Module 16 - Subaru Hitachi

Caption:

• RD: Read
• WR: Write
• CK: Checksum correction
• NC: Checksums are not used

Supported ECU

• Forester, Impreza, Legacy 2000-2002 K-Line (UJ WA12212920/128KB)[RD/WR/NC]
• Forester, Impreza, Legacy 2000-2002 K-Line (UJ WA12212930/256KB) [RD/WR/NC]
• Forester, Impreza, Legacy 2002-2005 K-Line (UJ/Hitachi WA12212940/384KB)[RD/WR/NC]
• Forester, Impreza, Legacy 2002-2005 K-Line (UJ/Hitachi WA12212970/512KB) [RD/WR/NC]
• Forester 2006, Impreza 2006-2007 K-Line (Hitachi WA12212970WWW/512KB) [RD/WR/CK]
• Forester 2007-2008, Impreza 2008+, Legacy 2006+ CAN (Hitachi WA12212970WWW/512KB) [RD/WR/CK]
• Forester 2009-2011/Legacy 2010-2011 CAN (Hitachi SH7058/1MB) [RD/WR/CK]
• Forester 2013+ CAN (Hitachi SH7059/1.5MB) [RD/WR/CK]
• Forester 2013+ CAN (Hitachi SH72543/2MB) [RD/WR/CK]

A new module was recently added. It supports Hitachi ECUs from around 2006 to 2011. These are for naturally aspirated engines of 1.5L and 2.0L.

There are three types:

• Forester 2006, Impreza 2006-2008 K-Line (Hitachi WA12212970/512KB)
• Forester 2007-2008, Legacy 2006+ CAN (Hitachi WA12212970/512KB)
• Forester 2009-2011, Legacy 2010-2011 CAN (Hitachi SH7058/1MB)

The years mentioned are model years and may require clarification.

Reading time for CAN-based ECUs is 7 to 15 minutes, while writing takes 1 to 2 minutes. The K-Line ECUs reads in about 3.5 minutes, and writing takes about 7 minutes. The CAN ECU with the 970 processor can also be read via K-Line for faster results. The times provided are from memory and will be verified later.

Working with modules usually starts with identification.

I recommend selecting: “Forester 2007-2008, Legacy 2006+ CAN (Hitachi WA12212970/512KB)” and attempting to identify.

If successful, you’re dealing with a CAN ECU. Next, check the Software Version (similar to ROMID). We are interested in the first digit.

If it’s “5”, it’s likely an ECU with the SH7058 processor.

If it’s “4”, it’s a WA12212970 ECU.

If no response follows, select the first module (K-Line). Check the Software Version.

If there’s no response, it’s an older ECU that doesn’t support the required SSM protocol level.

If the version starts with “4”, it’s the required block with K-Line or CAN.

If the ID starts with “3”, it’s likely a WA12212970 block with an unsupported reprogramming protocol (before 2006).

Visually, you can identify a WA12212970 ECU by the board. If only SMD components are installed, it’s a “new” ECU and likely supported.

If the board has large leaded resistors, it’s an older ECU.

Both WA12212970 ECUs can be read via K-Line, which is the fastest option. The SH7058 ECU is read via CAN.

After reading/writing via CAN, the ignition needs to be cycled. For writing K-Line ECU, the Green Test Connectors must be connected, but this is not required for CAN ECU. Before writing, it’s recommended to disconnect the fan plug and remember to reconnect it afterward.

If there’s a loss of connection during writing, restart the process without turning off the ignition. If problems arise, enable “recovery mode” in the settings. Note that the full file is always written, so the block is “alive” as long as the ignition remains on.

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