TM 10-3930-675-24-1
ENGINE POSITION SENSOR CIRCUITS TROUBLESHOOTING - CONTINUED
0019 00
Table 2. Error Code 1121 - Engine Position
Sensor Circuit Failure Troubleshooting Procedures - Continued.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Error Code 1121 - Engine Position Sensor Circuit
b. Measure resistance from
Failure - Continued.
engine position sensor
connector pin B to engine
block ground. Resistance
should be greater than 100k
Ohms.
5. Remove engine position Replace damaged engine position
sensor from the engine block sensor (WP 0094 00).
(WP 0094 00). Inspect engine
position sensor for damage,
including metal debris on end
of sensor, damage to end of
sensor caused by camshaft
gear or flywheel ring gear, oil
leakage,
or
insulation
problems such as swelling, and
damaged electrical potting in
sensing end of sensor.
6. Check resistance of engine If resistance is not as specified,
position sensor:
replace engine position sensor
(WP 0094 00).
a. Measure resistance from pin
A to pin D of engine position
sensor. Resistance should be
1,000 to 2,000 Ohms.
b. Measure resistance from pin
B to pin C of engine position
sensor. Resistance should be
1,000 to 2,000 Ohms.
7. Check for a short circuit If resistance is not as specified,
between coils by measuring replace engine position sensor
resistance from pin A to pin B (WP 0094 00).
of engine position sensor.
Resistance should be greater
than 100k Ohms.
8. Disconnect sensor harness
from engine ECU (794).
9. Inspect engine harness and Clean and repair connector(s) as
engine ECU connectors for required (WP 0113 00).
dirty, corroded, bent, broken,
and pushed back or extended
pins.
0019 00-6
