TM 9-6115-730-24
0013
ELECTRONIC TECHNICIAN (ET) TROUBLESHOOTING - Continued
SYMPTOM
3.
Engine Timing Sensor Circuit Test.
System Operation Description:
NOTE
The camshaft (top) engine timing sensor functions as the backup in the event the crankshaft
(bottom) engine timing sensor fails.
Use this procedure and Figure 2 to troubleshoot any suspect problems with the following sensors:
Primary (crankshaft/bottom) engine timing sensor
Secondary (camshaft/top) engine timing sensor
This procedure covers the following diagnostic codes:
190-E-02 Loss of Engine Speed Signal
190-E-11 Engine Speed Sensor mechanical failure
342-E-02 Loss of Secondary Engine Speed signal
342-E-11 Secondary Engine Speed Sensor mechanical failure
Figure 2. Engine Timing Circuit.
MALFUNCTION
Engine Timing Sensor. Erratic, Intermittent, or Incorrect Signal.
Engine Timing Sensor. Failure mode not identifiable (Mechanical Failure).
CORRECTIVE ACTION
STEP 1.
On EMCP set ENGINE CONTROL switch to OFF/RESET. Set Battery
Disconnect Switch to OFF. Set DEAD CRANK SWITCH to OFF.
STEP 2.
Connect the Cat ET to connector CDC-P7 (WP 0012).
STEP 3.
Set Battery Disconnect Switch to ON. Set DEAD CRANK SWITCH to NORMAL.
On EMCP set ENGINE CONTROL switch to COOL DOWN/STOP.
STEP 4.
Turn the ENGINE CONTROL switch to MANUAL START.
