P007F Charge Air Cooler Temperature Sensor Bank1/Bank2 Correlation
OBD-II Trouble Code Technical Description
Charge Air Cooler Temperature Sensor Bank1/Bank2 Correlation
What does that mean?
This generic powertrain diagnostic trouble code (DTC) typically applies to many OBD-II vehicles. That may include but is not limited to vehicles from Ford, Range Rover, Mercedes-Benz, etc.
A stored code P007F means that the powertrain control module (PCM) has detected a discrepancy in the correlating signals between the charge air temperature (CAT) sensors for the separate banks of the engine. Bank 1 refers to the engine bank that contains the number one cylinder.
As you have probably gathered by the code description, a P007F is applicable only to vehicles that are equipped with forced air induction systems and multiple intake air inlet sources. Intake air inlet sources include throttle bodies and forced air induction systems are configured around turbochargers and superchargers.
CAT sensors are typically composed of a thermal resistor in a plastic housing. The CAT sensor is inserted through the air inlet tube (from outside to inside) with the resistor suspended on a two-wire pedestal. It is positioned so that ambient air entering the turbocharger inlet pipe (after leaving the air charge cooler/intercooler), may flow across it. The CAT sensor is normally designed to thread or bolt into the turbocharger/supercharger inlet pipe, near the intercooler.
The level of resistance in the CAT sensor resistor decreases as actual charge air temperature increases. This causes circuit voltage to move towards the reference maximum. The PCM recognizes these variations in CAT sensor voltage as changes in charge air temperature and reacts accordingly.
The CAT sensors provide data to the PCM for boost pressure solenoid operation and boost pressure release valve operation, as well as certain facets of fuel delivery and ignition timing calibration.
If the PCM detects voltage signals from the CAT sensors (for engine banks one and two) which reflect a difference that exceeds the maximum allowable parameters, a code P007F will be stored and a malfunction indicator lamp (MIL) may be illuminated. Multiple drive cycles with a detected failure may be required for MIL illumination.
What is the severity of this DTC?
Engine performance and fuel efficiency will undoubtedly be adversely affected by the conditions which contribute to a code P007F being stored. It should be categorized as severe.
What are some of the symptoms of the code?
Symptoms of a P007F engine code may include:
Diminished engine performance Louder then normal sucking or hissing noise on acceleration Hesitation upon acceleration Rich or lean exhaust condition Diminished fuel efficiencyWhat are some of the common causes of the code?
Causes for this engine code may include:
Defective CAT sensor Disconnected or burst air inlet hose Open or shorted CAT sensor wiring or connector Restricted air filter element Introduction of aftermarket methanol injection systems PCM or PCM programming errorWhat are some P007F troubleshooting steps?
When diagnosing CAT sensor related codes, I would likely begin by ensuring that there are no obstructions in air flow across the intercooler.
If there are no intercooler obstructions and the air filter is relatively clean; a visual inspection of all CAT sensor system wiring and connectors is in order.
If the vehicle has been equipped with an aftermarket methanol injection system, PCM reprogramming may be required for optimum performance gains. The PCM will typically continue to store a code until reprogramming occurs.
I would need a diagnostic scanner, a digital volt/ohmmeter (DVOM), and a source of reliable vehicle information when attempting to diagnose a code P007F.
I would continue b
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