TM 5-3805-292-23
0006
ELECTRICAL TROUBLESHOOTING - ENGINE AIR DUCT HEATER INOPERATIVE
0006
Refer to malfunction EC012 Grid
EC012
Heater Circuit to The Engine Preheat
Check for diagnostic code EC012.
YES
present?
Relay Is Open in this WP.
NO
Press power button to turn power
on to machine (TM 5-3805-292-10).
Does engine air
Use a jumper wire to momentarily
duct heater work
Replace engine air duct
connect engine air duct heater relay
YES
with circuits
heater relay (WP 0161).
circuits 120FG (R) and 643A (R)
connected?
24. Engine Air Duct Heater).
NO
Remove jumper. Shut off power
(TM 5-3805-292-10).
Disconnect battery power (WP
0142). Check continuity between
engine air duct heater connector
(WP 0029), circuit 643A (R),
Repair circuit 643A (R) or replace
NO
harness side and engine air duct
present?
cable (0161).
heater relay connector (WP 0161),
circuit 643A (R), harness side (WP
Heater). Reconnect battery power
YES
Replace engine air duct heater (WP 0161).
