Perkins 1104E Series Troubleshooting Manual page 211

RENR2696-01
Test Step 6. Measure the Resistance of
the Cables at the ECM
Illustration 121
A. Turn the keyswitch to the OFF position.
B. Reconnect the P20 MIC.
C. Disconnect P1 ECM connector from the ECM.
D. Measure the resistance between P1:11 Set speed
control continue or accelerate and P1:37 Switch
return. First measure the resistance with the
switch in the OFF position and then measure the
switch in the ON position.
E. Measure the resistance between P1:37 and each
of ECM pin locations:
•
P1:19 Set speed control speed 1 or speed 2
•
P1:20 Set speed control set or decelerate
•
P1:28 Set speed control ON or OFF
•
P1:29 Set speed control clutch or brake
disengage
Expected Result:
The measured voltage should be less than 10 ohms
with the switch in the ON position.
The measured voltage should be more than 2000
ohms with the switch in the OFF position.
Results:
•
OK – Proceed to Test Step 7.
•
Not OK – There is a problem in the wires between
the MIC and the ECM connector.
Repair: Repair the wires or replace the wires.
Verify that the repair has eliminated the problem.
If the problem has not been eliminated repeat
Troubleshooting, "Electrical Connectors - Inspect".
STOP.
Test Step 7. Test the Engine ECM
A. Turn the keyswitch to the OFF position.
B. Insert a 70 pin Breakout T between the P1
connector and P2 connector.
C. Insert one end of a jumper wire into the socket
for the suspect switch. Insert the other end of the
jumper wire into P1:37 switch return.
D. Turn the keyswitch to the ON position and monitor
the status screen on the electronic service tool.
Slowly connect and disconnect the jumper wire
from the socket of pin 37 of the Breakout T.
211
Troubleshooting Section
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