ROSS UZ MT02 module with code E01998P2: technical characteristics, malfunctions and repairs

Module ROSS UZ MT02 E01998P2 is an electronic control unit that is installed on cars UAZ Patriot, Hunter and Pickup with diesel engines ZMZ-514 (Euro-3/Euro-4). Code E01998P2 indicates a specific firmware revision and hardware modification of the unit, which is critical when selecting a replacement or repair. Unlike earlier versions (eg E01998P1), this module supports working with advanced diagnostics via CAN bus and adapted to Euro-4 toxicity standards.

The main problem that owners face is incompatibility of firmware between revisions P1 and P2 when attempting a software recovery. For example, firmware from E01998P1 will not work correctly on E01998P2, which leads to errors in engine operation or complete failure of the unit. In this article, we will look at how to identify the module, diagnose typical faults and carry out repairs without the risk of “bricking” the ECU.

How to recognize the ROSS UZ MT02 E01998P2 module?

Externally the block ROSS UZ MT02 It is an aluminum case with an 80-pin connector. Key version differences E01998P2:

• 🔹 Markings on the body: inscription E01998P2 lasered next to the serial number (usually starting with MT02-...).
• 🔹 Diagnostic connector: presence of additional contact for CAN-High (pin 61), missing in earlier revisions.
• 🔹 Firmware: when reading through K-Line or CAN The software identifier contains a suffix _P2 (for example, UZ_514_E4_P2_v1.05).

To accurately determine the version, connect a diagnostic scanner (for example, OpenDiag or ScanDoc) and check the field ECU Part Number in section Identification. If it is indicated there E01998P2 - this is your block. The mistake many car owners make is buying a block with markings P1“because it’s cheaper”, which leads to problems with engine starting or activation emergency mode.

Typical faults and their symptoms

Module ROSS UZ MT02 E01998P2 Most often it fails for three reasons: voltage drops (especially when “lighting” from another car), contact corrosion and incorrect firmware update. The problem can be recognized by the following signs:

Particularly dangerous are cases when the block “goes into defense” after unsuccessful firmware. For example, if you interrupt the update process after Bootloader, The ECU can block writing to memory, and it can only be restored with the help of soldering station (flashing via BDM port).

Module diagnostics: step-by-step instructions

Before removing the unit for repair, perform a basic check:

🔧 Disconnect battery mass for 10 minutes (error reset)

🔧 Check the voltage at the battery terminals (should be ≥12.4V)

🔧 Clean the ECU connector contacts with alcohol or contact cleaner

🔧 Connect the scanner and read errors (even if the “Check” is not lit)

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If errors are present, write down their codes and decipher them using the table above. For in-depth diagnostics you will need:

1. Continuity of circuits: use a multimeter to check the resistance between the ECU connector terminals and the sensors (for example, the resistance of the temperature sensor should be ~2.5 kOhm at 20°C).
2. Power check: there should be a stable voltage on pins 37 (+12V) and 19 (ground). If it sags when starting, look for a breakdown in the on-board network.
3. CAN bus test: connect an oscilloscope to pins 6 and 14. When the ignition is running, pulses with an amplitude of ~2.5V should be observed.

If the unit shows no signs of life (no communication, the LED on the board does not blink), it will most likely need to be opened. Attention: When disassembling the case, avoid static electricity - memory chips AM29F400 sensitive to discharges!

Repair of ROSS UZ MT02 E01998P2 unit

Most malfunctions of this module can be eliminated without complete replacement. Let's consider typical cases:

1. Firmware recovery

If the block is “locked” after an unsuccessful update, you will need:

• 🔧 Programmer OpenPort 2.0 or K-TAG with adapter for BDM.
• 🔧 Firmware file strictly for version P2 (you can download it on the forums UAZbuka or Drive2).
• 🔧 Power supply 5V/2A for stable operation of the programmer.

Process:

1. Connect BDM adapter to the connector on the board (located next to the memory chip).
2. In the program K-TAG select protocol Motorola HC12 BDM.
3. Read the current firmware (if possible) and save a dump.
4. Write a new file after checking the checksum.

2. Board repair

Frequent problems:

- Burnt tracks near the power connector (pins 37, 19). Restored by soldering jumpers.

- Swollen capacitors (usually 1000 µF/16V next to the stabilizer 7805). Replaced with analogues with low ESR.

- Oxidation of contacts microcircuits MC9S12XDP512. Clean with alcohol and a brush.

Use solder for soldering POS-61 and flux RMA-223. After repair, be sure to check the unit on a stand before installing it in the car!

Selection of analogues and compatibility

If repair is not possible, you will have to look for a replacement. Main rule: the block must be of the same revision (P2), otherwise the firmware will not work. The table below shows proven analogues:

When purchasing a used unit, be sure to ask the seller:

• 📸 Photo of markings with serial number.
• 📄 Diagnostic log (to make sure that the unit is not in “emergency mode”).
• 🔧 Return guarantee (many “donors” are sold with hidden defects).

Firmware and calibration after replacement

Even if you installed an identical block E01998P2, it's necessary adapt to your engine. To do this:

1. Connect the scanner and reset errors (command Clear DTC).
2. Start the engine and let it idle for 10 minutes (the ECU will record the basic parameters).
3. Swipe throttle calibration through the scanner menu (Throttle Adaptation).
4. Take a test drive with smooth acceleration to 60 km/h and check for no jerking.

If after replacement the block gives an error P0603 (“EEPROM error”), which means the memory chip is damaged 24C02. You can replace it yourself, but you will need firmware with the correct calibrations for your engine.

Frequent errors when working with the module

Many car owners aggravate their problems with ROSS UZ MT02 due to ignorance of the nuances. That's it can't do:

⚠️ Attention: Never connect the unit to power without a load (for example, when testing on a table). Without connected sensors and actuators, the ECU may generate false errors and block operation.

• 🚫 Use firmware from E01998P1 - this will lead to unstable engine operation or activation of emergency mode.
• 🚫 Solder the board without grounding and an antistatic bracelet - static kills the microcontroller.
• 🚫 Connect the unit to the on-board network with a voltage above 14.5V - the stabilizer will burn out 7805.
• 🚫 Update firmware via OBD-II adapters based ELM327 - they work unstable with the protocol KWP2000.

If you are not confident in your skills, it is better to contact specialists who work with ROSS UZ MT02 directly. For example, in Moscow such services are provided by ChipTuning Profi or AvtoElektronika on Kolomenskaya.

FAQ: Answers to frequently asked questions

1: BKGD
2: VCC (5V)
3: GND
4: DSC
5: DSI
6: CLK