TM 9-6115-730-24
0010
TROUBLESHOOTING USING DVR FAULT CODES - Continued
NOTE
The watchdog is a circuit that monitors the computer to be sure it can not go off line. This failure
indicates that the computer went off line and was reset by the watchdog circuit. This failure can
occur during engine cranking if battery voltage dips too low.
SYMPTOM
3.
Code 602
MALFUNCTION
Internal Watchdog Failure
CORRECTIVE ACTION
STEP 1.
Measure voltage at B+ and B- terminals on front of DVR while starting generator
set.
a. If voltage is less than 18 Vdc, go to STEP 2.
b. If voltage is greater than 18 Vdc, proceed to STEP 8.
STEP 2.
Inspect battery connections for corrosion or loose connections per FO-4, sheet 3.
Clean and tighten connections.
STEP 3.
Inspect battery connections on TB3, terminals 1-10 and TB4, terminals 17-20 for
corrosion or loose connections. Clean and tighten connections.
STEP 4.
Inspect battery connections B+ and B- on rear of Generator Set Control (GSC)
for corrosion or loose connections. Clean and tighten connections.
STEP 5.
Inspect battery connections B+ and B- on front of DVR for corrosion and loose
connections. Clean and tighten connections.
STEP 6.
Measure voltage drop across resistor assembly A7 CB1 per FO-4, sheet 4. If
voltage drop is not less than 0.1 Vdc, replace CB1 (WP 0042).
STEP 7.
Troubleshoot charging system per alternator does not charge batteries system
troubleshooting procedure (WP 0011, SYMPTOM 23).
STEP 8.
If the problem is not resolved, replace DVR (WP 0042).
STEP 9.
Verify the problem is resolved.
0010-3
