TM 10-3930-675-24-1
ENGINE AMBIENT AIR PRESSURE SENSOR AND CIRCUITS TROUBLESHOOTING - CONTINUED
0022 00
Table 2. Error Code 1222 - Low Voltage Detected at Ambient
Air Pressure Sensor Circuit Troubleshooting Procedures - Continued.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Error Code 1222 - Low Voltage Detected at 6. Install
breakout
cable If voltage is not as specified,
Ambient Air Pressure Sensor Circuit - Continued.
between sensor and sensor proceed with the following steps.
harness connector and place
ignition switch in ON
position. Measure signal
voltage from pin C to pin B of
breakout cable. Voltage
should be as follows:
Altitude (Ft.) vs. Voltage
0
= 3.4 to 4.5V
3K
= 2.8 to 3.8V
6K
= 2.2 to 3.2V
9K
= 1.7 to 2.7V
12K
= 1.2 to 2.2V
7. Place ignition switch in OFF
position and disconnect
ambient air pressure sensor
from
engine
harness.
Disconnect sensor harness
connector from ECU.
If measurement is not as
of sensor harness connector to
specified, notify Sustainment
chassis ground. Measurement
Maintenance to replace engine
should be greater than 100k
harness.
Ohms.
0022 00-8