to detect the loss of
the 5 V supply at the sensor connector.
Th
e Electronic Control Module (ECM) detects the
following conditions:
•
Th
e engine speed is more than 1000 rpm.
•
The intake manifold pressure is within the
a
cceptable range.
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