Switch Circuits - Test (Engine Oil Pressure Switch) - Perkins 854F-E34T Troubleshooting Manual

UENR0612
(Table 104, contd)
Troubleshooting Test Steps
F. Turn the keyswitch to the OFF position.
G. Remove the jumper wire.
5. Check the Voltage at the Switch Connector
A. Turn the keyswitch to the OFF position.
B. Disconnect the throttle switch.
C. Turn the keyswitch to the ON position.
D. Use a suitable multimeter to measure the voltage between the
signal terminal and the ground terminal at the switch connector.
E. Turn the keyswitch to the OFF position.
6. Check the Wiring for High Resistance
A. Turn the keyswitch to the OFF position.
B. Disconnect the throttle switch. Disconnect the P1 connector.
C. Use a suitable multimeter to measure the resistance between
the following points:
·P1:55 to the signal terminal at the switch connector
·P1:77 to the ground terminal at the switch connector
7. Check the Wiring for a Short Circuit
A. Turn the keyswitch to the OFF position.
B. Disconnect the P1 connector from the ECM.
C. Disconnect the throttle switch.
D. Use a suitable multimeter to measure the resistance between
the following points:
·P1:55 and all other terminals on the P1 connector
·P1:77 and all terminals on the P1 connector
Switch Circuits - Test
(Engine Oil Pressure Switch)
This document has been printed from SPI2. NOT FOR RESALE
Values Results
4.9 V to 5.1 V Result: The voltage is within the expected range.
Replace the throttle switch.
Use the electronic service tool to clear all logged diag-
nostic codes and verify that the repair eliminates the
fault.
Result: The voltage is not within the expected range.
Proceed to Test Step 6.
Less than 5
Result: At least one of the resistance measurements is
Ohms
greater than 5 Ohms.
The fault is in the wiring between the switch connector
and the P1 connector.
Check all wiring between the throttle switch and the
ECM. Refer to the Electrical Schematic for the
application.
Replace the faulty wiring.
Use the electronic service tool to clear all logged diag-
nostic codes and verify that the repair eliminates the
fault.
Result: Both resistance measurements are less than 5
Ohms.
Proceed to Test Step 7.
Greater than 1 k Result: At least one of the resistance measurements is
Ohm less than 1 k Ohm.
There is a short in the wiring between the throttle switch
and the P1 connector.
Check all wiring between the throttle switch and the
ECM. Refer to the Electrical Schematic for the
application.
Replace the faulty wiring.
Use the electronic service tool to clear all logged diag-
nostic codes and verify that the repair eliminates the
fault.
Result: All resistance measurements are greater than 1
k Ohm.
Contact the Dealer Solution Network (DSN).
i06019874
Use this procedure to diagnose electronic faults in the
oil pressure switch circuit.
This procedure covers the following diagnostic code:
221
Circuit Tests