TECHNICAL INFORMATION
5 - 7
DDEC III Diagnostic Codes
To read codes:
Use a diagnostic data reader plugged in receptacle on the bottom of side panel of L.H. control panel or
momentarily depress the Stop engine "OVERRIDE" switch (located on the L.H. lower control panel) with
the ignition on, engine at idle or not running. Active codes will be flashed on the stop engine telltale (lo-
cated on central dashboard), followed by the inactive codes being flashed on the check engine telltale
(located on central dashboard). The cycle repeats until the operator depresses again the Stop engine
"OVERRIDE" switch. A code "43" consists of four flashes, followed by a short pause, then three flashes in
quick succession.
DDC Code
Number
(Flashed)
Description DDC Code
Number
(Flashed)
Description
11 Variable speed governor sensor
voltage low
12 Variable speed governor sensor
voltage high
13 Coolant level circuit failed low 14 Intercooler temperature circuit
failed high
14 Coolant temperature circuit failed
high
14 Oil temperature circuit failed high
15 Intercooler temperature failed low 15 Coolant temperature circuit failed
low
15 Oil temperature circuit failed low 16 Coolant level circuit failed high
17 Bypass position circuit failed high 18 Bypass position circuit failed low
21 EFPA circuit failed low 22 EFPA circuit failed low
23 Fuel temperature circuit failed high 24 Fuel temperature circuit failed low
25 Reserved for "no codes" 26 Aux. shutdown #1 active
26 Aux. shutdown #2 active 27 Air temperature circuit failed high
28 Air temperature circuit failed low 31 Aux. output #3 open circuit (high
side)
31 Aux. output #3 short to ground
(high side)
31 Aux. output #4 open circuit (high
side)
31 Aux. output #4 short to ground
(high side)
32 SEL open circuit
32 SEL short to battery 33 Turbo boost pressure circuit failed
high
34 Turbo boost pressure circuit failed
low
35 Oil pressure circuit failed high
36 Oil pressure circuit failed high 37 Fuel pressure circuit failed high
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