(Table 227, contd)
Troubleshooting Test Steps
Values Results
5. Check the Duty Cycle of the Throttle Position Sensor at
the Sensor
Note: Performing certain steps within this procedure requires
the use of a multimeter that can measure a PWM duty cycle.
A. Access the following screens on the electronic service tool
to check the upper and the lower diagnostic limit of the sus-
pect throttle position sensors:
· “Service”
· “Throttle Configuration”
· “Throttle# 1”
B. Make a note of the lower diagnostic limit and the upper di-
agnostic limit.
C. Turn the keyswitch to the OFF position.
D. Remove the signal wire for the suspect digital throttle posi-
tion sensor from the connector. Refer to the Electrical Sche-
matic for the application.
E. Install a breakout “T” with three terminals at the digital throt-
tle position sensor connector.
F. Connect the multimeter probes to the sensor signal terminal
and the sensor ground terminal of the breakout T.
G. Turn the keyswitch to the ON position.
H. While the duty cycle is being monitored on the multimeter,
operate the throttle through the full range of movement.
Duty cycle above
lower diagnostic limit
at low idle
Duty cycle below
upper diagnostic limit
at high idle
Result: Not OK.
Repair: Replace the suspect digital throttle position
sensor.
Use the electronic service tool to clear all logged diag-
nostic codes and verify that the repair eliminates the
fault.
Result: OK.
Proceed to Test Step 6.
6. Bypass the Signal Wire
A. Turn the keyswitch to the OFF position.
B. Disconnect the suspect digital throttle position sensor con-
nector. Disconnect the P1 connector from the ECM.
C. Remove the sensor signal wire from the connector for the
suspect digital throttle position sensor. Remove the applicable
signal wire from P1.
D. Install the jumper wire between P1 and the signal terminal
on the suspect throttle sensor connector.
E. Access the following screens on the electronic service tool
to check the upper and the lower diagnostic limit of the throttle
position sensor:
· “Service”
· “Throttle Configuration”
· “Throttle# 1”
F. Make a note of the lower diagnostic limit and the upper diag-
nostic limit.
Duty cycle above
lower diagnostic limit
at low idle
Duty cycle below
upper diagnostic limit
at high idle
Result: OK - The throttle operates correctly with the by-
pass installed. The fault is in the sensor signal wiring.
Repair: Repair the faulty wiring or replace the faulty
wiring.
Use the electronic service tool to clear all logged diag-
nostic codes and verify that the repair eliminates the
fault.
Result: Not OK
Repair: Recheck the wiring, the ECM connectors, and
the digital throttle position sensor connector.
If no faults are found, contact the Dealer Solutions Net-
work (DSN).
(continued)
430 UENR4469-36
Circuit Tests
Copyright of Perkins Engine Company Limited. NOT FOR REPRINTING OR RESALE
To Next Page
Loading...
