2013 PACCAR MX-13 – P0127 Intercooler temperature – Data valid but too high, most severe

Fault code information

1 trip MIL
3 drive cycle recovery
Readiness group – None
Freeze frame type – Boost

Description of component(s)

Freeze frame type – Boost
The intercooler outlet temperature is measured before the EGR mixer.
Effect on the system
* Monitors intercooler performance

Location of component(s)

Diagnostic condition

This diagnostic runs 300 seconds after the engine is started.

Set condition of fault code

The PCI ECU (D420) detects that the intercooler outlet temperature is more than 100°C [212°F] for more than 30 seconds.

Reset condition of fault code

This DTC changes to inactive when the fault is no longer detected.
To validate the repair, drive the vehicle until the coolant temperature is at least 70°C [158°F]. Once the minimum target temperature has been reached, perform several low to higher speed accelerations with moderate engine load. Also perform high-load to low-load transitions. This activity should be conducted within the range of 15 km/h [10 mph] to 65 km/h [40 mph] for no more than 5 to 8 km [3 to 5 miles].

Electrical diagram(s)

Technical data

Component check, intercooler temperature sensor (F750)
Preparation
* Key off the ignition

* Disconnect connector F750
* Measure on the component connector F750

Component & circuit check, ECU (D420)
Preparation
* Key off the ignition
* Disconnect connector F750
* Measure on the front side of wiring harness connector F750

Possible causes

* Contaminated intercooler
* Faulty engine cooling fan
* Intercooler temperature sensor deviation
* Use of a winterfront at temperatures above 40°F [4°C]
* Use of an aftermarket winterfront that has excessive airflow restriction through the intercooler

Additional information

* The intercooler outlet temperature is measured before the EGR mixer temperature by the                              intercooler temperature sensor (F750).
* Engine torque is reduced.

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