TM 10-3930-675-20-1
0021 00-1
ENGINE AMBIENT AIR PRESSURE SENSOR AND CIRCUITS TROUBLESHOOTING
0021 00
THIS WORK PACKAGE COVERS
Error Code 1221 - High Voltage Detected at Ambient
Air Pressure Sensor Circuit
Error Code 1222 - Low Voltage Detected at Ambient
Air Pressure Sensor Circuit
Error Code 1295 - Ambient Air Pressure Sensor Circuit
Failure
INITIAL SETUP
References
TM 10-3930-675-10
Tools and Special Tools
Cable, breakout (Item 43, WP 0204 00)
Test lead, female (Item 48, WP 0204 00)
Test lead, male (Item 51, WP 0204 00)
NOTE
•
Refer to WP 0004 00 for additional troubleshooting guidance, information, and illustrations
that locate critical components.
•
Refer also to illustration at end of work package for component location.
•
Ambient air pressure sensor is mounted to bracket on left side of engine, to right-rear of engine
ECU.
Table 1. Error Code 1221 - High Voltage Detected at Ambient Air Pressure Sensor Circuit
Troubleshooting Procedures.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Error Code 1221 - High Voltage Detected at
Ambient Air Pressure Sensor Circuit
1. Ensure that ignition switch is
in
OFF
position
and
disconnect engine harness
from ambient air pressure
sensor.
2. Inspect ambient air pressure
sensor and sensor harness
connectors
for
dirty,
corroded,
bent,
broken,
pushed back, and extended
pins.
Clean and repair connector(s) as
required (WP 0111 00).
3. Check ambient air pressure
sensor and sensor harness for
dirt or moisture in or on
connector and for missing or
damaged connector seals.
Remove dirt and moisture from
connector. Replace missing or
damaged connector seals (WP
0111 00).
