104 KENR6933
Troubleshooting Section
Diagnostic Fun
ctional
Tests
i02656264
5 Volt Sensor Supply Circ uit -
Test
System Opera
tion Description:
Use this procedure to troubleshoot the system when
one of the fol
lowing diagnostic codes is active or
easily repeated:
•
0262-03 5 Vol
t Sensor DC Power Supply voltage
above normal
•
0262-04 5 Vol
t Sensor DC Power Supply voltage
below normal
Also, use th
is procedure to troubleshoot the system
when you have been directed here by another
troubleshooting procedure.
The following background information i s related
to this procedure:
The Engine Control Module (ECM) supplies regulated
+5 Volts DC to the following sensors:
•
Fuel Rail Pressure Sensor through connector P228
•
Intake Man
ifold Pressure Sensor through
connector P200
•
Engine Oil
Pressure Sensor through connector
P201
•
Analog Thr
ottle Demand Sensors (if equipped)
throughP1OEMconnector
The supply
for the +5 Volt engine pressure sensor is
routed from the ECM through the P2 connector to
terminal 1 of each pressure sensor connector. The
supply vol
tage is 5.0 ± 0.16 Volts DC. The +5 Volt
supply to the Analog Throttle Demand Sensor is
routed from the ECM through the P1 connector to
the senso
rpins“A”.
The +5 Volt diagnostic code is probably caused by a
short cir
cuit to ground or a short circuit to another
voltage source in the harness.
A diagnos
tic code can be caused by the following
conditions:
•
Ashortc
ircuit in the harness
•
A suspect sensor
•
A suspect ECM
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