Tools - Enhanced Diagnostic Testing & Feature Software
NO.: TSB-97-00-002DATE: March, 1997
MODEL: All Models
SUBJECT:
NEW MUT-II ROM PACK FEATURES
The new 8M bit ROM pack for the MUT-II scan tool was shipped to MMSA Dealers in December, 1996. The new ROM pack, Special Tool MB991710, is identified by the "MRP-N (8M)" label on its side.
In addition to the information contained in the previous (2M) ROM pack version, the new ROM pack contains 1997 Montero Sport diagnostic information. It also has several new features:
^ U.S./Metric Conversion
^ Enhancements for OBD-II (heated oxygen sensor testing and provisional DTCs)
^ Dual Communication Method
^ HELP Function
Item name sort, main menu flow, and ECM item name displays are also modified by the new ROM pack.
AFFECTED VEHICLES
All models
NEW FEATURES
U.S./METRIC UNIT CONVERSION
By selecting the "System Set Up" mode from the main menu, you can choose either U.S. or metric units of measurement.
When using a MUT-II scan tool equipped with the IC memory card, the selected unit of measure will remain until a different selection is made.
The flowchart in this bulletin shows the MUT-II selection sequence for selecting the unit of measurement.
ENHANCEMENTS FOR OBD-II TESTING
1. Heated Oxygen Sensor (HO2S) Test Result (Mode 5) (SAE J1979 Test Mode $05)
This feature applies only to Mitsubishi engines on 1997-on models. It does not apply to Chrysler-manufactured engines.
The MUT-II will display the ECM HO2S Test Result. The purpose of this mode is to allow access to the on-board oxygen sensor monitoring test results. The ECM modulates A/F (Air Fuel Ratio) from lean to rich and measures a switching time of oxygen sensor (Bank 1 or 2, Sensor 1) output. If the time is over the predetermined value, the ECM judges a problem with the oxygen sensor.
When the following P-Codes display, you can determine whether the malfunction is a sensor, an open or short circuit, or a deterioration.
P0130 : HO2S Circuit Malfunction (Bank 1, Sensor 1)
P0150 : HO2S Circuit Malfunction (Bank 2, Sensor 1 for V6 Engine)
The following items display:
No. 01: Rich to Lean Sensor Threshold Voltage (Bank 1 & 2, Sensor 1 & 2)
No. 02: Lean to Rich Sensor Threshold Voltage (Bank 1 & 2, Sensor 1 & 2)
No. 04: High Sensor Voltage for switch time calculation (Bank 1 & 2, Sensor 1)
No. 06: Lean to Rich Sensor switch time (Bank 1 & 2, Sensor 1)
Items No. 01, 02, and 04 are fixed values in the ECM ROM. Item No. 06 is the test result. If this value is over the predetermined value, the technician knows that a problem has occurred. If this value is within the predetermined value, the malfunction is a open or short circuit. Items No. 04 and 06 are not available for H02S Sensor 2 because the ECM does not use HO2S Sensor 2 to detect its deterioration.
If the HO2S Test is not completed, the switch time indicates "0 sec." This does not necessarily mean there is a problem. Verity by checking completion of the HO2S test. The oxygen sensor is deteriorated if the "Lean to Rich Sensor Switch Time" is over the predetermined value. The predetermined value is specified in Group 13A of the service manual in the Diagnosis section for DTC P0130 under "Judgement Criteria." If the "Lean to Rich Sensor Switch Time" is under the predetermined value (including "0 sec."), oxygen sensor deterioration is not detected.
IMPORTANT:
If the MIL is illuminated and the MUT-II displays the above P-codes, do not erase the P-codes before checking the HO2S Test Result. If the P-codes are erased, the test result is also erased from the ECM memory.
The MUT-II selection sequence for obtaining HO25 test results is shown on the flowcharts.
2. Provisional DTCs (SAE J1979 Test Mode $07)
This feature applies only to Mitsubishi engines on 1997-on models. It does not apply to Chrysler-manufactured engines.
This purpose 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. The MUT-II will display the Provisional DTCs reported by the ECM if the ECM detects any malfunction for "Misfire", "Fuel System" and "Comprehensive" monitoring during a single driving cycle.
