P06D1 Internal Control Module Ignition Coil Control Performance

Description and meaning of DTC p06d1

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, Chevrolet, Toyota, Jeep, etc. When a code P06D1 is stored, it means that the powertrain control module (PCM) has detected an internal processor performance error with the ignition coil control system. Other controllers may also detect an internal PCM performance error (with the ignition coil control system) and cause a P06D1 to be stored. Internal control module monitoring processors are responsible for various controller self-test duties and overall internal control module accountability. Ignition coil control system input and output signals are subject to self-test and are monitored constantly by the PCM and other related controllers. The transmission control module (TCM), traction control module (TCSM), and other controllers also interact with the ignition coil control system. Ignition systems in OBD-II equipped automobiles use high intensity spark generated by battery voltage and a tightly wound induction coil. Ignition spark (coil) timing is controlled by the PCM using input signals from the crankshaft position (CKP) and camshaft position (CMP) sensors. In the coil-over-plug, distributor-less ignition system, each cylinder has its own ignition coil. Each coil is attached to the spark plug with a short plug wire or silicon boot. A constant supply of battery voltage, and a ground pulse from the PCM (applied to a tightly wound induction coil), creates the high-intensity spark (many thousands of volts) required to fire the spark plug of each cylinder. Other ignition systems utilize coil packs which operate in a similar manner except multiple spark plugs are fired from a single coil pack (with multiple towers). In this type of system, multiple cylinders are fired in sequential order. This type of system typically uses much longer high tension spark plug leads to transfer high-intensity spark from the coil pack towers to each spark plug at the appropriate time. With the ignition switch on, the coils/coil pack are supplied a constant supply of battery voltage. The ignition coil releases a high-intensity spark when it receives a ground pulse from the PCM. Whenever the ignition is on and the PCM is energized, ignition coil control system self-tests are initiated. In addition to running internal controller self-tests, the controller area network (CAN) also compares signals from each individual module to ensure that each controller is functioning properly. These tests are performed simultaneously. If the PCM detects an internal discrepancy in the ignition coil control system processor, a code P06D1 will be stored and a malfunction indicator lamp (MIL) may be illuminated. If the PCM detects a problem between any of the on-board controllers, which would indicate an internal ignition coil control system error, a code P06D1 will be stored and a malfunction indicator lamp (MIL) may be illuminated. Multiple failure cycles may be necessary for MIL illumination, depending upon the perceived severity of the malfunction.

p06d1 diagnostic trouble code symptoms

Symptoms of a P06D1 trouble code may include:Drivability issues, including one or more ignition misfiresDiminished engine performancePoor fuel efficiency

DTC p06d1 - possible causes

Causes for this code may include:Faulty PCM or a PCM programming errorOpen or shorted primary/secondary ignition circuitsDefective ignition coils or coil pack/sDefective crankshaft/camshaft position sensor or circuitsOpen or shorted circuit or connectors in the CAN harnessInsufficient control module ground

How to fix OBD-II diagnostic trouble code p06d1

Even to the most experienced and well-equipped professional technician, diagnosing a code P06D1 can prove to be quite a challenge. There is also the issue of reprogramming. Without the necessary reprogramming equipment, it will be impossible to replace a defective controller and complete a successful repair. If there are ECM/PCM power supply codes present, they will obviously need to be rectified before attempting to diagnose a P06D1. There are several preliminary tests that can be performed prior to declaring any controller defective. A diagnostic scanner, a digital volt/ohmmeter (DVOM), and a source of reliable vehicle information will be required. Connect the scanner to the vehicle diagnostic port and retrieve all stored codes and freeze frame data. You will want to write this information down, just in case the code proves to be an intermittent one. After recording all pertinent information, clear the codes and test drive the vehicle until the code is reset or the PCM enters readiness mode. If the PCM enters readiness mode, the code is intermittent and will be more difficult to diagnose. The condition, which caused the P06D1 to be stored, may even need to worsen before a diagnosis can be made. If the code is reset, continue with this short list of preliminary tests. When attempting to diagnose a P06D1, information may be your greatest tool. Search you vehicle information source for technical service bulletins (TSB) that parallel the code stored, vehicle (year, make, model, and engine), and symptoms exhibited. If you find the right TSB, it may yield diagnostic information that will aid you in a major way. Use your source of vehicle information to obtain connector face views, connector pin-out charts, component locators, wiring diagrams, and diagnostic flow charts related to the code and vehicle in question. Use the DVOM to test controller power supply fuses and relays. Test and replace blown fuses as required. Fuses should be tested with the circuit loaded. If all fuses and relays appear to be functioning as intended, a visual inspection of controller related wiring and harnesses is in order. You will also want to check chassis and engine ground junctions. Use your vehicle information source to obtain ground locations for related circuits. Use the DVOM to test ground integrity. Visually inspect system controllers for signs of water, heat, or collision damage. Any controller that is damaged, especially by water, should be considered defective. If controller power and ground circuits are intact, suspect a defective controller or a controller programming error. Controller replacement will require reprogramming. In some cases, you may purchase reprogrammed controllers through aftermarket sources. Other vehicles/controllers will require on-board reprogramming that may only be done through a dealership or other qualified source. Unlike most other codes, the P06D1 is likely caused by a defective controller or a controller programming errorTest system ground integrity by connecting the negative test lead of the DVOM to ground and the positive test lead to battery voltage

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