How to Complete a Drive Cycle

If you’re a newer mechanic or becoming more educated about diagnosing emissions systems via the OBD-II diagnosis system, you may have heard of the phrase “drive cycle.” A drive cycle is used to test whether repairs to emissions-related components were successfully recognized by the powertrain control module or PCM. The examination itself involves a test drive unique to each vehicle manufacturer. When it is followed as directed, it will help reset the sensors and monitoring equipment inside the PCM and help the mechanic determine if the repairs were completed correctly.

While it would be nice and convenient for the drive cycle to be consistent and easy to follow, in truth it is unique for every manufacturer. Any responsible mechanic understands that the best resource for locating the exact drive cycle instructions for the vehicle they are servicing is the service and repair manual or software program.

As such, the drive cycle instructions we’ve placed below are 5 GENERAL STEPS and should NOT be considered exact steps to follow. Always refer to your vehicle service manual or a professional mechanic who has access to the exact drive cycle instructions — and follow them to ensure accuracy. In most cases, a correct drive cycle will take no longer than 15 minutes to complete.

Step 1: Finish Repairs and Clear all Fault Codes

This is the step that many inexperienced mechanics tend to forget — but it’s the most important. After completing any emissions-related service, you need to clear all OBD-II diagnosis fault codes by using a professional digital scanner. This needs to be completed prior to beginning the actual drive cycle test.

Step 2: Preparing the Vehicle

The next step is to prepare the vehicle for an efficient drive cycle test. There are a few general items that need to be completed in order for the drive cycle test to be effective:

  • Make sure the fuel level is between 30 and 70 percent. If you have completed repairs to emissions systems, especially the EVAP canister or other fuel tank components, the PCM will require a specific amount of fuel/vapor to ensure accurate measurements.
  • Ensure your battery and alternator are in good shape. Jump-starting a vehicle can be a death sentence for the PCM. It can also negatively impact the drive cycle test.
  • Let the vehicle sit for more than 8 hours. The first step of the drive cycle is a cold start. In order for the test to begin, the engine temperature needs to match the outside ambient temperature. It’s also important to keep the vehicle in a temperature-controlled area.
  • Double check the keys and doors. Before you leave the vehicle for the evening, make sure you have all doors closed and no keys inserted into the ignition or locks.

Step 3: Complete the Cold Start

The cold start is just that: an opportunity to start the engine when it’s truly cold. To complete a successful cold start, follow your specific manufacturer’s steps, as each one is unique. Posted below are a few general steps that most drive cycle tests require:

  • Start the vehicle in Park or Neutral
  • Let the vehicle idle for a few minutes
  • Turn on heater, headlights, and front/rear defroster to maximum settings
  • Let vehicle heat up to recommended operating temperature

Step 4: Start the road test

The road test of a typical drive cycle involves a highway and two road driving sessions. The first phase will be a short city driving test. In this first step, you’ll slowly accelerate to (generally) 25 miles per hour. Anytime you stop the vehicle — for stop signs, traffic, or other reasons — come to a complete stop before proceeding.

The second step involves a short highway test. Here you’ll want to slowly accelerate to the recommended speed (again, that recommended by your manufacturer) and hold that steady speed for five miles or more. The most important part of the highway test is slowing down. Most manufacturers recommend simply removing your foot from the accelerator, without pressing the brake pedal, until you decelerate to at least 20 mph — then you can slowly press the brake pedal.

The third road test is a return to city driving, where you repeat what you drove in the first city road test. Once the road test has been completed, pull into a parking spot, let the engine idle for a few minutes, and then shut off the engine.

Step 5: Complete the Final Scan for Error Codes

The last step of the general drive cycle test is to complete a final OBD-II scan for trouble codes. This is something that will verify that the drive cycle test has been completed successfully. Sometimes a drive cycle test will discover other hidden emission problems that did not register initially.

The most important step to complete is following the exact instructions as recommended by your vehicle manufacturer. While the information above is accurate in general, it is not a proven method for all years, makes, and models. When in doubt, always refer to the advice from a professional mechanic.


