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Obd-Ii Drive Cycles Jeep Grand Cherokee WK2

Drive Cycles ~4768 words

* PLEASE READ THIS FIRST *

Note. This article applies to OBD-II equipped vehicles only.

Note. Drive cycles not listed are not available from manufacturer, but are probably similar to like models listed here.

Note. For 1995-99 models, also see TSB 25-02-98 NON TURBO GAS ENGINE I/M OBDII "CARB" READINESS MONITOR INFORMATION .

2.0L FWD FCC PCM Equipped Vehicles

The following procedure has been established to assist technicians in the field with enabling and running OBD-II Monitors on 1995 Avenger, Neon, Sebring & Talon 2.0L models equipped with FCC PCM. The order listed in the following procedure is intended to allow the technician to effectively complete each monitor and to set the CARB Readiness Status in the least time possible.

Upstream O2S Monitor

Perform the following

  1. Ensure engine is at normal operating temperature, above 170°F.
  2. Operate the vehicle for a period of time, more than 2 minutes, at a speed above 25 MPH.
  3. Bring the vehicle to a complete stop, with foot on the brake and transaxle in gear (A/T) or neutral (M/T).

The monitor should run while vehicle is stopped with the engine idling. Wait for a few minutes to allow the monitor to complete before turning off engine.

Downstream O2 Monitor

Perform the following

  1. Ensure engine is at normal operating temperature, above 170°F.
  2. Decel Fuel Shut-off is Active.
  3. Minimum Engine RPM = 1600 RPM.
  4. Upstream O2S is less than .471 volts.

The PCM begins the Downstream O2S rationality test. The PCM looks at the Downstream O2S volts for 5 seconds, if less than .295 volts, the test passes. If the Downstream O2S is greater than .295 volts, the test increments a count of 1 and the test is done again. A count of 3 will set a DTC and store Freeze Frame Data.

Rich (High Voltage) Output Test

Perform the following

  1. Engine coolant temperature is above 170°F.
  2. At WOT TPS voltage for more than 2 seconds.
  3. Upstream O2S volts is above .490 volts.

The PCM begins the Downstream O2S rationality test. The PCM looks at Downstream O2S volts for 5 seconds, if more than .608 volts, the test passes. If the Downstream O2S is less than .608 volts, the test increments a count of 1 and the test is done again. A count of 3 will set a DTC and store Freeze Frame Data.

EGR Monitor

Perform the following

  1. EGR Solenoid is enabled.
  2. Vehicle speed more than 3 MPH.
  3. Time from Start/Run is more than 2:09 minutes.
  4. The Fuel Control is in Closed Loop.
  5. No Limp-In or OBD-II Monitor faults present.
  6. Purge is enabled.
  7. Engine coolant temperature more than 144°F.
  8. MAP Range during Monitor: 11.70" to 16.20".
  9. RPM Range during Monitor: 2200 RPM to 2400 RPM.
  10. Actual TP Sensor above minimum TP Sensor Range: .295 volts to 1.0 volt.
  11. Maximum Short Term Adapt = +6%.
  12. The PCM stores the EGR on Short Term Adaptive Memory value.

The PCM begins the monitor. The PCM turns off the EGR Solenoid. The PCM uses a modified ramp rate for Short Term Adaptive Memory. The PCM stores the EGR off Short Term Adaptive Memory value. The PCM determines the Short Term Adaptive Memory shift. Between 3% to 17% Short Term shift adaptive memory, an EGR Monitor passes. Less than 3% rich or more than 17% shift rich will run the test again. 3 failed tests will equal a 1 trip EGR Monitor Failure.

Catalyst Monitor

Perform the following

  1. Engine coolant temp above 170°F.
  2. Accumulated open throttle time of 3:00 minutes.
  3. Vehicle speed above 20 MPH
  4. TP Sensor is open for 4:00 minutes (A/T) or 5:00 minutes (M/T).
  5. MAP range during monitor: 14.60" to 18.20".
  6. The RPM range during monitor: 1500 RPM to 2000 RPM.
  7. Time spent in MAP and RPM ranges should be more than 3.9 seconds.
  8. No Limp-In or OBD-II Monitor faults present.

