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Troubleshooting
Load Center Diagnostics
Reference
Replace Relays and Fuses, page 64
, and
Load Center Wiring Diagram, page 143
. The LEDs on
the load center board are helpful diagnostic tools when troubleshooting problems with the engine. Before
referencing the
Engine Troubleshooting, page 40
, complete the following steps:
1. Identifywhich LEDs are on and off.
2. Determine if the LEDs are expected to be in
the state observed. Determine if an unlit LED
should be on byreferring to the LED Expected
Operation table.
Note
The starter, fuel shutoff solenoid, glow
plugs, and radiator fan operations are
sequenced during startup bythe Engine
Control Module.
3. If the LEDs light as expected, focus
troubleshooting attention to components listed in
Table 1. If the LEDs do not light as expected, first
focus troubleshooting attention to components
listed in Table 2.
4. For potential causes and solutions related
to the components in Tables 1 and 2, see
Engine Troubleshooting, page 40
.
LED Expected Operation
LED
ON State
D1
On when fuel is being fed to the engine – from
shortly before the starter cranks until the engine
is turned off.
D2
On when starter is cranking – from shortly after
the Fuel LED lights (beginning approximately
8 seconds after the green start button on the
Engine Control Module is pressed) and until
shortly after the engine turns over.
D3
On when glow plugs are warming the engine -
from when the green start button is pressed on
the Engine Control Module until shortly after the
engine starts and comes up to speed.
D4
On when radiator fan is running – from shortly
before the starter cranks until shortly after
the main power switch is turned on, then
intermittently thereafter as required by engine
temperature. (If the main power switch is left
off, the fan will run continuously.)
Table 1 lists a likelyorder of potential failures in the
load center output-side components.
Table 1 – LEDs Light As Expected
Fuel
(D1)
Starter
(D2)
Glow Plugs
(D3)
Radiator
Fan
(D4)
1
Engine Harness (E) and its connections
2
Engine
Fuel
Shutoff
Solenoid
(FD)
Starter
Solenoid
Relay
(CR6)
Glow Plugs
Solenoid
Relay
(CR7)
3
Engine
Starter
Motor (ES)
Table 2 indicates a likelyorder of potential failures in
the load center input-side power, cable, or control
components.
Table 2 – LEDs Do Not Light As Expected
Fuel
(D1)
Starter
(D2)
Glow
Plugs
(D3)
Radiator
Fan
(D4)
1
Battery
2
Battery cables and its connections
3
No D2 LED
Disconnect
switchON
4
Load Center Fuse F4
("PWR - ATO 20A")
Load
Center
Fuse F3
("FAN -
ATO 30A")
5
Fusible Link Harness (C) and its connections
6
Engine Harness (E) and its connections
7
Engine Control Module Harness (F) and
its connections
8
Load
Center
Fuel Relay
(K1)
Load
Center
Starter
Relay (K2)
Load
Center
Glow
Relay (K3)
Load
Center Fan
Relay (K4)
9
Load Center Board
10
Engine Control Module
3A1706K
37
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Summary of Contents for Reactor E-30i
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