With Manufacturer's Scan Tool
The content of this article/image reflects the changes called out by TSB - 02-13-020CAUTION
(1) When battery voltage is low, no detection of failure is possible. Be sure to check the battery for voltage and other conditions before starting the test.
(2) Diagnostic item is erased if the battery or the engine control module connector is disconnected. Do not disconnect the battery before the diagnostic result is completely read.
(3) Be sure to connect or disconnect the scan tool with the ignition switch turned off. If the scan tool is disconnected with the ignition switch placed in the ON position, ABS diagnostic trouble code may be stored and ABS warning lamp turned on.
READINESS TEST STATUS
As for the major diagnostic items listed below, the ECM stores in its memory whether or not they have ever completed the respective drive cycle tests successfully.
The stored data can be read out by means of a scan tool. (In case of an MUT-II, the message "Complete" is displayed if an item has undergone its particular drive cycle test.)
This data will all be cleared if the battery terminal is disconnected or DTC erasion is carried out.
In order to complete the readiness test status that has been reset, the vehicle must be operated twice on the OBD-II Drive Cycle to comply with all the following diagnosis items (except P0442 and P0455).
Note: After the first operation of the vehicle has benn performed on the OBD-II Drive Cycle for all the diagnosis items, the ECM completes the readiness test ststus, beginning with an item (regardless of whether it is normal or faulty) which the ECM has monitored at the time of the second operation of the vehicle on the OBD-II Drive Cycle.
In addition, after all readiness test status are complete, a DTC should be interrogated. If a DTC is stored, perform repair by referring to the relevant DTC procedures. Then complete the readiness test status by repeating the "OBD-II Drive Cycle. If a DTC is not stored, no further action will be needed.
- Catalyst: P0421, P0431
- Evaporative system: P0442, P0455
- Heated oxygen sensor: P0130, P0136, P0150, P0156
- Heated oxygen sensor heater: P0135, P0141, P0155, P0161
- EGR system: P0400
WHEN USING THE SCAN TOOL MUT-II
(1) Connect the scan tool to the data link connector.
(2) Turn the ignition switch to ON.
(3) Take a reading of the diagnostic output.
(4) Repair the problem location, referring to the diagnostic chart.
(5) After turning the ignition switch once to OFF, turn it back to ON.
(6) Erase the diagnostic trouble code.
(7) Read the diagnostic trouble codes. Check that the scan tool displays "normal".
PROVISIONAL DTCs [MUT-II OBD-II Test Mode - Results (Mode 5)]
MUT-II will display the Provisional DTCs reported by ECM if the ECM detects some malfunction for "Misfire", "Fuel System" and "Comprehensive" monitoring during a SINGLE Driving Cycle. The intended use of this data is to assist the technician after a vehicle repair and after clearing diagnostic information, by reporting test result after a SINGLE Driving Cycle.
Note that the test results reported by this mode do not necessarily indicate a faulty component(system. If test results indicate a failure after ADDITIONAL (consecutive) driving, then the MIL will be illuminated and a DTC will set.
DIAGNOSIS BY DIAGNOSTIC TEST MODE II (INCREASED SENSITIVITY)
When mode II is selected with MUT-II, the Check Engine/Malfunction Indicator Lamp will light when the ECM first detects the trouble. (Note that this is only for engine related trouble.) At the same time, the relevant diagnostic trouble codes will be registered.
In respect to the comprehensive component electrical faults (open/shorts), the time for the DTC to be registered after the fault occurrence is shortened (4 sec. -> 1 sec.)
With this, the confirmation of the trouble symptom and the confirmation after completing repairs can be reduced.
However, to return to the normal mode I after mode II has been selected once, the ignition switch must be turned OFF once or mode I must be reselected with the MUT-II. The DTC, readiness test status and freeze frame data, etc., will be erased when mode I is returned to, so record these if necessary.
(1) Using the scan tool, changeover the diagnostic test mode of the engine control module to DIAGNOSTIC TEST MODE II. (INCREASED SENSITIVITY)
(2) Road test the vehicle.
(3) Read the diagnostic trouble code in the same manner as "READ OUT OF DIAGNOSTIC TROUBLE CODE" and repair the malfunctioning part.
(4) Turn off the ignition switch will cause the engine control module to changeover the ECM from the diagnostic test mode II to the diagnostic test mode I.
NOTE: Turning OFF the ignition switch will cause the engine control module to changeover the ECM from the diagnostic test mode II to diagnostic test mode I.