TM 10-3930-675-24-1
ENGINE AMBIENT AIR PRESSURE SENSOR AND CIRCUITS TROUBLESHOOTING - CONTINUED
0022 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 4. 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. Place
ignition switch in ON and
measure supply voltage from
pin A to pin B of breakout
cable. Voltage should be 4.75
to 5.25V.
4.75-5.25V
A
C
B
5. Disconnect sensor harness a. If engine harness requires
connector from ECU and
replacement,
notify
place ignition switch in ON
Sustainment Maintenance.
position. Measure voltage at b. If voltage is not as specified,
replace engine ECU (WP 0080
ECU sensor port from pin 17
00).
to pin 31 of ECU sensor port.
Voltage should be 4.75 to
5.25V.
0022 00-2