Perkins 1106D Troubleshooting Manual page 194

194
Troubleshooting Section
•
– If the fault has not been eliminated proceed to
Test Step 2.
Test Step 2. Check the Status of the Mode
Selector Switch
A. Turn the keyswitch to the OFF position.
B. Connect the Perkins Electronic Service Tool (EST)
to the diagnostic connector.
C. Turn the keyswitch to the ON position.
D. Monitor the status screen on the Perkins EST.
Cycle the mode switch to the ON position and to
the OFF position.
Expected Result:
The switch status should change as you cycle the
mode switches. When the switch is in the OFF
position the switch has an open condition. When the
switch is in the ON position the switch has a closed
condition.
Results:
•
OK
Repair: Verify that the status of the switch changes
as the switch is cycled.
STOP.
• Not OK – There is a fault with the circuit for the
mode selector switch. Proceed to Test Step 3.
Test Step 3. Insert a Jumper at the
Suspect Mode Switch
A. Turn the keyswitch to the OFF position.
B. Perform the following procedure to test the circuit
of mode selector switch No. 1. Place a jumper
wire across the contacts of switch No. 1.
C. Perform the following procedure to test the circuit
of mode selector switch No. 2. Place a jumper
wire across the contacts of switch No. 2.
D. Turn the keyswitch to the ON position. Monitor
the status screen on the Perkins EST. Connect
the jumper wire. Monitor the Perkins EST status
screen. Disconnect the jumper wire. Monitor the
Perkins EST status screen.
Expected Result:
When the jumper wire is connected the switch should
be in the CLOSED position.
Results:
•
OK
Repair: Verify that the jumper wire has been
removed. The suspect mode selector switch is
faulty. Replace the switch and verify that the repair
has eliminated the fault.
STOP.
•
Not OK – Proceed to Test Step 4.
Test Step 4. Measure the Resistance of
the Wire Harness at the ECM
A. Turn the keyswitch to the OFF position.
B. Disconnect the P1 OEM connector from J1.
C. Measure the resistance between P1:35 switch
return and the following ECM pins:
•
P1:46 Mode Switch No. 2
•
P1:39 Mode Switch No. 1
D. Cycle each mode switch to the OFF position and
to the ON position.
Expected Result:
The resistance is less than 10 Ohms in the mode
switch ON position.
The resistance is more than 4000 Ohms in the mode
switch OFF position.
Results:
• OK – There is no faults in the harness. Proceed
to Test Step 5.
•
Not OK – The fault is in the harness between the
sensor connector and the P1 connector.
Repair: Repair the connector or replace the
connector. Verify that the repair has eliminated the
fault.
Proceed to Test Step 5 if the fault has not been
eliminated.
Test Step 5. Test the ECM
A. Turn the keyswitch to the OFF position.
B. Temporarily disconnect the P1 OEM connector
from the ECM. Remove the pins 35, 39 and 46
from the P1 OEM connector.
SENR9982