Toyota · Lexus · Scion
TOYOTA & LEXUS
DRIVE CYCLE GUIDE
How Toyota and Lexus readiness differs by monitor, why EVAP often takes longer, and when the exact confirmation driving pattern is necessary.
Drive cycle at a glance
Fuel level
About ¼ to ¾ tank
Cold soak
Often overnight
Warm engine
Reach closed loop
Steady cruise
Monitor-specific speed/load
Key-off
EVAP may test after parking
TOYOTA USES MONITOR-SPECIFIC PATTERNS
Toyota and Lexus do not use one universal drive cycle for every vehicle. Service information often provides a separate confirmation pattern for catalyst, oxygen-sensor, EVAP, EGR/VVT, and other monitors. The exact engine and calibration matter.
Before trying a pattern
- Do not clear codes again.
- Confirm there are no active or pending faults related to the incomplete monitor.
- Use roughly ¼ to ¾ of a tank when working on EVAP readiness.
- Begin with a true cold soak when the service procedure calls for it.
- Use a scan tool to identify the exact monitor that remains incomplete.
Catalyst and oxygen-sensor monitors
These commonly need full operating temperature, stable closed-loop fuel control, moderate acceleration, and a steady cruise in the 40–60 mph range. Smooth throttle matters; hard acceleration can move the vehicle outside the monitor’s enabling window.
EVAP monitor
EVAP can be the slowest Toyota monitor because it may need a narrow fuel level, acceptable ambient temperature, an overnight cold soak, normal driving, and a long key-off period. Filling the tank completely can stop some EVAP tests from running.
EGR/VVT and other monitors
These may require particular engine speed, load, coolant temperature, and deceleration conditions. Several normal mixed-driving trips may be more effective than repeatedly forcing one generic route.
Toyota’s owner-manual guidance
Toyota manuals explain that readiness codes erased by a discharged or disconnected battery are set again during ordinary driving, but driving habits can keep some monitors incomplete. If the exact monitor does not complete, use Toyota service information for the vehicle’s confirmation driving pattern.
Toyota monitor-specific patterns
THE SHAPE OF THE DRIVE MATTERS.
These original Smog Dawg diagrams preserve the speed, time, temperature, idle, and soak relationships shown in Toyota’s monitor-specific confirmation patterns. They are a visual reference—not a promise that every Toyota or Lexus uses the same pattern.
Toyota Drive Pattern 1
EGR monitor
Legacy confirmation pattern for Toyota engines other than the 1FZ-FE.
- Warm the engine at idle for 10 minutes.
- Drive steadily between 43 and 56 mph for 3–5 minutes.
- Return to idle for 3–5 minutes.
- Repeat the cruise and idle phases once more.
Use note: Applies only where Toyota service information identifies this EGR pattern; verify the exact engine and model year.
Toyota Drive Pattern 2
EGR monitor — 1FZ-FE engine
Cruise and idle phases are repeated for the engine-specific EGR check.
- For a 1FZ-FE engine, accelerate smoothly into the 43–56 mph range.
- Hold that range for 3–5 minutes, then idle for 3–5 minutes.
- Repeat the cruise and idle phases a second time.
Use note: This is the 1FZ-FE-specific legacy pattern, not a universal Toyota EGR procedure.
Toyota Drive Pattern 3
Catalyst monitor — O2S type
Warm fully, complete the temperature-dependent cruise, then hold the lower cruise range.
- Warm the coolant to at least 176°F.
- Hold 40–50 mph for 7 minutes when intake air is below 50°F, or 3 minutes when it is above 50°F.
- Reduce speed smoothly and hold 35–45 mph for 7 minutes.
Use note: O2S-type catalyst pattern. Intake-air temperature changes the first cruise duration.
Toyota Drive Pattern 4
Catalyst monitor — A/F sensor type
After warm-up and a steady cruise, vary speed smoothly within the lower band.
- Warm the coolant to at least 176°F.