Note. If the vehicle speed drops below 20 MPH or the throttle is closed, the timer counts back down until the vehicle speed is above 20 MPH, then the counter resumes counting up again.

The PCM begins the monitor. The PCM starts a timer and counts the Upstream O2S switches and counts the Downstream O2S switches until 20 seconds is reached. After 20 seconds is reached, the PCM divides the Downstream O2S switches by the Upstream O2S switches to determine the switching frequency. If it is less than the calibrated amount, the catalyst monitor passes. If it is more than the calibrated amount, the test increments a count of 1 and the test is done again. A count of 2 will cause the monitor to fail 1 trip and store Freeze Frame Data.

Purge Flow Monitor

Perform the following

  1. A Purge Free Cell Update must take place.
  2. A/T transmission is in gear at idle, Cell 12, or M/T is in Cell 13.

To perform a Purge Free Cell Update

  1. The engine must be running in Closed Loop.
  2. Engine coolant temperature above 170°F for more than 1 minute.
  3. The PCM attempts a Purge Free Updated every other time the Cell is entered.
  4. The engine must remain in the Cell for 20 seconds to complete a Purge Free Update.
  5. The Purge Free Cell will update once the Purge Duty Cycle returns from 0% to some other value, and the PCM begins Stage I of the Purge Flow Monitor.

Stage I: If any of the Purge Normal Cells are richer than their Purge Free Cell Mirrors by the calibrated amount, Stage I Passes. Stop testing this trip. Stage I Pass Specifications. If less than the specification, continue with Stage II.

Stage II: Perform the following

  1. Delay for 1 second from Stage I.
  2. Minimum BARO more than 21.70".
  3. Maximum Throttle Change (TPS) less than .060 volts.
  4. Maximum MAP vacuum change less than 0.50" vacuum.
  5. Maximum RPM change less than 96 RPM.
  6. Maximum charging system voltage change less than 0.99 volts.
  7. Maximum generator duty cycle change less than 14% duty cycle.

The PCM updates the Cell with purge on for 1 second. The PCM updates the Cell with purge off for 2 seconds. In Stage II, the PCM subtracts the Purge Normal Cell value from the Purge Free Cell Value. If the difference is greater than calibrated amount, Stage II Passes and no further testing is performed that trip.

If the difference is less than the calibrated amount, continue testing. The PCM averages the Short Term Adaptive Memory percent and the RPM for 3 seconds. The PCM stores the averaged Short Term Adaptive Memory and the RPM value and then reads and stores the IAC Steps. The PCM begins increasing the Purge Flow (by increasing the Purge Solenoid Duty Cycle) .40% every 44 milliseconds. The PCM begins a new averaging for Short Term Adaptive Memory and RPM. The PCM continues taking new IAC step readings. The PCM compares Short Term Adaptive, RPM and IAC Steps from before the Purge Duty Cycle was increased during Stage II until 1 of 3 things happen

  1. Short Term Adaptive % changes by 5.0%.
  2. IAC Steps change by 1 Step.
  3. RPM changes by approximately: 100 RPM

If any of the above happen, Stage II passes. If not and 99% Purge Solenoid Duty Cycle is reached, Stage II Fails. This will cause the Purge Flow Monitor to Fail 1 Trip and Freeze Frame Data will be stored.

Secondary Air Monitor

Stage I runs when the Secondary Air Solenoid is on (Upstream Air Added). The Secondary Air Solenoid is switched on, or goes from blocked to upstream air under the following conditions

  1. Secondary Air Solenoid on Times: Engine Running. Coolant Temp after Start-Up below 120°F ECT = 2:00 minimum, above 120°F ECT = 0:20 minimum.
  2. In Decel and all following items met: Engine Temp above 0°F. Engine Temp below 154°F. MAP above 19" vacuum. RPM above 1220 RPM. RPM below 3500 RPM.

