TM 9-2320-387-24-l
GLOW PLUGS CIRCUIT
DIAGNOSTIC FLOWCHART
KNOWN INFO
T OPTIONS
1. STE/lCE-R TEST 89
(Page 2-506)
2. MULTIMETER
GLOW PLUGS DON’T
DRAW ANY CURRENT
TURN ROTARY SWITCH TO STOP.
IS THERE LESS THAN 0.5 VOLT
AT GLOW PLUG WIRES?
REASON FOR QUESTION
There should not be voltage at
glow plugs with switch off.
POSSIBLE
PROBLEMS
GLOW PLUG
CONTROLLER
WIRING (OPEN CIRCUIT)
8 BAD GLOWPLUGS
PCB
t
c2
1
TEST 1
KNOWN INFO
OPTIONS
1. STEIICE-R TEST 89
(Page 2-506)
2. MULTIMETER
NO SHORTS
GLOW PLUGS DRAW
ZERO AMPS
TURN THE ROTARY SWITCH TO
RUN. IS THERE LESS THAN
0.5 VOLT AT THE GLOW PLUG
WIRES?
POSSIBLE
PROBLEMS
REASON FOR QUESTION
To see if power is getting
to glow plugs.
GLOW PLUG
CONTROLLER
BAD GLOW PLUGS
PCB
KNOWN INFO
OPTIONS
1. STEIICE-R TEST 91
(Page 2-508)
2. MULTIMETER
TURN ROTARY SWITCH TO STOP.
MAKE SURE GLOW PLUG
CONTROLLER IS CONNECTED.
IS
THERE CONTINUITY FROM
SOCKET A TO SOCKET B OF PCB
ENGINE CONNECTOR HARNESS ?
NO SHORTS
GLOW PLUGS DRAW
NO CURRENT
NO VOLTAGE AT
GLOW PLUGS
POSSIBLE
PROBLEMS
REASON FOR QUESTION
Continuity indicates the harness
and controller are ok.
Noncontinuity
indicates an open in
the harness or controller.
OPEN IN PCB
OPEN IN GLOW PLUG
CONTROLLER
OPEN IN WIRING
L
-
2-298
