Perkins 1106D Troubleshooting Manual page 138

138
Troubleshooting Section
Expected Result:
A short circuit diagnostic code or an open circuit
diagnostic code is active.
Results:
•
OK - SHORT Circuit – A short circuit diagnostic
code is active at this time. Proceed to Test Step 4.
•
OK - OPEN Circuit – An open circuit diagnostic
code is active at this time. Proceed to Test Step 5.
•
Not OK – A short circuit diagnostic code is not
active. An open circuit diagnostic code is not
active. An intermittent fault may exist.
Repair: Use the electronic service tool to perform
a "Wiggle Test". If faults are indicated, then go to
the appropriate procedure.
STOP.
Test Step 4. Disconnect The Sensor In
Order To Create An Open Circuit
A. Turn the keyswitch to the OFF position.
B. Disconnect the sensor connector for the sensor
with the short circuit diagnostic code.
C. Turn the keyswitch to the ON position.
Note: Wait at least 30 seconds in order to allow
activation of the diagnostic codes.
D. Access the "Active Diagnostic Code" screen on
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: Perform the following procedure:
1. Refer to Troubleshooting, "Electrical
Connectors - Inspect".
2. Inspect the seals of the connectors for damage.
3. Connect the sensor and verify that the fault
returns. If the fault returns, the sensor is faulty.
Replace the sensor.
This document is printed from SPI². Not for RESALE
4. Use the electronic service tool to 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. Disconnect the suspect sensor connector P100
for the coolant temperature sensor or disconnect
P103 for the inlet manifold temperature sensor.
B. Turn the keyswitch to the ON position.
Note: Wait at least 30 seconds in order to allow the
activation of any diagnostic fault codes.
C. Fabricate a jumper wire 150 mm (6 inch) long.
Crimp a terminal to both ends of the wire.
D. Monitor the "Active Diagnostic Code" screen on
the electronic service tool before installing the
jumper wire and after installing the jumper wire.
E. Install the jumper on the engine harness connector
for the suspect sensor, P100 for the coolant
temperature sensor and P103 for the intake
manifold temperature sensor. Install one end
of the jumper at the sensor signal (terminal 1).
Install the other end of the jumper at the common
connection (terminal 2).
Note: Wait at least 30 seconds in order to allow
activation of the short circuit diagnostic code.
Expected Result:
A short circuit diagnostic code is active when the
jumper is installed. An open circuit diagnostic code is
active when the jumper is removed.
Results:
•
OK – The engine harness and the ECM are OK.
Repair: Perform the following repair:
1. Temporarily connect the suspect sensor.
2. If the diagnostic code remains active, replace
the sensor.
3. Verify that the repair eliminates the fault.
4. Clear all inactive diagnostic codes.
STOP.
KENR6201-01