152 KENR9126
Troubleshooting Section
E. Use the electronic service tool to check for a short
circuit diagno
stic code. The new sensor should be
connected to the harness at this time.
Expected Resu
lt:
The short circuit diagnostic code is not present when
a new sensor i
s connected.
Results:
•
OK – Use the electronic service tool in order to
clear all logged diagnostic codes and then verify
that the rep
air eliminates the fault. STOP.
•
Not OK – Repair the engine harness connector.
Use the ele
ctronic service tool to clear the logged
diagnostic codes. STOP.
Test Step 7
. Create a Short Circuit
Between t
he Signal and the Common
Terminal
s at the Engine Harness
Connect
or
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
jumpe
r wire and after installing the jumper wire.
D. Install the jumper on the engine harness
conne
ctor. 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 p
ressure sensor (terminal 2). Wait at least
30 seconds for activation of the short circuit
diagnostic code.
Expected Result:
Ash
ort 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 followin g repair:
1. Temporarily connect the suspect sensor .
2
.
U
se the electro nic service tool to verify if the
diagnostic code remains active.
3
.
I
f the diagnostic code is active replace the
sensor.
4. Use the electronic service tool in order to clear
all logged diag
nostic codes and then verify that
the repair eliminated the fault.
STOP.
•
Not OK – The open circuit diagnostic code
remains acti
ve 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 e
ngine 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 k
eyswitch to the OFF position.
B. Disconnect connector P2 from the ECM.
Thoroug
hly inspect both halves of the connector
for signs of corrosion or moisture. Refer to
Troubleshooting, “Electrical Connectors - Inspect”.
C. Reconnect P2 connector.
D. Turn th
e keyswitch to the ON position. Use the
electronic service tool in order to monitor the
“Active Diagnostic Code” screen. Wait at least 10
second
s for activation of the code.
An open circuit diagnostic code should be active
for th
e suspect sensor.
Note: When the P2connector is disconnected, all of
the op
en circuit diagnostic codes for the pressure
sensors and temperature sensors will be active. This
is normal. Disregard the diagnostic codes for the
pres
sure 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. Fab
ricate a jumper wire 150 mm (6 inch) long.
Crimp a terminal to both ends of the wire.
G. Ins
tall the jumper wire on the P2 connector.
Insert the jumper wire between the terminal
for the suspect sensor signal and the common
co
nnection 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
a
ctive.
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