Table 158
Troubleshooting Test Steps
Values Results
1. Check the Status of the Engine Fan Speed
A. Turn the keyswitch to the OFF position.
B. Connect the electronic service tool to the diagnostic
connector.
C. Turn the keyswitch to the ON position.
D. Access the “Fan Override Test” under the “Diagnostics”
menu.
E. Start the “Fan Override Test” on Cat ET. Set the fan speed
to 500 rpm.
F. Use Tooling (A) to determine the actual speed of the fan.
G. Compare the engine fan speed that is reported by the elec-
tronic service tool to the actual engine fan speed that is re-
ported by Tooling (A).
H. Deactivate the “Fan Override Test” .
I. Turn the keyswitch to the OFF position.
Fan Speed Result: The engine fan speed is within ± 50 rpm.
The sensor is operating correctly. There may be an intermit-
tent electrical problem in a connector or in the harness. If an
intermittent problem is suspected, refer to Troubleshooting,
“Electrical Connectors - Inspect”.
Result: The engine fan speed is not within ± 50 rpm.
Proceed to Test Step 2.
(continued)
284 UENR4469-36
Circuit Tests
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