Readiness Test
READINESS TESTIMPORTANT:
The Readiness Test requires a vehicle test drive. Be sure that the vehicle is driveable and that all test tools and equipment except the MUT-II 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 or has been successfully repaired.
1. Connect the MUT-II and adapter harness MB991545 to the vehicle.
2. Check for any DTCs. If any are present, clear all DTCs from the PCM memory.
3. Before the vehicle can complete the Readiness Test, the PCM fuel adaptive memory must be updated by driving the vehicle for approximately 10 miles. The drive must include the following distances and speeds, but they can be driven in any order and can be "broken up." The drive can include stops and slow turns as needed.
a. Drive at least three miles at 25 mph.
b. Drive at least two miles at 35 mph.
c. Drive at least three miles at 45 mph.
For example, you could drive 1/2 mile at 25 mph, then one mile at 35 mph, then one mile at 45 mph, then 3/4 mile at 45 mph, and so on, until the required distances and speeds are completed, and a total of ten miles are driven.
4. Park the vehicle overnight ("cold soak"). THE NEXT MORNING, DO NOT TURN ON THE IGNITION KEY UNTIL YOU ARE READY TO COMPLETE THE READINESS TEST.
! WARNING
Be sure the vehicle is parked in a safe, open area in preparation for the Readiness Test the next day.
IMPORTANT:
Do not turn the ignition key to "ON" unless you are ready to complete the Readiness Test. If the key is turned on before the last part of the Readiness Test, the drive cycle and overnight cold soak must be repeated.
5. Turn the ignition key ON and verify with the MUT-II that the following vehicle conditions required to run the EVAP Leak Detection Test are met:
^ "Battery" temperature (obtained from a temperature sensor inside the PCM) between 4°C (40°F) and 31 °C (89° F). On MUT-II data list, "BATTERY TEMP 45,".
NOTE:
If the "battery temperature" value displayed on the MUT-II 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 not expose the PCM to extreme temperatures or the PCM could be damaged.
^ Engine coolant temperature within +/- 5.6°C (10°F) of "battery" temperature. On MUT-II data list, "ENG CLNT TEMP 05".
^ Battery voltage 10-15 volts
^ Low fuel warning light off. On MUT-II data list "LOW FUEL LEVEL SN 78" reading is below 2000 mV
^ MAP sensor reading 22 inHg or above. (This is the manifold absolute pressure, not vacuum.) On MUT-II data list "MAP SENSOR 11"
NOTE:
The engine must not stall during the test, or the EVAP Leak Detection Test will not run. Also, if battery voltage momentarily drops below 10 volts during engine cranking, the EVAP Leak Detection Test will not run.
^ 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
6. Start the engine and allow the vehicle to idle until it reaches at least 180°F.
! WARNING
Be sure the vehicle is parked in a safe, open area before continuing with Step 7.
7. Set the parking brake. Press the brake pedal, place the transmission in Drive (A/T) or in Neutral (M/T and "blip" the throttle open (momentarily press on the accelerator pedal). Allow the engine to return to normal idle rpm.
8. Observe the Readiness Test status by following the MUT-II selection sequence.
The Readiness Test is completed when "EVAP:CMP" is displayed on the MUT-II screen.