- Hold 40–50 mph for the temperature-based period shown.
- For the next 16 minutes, vary speed gently between 35 and 45 mph instead of locking onto one exact speed.
Use note: A/F-sensor catalyst pattern. Vary speed gradually and safely; do not force the cycle in traffic.
Toyota Drive Pattern 5
EVAP monitor — internal pressure / non-intrusive
Cold-soak preparation is followed by a 45 mph phase and repeated lower-speed phases.
- Complete the warm-up and cold-soak conditions shown for the applicable vehicle.
- Drive at about 45 mph for 5 minutes.
- Over the next 15 minutes, alternate the lower-speed 25 mph phases with idle periods.
- Keep the fuel level in the vehicle’s required EVAP range—commonly about ¼ to ¾ tank.
Use note: Fuel level, ambient temperature, key-off time, and a sealed fuel system can all determine whether EVAP runs.
Toyota Drive Pattern 6
EVAP monitor — vacuum pressure / intrusive
Soak and warm-up are followed by a brief 3,000 rpm event and an extended idle.
- Begin only after the required soak and warm-up conditions are satisfied.
- Raise engine speed to approximately 3,000 rpm for 10 seconds.
- Return to idle and allow 15–50 minutes for the monitor or a diagnostic result to complete.
Safety: Do this only where prolonged idling is permitted and the vehicle can be ventilated safely.
Use note: The test can complete when the readiness monitor sets or a DTC is recorded. Never hold engine speed if unsafe or prohibited.
Toyota Drive Pattern 7
EVAP monitor — without leak detection
Warm the engine, then repeat the 43–56 mph cruise and idle sequence.
- Warm the coolant to at least 181°F.
- Hold 43–56 mph for 3–5 minutes, then idle for 3–5 minutes.
- Repeat the same cruise and idle sequence once more.
Use note: Verify that this older non-leak-detection pattern matches the vehicle before attempting it.
Toyota Drive Pattern 8
EVAP monitor — Prius
After the required soak, hold the specified highway range for the full period.
- Start after the required Prius soak conditions are met.
- Accelerate smoothly into the 50–65 mph range.
- Remain in that range for approximately 15 minutes when traffic and posted limits allow.
Use note: Prius applicability varies by generation and calibration. Confirm the exact Toyota service procedure first.
Toyota Drive Pattern 9
Oxygen sensor monitor — front and rear O2S
Timed 25 mph and idle phases are repeated in the sequence specified by Toyota.
- Idle for more than 2 minutes.
- Drive at about 25 mph and above 900 rpm for more than 50 seconds.
- Return to idle for more than 40 seconds.
- Repeat the timed drive-and-idle portions in the count required by the exact Toyota procedure.
Use note: Repeat counts in Toyota service information matter. Identify the exact incomplete O2S monitor before using the sequence.
Toyota Drive Pattern 10
Oxygen / air-fuel-ratio sensor monitor
A warm highway phase is followed by timed 25 mph and idle repetitions.
- Idle for more than 2 minutes.
- Drive between 40 and 70 mph, while remaining within the shown rpm range, for more than 3 minutes.
- Idle for more than 10 seconds.
- Alternate 25 mph phases lasting more than 40 seconds with idle periods longer than 10 seconds, using the repeat count in the service procedure.
Use note: This front A/F-sensor and rear O2S pattern is engine- and calibration-specific.
Toyota Drive Pattern 11
Oxygen / A/F sensor heater monitor
Hold idle for nine minutes, then drive above 25 mph for two minutes.
- Start the engine and let it idle continuously for 9 minutes.
- Then drive above 25 mph for 2 minutes.
- Recheck readiness only after stopping safely; never watch the scan tool while driving.
Use note: A simple-looking pattern can still require specific starting conditions; use the correct model-year service information.
STILL NOT READY?
Bring the year, make, model, engine, fuel type, and a list of the incomplete monitors. The Smog Dawg can help you understand what the vehicle is reporting and what should happen next.