TM 10-3930-675-24-1
ENGINE AMBIENT AIR PRESSURE SENSOR AND CIRCUITS TROUBLESHOOTING - CONTINUED
0022 00
Table 4. Error Code 1298 - High Intake Air Restriction or
Circuit Failure (RESET or USMC Only) Troubleshooting Procedures - Continued.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Error Code 1298 - High Intake Air Restriction or 5. Check continuity of the two If no continuity found on either
Circuit Failure (RESET or USMC Only) -
wires between the air pressure wire, replace the air pressure
Continued.
sensor harness connector and sensor harness (WP 0113 00).
the switched output A
connector (pins 1 and 3).
6. Check
for
voltage. a. If voltage is not as specified,
Disconnect the switched
check continuity of wires
output A connector. Turn the
between the switched output A
ignition and check voltage at
connector pins 1 and 3 and
pin 1 to ground. Voltage
ECU (794) sensor connector
should be 4.75V to 5.25V.
harness pins 18 and 20.
b. If no continuity found at either
wire, contact Sustainment
Maintenance to replace engine
harness.
7. Inspect connector and ECU. a. Clean and repair connector
Disconnect the ECU (794)
and required (WP 0113 00).
sensor harness connector. b. Replace damaged ECU (794)
(WP 0080 00).
Inspect the sensor harness
connector and ECU for
damage, dirt, or corrosion.
8. Check for voltage. Turn the If voltage is not as specified,
ignition on and check voltage replace ECU (794) (WP 0080 00).
at pin 18 on the ECU (794)
and ground. Voltage should
be 4.75V to 5.25V.
0022 00-14
