Perkins NJ Series Troubleshooting Manual page 124

124
Troubleshooting Section
• Engine temperature sensors
• Analog throttle demand sensors (if equipped)
Expected Result:
Diagnostic code 0262-04 is not active. A "voltage
high" diagnostic code (open circuit) is active for all of
the engine pressure sensors, temperature sensors
and throttle demand sensors (if equipped).
Results:
• OK – Diagnostic code 0262-04 is not active.
Repair: Replace all wires to the original
configuration.
Proceed to Test Step 6.
• Not OK – The 5 volt diagnostic codes are still
active.
Repair: Connect a test ECM. Refer to the
Troubleshooting Guide, "Replacing the ECM" and
Troubleshooting Guide, "Test ECM Mode".
If the test ECM fixes the fault, reconnect the
suspect ECM.
If the fault returns, permanently install the new
ECM.
Use the electronic service tool in order to clear all
logged diagnostic codes and then verify that the
repair eliminates the fault.
STOP.
Test Step 6. Measure the +5 Volt Supply
to the Sensor
A. Turn the keyswitch to the ON position.
Note: All the pressure sensors and the analog
throttle demand sensors (if equipped) should be
disconnected.
B. Measure the voltage between terminal 1 (Pressure
sensor +5 V) and the engine ground for each of
the pressure sensors.
C. Measure the voltage between terminal A (analog
throttle demand sensors +5 V) and the engine
ground for each of the analog throttle demand
sensors.
Expected Result:
The voltage is 5.0 ± 0.16 VDC.
Results:
• OK – The +5 volt supply is within the expected
range. Proceed to Test Step 7.
• Not OK – The voltage is greater than 5.16 volts.
Repair: Check the +5 volt supply wire for a short
to a higher voltage source.
Repair the +5 volt supply wire and/or replace the
+5 volt supply wire.
Verify that the repair eliminates the fault.
STOP.
•
Not OK – The voltage is less than 4.84 volts.
Repair: Check the +5 volt supply wire for a short
to ground.
Repair the +5 volt supply wire and/or replace the
+5 volt supply wire.
Use the electronic service tool in order to clear all
logged diagnostic codes and then verify that the
repair eliminates the fault.
STOP.
Test Step 7. Perform the "Wiggle Test"
on the Electronic Service Tool
A. Select the "Wiggle Test" from the diagnostic tests
on the electronic service tool.
B. Choose the appropriate group of parameters to
monitor.
C. Press the "Start" button. Wiggle the wiring harness
in order to reproduce intermittent faults.
If an intermittent fault exists, the status will be
highlighted and an audible beep will be heard.
Expected Result:
No intermittent faults were indicated during the
"Wiggle Test".
Results:
• OK – No intermittent faults were found. The
harness and connectors appear to be OK. If you
were sent from another procedure, return to the
procedure and continue testing. If this test has
resolved the fault, return the engine to service.
STOP.
SENR9982-01