The PCM begins Stage I: The PCM monitors the Downstream O2S while the Secondary Air Solenoid is on (in the Upstream mode). If Downstream O2S is below .725 volts, the PCM goes to Step A. If Downstream O2S is above .745 volts, the PCM goes to Step B.

A. If the Downstream O2S is less than .725 volts, the PCM waits for the Secondary Air to be turned off. After the Secondary Air is turned off, the PCM monitors the Downstream O2S for 2 Seconds. If the Downstream O2S voltage is now above .745 volts, Stage I Passes and all testing is stopped this trip. If it is not above .745 volts, Stage I fails and Stage II begins.

Or

B. If the Downstream O2S is greater than .745 volts with the Secondary Air Solenoid on (Upstream Air Mode), then the PCM fails Stage I and Stage II begins. The PCM begins Stage II after the following

  1. Stage I Failed.
  2. Fuel System in Closed Loop.
  3. At Idle.
  4. Test not already failed this Trip.
  5. RPM above 700 RPM.

In Stage II, the PCM richens the mixture until the Downstream O2S switches rich by doing the following

  1. The PCM changes the Upstream O2S rich switch point from .490 volts to 1.02 volts.
  2. The PCM increments a counter by 0.02 volts every 2 seconds.
  3. The PCM stops updating Long Term Adaptive Memory.
  4. The PCM turns off the purge solenoid (No Purge Flow).
  5. The PCM uses the Purge Free Idle Cell value for fuel calculations.
  6. The PCM modifies the Fuel Ramps of Short Term Adaptive Memory.

If the Downstream O2S does not switch to rich (above .745 volts) before the Upstream O2S counter gets to 1.12 volts, the PCM fails Stage II and the Secondary Air Monitor fails 1 trip and Freeze Frame Data is stored.

Or

If the Downstream O2S switches to rich (above .745 volts) before the Upstream O2S counter gets to 1.196 volts, the PCM turns the Secondary Air Solenoid on (Upstream Air Mode). The PCM resets Short Term Adaptive Memory to -1.5% and begins reducing the Short Term Adaptive Memory by -0.39% every 0.430 seconds until the Upstream O2S is below .859 volts.

Once the Upstream O2S is below .859 volts, the PCM holds the Short term Adaptive Memory at its present value. The PCM checks to see if the Downstream O2S has switched below .725 volts. If so, the PCM Passes Stage II and no further Testing is done this Trip. If the Downstream O2S has not switched below .725 volts, wait a maximum of 20 Seconds. If either 20 Seconds passes or the Downstream O2S has not switched below .725 volts, the PCM fails Stage II and the Secondary Air Monitor fails 1 trip and Freeze Frame Data is stored.

Oxygen Sensor Heater Monitor (Both Upstream & Downstream O2)

Perform the following

  1. Engine running at least 5 minutes.
  2. Shut the Engine off.
  3. Minimum battery voltage with engine off is more than 10 volts.
  4. The PCM delays for 5 seconds.
  5. The PCM keeps the power to the O2S Heaters off (keeps the ASD Relay off for now).
  6. The PCM begins pulsing the O2 Sensors with 5 volts for 35 milliseconds every 1.6 Seconds.
  7. The PCM then monitors the O2S voltage before and during each pulse.

If the initial voltage difference between the Pulse on and Pulse off minus the next Pulse on and Pulse off difference is more than 1.5 volts, the Oxygen Sensors are too cool and all testing is stopped. If the initial voltage difference minus the next voltage difference is less than 1.5 volts, the Oxygen Sensors are properly heated and the testing continues. Next, the cool-down phase begins. The PCM continues to pulse the Oxygen Sensor with 5 volts and then back to .45 volts. The PCM monitors and stores the first Pulse on and the first Pulse off voltages and then subtracts them from each other. The PCM then subtracts the voltage difference from each new set of Pulse on and Pulse off reads, to the difference of the voltage reads taken just before.

