Ecm Memory - Test - Perkins NJ Series Troubleshooting Manual

146
Troubleshooting Section
Expected Result:
When the sensor is removed from the accelerator
pedal assembly and the sensor slot is released, the
duty cycle is 10 percent or less. When the sensor slot
is moved to the maximum position, the duty cycle
increases to 90 percent or more.
Results:
•
OK – The digital throttle position sensor is working
correctly. Refer to the OEM dealer for correct
replacement of the accelerator pedal assembly.
STOP.
• Not OK – The digital throttle position sensor is
faulty. Check the accelerator pedal assembly
in order to ensure that the accelerator pedal
assembly is not causing damage to the sensor. If
the accelerator pedal assembly is causing damage
to the sensor, refer to the OEM dealer for correct
replacement of the accelerator pedal assembly.
If the accelerator pedal assembly appears OK,
replace the digital throttle position sensor. STOP.
Test Step 11. Route the Supply Bypass
Wires to the Digital Throttle Position
Sensor
A. Turn the keyswitch to the OFF position.
B. Temporarily remove the signal wire for the digital
throttle position sensor from P1:53.
C. Remove terminal "C" (digital throttle position
sensor signal) from the digital throttle position
sensor connector.
D. Route the new wiring from the ECM to the digital
throttle position sensor.
E. Turn the keyswitch to the ON position.
F. Check the duty cycle of the digital throttle position
sensor on Perkins EST while the digital throttle
pedal assembly is being moved over the full range.
Expected Result:
The duty cycle is between 10 and 22 percent with the
throttle pedal assembly in the low idle position, and
the duty cycle is between 75 and 90 percent with the
throttle pedal assembly in the high idle position.
Results:
• OK
Repair: Perform the following repair:
The wiring from the ECM to the digital throttle
position sensor appears faulty. Permanently install
new wiring.
Use the electronic service tool in order to clear all
logged diagnostic codes and then verify that the
repair eliminates the fault.
STOP.
•
Not OK – Double check the wiring, P1/J1
connectors and the digital throttle position sensor
connector. If a fault still exists, restart the test
procedure. STOP.

ECM Memory - Test

System Operation Description:
This procedure covers the following diagnostic codes:
•
0253-02 Personality Module erratic, intermittent,
or incorrect
Background Information
0253-02
The flash file in the Electronic Control Module (ECM)
is from the wrong engine family. The engine will not
start.
Correct the Condition
Determine the diagnostic code that is active.
Expected Result:
A 0253-02 diagnostic code is active.
Results:
•
A 0253-02 code is active
Repair: Obtain the engine serial number. Use
PTMI to determine the latest available flash file for
the engine. Verify that the latest available flash file
is loaded into the ECM.
STOP.
SENR9982-01
i02493833