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 MANUALSMAZDA20105 SPORT, 2.3 L, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 62 (ENGINE CONTROLS [SYSTEM & COMPONENT TESTING])FUEL SYSTEMFUEL CONTROLFUEL INJECTOR RESISTANCE - MAZDA6 (3.0L)
2010 Mazda 5 Sport, 2.3 L, Standard
Fuel Injector Resistance - Mazda6 (3.0L)
2010 Mazda 5 Sport, 2.3 L, StandardSECTION Fuel Injector Resistance - Mazda6 (3.0L)
WARNING: This page is about a different car, the 2003 Mazda Protege5, 2003 Mazda Protege, 2003 Mazda MX-5 Miata, 2003 Mazda MPV, and 2003 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.
- Resistance Inspection
Disconnect fuel injector 2-pin harness connector. Using ohmmeter, measure resistance between injector terminals. See FUEL INJECTOR RESISTANCE SPECIFICATIONS table. If fuel injector resistance is as specified, check for open or short circuit, go to next step. If fuel injector resistance reading is not as specified, replace faulty injector(s) as necessary. - Open Circuit Inspection
Disconnect PCM 104-pin harness connector. Check for continuity between following terminals:- No. 1 cylinder fuel injector harness connector terminal "A" (Black/White wire) and PCM 104-pin harness connector terminal No. 75 (Yellow/Black wire).
- No. 2 cylinder fuel injector harness connector terminal "A" (Black/Yellow wire) and PCM 104-pin harness connector terminal No. 101 (Red/Blue wire).
- No. 3 cylinder fuel injector harness connector terminal "A" (Black/Blue wire) and PCM 104-pin harness connector terminal No. 74 (Yellow/Red wire).
- No. 4 cylinder fuel injector harness connector terminal "A" (Black/Orange wire) and PCM 104-pin harness connector terminal No. 100 (Yellow/Blue wire).
- No. 5 cylinder fuel injector harness connector terminal "A" (Black/Green wire) and PCM 104-pin harness connector terminal No. 73 (Black/Red wire).
- No. 6 cylinder fuel injector harness connector terminal "A" (Black/Red wire) and PCM 104-pin harness connector terminal No. 99 (Blue/White wire).
- No. 1 cylinder fuel injector harness connector terminal "B" (Green/White wire) and main relay 4-pin harness connector terminal "C" (White/Blue wire) through common connector.
- No. 2 cylinder fuel injector harness connector terminal "B" (Green/Yellow wire) and main relay 4-pin harness connector terminal "C" (White/Blue wire) through common connector.
- No. 3 cylinder fuel injector harness connector terminal "B" (Green/Blue wire) and main relay 4-pin harness connector terminal "C" (White/Blue wire) through common connector.
- No. 4 cylinder fuel injector harness connector terminal "B" (Green/Red wire) and main relay 4-pin harness connector terminal "C" (White/Blue wire) through common connector.
- No. 5 cylinder fuel injector harness connector terminal "B" (Green/Black wire) and main relay 4-pin harness connector terminal "C" (White/Blue wire) through common connector.
- No. 6 cylinder fuel injector harness connector terminal "B" (Green/Orange wire) and main relay 4-pin harness connector terminal "C" (White/Blue wire) through common connector.
If continuity is present, go to next step. If continuity is not present, repair open circuit in suspect wire or replace wire harness. See appropriate WIRING DIAGRAM under ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS.
- Short Circuit Inspection
Check for continuity between following:- No. 1 cylinder fuel injector harness connector terminal "A" (Black/White wire) and ground.
- No. 2 cylinder fuel injector harness connector terminal "A" (Black/Yellow wire) and ground.
- No. 3 cylinder fuel injector harness connector terminal "A" (Black/Blue wire) and ground.
- No. 4 cylinder fuel injector harness connector terminal "A" (Black/Orange wire) and ground.
- No. 5 cylinder fuel injector harness connector terminal "A" (Black/Green wire) and ground.
- No. 6 cylinder fuel injector harness connector terminal "A" (Black/Red wire) and ground.
- No. 1 cylinder fuel injector harness connector terminal "B" (Green/White wire) and power supply.
- No. 2 cylinder fuel injector harness connector terminal "B" (Green/Yellow wire) and power supply.
- No. 3 cylinder fuel injector harness connector terminal "B" (Green/Blue wire) and power supply.
- No. 4 cylinder fuel injector harness connector terminal "B" (Green/Red wire) and power supply.
- No. 5 cylinder fuel injector harness connector terminal "B" (White/Blue wire) and power supply.
- No. 6 cylinder fuel injector harness connector terminal "B" (Green/Orange wire) and power supply.
If continuity is present, repair short circuit in suspect wire or replace wire harness.
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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.