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 551 (SYMPTOM TROUBLESHOOTING [ENGINE (L3))ENGINE CONTROL SYSTEM OPERATION INSPECTION [L3]SPARK TEST

2010 Mazda 5 Sport, 2.3 L, Standard

Spark Test

2010 Mazda 5 Sport, 2.3 L, StandardSECTION Spark Test

WARNING: This page is about a different car, the 2008 Mazda 5. However, it is still accessible from the selected car via links, so may be relevant.

Disconnect the fuel pump relay.
Verify that each ignition coil and connector is connected properly.
Inspect the ignition system in the following procedure.
WARNING:
- High voltage in the ignition system can cause strong electrical shock which can result in serious injury. Avoid direct contact to the vehicle body during the following spark test.

SYMPTOM TROUBLESHOOTING CHART - SPARK TEST

STEP	INSPECTION		ACTION
1	Disconnect the ignition coil from the spark plugs. Remove the spark plugs. Verify that the spark plugs do not have carbon deposits. Are the spark plugs normal?	Yes	Go to the next step.
1		No	Perform no-load racing at 4,000 rpm for 2 min, 2 times to burn off the carbon deposits. Repeat Step 1.
2	Inspect the spark plugs for damage, wear, and proper plug gap. Are the spark plugs normal?	Yes	Go to the next step.
2		No	Replace spark plugs, then go to Step 1.
3	Reconnect the spark plugs to the ignition coil. Ground the spark plugs to the engine. Is a strong blue spark visible at each cylinder while cranking the engine?	Yes	Ignition system is normal.
3		No	Some cylinders do not spark: Go to the next step. All cylinders do not spark: Go to Step 5.
4	Inspect the following wiring harnesses for open or short: Ignition coil No.1 terminal B-PCM terminal 2G Ignition coil No.2 terminal B-PCM terminal 2K Ignition coil No.3 terminal B-PCM terminal 2L Ignition coil No.4 terminal B-PCM terminal 2H Are the wiring harnesses normal?	Yes	Inspect and replace the ignition coil. (See IGNITION COIL INSPECTION [L3] .)
4		No	Repair or replace the malfunctioning part, then go to Step.1.
5	Measure the voltage at terminal A in each ignition coils. Is the voltage B+?	Yes	Go to the next step.
5		No	Inspect power supply circuit of ignition coils.
6	Does the PCM connector or ignition coil connectors have poor connection?	Yes	Repair or replace the connector, then go to Step.1.
6		No	Go to the next step.
7	Are the following parts normal? CKP sensor and crankshaft pulley	Yes	Inspect for open or short circuit in wiring harness and connector of CKP sensor.
7		No	Repair or replace the malfunctioning part, then go to Step.1.

RENDER: 1.0x

NO RELATED

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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.