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HOMESERVICE MANUALSMAZDA20086 S SPORT, 4D HATCHBACK, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 490 (SYMPTOM TROUBLESHOOTING [ENGINE CONTROL SYSTEM BP, BP WITH TC))ENGINE CONTROL SYSTEM OPERATION INSPECTIONSPARK TEST
2008 Mazda 6 s Sport, 4D Hatchback, Standard

Spark Test

2008 Mazda 6 s Sport, 4D Hatchback, StandardSECTION Spark Test
WARNING: This page is about a different car, the 2005 Mazda MX-5 Miata. However, it is still accessible from the selected car via links, so may be relevant.
  1. Disconnect the negative battery cable.
  2. Disconnect the FP RLY connector.
  3. Verify that each high-tension lead and connector is connected properly.
  4. 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.
SPARK TEST

STEP INSPECTION ACTION
1
  • Remove high-tension lead from spark plug. Hold high-tension lead with installed pliers 5-10 mm {0.20-0.39 in}  from ground.
  • Turn ignition switch to START and verify that there is a strong blue spark. (Inspect each cylinder)
 Yes Ignition system is okay.
No If some cylinders do not spark, go to Step 2.
If all cylinders do not spark, go to Step 3.
2
  • Is high-tension lead resistance correct?
 Yes Inspect high-tension lead and ignition coil for crack or damage.
No Replace the high-tension lead.
3
  • Does PCM or ignition coil connector have poor connection?
 Yes Repair or replace connector.
No Go to the next step.
4
  • Is ignition coil winding resistance okay?
 Yes Go to the next step.
No Replace ignition coil.
5
  • Are following parts okay?
    • CKP sensor and crankshaft pulley (Also, inspect gap.)
    • PCM terminal 3F/3I voltage
 Yes Inspect wiring harness and connectors of CKP sensor for open or short circuit.
No Repair or replace.
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.