(Table 151, contd)
Troubleshooting Test Steps
Values Results
3. Check the Supply Voltage at the Sensor Connector
A. Disconnect the coolant level sensor at the sensor connector.
B. Restore electrical power to the ECM.
C. Measure the voltage between terminals A (sensor supply) and B
(sensor return) at the harness connector for the coolant level sensor.
D. Remove electrical power from the ECM.
8.0 ± 0.5 VDC Result: The voltage measurement is not correct for
the application.
Repair: The sensor supply voltage is not reaching the
sensor. There is a fault in the circuit for the sensor sup-
ply. Repair the wiring between the sensor and the
ECM.
Result: The voltage measurement is correct for the
application.
The correct supply voltage is reaching the sensor. Pro-
ceed to Test Step 4.
4. Short the Signal Wire to Ground and Monitor the Status for
““Coolant Level””
A. Fabricate a jumper wire that is long enough to create a short cir-
cuit between two terminals at the coolant level sensor harness con-
nector. Crimp connector pins to each end of the jumper wire.
B. Install the jumper wire between terminals B (sensor return) and C
(sensor signal) on the harness connector for the coolant level
sensor.
C. Restore electrical power to the ECM.
D. Monitor the status of “Coolant Level” on the electronic service tool
while the jumper wire is installed. Wait at least 30 seconds for activa-
tion of the status indicator.
E. Remove the jumper wire. Connect the harness connector for the
coolant level sensor.
Status change Result: The status changes from “LOW” to “OK” when
the jumper wire is installed. The ECM and the wiring
harness to the coolant level sensor are OK.
Repair: Replace the coolant level sensor. Verify that
the repair eliminates the fault.
Result: The status does not change from “LOW” to
“OK” when the jumper wire is installed.
Repair: The fault is between the ECM and the sensor
connector. Repair the wiring. Verify that the repair elim-
inates the fault.
If the fault is still present, contact the Dealer Solutions
Network (DSN).
i07381347
Cooling Fan Control - Test
(Hydraulic Driven Fan)
This procedure is only applicable to engines with a
hydraulic driven fan.
Use this procedure to troubleshoot the electrical
system if a problem is suspected with the engine fan
control solenoids. Use this procedure if one of the
diagnostic codes in Table 152 is active.
278 UENR4469-36
Circuit Tests
Copyright of Perkins Engine Company Limited. NOT FOR REPRINTING OR RESALE
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