Ddec Iii Diagnostic Codes - PREVOST H3-41 Manual

DDEC III DIAGNOSTIC CODES

To Read Codes:
Plug a diagnostic data reader into the receptacle located on the side panel of the L.H. control panel or
momentarily depress the STOP ENGINE OVERRIDE switch, located on the L.H. lower control panel, with the
ignition ON, the engine idling or engine shut-off. Active codes will be flashed on the STOP ENGINE indicator
light, located on the central dashboard, followed by the inactive codes being flashed on the CHECK ENGINE
indicator light located on the central dashboard. The cycle is repeated until the operator depresses the
STOP ENGINE OVERRIDE switch. For example; a code "43" consists of four flashes, followed by a short
pause, then another three flashes in quick succession. The following table is a list of the diagnostic codes.
DDEC
Code
Number
(Flashed)
11 Variable speed governor sensor
voltage low
13 Coolant level circuit failed low
14 Coolant temperature circuit failed
high
15 Intercooler temperature circuit failed
low
15 Oil temperature circuit failed low
17 Bypass position circuit failed high
21 EFPA circuit failed high
23 Fuel temperature circuit failed high
25 Reserved for "no codes"
26 Aux. shutdown #2 active
28 Air temperature circuit failed low
31 Aux. output #3 short to ground (high
side)
31 Aux. output #4 short to ground (high
side)
32 SEL short to battery
34 Turbo boost pressure circuit failed
low
DESCRIPTION
DDEC
Code
Number
(Flashed)
12 Variable speed governor sensor
voltage high
14 Intercooler temperature circuit failed
high
14 Oil temperature circuit failed high
15 Coolant temperature circuit failed
low
16 Coolant level circuit failed high
18 Bypass position circuit failed low
22 EFPA circuit failed low
24 Fuel temperature circuit failed low
26 Aux. shutdown #1 active
27 Air temperature circuit failed high
31 Aux. output #3 open circuit (high
side)
31 Aux. output #4 open circuit (high
side)
32 SEL open circuit
33 Turbo boost pressure circuit failed
high
35 Oil pressure circuit failed high
8-8
TECHNICAL INFORMATION
DESCRIPTION