The test results reported by this mode do not necessarily indicate a faulty component / system. If test results indicate a failure after an additional, consecutive driving cycle, the MIL will illuminate and a DTC will set.
The MUT-II selection sequence for obtaining provisional DTCs is shown on the flowchart.
COMMUNICATION MODE
This feature applies only to Mitsubishi engines on 1997-on models.
The new ROM pack gives the MUT-II the ability to recognize whether the vehicle is equipped with a "single" (ISO9141-2 only) type ECM or a "dual" (both ISO9141 MMC Standard and ISO9141-2) type ECM.
The ISO9141-2 communication method is defined by OBD-II regulations as the standard communication method for the ECM. However, the communication speed and the data sampling rate of the ISO9141-2 method is lower than that of ISO9141.
If the ECM is "dual" type, "Check Mode" will display in the menu. "Check Mode" uses the ISO9141 MMC Standard communication method when communicating with the ECM. The MUT-II can read and record service data more precisely and effectively when using "Check Mode."
Data List, Actuator Test, and Drive Recorder functions are available in "Check Mode." However, some items such as Long/Short Term Fuel Trim, Fuel Control Status are not displayed. To read these items, select the "Data List" menu.
The MUT-II selection sequence for changing the communication mode is shown on the flowcharts.
HELP FUNCTION
The Help function in the new ROM pack contains the following Help messages:
NOTE:
Refer to contents of Help messages.
1. Help Message for General Help
This message can be displayed by pressing the F4 Key at the "Main Menu" screen.
The flow chart shows the MUT-II selection sequence for general help.
2. Help Message for Communication Error A
When the communication error occurs after selecting system (MUT-II fails to select system automatically), this message will be displayed by pressing the F4 Key the first time error message "Communication failed" is displayed.
The flowchart shows the MUT-II selection sequence for Communication Error A messages.
3. Help Message for Communication Error B (Non-Serial Type ECM)
When the communication error occurs after selecting system (MUT-II fails to select system automatically), this message is displayed by pressing the F4 Key at the second screen (after pressing right scroll key) of "The old system can be checked..."
The flowchart shows the MUT-II selection sequence for Communication Error B messages.
4. Help Message for Communication Error C
When the serial communication error occurs (MUT-II displays "Comm. Error RETRY. Y? N?", this help message is displayed automatically. The flowchart shows the MUT-II selection sequence for Communication Error C messages.
5. Help Message for ABS
This message is available for S.C.C B001 and B003. When a communication error occurs after erasing DTCs, this message is displayed automatically.
6. Help Message for Check Mode
This message can be displayed by pressing the F4 Key at the "CHECK MODE" screen after selecting it from the Function menu. This message is also displayed automatically when returning from "CHECK MODE" to "GST MODE."
Refer to the flowchart for the MUT-II selection sequence for the "CHECK MODE" screen.
7. Help Message for Test Mode $05
After selecting "HO2S Test Results (Mode 5)" in OBD-II Test Mode, this message is displayed by pressing the F4 Key.
Refer to the flowchart for the MUT-II selection sequence for obtaining HO2S test results.
8. Help Message for Test Mode $07
After selecting "Provisional DTCs (Mode 7)" in OBD-II Test Mode, this message is displayed by pressing the F4 Key at the DTC display screen when a DTC appears. Refer to the flowchart for the MUT-II selection sequence for obtaining provisional DTCs.
OTHER MODIFICATIONS
1. Item Name Sort
With the new ROM pack, the MUT-II displays OBD-II and Mitsubishi original service data items separately. Item names are sorted alphabetically. OBD-II item numbers are displayed on a black background.
The chart shows the item name displays.
2. Modification of Main Menu Flow
The flow from "Main Menu" to "System Select" screen is modified. Also, the "All DTC Check system" selection is deleted.
3. DTC (P-CODE) Name
When using the new ROM pack, all item names for engine DTCs are displayed in the MUT-II screen. Some DTCs have the same P-Code name. Refer to Group 13A in the appropriate service manual for P-Code names Some P-Code names are different for Mitsubishi and Chrysler engines.