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.
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HOMESERVICE MANUALSMAZDA20086 S SPORT, 4D HATCHBACK, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 5 (ENGINE CONTROLS - TESTS W/CODES - 2.3L)CIRCUIT TESTSDTC P1601 - COMMUNICATION LINE ERROR (AUTOMATIC TRANSMISSION)DIAGNOSIS & REPAIR PROCEDURE
2008 Mazda 6 s Sport, 4D Hatchback, Standard
Diagnosis & Repair Procedure
2008 Mazda 6 s Sport, 4D Hatchback, StandardSECTION Diagnosis & Repair Procedure
WARNING: This page is about a different car, the 1997 Mazda Millenia. However, it is still accessible from the selected car via links, so may be relevant.
- Inspect all applicable harness connectors. Repair as needed. Access TCM harness connector. TCM is mounted to upper left kick panel, behind instrument panel. Access ECM harness connector. ECM is mounted in front of center console, under radio.
- Disconnect ECM and TCM connectors. Using ohmmeter, check continuity between terminal No. 1B on ECM harness connector and terminal No. 2K on TCM harness connector. If continuity exists, go to next step. If continuity does not exist, repair Green wire.
- Check continuity between terminal No. 1F on ECM harness connector and terminal No. 2N on TCM harness connector. If continuity exists, go to next step. If continuity does not exist, repair White/Red wire.
- Erase DTCs. See CLEARING CODES in SELF-DIAGNOSTIC SYSTEM section. If DTC resets, replace ECM. If DTC is not present, intermittent poor harness connection may have caused DTC to originally set.
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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.