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.
Dr9 - Code 42 & ATM Test Results "NNN" (ASD Relay To Logic Module CKT)
Turn ignition off. Disconnect logic module Blue connector. Connect voltmeter to Blue connector cavity No. 6 and ground. Turn ignition switch to "RUN" position. Press ATM button on diagnostic readout box (DRB). Voltmeter reading should be within one volt of battery voltage. If voltage reading is okay, replace logic module. If voltage reading is not okay, repair wire to cavity No. 6 for an open circuit to relay.
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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.