What is the role of the Engine Control Module in managing engine performance and what are the steps involved in its removal on Mazda Millenia?

The ECU oversees the workings of the engine by responding to the input signals of different sensors and adjusting the engine by means of output devices, such as fuel injectors and EGR solenoids. This enables the ECU to check and regulate the key parameters of air/fuel ratio, ignition timing, idle speed and engine temperature, so that the engine could perform optimally to satisfy fuel economy, power and emission control. In the case of ECU it is important to break the negative battery cable to avoid damage by electrical shock. The steps to be followed in the removal process include disconnection of the negative battery cable, the cover of the under dash (drivers side) of the center console unit may be removed and the passenger side cover and driver cover of the centre console unit may be removed, ducts may also be disconnected to the rear heater (where applicable) to access the ECU electrical connectors. In certain models, the trim plate at the center console around the lever of selecting the gears has to be taken away. Lastly, the ECU mounting bolts/nuts are removed and the ECU electrical connectors are disconnected and installation is just the opposite of the first step.

Genuine Mazda Engine Control Module

Engine Control Computer

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379 Engine Control Modules found

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Mazda PCM Part Number: PUYW-18-881C
$347.99 MSRP: $464.08
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Product Specifications
- Other Name: Module, Powertrain Control; ECM, PCM
- Replaces: PUYW-18-881B, PEAW-18-881C, PUYW-18-881A, PEAW-18-881B, PEAW-18-881A, PEAW-18-881D, PEAW-18-881, PUYW-18-881
Fits the following Mazda Models:
- CX-5 | 2013-2016 | Grand Touring, Sport, Touring | 4 Cyl 2.0 L GAS, 4 Cyl 2.5 L GAS
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Mazda PCM Part Number: L3EC-18-881F
$630.54 MSRP: $861.57
You Save: $231.03 (27%)
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Product Specifications
- Other Name: Module, Powertrain Control; PCM
- Replaces: L3EC-18-881C, L3EC-18-881D, L3EC-18-881A, L3EC-18-881B, L3EC-18-881E
Fits the following Mazda Models:
- 3 | 2011-2013 | Mazdaspeed | 4 Cyl 2.3 L GAS
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Mazda PCM Part Number: L5E7-18-881E
$630.54 MSRP: $861.57
You Save: $231.03 (27%)
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Product Specifications
- Other Name: Module, Powertrain Control; PCM
- Replaces: L5E7-18-881C, L5E7-18-881B
Fits the following Mazda Models:
- 3 | 2011 | S | 4 Cyl 2.5 L GAS
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Mazda PCM Part Number: L539-18-881M
$671.96 MSRP: $918.16
You Save: $246.20 (27%)
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Product Specifications
- Other Name: Module, Powertrain Control; PCM
- Replaces: L539-18-881B, L539-18-881C, L539-18-881J, L539-18-881E, L539-18-881D, L539-18-881H, L539-18-881A, L539-18-881G, L539-18-881L, L539-18-881K, L539-18-881F
Fits the following Mazda Models:
- 3 | 2010 | S | 4 Cyl 2.5 L GAS
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Mazda PCM Part Number: LSYF-18-881D
$676.48 MSRP: $924.33
You Save: $247.85 (27%)
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Product Specifications
- Other Name: Module, Powertrain Control; ECM, PCM
- Replaces: LSYF-18-881, LSYF-18-881A
Fits the following Mazda Models:
- 3 | 2010 | i | 4 Cyl 2.0 L GAS
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Mazda PCM Part Number: LSYL-18-881A
$675.36 MSRP: $922.80
You Save: $247.44 (27%)
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Product Specifications
- Other Name: Module, Powertrain Control; PCM
- Replaces: LSYL-18-881, LF8M-18-881F, LF8M-18-881A, LF8M-18-881D, LF8M-18-881G, LF8M-18-881H, LF8M-18-881C, LF8M-18-881E
Fits the following Mazda Models:
- 3 | 2010 | i | 4 Cyl 2.0 L GAS
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Mazda PCM Part Number: L32G-18-881R-0F
$641.70 MSRP: $876.81
You Save: $235.11 (27%)
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Product Specifications
- Other Name: Module, Powertrain Control; ECM
- Replaces: L32G-18-881, L32G-18-881D, L32G-18-881R-0E, L32G-18-881E, L32G-18-881F, L32G-18-881C, L32G-18-881B
Fits the following Mazda Models:
- 3 | 2006-2007 | S | 4 Cyl 2.3 L GAS
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Mazda PCM Part Number: L541-18-881L
$682.09 MSRP: $932.01
You Save: $249.92 (27%)
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Product Specifications
- Other Name: Module, Powertrain Control; ECM
- Replaces: L541-18-881C, L541-18-881E, L541-18-881F, L541-18-881D, L541-18-881K, L541-18-881A, L541-18-881B, L541-18-881G, L541-18-881J, L541-18-881H
Fits the following Mazda Models:
- 3 | 2010 | S | 4 Cyl 2.5 L GAS
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Mazda PCM Part Number: L5YE-18-881
$657.89 MSRP: $898.93
