DDEC TROUBLESHOOTING
10.11 MISCELLANEOUS DIGITAL INPUT FAULT
The following procedure will cover miscellaneous input switch faults. All faults function in the
same manner, allowing the same troubleshooting process to be used regardless of the function.
There are 12 digital input cavities, listed in Table 10-12, available on a DDEC ECM. Any
available function can be assigned (programmed with the Programming Station) to any of the
available cavities.
When a digital input wire is switched to battery ground (usually #953), it is a request to the
ECM to activate the function assigned to that wire. Additional conditions may need to be met
for the feature to activate. Refer to the appropriate Application and Installation Manual for
these conditions.
Input Cavities
Input Cavities
E1
#451
G2
#543
F1
#542
H2
#524
G1
#528
J2
#531
H1
#523
K2
#583
J1
#541
G3
#545
F2
#544
K3
#979
Table 10-12
Input Cavities
Available functions are listed in Table 10-13.
Functions
Functions
Functions
None
Limiting Torque Curve
Trans Retarder Status
Engine Brake Low
Diagnostic Request
Dual Throttle (LSG)
Engine Brake Med
Alt Min VSG/Fast Idle
A/C Fan Status
Aux Shutdown #1
Service Brake Release
Aux CLS
Aux Shutdown #2
Clutch Released
Fan Control Override
Park Brake / ISD
Set Coast OFF DDEC II
VSG Station Change
Idle Validation
Set / Coast ON
VSG Station Complement
Pressure / RPM Mode
Resume/Accel OFF DDEC II
Air Load Switch
Throttle Inhibit
Resume / Accel ON
In Neutral Switch
RPM Sync (Marine)
Cruise Enable
In Gear Switch
RPM Freeze (Marine)
PGS System Enable
KD Brake
Rating Switch #1
SEO / DIAG Request
Gas Valve Diagnostic
Rating Switch #2
Engine Brake Disable
-
Table 10-13
Available Input Functions
All information subject to change without notice.
6SE497 9709 Copyright © 1997 DETROIT DIESEL CORPORATION
10-47
