Emissions - OBDII Readiness Code Information
No.: TSB-03-13-005DATE: May, 2003
MODEL: 1996-98 models
SUBJECT:
OBD-II DRIVE CYCLE
This bulletin supercedes TSB-00-13-005, to update the OBD-II drive cycle procedures. New information is indicated by --> and black filled triangles.
PURPOSE
--> Since January 2001, the U.S. Environmental Protection Agency (EPA) requires that vehicles must have all OBD-II Readiness Codes "complete" at the time of an I/M test ("smog check"). States with I/M programs are not required to use OBD-II inspection, and can use tailpipe inspections, but EPA encourages using OBD-II. Some states have less stringent air quality requirements or localized programs. Many states already have OBD-II I/M programs in place, and more are added every year. Refer to the web site www.obdclearinghouse.com to identify states that currently have an OBD-II I/M program in place.
During the OBD-II drive cycle, the OBD-II system checks each emission control system by monitoring it for proper operation. It is necessary to run the OBD-II drive cycle:
^ To confirm that a fuel-related or emission-related diagnostic trouble code (DTC) repair was successful.
^ If the vehicle's I/M test results indicate that the OBD-II Readiness Monitors are "incomplete."
--> Instructions in this bulletin describe how to drive the vehicle to complete the oxygen sensor monitor, EGR monitor, catalyst monitor, Evaporative Emission Control purge flow monitor, and Evaporative Emission Control (Strict) System Leak (EVAP) monitor. All of these monitors except the Strict Evap must be completed on the first drive cycle. After that, when each monitor is completed on the next drive cycle, the scan tool Readiness Test screen will display the monitor as complete ("CMP").
--> If none of the OBD-II monitors show "Complete," the technician may want to choose "Increased Sensitivity" mode on the scan tool and follow the drive cycles for completing Readiness. This will help to confirm that all monitors will run and "Complete" during one drive cycle. The "Increased Sensitivity" mode is for testing purposes only, and will erase all Readiness when exiting from this mode or turning the ignition to OFF.
This bulletin contains:
^ OBD-II drive cycle procedures for 1996-98 affected vehicles only (Refer to the appropriate service manual for 1998 and later model OBD-II drive cycle procedures.)
^ Warranty claim information for OBD-II drive cycle on all affected vehicles.
NOTE:
On 1996-97 V6 models. after all Readiness codes are complete, turning the ignition off will cause all the Readiness status readings to show incomplete ("INCMP"). This may require that an I/M test be performed before the ignition key is turned oft, or the technician can complete all but the catalyst monitor before returning the vehicle to the customer for I/M testing.
AFFECTED VEHICLES
--> 1996-1998 Montero, Montero Sport, Diamante, Truck, 3000GT, Mirage, Galant, Expo/Expo LRV, and Eclipse models (except 2.0L non-turbo 420A engine models)
(Refer to TSB-03-13-006 for reprogramming to retain OBD-II Readiness Codes on 420A models.)
PROCEDURE (1996-1998 AFFECTED VEHICLES ONLY)
For 1998 and later models, refer to Group 13 in the appropriate service manual, under "OBD-II Drive Cycle."
CAUTION
This procedure requires two people in the vehicle during the drive cycle. One person must drive within the drive cycle parameters while the other person reads the scan tool (MUT-II or MUT-III).
IMPORTANT:
In order to carry out the OBD-II drive cycle, the ambient temperature must be higher than -10 degrees C (14 degrees F), and all electrical components must be turned off.
--> The following instructions describe how to drive the vehicle to complete the oxygen sensor monitor, EGR monitor, catalyst monitor, Evaporative Emission Control purge flow monitor, and Evaporative Emission Control (Strict) System Leak (EVAP) monitor. All of these monitors except the Strict Evap must be completed on the first drive cycle. After that, when each monitor is completed on the next drive cycle, the scan tool Readiness Test screen will display the monitor as complete ("CMP").
Refer to the chart to determine the vehicle's type of evaporative emission control monitor.
^ On vehicles with purge flow evaporative emission control monitor, the purge flow monitor must be completed first during the first and second drive cycles.
^ On vehicles with strict evaporative emission control monitor, the strict evap monitor should be completed first after the first drive cycle is completed because it requires a cold start.
^ If all of these monitors (Readiness Tests) are incomplete ("INCMP") on the scan tool status screen before you begin the drive cycle, the scan tool will not indicate any change in their status during the first drive cycle.
^ If any of the monitors are already complete, then all of the monitors have been completed at least once. Before you begin the drive cycle, check the scan tool Readiness Test status screen frequently while driving. Watch for the status to change to complete ("CMP").
1. With the ignition switch off, connect the scan tool. Check for any DTCs. If any are present, note the DTC(s), then clear all DTCs from the PCM memory.
2. Turn the ignition on, and observe the Readiness Test status on the scan tool by following the scan tool selection sequence shown.