You Save: $241.04 (27%)
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Product Specifications
- Other Name: Module, Powertrain Control; ECM
- Replaces: L5H4-18-881
Fits the following Mazda Models:
- CX-7 | 2012 | Sport, SV, Touring | 4 Cyl 2.5 L GAS
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Mazda PCM Part Number: PE19-18-881A
$696.21 MSRP: $951.29
You Save: $255.08 (27%)
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Product Specifications
- Other Name: Module, Powertrain Control; PCM
Fits the following Mazda Models:
- 3 | 2014-2016 | i Grand Touring, I Sport, i SV, I Touring, s Grand Touring, s Touring | 4 Cyl 2.0 L GAS, 4 Cyl 2.5 L GAS
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Mazda PCM Part Number: PSZG-18-881H
$661.63 MSRP: $904.05
You Save: $242.42 (27%)
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Product Specifications
- Other Name: Module, Powertrain Control; ECM, PCM
- Replaces: PSZG-18-881G, PEDR-18-881B, PSZG-18-881B, PEDR-18-881C, PSZG-18-881, PEDR-18-881, PEDR-18-881A, PSZG-18-881D, PSZG-18-881A
Fits the following Mazda Models:
- 3 | 2013 | i, Mazdaspeed, S | 4 Cyl 2.0 L GAS, 4 Cyl 2.3 L GAS, 4 Cyl 2.5 L GAS
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Mazda PCM Part Number: PYXJ-18-881C
$701.78 MSRP: $958.90
You Save: $257.12 (27%)
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Product Specifications
- Other Name: Module, Powertrain Control; ECM, PCM
- Replaces: PYXJ-18-881, PYXJ-18-881A, PYXJ-18-881B, PY2W-18-881C, PY2W-18-881G, PY2W-18-881A, PY2W-18-881F, PY2W-18-881D, PY2W-18-881E
Fits the following Mazda Models:
- CX-5 | 2014-2016 | Grand Touring, Sport, Touring | 4 Cyl 2.0 L GAS, 4 Cyl 2.5 L GAS
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Mazda PCM Part Number: N3R5-18-881M
$666.72 MSRP: $910.99
You Save: $244.27 (27%)
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Product Specifications
- Other Name: Module, Powertrain Control; PCM
- Replaces: N3R5-18-881L, N3R5-18-881H, N3R5-18-881C, N3R5-18-881E, N3R5-18-881J, N3R5-18-881D, N3R5-18-881F, N3R5-18-881G
Fits the following Mazda Models:
- RX-8 | 2009-2011 | Grand Touring, R3, Sport, Touring | 2 Cyl 1.3 L GAS
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Mazda PCM Part Number: PYXR-18-881C
$691.47 MSRP: $944.82
You Save: $253.35 (27%)
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Product Specifications
- Other Name: Module, Powertrain Control; ECM, PCM
- Replaces: PY3X-18-881F, PYXR-18-881, PY3X-18-881C, PY3X-18-881G, PYXR-18-881B, PY3X-18-881D
Fits the following Mazda Models:
- CX-5 | 2014-2016 | Grand Touring, Sport, Touring | 4 Cyl 2.0 L GAS, 4 Cyl 2.5 L GAS
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Mazda PCM Part Number: N3R7-18-881M
$693.58 MSRP: $947.71
You Save: $254.13 (27%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Module, Powertrain Control; ECM
- Replaces: N3R7-18-881H, N3R7-18-881C, N3R7-18-881J, N3R7-18-881F, N3R7-18-881D, N3R7-18-881E, N3R7-18-881L, N3R7-18-881G
Fits the following Mazda Models:
- RX-8 | 2009-2011 | Grand Touring, R3, Sport, Touring | 2 Cyl 1.3 L GAS
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Mazda PCM Part Number: PYFL-18-881
$745.30 MSRP: $1018.37
You Save: $273.07 (27%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Module, Powertrain Control; PCM
Fits the following Mazda Models:
- 6 | 2018-2021 | Carbon Edition, Grand Touring, Grand Touring Reserve, Signature | 4 Cyl 2.5 L GAS
- CX-5 | 2019-2024 | 2.5 Turbo, 2.5 Turbo Signature, Carbon Edition Turbo, Grand Touring Reserve, Signature | 4 Cyl 2.5 L GAS
- CX-9 | 2016-2023 | Carbon Edition, Grand Touring, Signature, Sport, Touring, Touring Plus | 4 Cyl 2.5 L GAS
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Mazda PCM Part Number: APYB-18-881E
$705.82 MSRP: $964.43
You Save: $258.61 (27%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Module, Powertrain Control; PCM
- Replaces: APYB-18-881, AJJ4-18-881E, APYB-18-881D, AJJ4-18-881, APYB-18-881C
Fits the following Mazda Models:
- 6 | 2008 | i, S | 4 Cyl 2.3 L GAS, 6 Cyl 3.0 L GAS
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Mazda PCM Part Number: LFNF-18-881
Product Specifications
- Other Name: Module, Powertrain Control; PCM
- Replaces: LFJG-18-881A, LFJG-18-881B
Fits the following Mazda Models:
- 3 | 2012-2013 | i | 4 Cyl 2.0 L GAS
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Mazda PCM Part Number: PYXK-18-881C
Product Specifications
- Other Name: Module, Powertrain Control; ECM, PCM
- Replaces: PYXK-18-881, PY2V-18-881G, PY2V-18-881C, PYXK-18-881A, PY2V-18-881D, PY2V-18-881F
Fits the following Mazda Models:
- CX-5 | 2014-2016 | Grand Touring, Sport, Touring | 4 Cyl 2.0 L GAS, 4 Cyl 2.5 L GAS
View related parts
Mazda PCM Part Number: PYXL-18-881C
Product Specifications
- Other Name: Module, Powertrain Control; ECM, PCM
- Replaces: PY2X-18-881G, PY2X-18-881F, PYXL-18-881B, PY2X-18-881E, PYXL-18-881A, PY2X-18-881D, PYXL-18-881, PY2X-18-881C
Fits the following Mazda Models:
- CX-5 | 2014-2016 | Grand Touring, Sport, Touring | 4 Cyl 2.0 L GAS, 4 Cyl 2.5 L GAS

