89790642T Mercury 115HP DFI PCM | Genuine Used Part
89790642T Mercury 115HP DFI PCM | Genuine Used Part
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🔧 Product Description
Genuine Mercury 115HP DFI / OptiMax PCM - Part Number: 89790642T
A genuine Mercury propulsion control module for selected 115HP DFI / OptiMax 1.5L three-cylinder outboards. This PCM manages direct fuel injection, ignition timing, air/fuel control, diagnostics and protection strategy on compatible Mercury and Mariner 115HP DFI engines.
⚙️ Key Features
- Genuine Mercury PCM / propulsion control module
- Correct Mercury part number 89790642T
- Used on 115HP OptiMax / DFI 1.5L three-cylinder outboards
- Related to Mercury PCM family reference 88555747S
- Requires exact serial-number, calibration and engine-family confirmation before installation
🚤 Compatibility
Commonly used on
- Mercury / Mariner 115HP DFI / OptiMax 1.5L three-cylinder outboard electrical systems
Typically suits
- Engine models:
- Mercury 115 DFI / OptiMax 1.5L 3-cylinder applications up to serial 1B417701
- Mercury 115 DFI 1.5L 3-cylinder - serial 0T801000 to 1B226999 where PCM 89790642T / 88555747S is specified
- Mercury 115 DFI 1.5L 3-cylinder - serial 1B227000 to 1B417701
- Mariner 115 DFI 1.5L 3-cylinder - serial 1B227000 to 1B417701
- Mercury 115ELPTO / 115 OptiMax electrical plate applications using 89790642T PCM
- Mercury / Mariner 75HP, 90HP and 115HP 1.5L three-cylinder DFI PCM family applications where the exact serial-numbered PCM position specifies 89790642T
- HP Range: primarily 115HP for 89790642T calibration
- Engine Type: Mercury / Mariner 1.5L three-cylinder DFI / OptiMax outboard
- Year Range: approximately 2004 - 2006 for the core 115HP DFI serial family, with exact fitment by serial number
- Serial Range: commonly up to 1B417701 for 115HP OptiMax / DFI applications
🔌 Function
The PCM controls the OptiMax / DFI engine-management system by processing sensor inputs and commanding direct-injection fuel delivery, ignition timing, air compressor strategy, diagnostics and engine-protection functions.
⚠️ Common Signs of Failure
- No-start with confirmed compressor pressure, fuel pressure and PCM power supply
- No injector or direct-injector command
- No spark command after crank-position and ignition checks
- No communication with diagnostic equipment
- Limp mode, warning horn or protection fault after sensor testing
- Intermittent shutdown or loss of throttle response
- Persistent PCM-related fault codes after wiring and component checks
🔄 Supersession & Cross Reference
OEM Supersession Chain
- 89790642T current PCM reference for listed 115HP DFI applications
OEM / Related Numbers
- 89790642T
- 88555747S
- Related PCM family reference: 88555734S
- Related PCM family reference: 88555726S
- Related PCM family reference: 88555703S
- Related 75HP DFI PCM family reference: 89790640T
- Related 90HP DFI PCM family reference: 89790641T
- Related electrical plate reference: 880190T03
- Related braided cable reference: 858414A1
- Related trim harness reference: 819514T18
Aftermarket / Verified Equivalents
- No aftermarket equivalent
📦 Condition
- Genuine used part
- Removed from running engine where applicable
- In good working condition unless otherwise stated
Shipping & Delivery
Shipping & Delivery
Flat-rate shipping Australia-wide — $14.99 per order, no matter how many parts you add. Orders dispatch from our Kadina, South Australia store. Need it urgently or want to collect in person? Call us on 0412 532 984 before ordering.
Returns & Warranty
Returns & Warranty
14-day change-of-mind returns — if it's not right or you ordered the wrong part, send it back within 14 days in the condition you received it for a refund or exchange. Full details in our Refunds & Returns policy.
Not sure this fits?
Not sure this fits?
Ask us before you buy — we check part numbers and fitment every day. Call 0412 532 984 (Mon–Fri 8.30am–4.30pm) or message us through the contact page with your engine or vehicle details.
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