Troubleshooting

204 RENR2696-01
Troubleshooting Section
•
P1:21 Switch No. 2
•
P1:9 Switch No. 3
D. Cycle the switc
h to the OFF position and to the
ON position.
Expected Resu
lt:
The switch measures less than 10 ohms in the ON
position.
The switch measures more than 2000 ohms in the
OFF position.
Results:
•
OK – There is not a problem with the wire or the
wire harness. Proceed to Test Step 6.
•
Not OK – The problem is in the wire harness
between the MIC and the ECM connector.
Repair: Repair the connector or replace the
connector. Verify that the repair has eliminated the
problem.
Proceed to Test Step 6 if the problem has not been
eliminated.
Test Step 6. Test the ECM
A. Turn the keyswitch to the OFF position.
B. Disconnect t
he P1 connector from the P1/J1 ECM
connector. Connect a 70 pin Breakout T between
the ECM connector J1 and ECM connector P1.
C. Measure the resistance between P1:37 switch
return and the following MIC pins:
•
P1:30 Switch No. 1
•
P1:21 Switc
hNo.2
•
P1:9 Switch No. 3
D. Insert a jumper wire between the suspect switch
socket in the 70 pin Breakout T and the socket 37
of the Break
out T.
E. Turn the keyswitch to the ON position. Monitor
the status
screen on the electronic service tool.
Slowly connect and disconnect the jumper wire
from the 70 pin Breakout T.
Expected Result:
With the sw
itch in the OFF position, the switch will
have an open condition.
With the switch in the ON position, the switch will
have a closed co
ndition.
Results:
•
OK – The ECM is operating correctly. STOP.
•
Not OK
Repair: If the problem has not been eliminated
temporarily c
onnect a test ECM. Remove all
jumpers and replace all connectors. The test ECM
should be programmed with the correct software.
All paramete
rs should be set to the same value of
the suspect ECM.
If the proble
m is eliminated with the test ECM,
reconnect the suspect ECM. If the problem returns
with the suspect ECM, replace the suspect ECM.
Verify that the repair has eliminated the problem.
STOP.
i01798877
Set Speed Cir
cuit - Test
System Operation Description:
Use this proc
edure under the following circumstances:
•
Verify that the set speed switch receives the proper
supply volt
age.
•
Check that the set speed switches operate
correctly.
Also, use this procedure if another procedure has
directed yo
u here.
The set speed switch provides the operator with the
ability to s
elect the desired engine speed. Engine
speed will decrease with increasing load. The set
speed control can be used to control the engine
speed. Als
o for certain engine applications, the set
speed control can be used to control the vehicle
speed.
The 1104 and 1106 engines have the following
options of set speed control:
•
Single speed
•
Dual Spee
d
•
No speed (no set speed control)