The Readiness Test status is displayed on the scan tool.
Perform those Readiness Tests (Monitors) which are incomplete ("INCMP").
NOTE:
On the first drive cycle, perform all monitor drive cycles within the same key cycle. (Do not turn the engine off and back on between drive cycles.)
3. Evaporative Emission Control Monitor
a. Strict Evap Leak Monitor
This monitor must be completed after the first drive cycle is completed. and within 16 minutes after initial engine start-up. This monitor is controlled by a timer in the PCM, which enables the monitor to run for only 16 minutes.
The following conditions must be met for this monitor:
^ Engine coolant temperature 30 degrees C (86 degrees F) or less (COLD START
^ Ambient temperature 5-30 degrees C (41-86 degrees F)
^ A/T select lever in D range, with Overdrive switch ON
^ Fuel tank 30-50% full is recommended
After initial start-up, immediately begin driving on level ground (no hills) at approximately 55 mph. Do not rapidly accelerate or decelerate. Do not turn corners or change lanes. If fuel sloshing occurs, this monitor must be restarted.
b. Purge Flow Monitor
--> If this procedure is started just after the other monitors are completed, stop the vehicle and allow to idle for 5 minutes at the conditions listed below.
--> If this procedure is started with the ignition key turned to OFF, start the engine and wait for the coolant temperature to reach over 180 degrees F. Then drive the vehicle at more than 20 mph for 120 seconds. Then stop the vehicle and allow to idle for 5 minutes at the conditions listed below.
--> Vehicle conditions must be:
^ Shift lever in Park or Neutral
^ No electrical load (A/C, fan and all accessories are off.) Do not apply brake pedal.
^ Steering wheel is at center.
--> Scan tool readings must be:
^ IAC valve position stable between 10 and 30 steps.
^ Closed loop
^ TPS approximately 0.5 (idle switch is ON)
^ Engine coolant temperature greater than 170 degrees F
4. Oxygen Sensor Monitor:
a. Start the engine and allow to idle until the coolant temperature reaches at least 82 degrees C (180 degrees F).
b. Drive at 40 mph for two minutes. Engine load must be 25-60% (except 22%-60% on Mirage 1.8L M/T models). On Mirage 1.5L models, MAP sensor reading must be 7.8-19.8 inHg.
Engine speed must be as shown.
5. EGR Monitor:
a. Be sure the engine coolant temperature is at least 82 degrees C (180 degrees F).
b. Drive at 40 mph, at engine speeds between 2400-2600 rpm, for 20 seconds. On A/T models, it may be necessary to set the overdrive to OFF
c. Release the accelerator pedal and reduce speed to 20 mph. The following conditions must be met for 5 seconds:
^ Idle switch: ON
^ Engine speed 2000 rpm or less, except 1700 rpm or less for Mirage 1.8L
^ Engine load: 15% or less (M/T); 20% or less (A/T - Galant, Expo, Eclipse, Mirage, Truck
^ Engine load: 18% or less (M/T); 28% or less (A/T) - 3000GT, Diamante, Montero, and Montero Sport
^ For Mirage 1.5L only: MAP sensor reading 10.2 inHg or less (M/T); 13.7 inHg or less (A/T)
d. Repeat Steps 5b. and 5c. It may be necessary to repeat this procedure up to 8 times during the first drive cycle only.
6. Catalyst Monitor:
a. To pre-condition the vehicle for the catalyst monitor, drive at 60 mph as shown.
--> NOTE:
If necessary, you can stop the vehicle after pre-conditioning before continuing with Step b. below. But do not turn off the engine.
--> b. Find a road where you can drive at a constant speed with no stops for two minutes. Reduce speed to meet the following conditions for two minutes. The following conditions must be met and held within the parameters below and verified on the scan tool data list during the two minutes:
^ Idle switch: OFF shown on scan tool data list
^ Engine speed must be at or below the speed listed:
^ Volume air flow sensor reading must be within the range listed:
^ MAP sensor reading for Mirage 1.5L M/T models must be 5.8 - 18.7 inHg
^ MAP sensor reading for Mirage 1 . 5L A/T models must be 7 - 21.6 inHg
If the volume air flow sensor reading or engine speed goes out of the specified range during this monitor, you must repeat this monitor from Step 6b.
c. Release the accelerator pedal to reduce speed for 10 seconds.
d. Repeat Steps 6b. and 6c. It may be necessary to repeat this procedure up to 6 times during the first drive cycle only.
7. Check the Readiness Test status on the scan tool.
a. When all Readiness codes are complete ("CMP"), the OBD-II system check is completed.
b. If all the Readiness codes are incomplete ("INCMP"), turn the ignition key to "OFF" and wait for 10 seconds. Then go to Step 3 to carry out the entire OBD-II drive cycle (all monitors) again.
c. If one or more (not all) Readiness codes are complete ("CMP"), go to Step 2 to identify which monitor did not complete.
WARRANTY INFORMATION