Troubleshooting

106 RENR2696-01
Troubleshooting Section
•
P1:18ThrottleNo2
•
P1:25ThrottleNo1
•
P1:44 Sensor co
mmon
•
P1:45 +5V DC sensor supply
E. Check the ECM connector (Allen head screw) for
the proper torque of 6.0 N·m (55 lb in).
Expected Result:
The connector
s and wiring should be free of the
following problems: damage, abrasion, corrosion,
and incorrect attachment.
Results:
•
OK – Proceed to
Test Step 2.
•
Not OK
Repair: Repair the connectors or wiring and/or
replace the connectors or wiring.
STOP.
Test Step 2. C
heck for active Diagnostic
Codes.
A. Turn the keyswitch to the ON position.
B. Use the electronic service tool to check for
diagnostic codes.
Expected Result:
RESULT 1 The
electronic service tool displays the
following active diagnostic codes:
•
91-03
•
91-04
•
774-03
•
774-04
RESULT 2 The electronic service tool displays the
following a
ctive diagnostic codes:
•
91-12
•
774-12
•
262-03
•
262-04
RESULT 3 The electronic service tool displays the
following acti
ve diagnostic codes:
•
91-02
•
774-02
RESULT 4 The el
ectronic service tool displays no
active diagnostic codes:
Results:
•
Result 1 – Proceed to Test Step 3.
•
Result 2 – Proceed to Test Step 5.
•
Result 3
Repair: Refer to Troubleshooting, “Idle Validation
Circuit Tes t”
.
STOP.
•
Result 4 – Proceed to Test Step 3.
Test Step 3. Ch
eck the Throttle Position
with the E lec
tronic Service To ol.
A. Connect the electronic service tool to the
diagnostic c
onnector.
B. Turn the keyswitch to the ON position. The engine
should be off
.
C. Observe the throttle position reading on the
electronic
service tool.
D. Depress the throttle and release the throttle.
Expected Result:
The output s
hould increase when the throttle pedal is
depressed.
The output s
hould be between “20 percent” and “27
percent” at the low idle position. The output should
be between “80 percent” and “87 percent” at the high
idle positi
on.
Results:
•
OK – The throttle demand sensor is operating
correctly. P roceed to Test Step 5.
•
Not OK – The ECM is not receiving a correct
signal from the sensor. There may be a problem in
the harnes
s.ProceedtoTestStep4.