Once the PCM sees a difference between readings of at least .490 volts, the sensors have properly cooled and the O2 Sensor Heaters are ready to be tested. If 3:40 minutes have elapsed and still a voltage difference of .490 has not been reached, the PCM begins heating the O2 Sensor that has cooled and disables testing on the O2 Sensor which has not fully cooled. If all Oxygen Sensors have cooled properly, the PCM then grounds the ASD Relay (to provide the O2 Heaters with voltage). The PCM continues to Pulse 5 volts to all O2 Sensors after the ASD Relay is turned on.

The O2 Heaters can pass by one of two methods: First, with the 5-volt Pulse on, the PCM compares to the next 5-Volt Pulse on value. If the voltages between spikes (on Pulses) has decreased by .157 volts. The O2 Heater monitor passes and all testing is stopped this trip. Secondly, the voltage difference between the Pulse on voltage is compared to next Pulse on voltage and is less than the prior voltage Pulse on, for 10 out of the 30 Pulses (33%), this indicates a Heating Trend and the O2 Heater Passes. If neither a Heating Trend nor the Absolute voltage is reached, the O2 Heater monitor fails 1 trip and the Freeze Frame Data is stored.

Misfire Monitor

Misfire monitor is continuously running during engine operation. For the Misfire monitor to be enabled, the Adaptive Numerator must be learned since battery disconnect and every Key on there after (known as Power-on learning). The Adaptive Numerator is a software learning routine that tells the PCM where the crankshaft slots are. Since every crankshaft is different, the PCM must learn exactly where its particular crankshaft slots are; otherwise its RPM calculations would be wrong. After a battery disconnect and then a power-up of the PCM, the Adaptive Numerator is set to a value which it would be at if everything were perfect (crankshaft slots, sensors, PCM hardware, etc.). If the Adaptive Numerator is equal to the default value, no learning has happened and the Misfire Monitor will not run. To allow the PCM to learn the Adaptive Numerator, the following must happen

  1. Open Throttle.
  2. Engine Cool Temp Above 100°F; Or if below 100°F, Wait For ECT Rise Of 59°F.
  3. More Than 10" Vacuum.
  4. Above 1200 RPM.
  5. Below 3000 RPM - A/T.
  6. Below 3488 RPM - M/T.

Once the PCM has learned the Adaptive Numerator, the Misfire Monitor will run.

Fuel System Monitor

Fuel System monitor is continuously running during engine operation.

OBD-II Monitor Enabling Criteria RWD/4WD JTEC PCM Equipped Vehicles

The following procedure has been established to assist technicians in the field with enabling and running OBD-II Monitors on RWD/4WD trucks and Jeep models equipped with Jeep/Truck Engine Controller (JTEC). The order listed in the following procedure is intended to allow the technician to effectively complete each monitor and to set the CARB Readiness Status in the least time possible.

Note. Once the monitor run process has begun, do not turn off the ignition. By turning the ignition key off the monitor enabling conditions will be lost. Only the O2 Heater Monitor runs after key off.

Note. By performing a battery disconnect, or erasing diagnostic trouble codes, the CARB Readiness and all additional OBD information will be cleared.

Monitor Run Process Tip

The following is an outline of the Monitoring Run Process, including suggestions and tips in order to aid in the process of meeting the enabling criteria for these monitors. The most efficient order has been outlined below. For example, the first two monitors have very similar enable criteria; it is possible that the Evaporative Leak Detection Monitor will run during the O2 Sensor Heater Monitor.

