
130 RENR5622
Troubleshooting Section
Verify that the repair eliminates the problem.
STOP.
Test Step 2. Che
ck for Active Diagnostic
Codes
A. Connect Cat ET to the service tool connector.
B. Turn the k eyswitch to the ON position.
C. Monitor the ac
tive diagnostic code screen on Cat
ET. Check and record any active diagnostic codes.
Note: Wait at l
east 30 seconds in order for the
diagnostic codes to become active.
Expected Res
ult:
No diagnostic codes are active.
Results:
•
OK –Nodiagno
stic codes are active, but a
problem is suspected in the prelube system.
Proceed to Test Step 6.
•
Not OK – A 06 diagnostic code is active at this
time. Proceed to Test Step 3.
•
Not OK – A 05 diagnostic code is active at this
time. Proceed to Test Step 4.
Test Step 3. Create an Open at the
Connector for the Prelube Relay
A. Turn the key
switch to the OFF position.
B. Disconnect the connector for the prelube relay.
C. Turn the k eyswitch to the ON position.
D. Proceed to t
he “Diagnostic Overrides” screen on
Cat ET.
E. Activate th
e prelube system.
Note: Monitor the “Active Diagnostic Codes” screen
on Cat ET.
F. Check for a 05 diagnostic code for the prelube
relay.
Note: Wait at least 30 seconds in order for the
diagnosti
c codes to become active.
G. Turn the keyswitch to the OFF position.
Expected Result:
A 05 diagnostic code is now active for the prelube
relay.
Results:
•
OK – A 06 diagno
stic code was active before
disconnecting the connector. A 05 diagnostic code
became active after disconnecting the connector.
The harness an
d the ECM are OK. The problem
may be in the prelube relay.
Repair: Tem p
orarily connect a new prelube relay
to the harness, but do not install the new prelube
relay. Verify that there are no active diagnostic
codes for the
prelube relay. If there are no active
diagnostic codes for the prelube relay, permanently
install the new prelube relay. Clear any logged
diagnostic
codes.
STOP.
•
Not OK – A 06 diagnostic code remains active.
There is a short between the connector for the
prelube rel
ay and the ECM. Leave the connector
for the prelube relay disconnected. Proceed to Test
Step 5.
Test Step 4. Create a Short at the
Connector for the Prelube R elay
A. Turn the ke
yswitch to the OFF position.
B. Install a jumper wire between terminal 85 and
terminal
86 of the connector for the prelube relay.
C. Turn the keyswitch to the ON position.
Note: Monitor the “Active Diagnostic Codes” screen
on Cat ET after installing the jumper wire.
D. Proceed to the “Diagnostic Overrides” screen on
Cat ET.
E. Activate the prelube system.
Note: Mon
itor the “Active Diagnostic Codes” screen
on Cat ET.
F. Wait at le
ast 30 seconds for activation of the 06
diagnostic code.
G. Turn the k
eyswitch to the OFF position. Remove
the wire jumper.
Expected
Result:
A 06 diagnostic code is active when the jumper wire
is insta
lled. A 05 diagnostic code is active when the
jumper wire is removed.