
RENR5622 105
Troubleshooting Section
E. Obtain a suitable piece of wire. Short the wires
from the starti
ng aid switch together at the starting
aid switch.
F. Observe the pa
rameter for the starting aid switch
on Cat ET.
G. Remove the jum
per. Leave the wires disconnected
from the starting aid switch.
Expected Resu
lt:
The parameter for the starting aid switch displays
“ON” while th
e wires from the starting aid switch
are shorted together. The parameter for the starting
aid switch displays “OFF” when the wires from the
starting aid
switch are not shorted together.
Results:
•
OK – The ECM detects the open and the short
from the starting aid switch.
Repair: The wiring between the ECM and the
starting aid switch is OK. Replace the starting aid
switch. Ver
ify that the problem is no longer present.
STOP.
•
OK – The ECM does not detect the open and the
short at the starting aid switch. Proceed to Test
Step 13.
Test Step 13. Check the Inputs from the
StartingAidSwitchtotheECM
A. Turn the keyswitch to the OFF position.
B. Fab ricate
jumper wires that can be used to replace
the wires in the ECM connector for the starting aid
switch. Crimp a connector socket to the end of
the jumper
wires.
C. Disconnect the appropriate ECM connector for
the start
ing aid switch.
D. Remove the wires for the starting aid switch from
the ECM co
nnector.
E. Install the jumper wires into the terminal locations
for the st
arting aid switch at the ECM connector.
F. Connect the ECM connectors.
G. Check the operation of the ECM by creating
an open at the ECM:
a. Hold the loose ends of the jumper wires away
from any components in order to create an
open cir
cuit condition.
b. Turn the keyswitch to the ON position.
c. Observe the parameter for the starting aid
switch on Cat ET
.
H. Check the operation of the ECM by creating a
short circuit
at the ECM:
a. Short the jumper wires for the starting aid
switch togeth
er.
b. Observe the parameter for the starting aid
switch on Cat E
T.
I. Remove the jumper wires. Return all wiring to the
original con
figuration.
Expected Result:
The parameter for the starting aid switch displays
“ON” while the wires from the starting aid switch
are shorted t
ogether. The parameter for the starting
aid switch displays “OFF” when the wires from the
starting aid switch are not shorted together.
Results:
•
OK – The para
meter for the starting aid switch
displays “ON” while the wires from the starting aid
switch are shorted together. The parameter for
the startin
g aid switch displays “OFF” when the
wires from the starting aid switch are not shorted
together.
Repair: There is a short circuit or excessive
resistance in the wiring between the starting aid
switch and
the ECM connector. Repair the wiring
or replace the wiring. Verify that the system is
operating correctly.
STOP.
•
Not OK – Cat
ET does not indicate “ON”, when
the wire short is in place. Cat ET does not indicate
“OFF”, when the wire short is removed. The ECM
is not rea
ding the switch position.
Repair: Replace the ECM. Refer to
Troubles
hooting, “Replacing the ECM”.
STOP.