Evaporative Leak Detection Monitor (If Equipped With An LDP System)

This monitor requires a cold start, usually an overnight soak or parked for at least 8 hours without the engine running. The engine coolant temperature must be within 10 degrees of ambient/battery temperature, and the sensed Ambient (outside) Temperature must be between approximately 40°F and 90°F.

O2 Sensor Heater Monitor

This monitor requires a cold start, usually an overnight soak or parked for at least 8 hours without the engine running. The engine coolant temperature must be within 10 degrees of ambient/battery temperature, and the sensed Ambient (outside temperature) must be between approximately 0°F and 100°F. The monitor should run directly after starting the engine.

The vehicle will need to be driven at a steady highway speed for a few minutes. The monitor will typically enable and start running at approximately 35 to 40 MPH for 2.5L and 4.0L engines, 50 to 60 MPH for all others). If the vehicle is equipped with a manual transmission, using 4th gear may assist in meeting the monitor running criteria.

O2 Sensor Monitor

The vehicle will need to be driven for a period of time at a steady highway speed. Approximately 35 to 40 MPH for 2.5L and 4.0L engines, 50 to 60 MPH for all others and brought to a stop for a short period of time with the A/T left in Drive. The O2 Monitor will not run in Park or Neutral, except for vehicles equipped with a M/T.

Purge Monitor

The Purge Free cells must be updated before the monitor will run. The enabling conditions are similar to the O2 Sensor Monitor enabling conditions such as, the vehicle will need to be driven for a period of time at highway speeds and brought to a complete stop. The Purge Flow Monitor will attempt to run every OTHER throttle closure. If all of the parameters are met and it still does not run, with your foot firmly on the Brake, quickly open and close the throttle, this will allow another Purge Free update, and then the Purge Flow Monitor should run.

Misfire monitor is continuously running during engine operation. For the Misfire monitor to be enabled, the Adaptive Numerator must be learned since battery disconnect and every Key on there after (known as Power-on learning).

The Adaptive Numerator is a software learning routine that tells the PCM where the crankshaft slots are. Since every crankshaft is different, the PCM must learn exactly where its particular crankshaft slots are; otherwise its RPM calculations would be wrong. After a battery disconnect and then a power-up of the PCM, the Adaptive Numerator is set to a value which it would be at if everything were perfect (crankshaft slots, sensors, PCM hardware, etc.). If the Adaptive Numerator is equal to the default value, no learning has happened and the Misfire Monitor will not run.

To allow the PCM to learn the Adaptive Numerator, the following must happen

  1. Open Throttle.
  2. Engine Cool Temp Above 100°F Or If Below 100°F, Wait For ECT Rise Of 59°F.
  3. More than 10" Vacuum.
  4. Above 1200 RPM.
  5. Below 3000 RPM - A/T.
  6. Below 3488 RPM - M/T.

Once the PCM has learned the Adaptive Numerator, the Misfire Monitor will run.

Fuel System monitor is continuously running during engine operation.

OBD-II Monitor Enabling Criteria FWD/AWD SBEC PCM Equipped Vehicles

The following procedure has been established to assist technicians in the field with enabling and running OBD-II Monitors on FWD cars and FWD/AWD vans equipped with Single Board Engine Controller (SBEC). The order listed in the following procedure is intended to allow the technician to effectively complete each monitor and to set the CARB Readiness Status in the least time possible.

Note. Once the monitor run process has begun, DO NOT turn off the ignition. By turning the ignition key off, the monitor enabling conditions will be lost. Only the O2 Heater Monitor runs after key off.

Note. By performing a battery disconnect, or erasing diagnostic trouble codes, the CARB Readiness and all additional OBD information will be cleared.

The following is an outline of the Monitoring Run Process, including suggestions and tips in order to aid in the process of meeting the enabling criteria for these monitors. The most efficient order has been outlined below, the first two monitors have very similar enable criteria, so it is possible that the Evaporative Leak Detection Monitor will run while operating the vehicle to enable the Catalyst Monitor.

