Troubleshooting

(Table 83, contd)
3217-5 Aftertreatment #1 Intake O2 : Current Below Normal The Electronic Control Module (ECM) detects a fault in the cir-
cuit for the oxygen sensor.
The fault detected is either an open circuit or short circuit in the
current pump, the ground, the current adjust, the voltage signal
or the heater circuit.
3217-6 Aftertreatment #1 Intake O2 : Current Above Normal
3217-13 Aftertreatment #1 Intake O2 : Out of Calibration The Electronic Control Module (ECM) detects a fault in the cir-
cuit for the oxygen sensor.
The fault detected is either an open circuit or short circuit in the
current pump, the ground, the current adjust, the voltage signal
or the heater circuit.
3217-15 Aftertreatment #1 Intake O2 : High - least severe (1)
3217-12 Aftertreatment #1 Intake O2 : Failure The ECM is unable to read any valid data from the oxygen
sensor.
3222-3 Aftertreatment #1 Intake Gas Sensor Heater : Voltage Above
Normal
The ECM detects a short to battery voltage in the heater circuit
for the oxygen sensor.
3222-4 Aftertreatment #1 Intake Gas Sensor Heater : Voltage Below
Normal
The ECM detects a short to ground in heater circuit for the oxy-
gen sensor.
3222-5 Aftertreatment #1 Intake Gas Sensor Heater : Current Below
Normal
The ECM detects an open circuit in the heater circuit for the
oxygen sensor.
The oxygen sensor is used to monitor the oxygen in
the engine exhaust. The ECM utilizes the signal from
the oxygen sensor to ensure that the engine burns
the fuel efficiently and reduces excessive build-up of
soot in the Diesel Particulate Filter (DPF).
The oxygen sensor generates a voltage signal that is
directly proportional to the concentration of oxygen.
This voltage signal cannot be measured accurately
with a multimeter. The signal can only be interpreted
correctly by the software that is contained in the
ECM.
A heater circuit within the oxygen sensor ensures
that a build-up of condensation does not damage the
sensor.
Illustration 40 g03617457
Schematic diagram for the oxygen sensor
Not all connectors are shown. Refer to the Electrical Schematic for the application.
UENR0612-07 169
Circuit Tests
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