Perkins 1104E Series Troubleshooting Manual page 175

RENR2696-01
Test Step 4. Disconnect The Sensor In
Order To Create An Open Circuit.
Illustration 88
Engine coolant temperature sensor
A. Turn the keyswitch to the OFF position.
B. Disconnect the sensor connector of the sensor
with the short circuit diagnostic code.
C. Turn the keyswitch to the ON position.
Note: Wait at least 15 seconds for activation of the
diagnostic codes.
D. Access the "Active Diagnostic Code" screen of the
electronic service tool. Check for an active open
circuit diagnostic code.
Expected Result:
An open circuit diagnostic code for the disconnected
sensor is now active.
Results:
• OK – A short circuit diagnostic code was active
before disconnecting the sensor. An open circuit
diagnostic code became active after disconnecting
the sensor.
Repair: Refer to Troubleshooting, "Electrical
Connectors - Inspect".
Inspect the seals of the connectors for damage.
Connect the sensor and verify that the fault returns.
If the fault returns, the sensor is faulty.
Replace the sensor.
Remove all inactive diagnostic fault codes.
STOP.
• Not OK – There is a short circuit between the
sensor harness connector and the ECM. Leave the
sensor disconnected. Proceed to Test Step 6.
Test Step 5. Create A Short Circuit
Between The Signal And The Common
Terminals At The Sensor Harness
Connector.
A. Turn the keyswitch to the ON position.
Note: Wait at least 15 seconds for the activation of
any diagnostic fault codes.
B. Fabricate a jumper wire 150 mm (6 inch) long.
Crimp a Deutsch terminal to both ends of the wire.
C. Monitor the "Active Diagnostic Code" screen on
the electronic service tool before installing the
jumper wire and after installing the jumper wire.
D. Install the jumper on the engine harness
connector. Install one end of the jumper at the
sensor signal (positive terminal). Install the other
end of the jumper at the common connection for
the engine temperature sensor (terminal 2).
Note: Wait at least 15 seconds for activation of the
short circuit diagnostic code.
175
Troubleshooting Section
g00835142