Evaporative Leak Detection Monitor (If Equipped)

This monitor requires a cold start, usually an overnight soak or parked for at least 8 hours without the engine running. The engine coolant temperature must be within 10 degrees of ambient/battery temperature, and the sensed Ambient (outside) temperature must be between approximately 40°F and 90°F.

The vehicle will need to be driven at a steady highway speed for a few minutes. The monitor will typically enable and start running around 45 to 60 mph under normal driving conditions. If the vehicle is equipped with a manual transmission, using 4th gear may assist in meeting the monitor running criteria.

The EGR monitor enable conditions are basically that the vehicle is in closed loop operation and coolant temperature above 170°F. It is necessary to maintain the TPS, MAP, MPH and RPM ranges at a constant with very little fluctuation to allow the monitor to complete during the cycle.

The vehicle will need to be driven for a period of time at highway speeds and brought to a complete stop for a short period of time, with the A/T left in Drive the monitor should run. The O2 Monitor will not run in Park or Neutral on A/T equipped vehicles.

The Purge Free cells must be updated before the monitor will run. The enabling conditions are similar to the O2 Sensor Monitor enabling conditions such as, the vehicle will need to be driven for a period of time at highway speeds and brought to a complete stop. The Purge Flow Monitor will attempt to run every OTHER throttle closure. If all of the parameters are met and it still does not run, with your foot firmly on the Brake, quickly open and close the throttle, this will allow another Purge Free update, and then the Purge Flow Monitor should run.

The vehicle will need to be driven for a period of time at highway speeds to satisfy the enabling conditions for the O2 Sensor Heater Monitor. The monitor runs with the ignition key off after vehicle operation. Allow the vehicle to hot soak for a few minutes before checking to determine if the monitor completed the cycle. Turning the key on prematurely will abort the monitor test and the vehicle will have to be driven to arm the enabling conditions again.

Misfire monitor is continuously running during engine operation. For the Misfire monitor to be enabled, the Adaptive Numerator must be learned since battery disconnect and every Key on there after (known as Power-on learning).

The Adaptive Numerator is a software learning routine that tells the PCM where the crankshaft slots are. Since every crankshaft is different, the PCM must learn exactly where its particular crankshaft slots are; otherwise its RPM calculations would be wrong. After a battery disconnect and then a power-up of the PCM, the Adaptive Numerator is set to a value which it would be at if everything were perfect (crankshaft slots, sensors, PCM hardware, etc.). If the Adaptive Numerator is equal to the default value, no learning has happened and the Misfire Monitor will not run.

To allow the PCM to learn the Adaptive Numerator, the following must happen

  1. Open Throttle.
  2. Engine Cool Temp Above 100°F, Or If Below 100°F Wait for ECT Rise of 59°F.
  3. More Than 10" Vacuum.
  4. Above 1200 RPM.
  5. Below 3000 RPM - A/T.
  6. Below 3488 RPM - M/T.

Once the PCM has learned the Adaptive Numerator, the Misfire Monitor will run.

Fuel System monitor is continuously running during engine operation.

Information is not available from the manufacturer.

OBD-II MONITOR RUN PROCESS

The following procedure has been established to assist technicians in the field with enabling and running OBD II Monitors. The order listed in the following procedure is intended to allow the technician to effectively complete each monitor and to set the CARB Readiness Status in the least time possible.

Note. Once the monitor run process has begun, do not turn off the ignition. By turning the ignition key off, monitor enabling conditions will be lost. EVAP Monitor runs after key off. By performing a Battery Disconnect, or Selecting Erase DTCs, the CARB Readiness and all additional OBD II information will be cleared.

