Perkins NJ Series Troubleshooting Manual page 164

164
Troubleshooting Section
D. Check the resistance between P2:10 to the
secondary speed/timing sensor terminal 1. The
resistance should be less than 2.0 Ohms.
Expected Result:
The readings agree with the values that are listed
above.
Results:
•
OK – The harness is not OPEN circuit. Proceed
to Test Step 6.
• Not OK – The harness is OPEN circuit.
Repair: Repair the faulty connectors or the harness
and/or replace the faulty connectors or the harness.
Reconnect all sensor and ECM connectors. Ensure
that all of the seals are correctly in place. Ensure
that all connectors are correctly coupled.
Use the electronic service tool in order to clear all
logged diagnostic codes and then verify that the
repair eliminates the fault.
STOP.
Test Step 5. Check that the Connections
and the Wiring to the Secondary
Speed/Timing Sensor and the ECM are
Isolated from Other Power Sources
A. Turn the keyswitch to the OFF position.
B. Disconnect the P2 connector. Disconnect the
connector for the primary speed/timing sensor.
Disconnect the connector for the secondary
speed/timing sensor.
C. Measure the resistance from P2:53 secondary
speed/timing sensor signal input to all other pins
on the P2. Measure the resistance from P2:53
secondary speed/timing sensor signal input to the
ground and battery+ terminals. The resistance
should be more than 20,000 Ohms.
D. Measure the resistance from P2:10 speed/timing
sensor (+8 V supply) to all other pins on the P2.
Measure the resistance from P2:10 speed/timing
sensor (+8 V supply) to the ground and the
battery+ terminals. The resistance should be more
than 20,000 Ohms.
Expected Result:
The readings agree with the values that are listed
above.
Results:
• OK – There is no short circuit. Proceed to Test
Step 7.
• Not OK – The harness has a short circuit.
Repair: Repair the faulty connectors or replace
the faulty connectors. Repair the faulty harness or
replace the faulty harness. Reconnect all sensor
and ECM connectors. Ensure that all of the seals
are correctly in place. Ensure that all connectors
are correctly coupled.
Use the electronic service tool in order to clear all
logged diagnostic codes and then verify that the
repair eliminates the fault.
STOP.
Test Step 6. Check that the Connections
and the Wiring to the Primary
Speed/Timing Sensor and the ECM
are Isolated from the Other Power
Sources
A. Turn the keyswitch to the OFF position.
B. Disconnect the P2 connector. Disconnect the
connector for the primary speed/timing sensor.
Disconnect the connector for the secondary
speed/timing sensor.
C. Check the resistance between P2:52 to each
of the other pins on P2. Check the resistance
between P2:52 to the ground and battery+
terminals. The resistance should be more than
20,000 Ohms.
D. Check the resistance between P2:10 to each
of the other pins on P2. Check the resistance
between P2:10 to the ground and battery+
terminals. The resistance should be more than
20,000 Ohms.
Expected Result:
The readings agree with the values that are listed
above.
Results:
• OK – The wires are not a short circuit. Proceed
to Test Step 7.
• Not OK – The sensor wiring has a short circuit.
SENR9982-01