(Table 158, contd)
2. Check the Sensor Supply Voltage at the Sensor
Connector
A. Turn the keyswitch to the OFF position.
B. Disconnect the sensor connector from the wiring harness.
C. Turn the keyswitch to the ON position.
D. Measure the sensor supply voltage between terminal 2 and
terminal 3.
Supply Voltage Result: The supply voltage is not reaching the sensor.
Repair: Refer to Troubleshooting, “Sensor Supply - Test”.
Result: The supply voltage is reaching the sensor.
Proceed to Test Step 3.
3. Check the Signal Frequency at the Sensor Connector
A. Turn the keyswitch to the OFF position.
B. Remove the wire from terminal 1 on the sensor side of the
connector. Connect the sensor connector.
C. Turn the keyswitch to the ON position.
D. Access the “Fan Override Test” under the “Diagnostics”
menu on the electronic service tool.
E. Start the “Fan Override Test” on the electronic service tool.
Set the fan speed to 800 rpm.
F. Use a multimeter to measure the frequency between the
signal wire from the sensor and engine ground.
G. Deactivate the “Fan Override Test” .
H. Turn the keyswitch to the OFF position.
I. Restore all connectors and wiring to the original
configuration.
Sensor
Frequency
Result: The frequency is approximately 80 Hz.
The engine cooling fan speed sensor is generating the correct
signal.
Repair: Repair the harness or replace the harness.
Verify that the fault is resolved.
Result: The frequency is not approximately 80 Hz.
Repair: Replace the fan speed sensor.
Verify that the fault is resolved.
If the fault is still present, contact the Dealer Solutions Net-
work (DSN).
i06163220
Data Link - Test
Use this procedure if the electronic service tool will
not communicate with the ECM through the data link.
UENR4469-36 285
Circuit Tests
Copyright of Perkins Engine Company Limited. NOT FOR REPRINTING OR RESALE
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