P1002 Ignition Key Off Timer Performance Too Slow
OBD2 Error Codes

P1002 Ignition Key Off Timer Performance Too Slow

21.11.2023 /

P1002 – OBD-II Trouble Code Technical Description

The ignition key off timer is too slow

What does the fault code mean P1002?

Trouble codes may vary depending on the vehicle manufacturer and model. The P1002 code may be unique to a specific manufacturer and its meaning may vary.

To find out the exact meaning of the P1002 trouble code for your specific vehicle, you should consult your repair documentation or contact an auto repair shop who can provide information specific to your vehicle. You can also use a diagnostic scanner to read the error code and get more details about the problem.

Possible reasons

Without specific information about the vehicle's make and model, it is difficult to provide precise reasons for the P1002 code. However, the general approach to diagnosing error codes is as follows:

  1. Manufacturer documentation: Check the repair and maintenance manual for your specific vehicle. There may be specific fault codes and their meanings listed there.
  2. Diagnostic scanner: Use a scan tool to read more information about the P1002 code. The scanner can provide details about which systems or components it relates to.
  3. Car service: Contact a car service center for more detailed diagnostics. Technicians will be able to use specialized equipment and experience to identify a specific problem.

Without specific information about your vehicle's make and model, and without access to additional diagnostic information, it is difficult to provide more definitive reasons for the P1002 code.

  • Faulty ignition switch
  • Ignition switch harness is open or shorted.
  • Ignition switch circuit, poor electrical contact
  • Faulty cabin compartment assembly (CCN)

What are the symptoms of a fault code? P1002?

Engine light is on (or engine service soon light)

How to diagnose a fault code P1002?

Diagnosing the P1002 trouble code requires a systematic approach. Here are a few steps you can take:

  1. Using the diagnostic scanner:
    • Connect the diagnostic scan tool to your vehicle's OBD-II port.
    • Read trouble codes, including P1002, for more information about the problem.
  2. Internet and manufacturer resources:
    • Use your vehicle manufacturer's resources, such as official websites or technical manuals, to find out specific information about the P1002 code for your model.
  3. Checking the fuel system:
    • Code P1002 may be related to problems in the fuel system. Check the fuel pump, fuel filter and fuel injectors for malfunctions.
  4. Checking the intake system:
    • Check the intake system for air leaks or problems with the mass air flow (MAF) sensors and manifold air pressure sensors.
  5. Checking oxygen sensors (O2):
    • Oxygen sensors can be linked to fuel system regulation. Check them for proper operation.
  6. Checking the ignition system:
    • Problems with the ignition system can cause errors. Check the spark plugs, ignition coils and other ignition system components.
  7. Leak search:
    • Check the system for air, fuel or other fluid leaks as these may affect engine performance.
  8. Contact the professionals:
    • If you are not confident in your diagnostic skills or if the problem remains unclear, it is better to contact a professional auto repair shop. Specialists will be able to conduct more in-depth diagnostics using specialized equipment.

Please note that these steps are provided as a general guide and the specific steps may vary depending on the make and model of your vehicle.

Diagnostic errors

When diagnosing a P1002 code, and generally when working with vehicle trouble codes, there are some common errors that may occur. Here are a few of them:

  1. Ignoring other error codes: Having multiple error codes can provide a more complete picture of the vehicle's condition. Don't ignore other codes that may also be present.
  2. Replacement of components without additional diagnostics: Simply replacing the components indicated by the error code without further diagnostics can result in unnecessary parts and labor costs.
  3. Unsatisfactory check of electrical connections: Problems with electrical connections such as connectors and wiring can cause errors. Make sure wiring is in good condition and check electrical connections before replacing components.
  4. Failed calibration or programming of new components: Some components, such as sensors, may require calibration or programming after replacement. Remember to perform this step if necessary.
  5. Eliminating problems with the intake system: P1002 codes are sometimes associated with intake system problems. Incorrect operation of the mass air flow (MAF) sensors or manifold air pressure sensors can cause this error.
  6. Incorrect interpretation of error code: Different manufacturers may use the same code for different problems. Be sure to check the P1002 code for your specific vehicle model.
  7. Unaccounted external factors: Some errors may be caused by temporary problems or factors such as poor fuel quality. When diagnosing, take into account external circumstances.

In the case of code P1002, the key is to take a systematic approach to diagnosis and thoroughly investigate all possible causes. If you have any doubts or if the problem remains unclear, it is best to contact a professional auto mechanic or dealer.

How serious is the fault code? P1002?

The Transmission Control Module (TCM) uses the key off period to perform other diagnostic tests. To ensure the correct conditions for enabling diagnostic tests, the TCM checks that the ignition off timer is functioning correctly. The ignition off timer value is stored in the cabin compartment node (CCN). The CCN sends the ignition switch timing message to the Totally Integrated Power Module (TIPM). TIPM transmits this time via the CAN bus.

The TCM receives the message and compares the ignition OFF timer value with the engine coolant temperature when the ignition is OFF and the engine coolant starting temperature message. If the ignition cut time is less than a calibrated value based on the engine coolant ignition cut temperature and the engine coolant crank temperature, a diagnostic trouble code (DTC) will be set.

What repair will help eliminate the code? P1002?

Error codes, including P1002, indicate problems with the vehicle's system. Resolving a P1002 code will require diagnosing and addressing the root cause. Here are some possible repair steps:

  1. Checking and replacing sensors: Code P1002 is sometimes associated with problems with sensors such as the mass air flow (MAF) sensors or manifold air pressure sensors. Carry out diagnostics and, if necessary, replace faulty sensors.
  2. Checking and cleaning the fuel system: Problems with the fuel system can cause errors. Check the fuel pump, fuel filter and injectors for problems and, if necessary, clean or replace them.
  3. Checking the intake system: Air leaks or problems with the intake system can cause the P1002 code. Check the system for leaks and ensure connections are secure.
  4. Checking the ignition system: Problems with the ignition system, such as faulty spark plugs or ignition coils, can cause errors. Diagnose and replace faulty components.
  5. Checking the ignition switch off time: Make sure the ignition off timer is working correctly. If necessary, replace the faulty timer.
  6. Checking electrical connections: Incorrect electrical connections may cause errors. Check wiring and connectors for damage or corrosion.
  7. Calibration and programming: Some components, such as sensors, may require calibration or programming after replacement.

It is important to note that these recommendations are provided in general terms and specific actions may depend on your vehicle make and model, as well as additional diagnostic information. If you do not have experience in self-repair, it is recommended to contact a professional car service for a more accurate diagnosis and elimination of the problem.

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