TM 10-3930-675-20-1
0021 00-3
ENGINE AMBIENT AIR PRESSURE SENSOR AND CIRCUITS TROUBLESHOOTING - CONTINUED
0021 00
Table 1. Error Code 1221 - High Voltage Detected at Ambient Air Pressure Sensor Circuit
Troubleshooting Procedures - Continued.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Error Code 1221 - High Voltage Detected at
Ambient Air Pressure Sensor Circuit - Continued
6. Install breakout cable between
sensor and sensor 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:
If voltage is not as specified,
proceed with the following steps.
Altitude (Ft.) vs. Voltage
0
=
3.4-4.5V
3K
=
2.8-3.8V
6K
=
2.2-3.2V
9K
=
1.7-2.7V
12K
=
1.2-2.2V
4.75-5.25V
USE TEST LEAD
KIT P/N 3822917
