
KENR6933
131
Troubleshooting Section
Expected Result:
The short circuit diagnostic code is not present when
a new sensor is connected.
Results:
•
OK – Use the electronic service tool in order to
clear all logged diagnostic codes and then verify
that the repair eliminates the fault. STOP.
•
Not OK – Repair the engine harness connector.
Use the electronic service tool to clear the logged
diagnostic codes. STOP.
Test Step 7. Create a Short Circuit
Between the Signal and the Common
Terminals at the Engine Harness
Connector
A.
Turn the keyswitch to the ON position.
B.
Fabricate a jumper wire 150 mm (6 inch) long.
Crimp a 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 (terminal 3). Install the other end
of the jumper at the common connection for
the pressure sensor (terminal 2). Wait at least
30 seconds for 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.
Use the electronic service tool to verify if the
diagnostic code remains active.
3.
If the diagnostic code is active replace the
sensor.
4.
Use the electronic service tool in order to clear
all logged diagnostic codes and then verify that
the repair eliminated the fault.
STOP.
•
Not OK – The open circuit diagnostic code
remains active when the jumper is installed. The
most probable location for the open circuit is in the
common wire for the sensor, or in the sensor signal
wire of the engine harness between the ECM and
the sensor. Remove the jumper. Proceed to Test
Step 8.
Test Step 8. Check the Operation of the
ECM by Creating Open and Short Circuits
at the ECM Connector
A.
Turn the keyswitch to the OFF position.
B.
Disconnect connector P2 from the ECM.
Thoroughly inspect both halves of the connector
for signs of corrosion or moisture. Refer to
Troubleshooting, “Electrical Connectors - Inspect”.
C.
Reconnect P2 connector.
D.
Turn the keyswitch to the ON position. Use the
electronic service tool in order to monitor the
“Active Diagnostic Code” screen. Wait at least 10
seconds for activation of the code.
An open circuit diagnostic code should be active
for the suspect sensor.
Note:
When the P2connector is disconnected, all of
the open circuit diagnostic codes for the pressure
sensors and temperature sensors will be active. This
is normal. Disregard the diagnostic codes for the
pressure sensors and the temperature sensors that
are not suspect. Monitor the diagnostic codes for the
suspect sensors only.
E.
Turn the keyswitch to the OFF position.
F.
Fabricate a jumper wire 150 mm (6 inch) long.
Crimp a terminal to both ends of the wire.
G.
Install the jumper wire on the P2 connector.
Insert the jumper wire between the terminal
for the suspect sensor signal and the common
connection for the engine’s pressure sensor.
Use the electronic service tool to verify that there
is a “Voltage Above Normal” diagnostic code.
Expected Result:
“Voltage Below Normal” diagnostic codes and
“Voltage Above Normal” diagnostic codes were
active.
Results:
•
OK – The ECM is operating correctly. Proceed to
Test Step 9.
Summary of Contents for 1106C Genset
Page 1: ...May 2007 Troubleshooting 1106C Genset PK Engine KENR6933 00 ...
Page 19: ...KENR6933 19 Troubleshooting Section g01178875 Illustration 6 ...
Page 186: ...186 KENR6933 Index Section ...
Page 187: ...KENR6933 187 Index Section ...
Page 188: ...Copyright 2007 Perkins Engines Company Limited All Rights Reserved Printed in U K ...