Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

1995 Lexus ES 300FACTORY OEM SERVICE PROCEDURE

ECM Ground Circuits

WARNING: This page is about a different car, the 1995 Lexus LS 400. However, it is still accessible from the selected car via links, so may be relevant.

For ECM location, see COMPONENT LOCATIONS under INTRODUCTION. Measure resistance between engine (ground) and specified terminals of ECM connector. See ECM GROUND CIRCUITS table. If resistance is more than one ohm, repair ground circuit. If resistance is one ohm or less, ground circuit is okay (ECM may be faulty).

ECM GROUND CIRCUITS

ECM Connector ⁽¹⁾

⁽¹⁾ ECM Terminals No. (Wire Color)

E12

15 (⁽²⁾ White/Black)

E14

33 & 34 (⁽³⁾ White/Black)

⁽¹⁾	See Fig 1.

⁽²⁾	Attached to right cylinder head.

⁽³⁾	Attached to left cylinder head.

Fig 1: Identifying ECM Terminals

Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.