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Mazda Engine Control Module

The Mazda Engine Control Module is continually working to ensure every Mazda powertrain is eager, responsive, and efficient by constantly analyzing data from dozens of sensors. Founded in Japan and famous for the rotary engine, Mazda carries a tradition of daring technology that now includes Skyactiv motors, Kodo styling, i-Activsense safety aids, and growing electric options, all aimed at delivering a spirited yet responsible drive. Drivers love the way Mazda combines tight steering with cabins stuffed full of intelligent digital functions, and the brand actually puts i-Activ AWD through its paces on rugged trails to ensure there is confidence in all conditions. That same quest for balance guides the Engine Control Module, a compact computer that reads airflow, throttle angle, and temperature signals in milliseconds, then adjusts fuel spray and spark timing so torque feels lively while gasoline use stays low. Because of its connection to transmissions, stability systems, and cruise features, the Engine Control Module is the central coach type that ensures each part works in concert rather than fighting for control. Software updates allow the unit to refine calibrations as fuels or regulations change, adding value across the entire Mazda lineup without requiring any hardware swaps. Quick logic, long-lasting circuits, and seamless network communication give each vehicle the invisible edge, turning raw mechanical power into harmonized motion with a natural, fun sense.

You'll get great performance and real durability when you pick genuine OEM Engine Control Module. Mazda builds these using high-quality materials and official factory methods to ensure they hold up mile after mile. You deserve that Mazda reliability without the headache of cheap knockoffs. It is easy to find exactly what you need in our huge inventory of genuine parts. Plus, every OEM part carries a real manufacturer's warranty for your peace of mind. You will love our low prices too. Order today and we will ship your brand-new parts fast. They often reach your door in just a few days.

Mazda Engine Control Module Parts and Q&A

ECM
KJZ2-18-881R-00
Q: What is the role of the Engine Control Module in managing engine performance and what are the steps involved in its removal on Mazda Millenia?
A:
The ECU oversees the workings of the engine by responding to the input signals of different sensors and adjusting the engine by means of output devices, such as fuel injectors and EGR solenoids. This enables the ECU to check and regulate the key parameters of air/fuel ratio, ignition timing, idle speed and engine temperature, so that the engine could perform optimally to satisfy fuel economy, power and emission control. In the case of ECU it is important to break the negative battery cable to avoid damage by electrical shock. The steps to be followed in the removal process include disconnection of the negative battery cable, the cover of the under dash (drivers side) of the center console unit may be removed and the passenger side cover and driver cover of the centre console unit may be removed, ducts may also be disconnected to the rear heater (where applicable) to access the ECU electrical connectors. In certain models, the trim plate at the center console around the lever of selecting the gears has to be taken away. Lastly, the ECU mounting bolts/nuts are removed and the ECU electrical connectors are disconnected and installation is just the opposite of the first step.