Thank you.
The p032 code is for a knock sensor. You have knock sensors for the emission system.
Below is the description for you. The sensors are common.
The other code is for the EGR valve deactivation. This comes from carbon build up.
If you do not address these codes, you will have a count down to so many starts left.
Roy
This diagnostic trouble code (DTC) is a generic powertrain code, which means that it applies to OBD-II equipped vehicles. Although generic, the specific repair steps may vary depending on make/model. Knock sensors are used to detect engine pre-detonation (engine knock or ping). The knock sensor (KS) is usually a two wire sensor. A 5 volt reference is supplied to the sensor and there is a signal return from the knock sensor to the PCM (powertrain control module). For this DTC it refers to the #3 knock sensor, refer to a vehicle specific service manual for the specific location. If there are multiple banks of th engine, this is the bank of cylinders that contains cylinder #1. The sensor signal wire informs the PCM when a knock occurs and in what degree of severity. The PCM will retard the spark timing to avoid pre-detonation. Most PCMs have the ability to learn spark knock trends in the engine during normal operation. If the PCM determines that the knock is out of the ordinary or that the noise level is abnormally high, P032B may set. If the PCM senses that the knock is severe and cannot be eliminated by retarding the spark timing, P032B may set. Keep in mind that knock sensors cannot distinguish between a knock from pre-detonation or one from engine problems. Symptoms Symptoms of a P032B DTC may include: MIL (Malfunction Indicator Lamp) illumination Audible knocking from the engine compartment Pinging from engine under acceleration Causes Potential causes of a P032B code include: Knock sensor has failed Knock sensor connector is damaged Knock sensor circuit is open or shorted to ground Knock sensor circuit is shorted to voltage Moisture in knock sensor connectors Incorrect fuel octane PCM has failed Possible Solutions If an engine knock can be heard, fix the source of the mechanical problem first then retest. Make sure the proper octane of fuel was used in the engine. Using lower octane fuel than what is specified can cause a ping or pre-detonation and may cause P032B. Unplug the knock sensor and check for water or corrosion in the connector. If the knock sensor has a seal, verify there is no coolant from the engine block fouling the sensor. Repair as necessary. Turn ignition to run position with engine off. Ensure that 5 Volts are present at the KS #3 connector. If there is, check for proper resistance between KS terminal and engine ground. You will need a vehicle specification for this. If resistance is out of specification, replace the knock sensor. If resistance is normal, plug KS back in and idle the engine. Using a scan tool in data stream, observe KS value. Does it indicate a knock is present at idle? If so, replace the knock sensor. If the knock sensor shows no knock at idle, then tap on the engine block while observing the knock signal. If it doesn't show a signal that corresponds with the taps, replace the knock sensor. If it does, verify the knock sensor wiring isn't routed next to ignition wires. If there was no 5 volts present at the knock sensor connector while unplugged with KOEO (Key on engine off) then go back to the PCM connector. Turn ignition off and clip the knock sensor 5 volt reference wire in a location that is easy to repair (Or remove the wire from the PCM connector). With KOEO, check for 5 volts on the PCM side of the clipped wire. If 5 volts isn't present, suspect a bad PCM. If 5 volts IS present, repair short in 5 volt reference circuit. Since the reference circuit is a shared circuit, you will need to check all engine sensors that are fed a 5 volt reference. Unplug each sensor one at a time until the reference voltage returns. When it returns the last sensor you plugged in is the shorted sensor. If no sensors are shorted, check the wiring harness for short to voltage on reference circuit.
P2bac
OBD II fault code P2BAC is a generic code that is defined as “NOx Exceedence Deactivation of EGR”, and is set when the PCM (Powertrain Control Module) detects that the levels of NOx (oxides of nitrogen) in the exhaust gas exceeds a maximum allowable threshold as the a result of the EGR (Exhaust Gas Recirculation) system being deactivated. Note that this code only applies to vehicles that are fitted with EGR systems.
It should be noted that code P2BAC is informational in nature, and is set only to alert the driver that the EGR system has been deactivated. As such, this code cannot be diagnosed in the same manner as most other codes; however, the underlying reason why the EGR system has been deactivated should be investigated and corrected without delay. As a point of interest, code P2BAC will always be accompanied by one or more other exhaust system related codes, and repairing these codes will resolve P2BAC as well.
The purpose of EGR is to introduce metered quantities of exhaust gas into the engine along with the air fuel mixture to reduce combustion temperatures to below the point (about 2800 deg F) where harmful levels of NOx forms as a result of the combustion process. In practice, the introduction of exhaust gas has a quenching effect on the combustion flame, and it is this quenching effect that limits or prevents the formation of NOx.
However, since the introduction of exhaust gas dilutes the air/fuel mixture, EGR only occurs during certain conditions, such as during sustained high speed driving, or under other conditions where the introduction of exhaust gas will not affect combustion negatively. For this reason, EGR never occurs during idling or at low engine speeds when the process could cause the engine to stall, or to lose significant amounts of power as the result of the dilution of the air/fuel mixture.
In terms of operation, the PCM uses input data from several engine sensors, such as the coolant temperature, engine speed/load, and exhaust gas temperature sensors to determine an appropriate EGR strategy. When conditions are deemed suitable, the PCM opens a dedicated EGR valve (that is connected to the exhaust manifold) to allow exhaust gas to enter the engine under engine vacuum. However, the PCM is able to control the degree to which the EGR valve opens, and furthermore, to monitor the amount of gas that flows through the valve, based on the engine speed and the degree to which the EGR is opened via a dedicated EGR valve position sensor.
As a practical matter on most applications, the PCM has the ability to deactivate the EGR system should malfunctions, failures, or issues occur that prevent the PCM from controlling the EGR system effectively. Should the EGR system be deactivated for whatever reason, excessive amounts of NOx will necessarily be formed during the combustion process, and the PCM will therefore set code P2BAC and illuminate a warning light as a warning to the driver that the EGR system had been deactivated or disabled.
Saturday, September 26th, 2020 AT 4:02 PM
