Perkins 1106C - Page 143

KENR6933 143
Troubleshooting Section
Results:
•
OK - SHORT Circuit – A “Vo ltage Below Normal”
diagnostic code is active at this time. Proceed to
Test Step 4.
•
OK - OPEN Circuit – A “Voltage Above Normal”
diagnostic co
de is active at this time. Proceed to
Test Step 5.
•
Not OK – A “Volt
age Below Normal” diagnostic
code is not active. An “Voltage Above Normal”
diagnostic code is not active. An intermittent fault
may exist.
Repair: Use the electronic service tool to perform
a“WiggleTes
t”. If faults are indicated then go to
the appropriate procedure.
STOP.
Test Step 4. Disconnect The Sensor In
OrderToCreateAnOpenCircuit
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 key
switch to the ON position.
Note: Wait at least 10 seconds for activation of the
diagnostic
codes.
D. Access the “Active Diagnostic Code” screen of
the electr
onic service tool. Check for an active
“Voltage Above Normal” diagnostic code.
Expected R
esult:
A “Voltage Above Normal” diagnostic code for the
disconnec
ted sensor is now active.
Results:
•
OK – A “Voltage Below Normal” diagnostic code
was active before disconnecting the sensor. An
“Voltage A
bove Normal” diagnostic code became
active after disconnecting the sensor.
Repair: R
efer to Troubleshooting, “Electrical
Connectors - Inspect”.
Inspect t
he seals of the connectors for damage.
Connect the sensor and verify that the fault returns.
If the fau
lt returns, the sensor is faulty.
Replace the sensor.
Clear all logged 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. Cr
eate A Sho rt Circuit
Between The Si
gnal And The Common
Terminals At
The Sensor Harness
Connector
A. Disconnect t
he 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 a
t least 10 seconds for 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
temperatu
re sensor and P103 for the intake
manifold temperature sensor. Install one end
of the jumper at the sensor signal (terminal 1).
Install t
he other end of the jumper at the common
connection (terminal 2).
Note: Wai
t at least 30 seconds for activation of the
short circuit diagnostic code.
Expected
Result:
A “Voltage Below Normal” diagnostic code is active
when the j
umper is installed. An “Voltage Above
Normal” diagnostic code is active when the jumper
is removed.
Results:
•
OK – The e
ngine harness and the ECM are OK.
Repair: Perform the following repair:
1. Temporarily connect the suspect sensor.
2. If the di
agnostic code remains active, replace
the sensor.
3. Verify t
hat the repair eliminates the fault.
4. Clear all logged diagnostic codes.
STOP.