Perkins NJ Series Troubleshooting Manual page 205

SENR9982-01
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. Use the electronic
service tool in order to clear all logged diagnostic
codes and then 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. Use the electronic service tool to clear
all diagnostic codes and then 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.
C. Reconnect the P1 OEM connector.
D. Turn the keyswitch to the ON position. Monitor the
status screen of the Perkins EST.
E. Disconnect the P1 OEM connector from J1.
F. Insert a jumper wire between the suspect switch
socket and P1:35.
G. Turn the keyswitch to the ON position. Monitor the
status screen of the Perkins EST.
Expected Result:
When the connections are removed from the P1
OEM connector, the mode switch indication on the
Perkins EST will be in the OFF position. The switch
will indicate an open condition.
When the jumper is connected to the P1 OEM
connector, the mode switch indication on the Perkins
EST will be in the ON position. The switch will
indicate a closed condition.
Results:
• OK – The ECM is operating correctly. STOP.
• Not OK
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Troubleshooting Section