TM 10-3930-675-24-1
ENGINE AMBIENT AIR PRESSURE SENSOR AND CIRCUITS TROUBLESHOOTING
THIS WORK PACKAGE COVERS
Error Code 1221 - High Voltage Detected at Ambient
Error Code 1295 - Ambient Air Pressure Sensor Circuit
Air Pressure Sensor Circuit
Failure
Error Code 1222 - Low Voltage Detected at Ambient
Error Code 1298 - High Intake Air Restriction or Circuit
Air Pressure Sensor Circuit
Failure
INITIAL SETUP
References
Tools and Special Tools
TM 10-3930-675-10
Test Lead, Female (Item 121, WP 0289 00)
Test Lead, Male (Item 124, WP 0289 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 1. Ensure ignition switch is in
Ambient Air Pressure Sensor Circuit.
OFF position and disconnect
engine harness from ambient
air pressure sensor.
2. Inspect ambient air pressure Clean and repair connector(s) as
sensor and sensor harness required (WP 0113 00).
connectors
for
dirty,
corroded,
bent,
broken,
pushed back, and extended
pins.
3. Check ambient air pressure
Remove dirt and moisture from
sensor and sensor harness for
connector. Replace missing or
dirt or moisture in or on
damaged connector seals (WP
0113 00).
connector and for missing or
damaged connector seals.