Next Step

Schedule Evaporative Emission Control Canister Replacement

The most popular service booked by readers of this article is Evaporative Emission Control Canister Replacement. YourMechanic’s technicians bring the dealership to you by performing this job at your home or office 7-days a week between 7AM-9PM. We currently cover over 2,000 cities and have 100k+ 5-star reviews... LEARN MORE

SEE PRICING & SCHEDULING

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Recent Evaporative Emission Control Canister Replacement reviews

Excellent Rating

(152)

Rating Summary
145
3
0
0
4
145
3
0
0
4

Michael

21 years of experience
244 reviews
Michael
21 years of experience
Chevrolet Malibu L4-2.4L - Evaporative Emission Control Canister - Moreno Valley, California
He was always right on time and he was honest with me about what needed to be done. Ty! Mike great experience will use him again!
Chevrolet Cruze - Evaporative Emission Control Canister - Rancho Cucamonga, California
Unbelievable, Michael got here early and right to work. He was professional and courteous. He did the job promised in the time allotted. I will definitely use and recommend Michael to everyone I know. Thank you Michael.

Shaun

10 years of experience
542 reviews
Shaun
10 years of experience
Ford Escape L4-2.5L - Evaporative Emission Control Canister - Litchfield Park, Arizona
Great mechanical knowledge and even better customer service! I will request him again and would recommend him to others!
Kia Optima - Evaporative Emission Control Canister - Phoenix, Arizona
As I have come to expect. Shaun got straight to work. He quickly assessed the situation. The problem was resolved by replacing the needed parts. Shaun is both friendly and professional. I will definitely recommend him to my friends and family.

Norberto

14 years of experience
6 reviews
Norberto
14 years of experience
Kia Spectra L4-2.0L - Evaporative Emission Control Canister Replacement - Austell, Georgia
Norberto communicated continuously with me about the service. He has great customer service skills.

Claud

8 years of experience
475 reviews
Claud
8 years of experience
Lincoln MKS V6-3.7L - Evaporative Emission Control Canister - Macomb, Michigan
Claud is not only pleasant, friendly, and polite, he's an excellent and knowledgeable mechanic. I will be requesting him again for my son's vehicle and for more work on mine. Thank you, Claud!

Need Help With Your Car?

Our certified mobile mechanics make house calls in over 2,000 U.S. cities. Fast, free online quotes for your car repair.

GET A QUOTE

Related articles

Least Expensive Luxury Cars to Insure
You’ve You’ve done well for yourself and are now in the market for a vehicle upgrade. It’s time to ditch the rattletrap you’ve been driving and snag yourself a car with some premium options. How do you decide which car...
What is a Powertrain Warranty and Why Does it Matter?
Let’s Let’s face it - cars aren’t an investment. When you buy a car, it costs you money. When you register and insure it, you spend more. You take out your wallet to put gas in the tank and get...
How to Replace Tie Rod Ends
The The tie rods are just one of many components in your steering system. The steering system consists of a steering wheel, steering column, a steering gear, tie rods and of course the wheels. In short, tie rods (https://www.yourmechanic.com/parts/tie-rod-end) are...

Related questions

can the pcm/ecu/ecm drain the alternator
No, the alternator provides voltage to the battery and other components. The PCM could possibly discharge a battery if it leaves a relay or another circuit on, but most likely is is not the cause of your alternator failure. If...
Engine swap with Ej20x, Ecu question
I will describe a scenario that will work and you can then judge your actual circumstances based on that. The initial issue is not the "country of origin" but rather whether the block and heads are identical, in every respect,...
Can worn brakes cause power train malfunction light to illuminate in 13 ford edge?
It is not likely the brakes are causing the Powertrain light to come on unless you have brakes that are grinding metal to metal. This can cause excessive metal to get on the wheels antilock speed sensor and cause erratic...

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1 (855) 347-2779 · hi@yourmechanic.com