Allison HD 4560 - 6 5. DIAGNOSTIC CODE LIST AND DESCRIPTION

6–4 Copyright © 1998 General Motors Corp.
DIAGNOSTIC CODES
WTEC II ELECTRONIC CONTROLS TROUBLESHOOTING MANUAL
•
All Segments Displayed — All display segments will be illuminated if a severity 1 diagnostic code is
present during initialization or if an electrical code for solenoids A, B, C, D, E, or G is logged before
initialization completes.
•
All Segments Blank — When two COP timeouts occur within two seconds of each other (reference
Code 69 33) for an integral selector display.
6–5. DIAGNOSTIC CODE LIST AND DESCRIPTION
Table 6–2. WT Series Diagnostic Codes
Main
Code
Subcode Description
DO NOT
SHIFT
Light
Inhibited Operation
Description
13 12 ECU input voltage, low Yes
DNS, SOL OFF
(Hydraulic default), DNA
13 ECU input voltage, medium low No None, DNA
23 ECU input voltage, high Yes
DNS, SOL OFF
(Hydraulic default)
14 12 Oil level sensor, failed low No None
23
Oil level sensor, failed high
(not used)
No None
21 12 Throttle position sensor, failed low No Use full throttle default, DNA
23 Throttle position sensor, failed high No Use full throttle default, DNA
22 14
Engine speed sensor
reasonableness test
No Use default engine speed, DNA
15
Turbine speed sensor
reasonableness test
Yes DNS, Lock in current range, DNA
16
Output speed sensor reasonableness
test
Yes
(1)
DNS, Lock in current range, DNA
23 12
Primary Shift Selector or RSI
Link Fault
No
Hold in last valid direction.
May cause “cateyes” display.
13
Primary Shift Selector Mode
Function Fault
No Mode change not permitted
14
Secondary Shift Selector or RSI
Link Fault
No
Hold in last valid direction.
May cause “cateyes” display.
15
Secondary Shift Selector Mode
Function Fault
No Mode change not permitted
24 12 Sump fluid temperature, cold Yes DNS, Lock-in-neutral
23 Sump fluid temperature, hot No
No upshifts above a calibration
rang