you dont have any power issues going to the PCM?
If it looses key off retained power it will lose the readiness test/monitors as well.
Was it this TSB?
TECHNICAL SERVICE BULLETIN
Reference Number(s): TSB-03-13-005, Date of Issue: May 2003
MITSUBISHI:1996-98 Diamante, Eclipse, Expo/Expo LRV, Galant, Mirage, Montero, Montero Sport, Truck, 3000GT
Superceded Bulletin(s): TSB-00-13-005
Related Ref Number(s): TSB-00-13-005, TSB-03-13-005
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 OBD Clearinghouse
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 off, or the technician can complete all but the catalyst monitor before returning the vehicle to the customer for I/M testing.
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 OBD-II DRIVE CYCLE for reprogramming to retain OBD-II Readiness Codes on 420A models.)
Questions regarding OBD-II Readiness codes and drive cycles should be directed to Tech Line.
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 Fig. 3 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").
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.
Turn the ignition on, and observe the Readiness Test status on the scan tool by following the scan tool selection sequence below: Fig. 1
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.)
IMPORTANT:Refer to the chart in Fig. 3 to identify the type of evaporative emission control monitor used on the vehicle. Use the appropriate evaporative emission control monitor (Strict Evap or Purge Flow).
Evaporative Emission Control Monitor
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.
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.
TPS approximately 0.5 (idle switch is ON)
Engine coolant temperature greater than 170 degrees F
Oxygen Sensor Monitor:
Start the engine and allow to idle until the coolant temperature reaches at least 82 degrees C (180 degrees F).
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 follows:
ENGINE SPEED (EXCEPT 3000GT)
Galant, Eclipse, Expo, Truck1100 - 3000 rpm1500-3000 rpm
Mirage 1.5L1400-3200 rpm1600-3000 rpm
Mirage 1.8L1400-3000 rpm1600-3000 rpm
Diamante, Montero, Montero Sport1100-3000 rpm1250-3000 rpm
Be sure the engine coolant temperature is at least 82 degrees C (180 degrees F).
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.
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)
Repeat Steps b. and c. It may be necessary to repeat this procedure up to 8 times during the first drive cycle only.
To pre-condition the vehicle for the catalyst monitor, drive at 60 mph as follows:
Mirage 1.5L Only
Accelerate to 60 mph for 30 seconds. Engine speed must be at least 2000 rpm and MAP sensor reading must be 323 mmHg or more (M/T); 341 mm Hg or more (A/T). Then drive at 60 mph for 60 seconds. During the 60 seconds, the engine speed must be at least 2000 rpm and MAP sensor reading must be 10.5 inHg or more (M/T); 10.8 inHg or more (A/T). Then go to Step b .
Drive at 60 mph for 70 seconds. The volume air flow sensor reading must be more than 100 Hz during the 70 seconds. Then go to Step b .
All other models
Drive at 60 mph for 10 seconds. The volume air flow sensor reading must be more than 200 Hz (more than 280 Hz for Truck).
Then continue to drive at 60 mph for 50 seconds. The volume air flow sensor reading must be more than 100 Hz (more than 160 Hz for Truck). Then go to Step b. .
NOTE:If necessary, you can stop the vehicle after pre-conditioning before continuing with Step b. below. But do not turn off the engine.
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:
ENGINE SPEED PARAMETERS
ModelEngine Speed (rpm)
Galant, Eclipse, Expo, Mirage, Truck2600 or less
Mirage 1.5L3000 or less (M/T); 2250 or less (A/T)
3000GT, Diamante, Montero, Montero Sport, Mirage 1.8L3000 or less
Volume air flow sensor reading must be within the range listed:
VOLUME AIR FLOW SENSOR (Hz)
ModelVolume Air Flow Sensor (Hz)
Galant, Eclipse, Expo, Mirage70 - 140
Truck90 - 210
3000GT, Diamante, Montero, Montero Sport70 - 170
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 b .
Release the accelerator pedal to reduce speed for 10 seconds.
Repeat Steps b. and c. . It may be necessary to repeat this procedure up to 6 times during the first drive cycle only.
Check the Readiness Test status on the scan tool.
When all Readiness codes are complete ("CMP"), the OBD-II system check is completed.
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.
If one or more (not all) Readiness codes are complete ("CMP"), go to Step 2 to identify which monitor did not complete.