KENR9126 169
Troubleshooting Section
E. Connect the P1 ECM connector. Connect the
connector for t
he exhaust gas temperature sensor.
Expected Result:
Each resistance measurement indicates an open
circuit.
Results:
•
OK – Each res
istance measurement indicates an
open circuit. Proceed to Test Step 6.
•
Not OK – At le
ast one resistance measurement
does not indicate an open circuit.
Repair: Th
ere is a short circuit in the harness.
Repair the harness or replace the harness.
If necessa
ry, perform the “Wiggle Test” on the
electronic service tool.
Use the el
ectronic service tool in order to clear all
logged diagnostic codes and then verify that the
repair eliminates the fault.
STOP.
Test Ste
p 6. Create a Short at the Sensor
Connect
or
A. Disconnect the exhaust gas temperature sensor
at the s
ensor connector.
B. Fabricate a jumper wire that can be used to create
ashor
t between terminal A (signal) and terminal
B (sensor return) at the connector for the exhaust
gas temperature sensor. Crimp connector pins to
each e
nd of the jumper wire.
C. Install the jumper onto the harness side of the
sens
or connector.
D. Restore the electrical power to the ECM. Wait at
leas
t 30 seconds for activation of the diagnostic
codes.
E. Acc
ess the “Active Diagnostic Code” screen on
the electronic service tool. Check for an active
0535-4 diagnostic code for the exhaust gas
tem
perature sensor.
F. Remove the electrical power from the ECM.
Expected Result:
A0
535-4 diagnostic code is now active for the
exhaust gas temperature sensor.
Results:
•
OK – A 0535-3 diagnostic code was active before
creating the short at the sensor connector. A
0535-4 diagno
stic code became active after
creating the short at the sensor connector.
Repair: Temp
orarily connect a new sensor to the
harness, but do not install the new sensor in the
engine. Use the electronic service tool in order to
verify that
the repair eliminates the fault. If there
are no active diagnostic codes for the sensor,
permanently install the new sensor.
Use the electronic service tool in order to clear all
logged diagnostic codes and then verify that the
repair eli
minates the fault.
STOP.
•
Not OK – A 0535-3 diagnostic code is still active
for the exhaust gas temperature sensor. Proceed
to Test St
ep 7.
Test Step 7. Check the Operation of the
ECM
A. Remove the electrical power from th e ECM.
B. Check th
e operation of the ECM by creating an
open at the ECM.
a. Discon
nect the P1 ECM connector.
b. Fabricate a jumper wire that is long enough to
reach
from a terminal at the ECM connector
totheenginegroundstud.Crimpaconnector
socket to one end of the jumper wire.
c. Remove the signal wire for the suspect sensor
from the P1 ECM connector. Install the jumper
wire
into the terminal location for the signal wire
of the suspect sensor.
d. Conn
ect the ECM connectors.
e. Restore the electrical power to the ECM.
f. Monitor the “Active Diagnostic Code” screen
on the electronic service tool. Wait at least 30
sec
onds for activation of the code.
An open circuit diagnostic code 0535-3 will be
ac
tive for the fuel temperature sensor.
C. Check the operation of the ECM by creating a
sh
ortattheECM.
a. Short the jumper wire that is installed into the
P
1 ECM connector to engine ground.
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