P007D A high charge air cooler temperature sensor circuit

P007D A high charge air cooler temperature sensor circuit

OBD-II DTC Datasheet

Charge Air Cooler Temperature Sensor Circuit Bank 1 High

What does this mean?

This Diagnostic Trouble Code (DTC) is a generic transmission code, which means it applies to OBD-II equipped vehicles that have a charge air cooler temperature sensor (Chevy, Ford, Toyota, Mitsubishi, Audi, VW, etc.) ... Although it is general, the exact repair steps may vary depending on the make / model.

A turbocharger is basically an air pump used to force air into an engine. There are two sections inside: a turbine and a compressor.

The turbine is attached to the exhaust manifold where it is driven by the exhaust gases. The compressor is attached to the air intake. Both are connected by a shaft, so as the turbine spins, the compressor also spins, allowing the intake air to be drawn into the engine. Cooler air provides a denser intake charge to the engine and therefore more power. For this reason, many engines are equipped with an aftercooler, also known as an intercooler. Charge air coolers can be air-to-liquid or air-to-air coolers, but their function is the same - cooling the intake air.

The Charge Air Cooler Temperature Sensor (CACT) is used to measure the temperature and therefore the density of the air coming from the charge air cooler. This information is sent to the powertrain control module (PCM) where it is compared with the intake air temperature (and in some cases the engine coolant temperature and the EGR temperature) to determine the charge air cooler performance. The PCM sends a reference voltage (typically 5 volts) through an internal resistor. It then measures the voltage to determine the temperature of the charge air cooler.

Note: Sometimes the CACT is part of the boost pressure sensor.

Code P007D is set when the PCM detects a high charge air cooler temperature sensor signal on the block 1. This usually indicates an open circuit. On engines with multiple bank rows, bank 1 refers to the cylinder block containing cylinder # 1.

Code severity and symptoms

The severity of these codes is moderate.

Symptoms of a P007D engine code may include:

• Check Engine Light
• Poor engine performance
• Reduced fuel economy
• Vehicle stuck in lame mode.
• Blocking the regeneration of the particulate filter (if equipped)

reasons

Possible reasons for this P007D code include:

• Defective sensor
• Wiring problems
• Defective or limited charge air cooler
• Defective PCM

Diagnostic and repair procedures

Begin by visually inspecting the charge air cooler temperature sensor and associated wiring. Look for loose connections, damaged wiring, etc. Also visually inspect the charge air cooler and air ducts. If damage is found, repair as needed, clear the code and see if it returns.

Then check the technical service bulletins (TSBs) for the problem. If nothing is found, you will need to proceed to the step-by-step system diagnostics.

The following is a generalized procedure as the testing of this code differs from vehicle to vehicle. To accurately test the system, you need to refer to the manufacturer's diagnostic flowchart.

• Pre-test the circuit: use a scan tool to monitor the charge air coolant temperature sensor data parameter. Disconnect the CACT sensor; the scan tool value should drop to a very low value. Then connect the jumper across the terminals. If the scan tool now displays a very high temperature, the connections are good and the ECM can recognize the input. This means the problem is most related to the sensor and not the circuit or PCM issue.
• Check the sensor: Disconnect the charge air cooler temperature sensor connector. Then measure the resistance between the two terminals of the sensor with a DMM set to ohms. Start the engine and check the counter value; the values ​​should decrease gradually as the engine warms up (check the engine temperature gauge on the dashboard to make sure the engine is at operating temperature). If the engine temperature rises but the CACT resistance does not decrease, the sensor is defective and must be replaced.

Check circuit

• Check the reference voltage side of the circuit: Ignition ON, use a digital multimeter set to volts to test the 5V reference voltage from the PCM at one of the two terminals of the charge air cooler temperature sensor. If there is no reference signal, connect a meter set to ohms (with the ignition off) between the voltage reference terminal on CACT and the voltage reference terminal on the PCM. If the meter reading is out of tolerance (OL), there is an open circuit between the PCM and the sensor that needs to be located and repaired. If the counter reads a numeric value, there is continuity.
• If everything is ok up to this point, you will want to check if 5 volts is coming out of the PCM at the voltage reference terminal. If there is no 5V reference voltage from the PCM, the PCM is probably defective.
• Check the ground side of the circuit: Connect a resistance meter (ignition OFF) between the ground terminal on the charge air cooler temperature sensor and the ground terminal on the PCM. If the meter reading is out of tolerance (OL), there is an open circuit between the PCM and the sensor that needs to be located and repaired. If the counter reads a numeric value, there is continuity. Finally, make sure the PCM is well grounded by connecting one meter to the PCM's ground terminal and the other to the chassis ground. Once again, if the meter reads out of range (OL), there is an open circuit between the PCM and ground that needs to be found and repaired.

Related DTC discussions

• 2014 Ford Escape P26B7, P0238, P0234, P0453, P007D, P0236The car does not idle well, smells of gas, has not driven, I am afraid that this may damage the catalytic converter. The car traveled only 55 thousand miles…. 

Need more help with your P007D code?

If you still need help regarding DTC P007D, post a question in the comments below this article.

NOTE. This information is provided for informational purposes only. It is not intended to be used as a repair recommendation and we are not responsible for any action you take on any vehicle. All information on this site is protected by copyright.