K 2500 Truck 4WD V8-379 6.2L DSL VIN C FI (1989)
The following is a list of vehicle fuses that may be blown if there is a short to ground in the transmission TCC solenoid wiring. This list assumes that
each transmission contains three wires in the solenoid wiring assembly. Check the Transmission Diagnosis section of the appropriate Service Manual to
determine which wiring assembly is being used.
This is not a complete list of all fuses that may blow. Vehicle design differences make it impossible to list every possible circuit configuration that may
occur. Consult the electrical diagrams for the vehicle you are servicing to see if additional fuses may be affected.
(circuit 420)
(circuit 422)
(circuit446)
Vehicle
If wire A
If wire D
If wire B
Line
shorts
shorts
shorts
the following fuses may blow:
C/K truck
ECM/Ign
"See statement
TCC enabled (when
below
available) after
a 1-2 upshift
S/F truck
Ign.-Gages
"
"(N/A 2.5L)
M-Van
Gages
"
"
G-Van
Gages
"
"
R/V truck
Gages-Idle
"
"
*
If the white wire shorts, three different conditions may occur depending on which wiring assembly is used on a particular transmission:
TCC ENABLED This may occur if the transmission is over temperature and there is a short in the white wire between the TCC and the TCC switch.
TCC ENABLED IN SECOND-FOURTH This may occur if tbere is a short between the temperature switch and the ECM.
ROUGH ENGINE
If the transmission has a fourth gear switch and there is a short between tbe switch and the ECM, the ECM will always receive a signal that the
transmission is in fourth gear. This may affect engine performance if spark timing depends on transmission gear information.
