Diagnostic Functional Tests; Volt Sensor Supply Circuit - Test - Perkins NJ Series Troubleshooting Manual

118
Troubleshooting Section
Diagnostic Functional
Tests
5 Volt Sensor Supply Circuit -
Test
System Operation Description:
Use this procedure to troubleshoot the system when
one of the following diagnostic codes is active or
easily repeated:
•
0262-03 5 Volt Sensor DC Power Supply voltage
above normal
• 0262-04 5 Volt Sensor DC Power Supply voltage
below normal
Also, use this procedure to troubleshoot the system
when you have been directed here by another
troubleshooting procedure.
The following background information is related
to this procedure:
The Engine Control Module (ECM) supplies regulated
+5 VDC to the following sensors:
• Fuel Rail Pressure Sensor through connector P228
• Intake Manifold Pressure Sensor through
connector P200
• Engine Oil Pressure Sensor through connector
P201
• Analog Throttle Demand Sensors (if equipped)
through P1 OEM connector
The supply for the +5 V engine pressure sensor is
routed from the ECM through the P2 connector to
terminal 1 of each pressure sensor connector. The
supply voltage is 5.0 ± 0.16 VDC. The +5 V supply to
the Analog Throttle Demand Sensor is routed from
the ECM through the P1 connector to the sensor
pins "A".
The +5 V diagnostic code is probably caused by a
short circuit to ground or a short circuit to another
voltage source in the harness.
A diagnostic code can be caused by the following
conditions:
• A short circuit in the harness
• A suspect sensor
• A suspect ECM
i02490153
SENR9982-01