Monitor Preliminary Checks

  1. Plug a scan tool into the vehicle's Data Link Connector (DLC).
  2. Turn the ignition, KEY ON - ENGINE OFF. Watch for MIL lamp illumination during the bulb check. MIL lamp must have illuminated, if not, repair MIL lamp.
  3. Using a scan tool check for Powertrain related DTCs. Verify that No Emissions Related DTCs are Present. If an Emissions DTC is Present, the OBD II Monitors may not run and the CARB Readiness will not update. The Emissions related DTC, will need to be repaired, then cleared. By clearing DTCs, the OBD Monitors will need to be run and completed to set the CARB Readiness Status.

Using the scan tool check the CARB Readiness Status.

Do all the CARB Readiness Status Locations read YES?

  1. YES - all monitors have been completed and this vehicle is ready to be I/M or Emission Tested.
  2. NO - then the following procedure needs to be followed to run/complete all available monitors.

Note. Only the monitors, which are not YES in the CARB Readiness Status, need to be completed. Specific criteria need to be met for each monitor. The most efficient order to run the monitors has been outlined below, including suggestions to aid the process.

Evaporative Emission System Leak Detection with Purge Monitor

This monitor requires a cool down cycle, usually an overnight soak for at least 8 hours without the engine running. The ambient temperature must decrease overnight - parking the vehicle outside is advised. To run this test the fuel level must be between 15-85% full. Criteria for EVAP monitor

  1. Engine off time greater than one hour.
  2. Fuel Level between 15% and 85%.
  3. Start Up ECT and IAT within 10°C (18°F).
  4. Vehicle started and run until Purge Monitor reports a result.

Note. If the vehicle does not report a result and the conditions where correct. It may take up to two weeks to fail the small leak monitor. DO NOT use this test to attempt to determine a fault. Use the appropriate service information procedure for finding a small leak. If there are no faults and the conditions are correct this test will run and report a pass. Note the Small leak test can find leaks less than 10 thousands of an inch. If a small leak is present it takes approximately one week of normal driving to report a failure.

Catalyst/O2 Monitor

The Catalyst and O2 Monitor information are acquired and processed at the same time. Most vehicles will need to be driven at highway speed (less than 50 mph) (73 km/h) for a few minutes. Some vehicles run the monitor at idle in drive. If the vehicle is equipped with a manual transmission, using 4th gear may assist in meeting the monitor running criteria.

  1. Engine RPM between 1200 to 3000.
  2. Engine temperature greater than 70°C (158°F)
  3. Engine run time greater than 92 seconds
  4. MAP between 10 - 20 kPa (7.5 - 15 Hg)
  5. Vehicle speed between 20 - 70 mph (29-103 km/h)

After the vehicle has reached the below conditions and during a throttle decel the EGR monitor will run.

  1. Engine RPM between 1375 - 2500
  2. Engine temperature greater than 70°C (158°F)
  3. Engine run time greater than 125 seconds
  4. Vehicle speed between 25 - 70 mph (37-103 km/h)

This monitor is now continuously running once the heaters are energized. Pass information will be processed at power down.

Mis-Fire Monitor

The Misfire Monitor is a continuous two-trip monitor. The monitor uses two different tests/counters

Note. The Adaptive Numerator must be learned before the PCM will run the Mis-Fire Monitor. The PCM updates the Adaptive Numerator at every key-ON, and is relearned after battery disconnect. The Misfire Monitor will not run until the Adaptive Numerator has updated since the last battery disconnect. If the Adaptive Numerator is equal to the default value then the PCM knows that the Adaptive Numerator has not been learned and does not permit the Misfire Monitor to run. If the Adaptive Numerator exceeds a calibrated percentage, the PCM sets a DTC for CKP NOT LEARNED and illuminates the MIL.

  1. 200 Revolution Counter - Looks for misfire that can cause immediate catalyst damage.
  2. 1000 Revolution Counter - Looks for misfire that can cause emissions to increase 1.5 times the Federal Test Procedure (FTP) standards. This test must also identify misfire percentages that might cause a "durability demonstration vehicle" to fail an Inspection and Maintenance Program tailpipe emissions test.