
This procedure covers open circuit diagnostic codes
and short circuit diagnostic codes that are associated
with the following sensors:
• Intake manifold temperature sensor
• Coolant temperature sensor
• Exhaust gas temperature sensor
• Fuel temperature sensor
• Air inlet temperature sensor
• DOC inlet temperature sensor
• DPF inlet temperature sensor
The following background information is related
to this procedure:
The troubleshooting procedures for the diagnostic
codes of each temperature sensor are identical. The
temperature sensors have two terminals. The signal
voltage from each sensor is supplied to the
appropriate terminal in the P2/J2 connector or the P1/
J1 connector.
Pull-up Voltage
The ECM continuously outputs a pull-up voltage on
the circuit for the sensor signal wire. This pull-up
voltage is required for correct sensor operation and
diagnostics.
When the sensor is disconnected, this pull-up voltage
can be measured at the harness connector for the
sensor.
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UENR0612
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