
RENR5622 111
Troubleshooting Section
C. Operate the ground level shutdown switch.
Observe the sta
tus for the ground level shutdown
switch on Cat ET.
Expected Resu
lt:
The status of the ground level shutdown switch reads
“ON” with the g
round level shutdown switch in the
SHUTDOWN position. The status of the ground level
shutdown switch reads “OFF” when the ground level
shutdown swi
tch is in the RUN position.
Results:
•
OK – The status of the ground level shutdown
switch reads “ON” with the ground level shutdown
switch in the
SHUTDOWN pos ition. The status
of the ground level shutdown switch reads “OFF”
when the ground level shutdown switch is in the
RUN positio
n. The ground level shutdown switch is
operating normally.
Repair: The
re may be an intermittent problem. If
the problem is intermittent, refer to Troubleshooting,
“Inspecting Electrical Connectors”.
STOP.
•
Not OK – The s
tatus of the ground level switch
does not read “ON” with the ground level shutdown
switch in the SHUTDOWN position. The status of
the ground
level shutdown switch does not read
“OFF” when the ground level shutdown switch is
in the RUN position. The ground level shutdown
switch is n
ot operating normally. Proceed to Test
Step 3.
Test Step
3. Short the Wires together at
the G roun
d Level Shutdo wn Switch
A. Turn the keyswitch to the OFF position.
B. Record the position of the wiring on the ground
level shutdown switch before removing the wires.
C. Disconnect the wires from the ground level
shutdown switch.
D. Create a short circuit at the ground level shutdown
switch between the wire F716-WH and the digital
return w
ire 998-BR. Leave the wire F715-PU open.
E. Turn the keyswitch to the ON position.
F. Observe the status of the ground level shutdown
switch on Cat ET.
G. Remove the short between the wire F716-WH and
thewire998-BR.
H. Create a short circuit at the ground level shutdown
switch between the wire F715-PU and the digital
return
wire 998-BR.
I. Observe the status of the ground level shutdown
switch on Cat ET
.
J. Turn the keyswitch to the OFF position.
K. Remove the wire short.
Expected Resu
lt:
The status of the ground level shutdown switch reads
“OFF” when the
wire F716-WH and the wire 998-BR
are shorted together. The ground level shutdown
switch status reads “ON” when the wire F715-PU and
thewire998-
BR are shorted together.
Results:
•
OK – The status of the ground level shutdown
switch reads “OFF” when the wire F716-WH and
the wire 998-
BR are shorted together. The ground
level shutdown switch status reads “ON” when the
wire F715-PU and the wire 998-BR are shorted
together. T
he problem is not with the harness or
the ECM.
Repair: Tem
porarily connect a new ground level
shutdown switch. Verify that the new ground level
shutdown switch solves the problem before you
permanentl
y install the new ground level shutdown
switch.
STOP.
•
Not OK – The status of the ground level shutdown
switch doe
s not read “OFF” when the wire
F716-WH and the wire 998-BR are shorted
together. The ground level shutdown switch status
does not r
ead “ON” when the wire F715-PU and
the wire 998-BR are shorted together. There is a
problem in the harness and/or the ECM. Proceed
to Test St
ep 4.
Test Step 4. Short the Ground Level
Shutdown Switch at the ECM
A. Disconnect the ECM connector J1/P1.
B. Remove th
e wire F715-PU at the ECM connector
P1-23. Remove the wire F716-WH at the ECM
connector P1-28 and the digital return wire
998-BR f
rom ECM connector P1-5.
C. Insert a wire with socket terminals at each end
into the
ECM connector P1-28, P1-23 and P1-5.
Short the wire jumpers in P1-28 and P1-5.
D. Reconne
ct all the connectors.
E. Turn the keyswitch to the ON position.