P141A

P141A-EXHAUST GAS TEMPERATURE SENSOR 1 AND 2 SIGNALS SWAPPED





For complete wiring diagrams refer to Diagrams/Electrical.


Theory of Operation

The aftertreatment temperature sensors are used by the electronic control module (ECM) to monitor the engine exhaust temperatures in the aftertreatment system. The aftertreatment diesel oxidation catalyst inlet temperature sensor measures the temperature of the exhaust gas entering the aftertreatment system. The aftertreatment diesel particulate filter inlet temperature sensor measures the temperature of the exhaust gas entering the diesel particulate filter. This diagnostic monitors and compares the temperatures being measured by the aftertreatment diesel oxidation catalyst inlet temperature sensor and the diesel particulate inlet temperature sensor to ensure that the temperature sensor readings match the anticipated temperature rise as the exhaust gases flow through the diesel oxidation catalyst. This fault code is logged if the ECM detects that the reading from the aftertreatment diesel oxidation catalyst inlet temperature sensor is higher than the readings from the aftertreatment diesel particulate filter inlet temperature sensor during an active regeneration event of the aftertreatment diesel particulate filter. The ECM will illuminate the amber check engine light immediately when the diagnostic runs and fails. Active regeneration of the aftertreatment diesel particulate filter will be disabled. The ECM will turn off the amber CHECK ENGINE light immediately after the diagnostic runs and passes.

- When Monitored:

Engine Running and Performing an Active Regeneration of the aftertreatment diesel particulate filter.

- Set Condition:

This fault code is logged if the ECM detects that the reading from the aftertreatment diesel oxidation catalyst inlet temperature sensor is higher than the readings from the aftertreatment diesel particulate filter inlet temperature sensor during an active regeneration event of the aftertreatment diesel particulate filter.







Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding.


1. P141A ACTIVE

Turn the ignition on. Wait 5 seconds after the ignition is turned ON.

Using the scan tool, read DTCs

Repair all other DTCs first.

Is P141A Active?

Yes

- Go To 2

No

- Refer to the INTERMITTENT CONDITION Diagnostic Procedure. Intermittent Condition

2. TEMPERATURE SENSOR

The Exhaust Temperature Sensor 1/1 and the Exhaust Temperature Sensor 1/2 readings are reversed.

Swap the wiring harness connections of the Exhaust Temperature Sensor 1/1 and the Exhaust Temperature Sensor 1/2.

Erase the DTC with the scan tool.

Did the Fault Code clear?

Yes

- Repair complete
- Perform POWERTRAIN VERIFICATION TEST. Powertrain Verification Test

No

- Replace the Both temperature sensors.
- Perform POWERTRAIN VERIFICATION TEST. Powertrain Verification Test