P007F Charge Air Cooler Temperature Sensor Correlation Bank1 / Bank2

P007F Charge Air Cooler Temperature Sensor Correlation Bank1 / Bank2

OBD-II DTC Datasheet

Charge Air Cooler Temperature Sensor Correlation, Bank1 / Bank2

What does this mean?

This Generic Powertrain Diagnostic Trouble Code (DTC) is commonly applied to many OBD-II vehicles. This may include, but is not limited to, Ford, Range Rover, Mercedes-Benz, etc.

A stored code P007F means that the powertrain control module (PCM) has detected a mismatch in the correlated signals between the charge air temperature (CAT) sensors for individual engine groups. Bank 1 refers to the engine group that contains cylinder number one.

As you probably understood from the description of the code, P007F only applies to vehicles that are equipped with forced air intake systems and multiple air intake sources. Intake air sources include throttle bodies, and forced air systems are configured around turbochargers and superchargers.

CAT sensors usually consist of a thermistor in a plastic housing. The CAT sensor is inserted through an air sampling tube (from outside to inside) with a resistor suspended from a two-wire base. It is positioned so that ambient air entering the turbocharger intake manifold (after exiting the charge air / intercooler) can pass through it. The CAT sensor is usually designed to be screwed or screwed into the turbocharger / supercharger intake manifold near the intercooler.

The resistance level of the CAT sensor resistor decreases as the actual charge air temperature increases. This causes the voltage in the circuit to approach the reference maximum. The PCM recognizes these changes in the CAT sensor voltage as changes in the charge air temperature and reacts accordingly.

CAT sensors provide data to the PCM for boost pressure solenoid and boost pressure relief valve operation, as well as some aspects of fuel delivery and ignition timing.

If the PCM detects voltage signals from CAT sensors (for the first and second rows of engines) that reflect a difference that exceeds the maximum allowable parameters, a P007F code will be stored and a malfunction indicator lamp (MIL) may illuminate. It may take several drive cycles with a detected failure to illuminate the MIL.

What is the severity of this DTC?

Engine performance and fuel economy will undoubtedly be negatively impacted by conditions that favor the retention of the P007F code. It should be classified as heavy.

What are some of the symptoms of the code?

Symptoms of a P007F engine code may include:

• Reduced engine performance
• Louder than normal sucking or hissing when accelerating
• Oscillation on acceleration
• Rich or lean exhaust
• Reduced fuel efficiency

What are some of the common causes for the code?

Reasons for this engine code may include:

• Faulty CAT sensor
• Disconnected or burst air inlet hose
• Open or short circuit in CAT sensor wiring or connector
• Limited Air Filter Element
• Implementation of aftermarket methanol injection systems
• PCM or PCM programming error

What are some steps to troubleshoot the P007F?

When diagnosing the codes associated with a CAT sensor, I would probably start by checking that there are no obstructions to airflow through the intercooler.

If there are no obstructions in the intercooler and the air filter is relatively clean; 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, the PCM may need to be reprogrammed to optimize performance. The PCM usually continues to store the code until reprogramming occurs.

I will need a diagnostic scanner, digital volt / ohmmeter (DVOM) and reliable vehicle information source when trying to diagnose the P007F code.

I would proceed by connecting the scanner to the vehicle's diagnostic port and retrieving all stored codes and freeze frame data. Freeze frame data provides a snapshot of the exact circumstances that took place at the time of the fault that led to the stored P007F code. I would write this information down as it may be helpful as I delve deeper into the diagnostic process. Now I would clear the codes and test drive the car to see if the code is cleared.

If P007F is reset immediately:

1. Use the positive test lead from the DVOM to test the reference circuit of the sensor connector and the negative test lead to test the ground contact.
2. Turn on the key with the engine off (KOEO) and check the reference voltage (typically 5V) and ground at the individual CAT sensor connectors.

When an appropriate reference voltage and ground is found:

1. Reconnect the transducer and test the signal circuit of the CAT transducer with the positive test lead DVOM (ground probe grounded to a known good motor ground).
2. Turn on the key with the engine running (KOER) and check the sensor signal circuit with the engine running. It may be necessary to increase the engine speed or even drive the vehicle in order to effectively test the signal circuit of the CAT sensor.
3. A plot of temperature versus voltage can probably be found in the vehicle information source. Use it to determine if a sensor is working properly
4. If any of the CAT sensors are not displaying the correct voltage level (consistent with the actual CAT), suspect that it is faulty. You can use a laser pointer infrared thermometer to set the real CAT.

If the sensor signal circuit shows the correct voltage level:

• Use the DVOM to test the signal circuit (for the sensor in question) at the PCM connector. If the sensor signal goes to the sensor connector but not the PCM connector, repair the open circuit between the two components.

You can only test individual system circuits using DVOM after disconnecting the PCM (and all associated controllers). Follow the connector pinout and wiring diagrams to effectively check the resistance and / or continuity of an individual circuit.

If all of the system circuits are working as expected, you can use the DVOM (and your source of reliable vehicle information) to test individual CAT sensors. Consult your vehicle information source for component testing specifications and set the DVOM to resistance setting. Check the sensors when unplugged. CAT sensors that do not meet manufacturer's specifications should be considered defective.

Only suspect a PCM failure or PCM programming error if all CAT sensors and circuits are within specification.

• By matching the vehicle, symptoms, and codes stored in technical service bulletins (TSBs), you can find help diagnosing.

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