P113C

P113C-O2 SENSOR POWER SUPPLY CIRCUIT PERFORMANCE





For a complete wiring diagram Refer to Diagrams/Electrical.

Theory of Operation


The oxygen sensor is controlled by the smart oxygen module (smart O2 module). This module is a smart device that receives information, such as dew point flag, engine speed, etc., via the J1939 datalink from the primary engine electronic control module (ECM). It provides ECM with the oxygen concentration signal. It also performs its own diagnostics and reports failures back to the primary engine ECM using the J1939 datalink. The ECM then decodes the error message and converts it to a fault code.

- When Monitored:
Ignition on or engine started.

- Set Condition:
Supplied voltage to the smart O2 module is below 9.5 volts OR above 13.5 volts.







Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Initial Inspection and Diagnostic Overview


Diagnostic Test


1. OTHER DTC'S
Ignition on, engine not running.
With the scan tool, read DTC's.
Are there any Alternator Voltage errors or low voltage errors for the Mass Airflow sensor or EGR Airflow Controller?

Yes


- Repair the Alternator error or Smart Power Relay power supply.
- Perform POWERTRAIN VERIFICATION TEST - 6.7L. Powertrain Verification Test


No


- Go To 2



2. P113C ACTIVE
Is DTC P113C Active?

Yes


- Go To 3


No


- Refer to the INTERMITTENT CONDITION Symptom. Intermittent Condition



3. POWER SUPPLY TO SMART O2 MODULE OPEN




Turn the ignition off.
Disconnect the smart O2 module harness connector.

NOTE: Check connectors - Clean/repair as necessary.

Ignition on, engine not running.
Measure the voltage between the smart O2 module power Supply circuit and the smart O2 module Ground circuit at the smart O2 module harness connector.
Is the voltage greater than 9.5 volts and less than 16.5 volts?

Yes


- Go To 4


No


- Repair/Replace the Smart Power Relay harness for an open.
- Perform POWERTRAIN VERIFICATION TEST - 6.7L. Powertrain Verification Test



4. SMART O2 MODULE
Reconnect the smart O2 module harness connector.
Reconnect the C1 ECM harness connector.
Ignition on, engine not running.
With the scan tool, read DTC's.
Is DTC U010C Active?

Yes


- Replace the smart O2 module
- Perform POWERTRAIN VERIFICATION TEST - 6.7L. Powertrain Verification Test


No


- Test Complete. The removal and installation of the connector corrected the problem.
- Perform POWERTRAIN VERIFICATION TEST - 6.7L. Powertrain Verification Test