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2008 - MX-5 - Transmission/Transaxle


Automatic Transmission Fluid (ATF) Level Inspection



1. Lift up the vehicle.
2. Remove the filler plug and O-ring.


3. Remove the overflow plug and the overflow plug gasket.
4. Fill with ATF from the filler plug hole until it starts flowing from the overflow orifice.
Supplemental ATF amount (approx. quantity)


Supplemental ATF amount

Procedure including ATF draining

  • Transmission replacement

  • Torque converter replacement

  • Oil cooler replacement

  • Control valve body replacement

  • TFT sensor replacement

Fill ATF to the specified amount (approx. quantity: 7.4 L {7.8 US qt, 6.5 lmp qt})

Procedure without ATF draining

  • Oil seal (extension housing) replacement

  • Fixing oil leakage or stains

Add small amount of ATF


5. Coat a new O-ring with ATF, and install it to the filler plug.
6. Temporarily tighten the overflow plug.
7. Start the engine and warm it up by idling to increase the ATF temperature.


8. Shift to all ranges, from the P position to the D range, taking 2 s or more for each position or range, then after repeating the procedure two times, shift to the P position again.


9. Verify that the ATF temperature is in the proper range (50—60 °C {122—140 °F}). (See Using the M-MDS.)(See Using the AT warning light.)
10. Remove the overflow plug and inspect whether the ATF is flowing from the overflow orifice with the transmission in park and engine idling.

11. Wait until the ATF starts dripping from the overflow plug.


12. If ATF dripping is verified, install a new overflow plug gasket and overflow plug.
13. Wipe off any ATF drips after tightening the overflow plug.
14. Lower the vehicle.

ATF Temperature Verification

Using the M-MDS
1. Connect the M-MDS to the vehicle DLC-2.

2. Verify the ATF temperature using the PID/data monitor “TFT”.
3. Warm up the automatic transmission until the ATF temperature is 50—60 °C {122—140 °F}.
Using the AT warning light
1. Short the TFT check connector terminal A and B of the TCM.

2. Perform the following operations to activate the control for the oil level adjustment.


AT warning light illumination chart for ATF level adjustment

ATF condition

Time chart

ATF Temperature below 50 °C {122 °F}

  • ATF temperature is lower than a ATF level adjustable temperature.

ATF Temperature 50—60 °C {122—140 °F}

  • ATF temperature is same a ATF level adjustable temperature.

ATF Temperature above 60 °C {140 °F}

  • ATF temperature is higher than a ATF level adjustable temperature.

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