Table 153
Troubleshooting Test Steps
Values Results
1. Check for Active Diagnostic Codes
A. Remove the electrical power from the ECM.
B. Verify that the solenoid connectors are free of debris and con-
nected securely.
C. Connect the electronic service tool to the diagnostic connector.
D. Restore the electrical power to the ECM.
E. Select diagnostic tests on the electronic service tool.
F. Select the “Override Parameters” screen.
G. Activate the fan override.
H. Monitor the active diagnostic code screen on the electronic serv-
ice tool. Check and record any active diagnostic codes. Wait at least
30 seconds in order for the diagnostic code to become active.
I. Disable the fan override.
Active Diagnos-
tic Codes
Result: No diagnostic codes are active.
The problem may have been related to a faulty connec-
tion in the harness. Carefully inspect the connectors
and wiring. Refer to Troubleshooting, “Electrical Con-
nectors - Inspect”.
Result: A 4212-6 code is active.
Proceed to Test Step 2.
Result: A 4212-5 code is active.
Proceed to Test Step 3.
2. Disconnect the Connector for the Engine Fan Control Sole-
noid in Order to Create an Open Circuit
A. Remove the electrical power from the ECM.
B. Disconnect the connector for the engine fan control solenoid.
C. Restore the electrical power to the ECM.
D. Activate the fan override.
E. Monitor the active diagnostic code screen on the electronic serv-
ice tool. Check and record any active diagnostic codes. Wait at least
30 seconds in order for the diagnostic code to become active.
F. Disable the fan override.
Short circuit Result: A 4212-6 code remains active. There is a short
circuit between the harness connector for the engine
fan control solenoid and the ECM.
Repair: Repair the connectors or wiring and/or replace
the connectors or wiring. Reset all active codes and
clear all logged codes. Verify that the fault is resolved.
Result: A 4212-6 code was active before disconnecting
the connector. A 4212-5 or code became active after
disconnecting the connector.
Repair: Replace the engine fan control solenoid. Reset
all active codes and clear all logged codes. Verify that
the fault is resolved.
If the fault is still present, contact the Dealer Solutions
Network (DSN).
3. Create a Short at the Connector for the Engine Fan Control
Solenoid
A. Remove the electrical power from the ECM.
B. Fabricate a jumper wire that is long enough to create a short be-
tween the terminals of the connector for the engine fan control sole-
noid. Crimp connector pins to each end of the jumper wire.
C. Install the jumper wire between terminal 1 (engine fan control sol-
enoid) and terminal 2 (solenoid return) on the harness side of the
connector.
D. Restore the electrical power to the ECM.
Open Circuit Result: The 4212-5 or code remains active with the
jumper in place.
Repair: Repair the connectors or wiring and/or replace
the connectors or wiring. Reset all active codes and
clear all logged codes. Verify that the fault is resolved.
Result: A 4212-6 or code is active when the jumper wire
is installed. A 4212-5 or code is active when the jumper
wire is removed.
Repair: Replace the engine fan control solenoid. Reset
all active codes and clear all logged codes. Verify that
the fault is resolved.
(continued)
280 UENR4469-36
Circuit Tests
Copyright of Perkins Engine Company Limited. NOT FOR REPRINTING OR RESALE
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