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Home >> Mitsubishi >> 1999 >> Eclipse GS L4-1997cc 2.0L DOHC MFI >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Testing and Inspection >> Monitors, Trips, Drive Cycles and Readiness Codes >> Readiness Test Status

Readiness Test Status

IMPORTANT: The Readiness Test requires a short vehicle test drive Be sure that the vehicle is driveable and that all test tools and equipment except the scan tool have been removed.

If the vehicle passes the Readiness Test, this indicates that the condition which caused the DTC to set is not present at this time
1. Clear all DTCs from the PCM memory
2. Be sure the scan tool and adapter harness MB991545 are still connected to the vehicle.
3. Start the engine under the following vehicle conditions required to run the EVAP Leak Detection Test
- Cold start
- "Battery" temperature (obtained from a temperature sensor inside the PCM) between 4°C (40°F) and 31°C (89°F)
- Engine coolant temperature within ± 56°C (10°F) of "battery" temperature
- Battery voltage 10 - 15 volts

NOTE: If battery voltage drops below 10 volts during engine cranking, the EVAP Leak Detection Test will not run.

- Low fuel warning light off - On scan tool data list "LOW FUEL LEVEL SN 78" reading is below 2000 mV
- MAP sensor reading 75 kPa (11 psi)
- No engine stall during test
- The following DTCs must not be set
- DTC 18 - Purge solenoid electrical fault
- DTC 02 - PCM self-test faults
- DTC 01 - Cam sensor faults
- DTC 40 - Crank sensor faults
- DTC 132, DTC 26- TPS faults
- DTC 30, DTC 31 - Coolant sensor faults
- DTC 36, DTC 37, DTC 39, DTC 135 - MAP sensor faults
- DTC 71, DTC 153, DTC 154 - Battery temperature sensor electrical faults

NOTE: If the engine coolant temperature (ECT) or battery temperature readings on the scan tool do not meet the EVAP Leak Detection Test requirements, refer to the "Readiness Test Tips".




3. Within 40 seconds of engine start-up, place your hand on the LDP (located on the front passenger side) You should feel a light cycling tapping as the LDP activates.
a. If LDP is not activated, check for DTCs If no DTCs are set, confirm that all required monitor conditions are met If so, disconnect the PCM connector A-107 for about two minutes, then reconnect.
b. If LDP is activated, go to Step 4.




4. Observe the Readiness Test status by following the scan tool selection sequence shown in the illustration.




5. To complete the readiness Test, the PCM must sufficiently purge the EVAP system Drive the vehicle between 56 - 72 kph (35 - 45 mph) on a level surface at a steady throttle (this can include slowing or stopping, it will take ten minutes or less to complete the readiness Test) The Readiness Test is completed when "EVAP CMP" is displayed on the scan tool screen

NOTE: If the Readiness Test does not complete, or the vehicle conditions do not meet EVAP Leak Detection Test requirements, refer to the "Readiness Test Tips".

- If all of the conditions for running the EVAP Leak Detection Test (see "Enabling Conditions to Run EVAP Leak Detection Test") are not met, the tests will not run and could lead to misdiagnosis.
- If the "battery temperature" value displayed on the scan tool is too high, you can blow cool air on the PCM with a fan to cool the PCM sensor that estimates battery temperature If "battery temperature" is too low, try warming the PCM by blowing warm air on it However, do no expose the PCM to extreme temperatures or the PCM could be damaged.

- If the Readiness Test does not complete or if you want to quickly determine if a fault condition is still present, you can perform a quick check of the EVAP system as follows The readiness test will not complete, because purge will not take place, but you will be able to see if the PCM detects any problems that could set DTC 184, 187, 160 , or 161.
Connect a test light, logic probe, or voltmeter between the LDP solenoid control terminal (E-62 terminal 3) and B+ by backprobing into the connector with the harness connected to the LDP.
When the PCM energizes the LDP solenoid, you will hear a click from the LDP and your tester will indicate that the solenoid is turned on (You can also touch the LDP and feel the solenoid clicking Refer to the EVAP Leak Detection Test Sequence chart.
Compare the LDP solenoid activity with the monitor sequence in the chart As each section of the test runs, this indicates that the previous section passed successfully By watching to see which tests complete, you can see if any conditions are present that the PCM considers abnormal


- When performing the above quick check procedure, if the engine coolant temperature (ECT) reading on the scan tool is not within ± 5.6°C (10°F) of "battery temperature" reading, it may be necessary for the vehicle to sit several hours to cool sufficiently Or you can save time by substituting an inexpensive resistor for the ECT sensor to bring the reading into the required range This will also allow you to run the test repeatedly (if necessary) since the resistor provides a consistent ECT reading within the required temperature range.
Insert a resistor as follows to change the coolant temperature reading to meet required monitor conditions.
a. Turn the ignition switch to OFF
b. Disconnect the coolant temperature sensor
c. Note the battery temperature reading on the scan tool
d. The chart below lists three resistor values that will cover the temperature range for the EVAP leak detection test to run Select a resistor value that will bring the ECT reading to within ± 5.6°C (10°F) of the battery temperature reading.





CAUTION: To prevent damaging the connector, use only a 1/2 watt resistor (Radio Shack or equivalent) which has the correct lead diameter to properly fit into the connector terminals.




e. Bend the resistor leads so they are parallel and spaced the same distance apart as the coolant temperature sensor terminal pins.
f. Insert the resistor leads into the ECT harness connector in place of the ECT.
g. Turn the A/C on at maximum setting so that the cooling fan will come on when the engine is running If the vehicle is not equipped with A/C, use a jumper wire between the cooling fan and B+ to activate the fan.
h. Turn the ignition switch to ON and confirm that the engine coolant temperature (ECT) reading on the scan tool is within ±5.6°C (10°F) of "battery temperature" reading.
i. Clear any DTCs from PCM memory that may have set Then continue with the Readiness Test procedure.
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