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Home >> Mazda >> 2005 >> 6 s, 4D Hatchback, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Symptom Troubleshooting (Engine Control System AJ) >> Engine Control System Operation Inspection >> Spark Test
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Spark Test

  1. Disconnect the fuel pump relay.
  2. Verify that each high-tension lead and connector is connected properly.
  3. 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
  • Disconnect ignition coil from spark plugs.
  • Remove spark plugs.
  • Reconnect spark plugs to ignition coil.
  • Ground spark plugs to engine.
  • Is strong blue spark visible at each cylinder while cranking?
 Yes Ignition system is okay.
No Some cylinders do not spark: 
  • Go to the next step.

All cylinders do not spark: 
  • Go to Step 4.
2
  • Inspect spark plugs for damage, wear, carbon deposits and proper plug gap.
  • Are spark plugs okay?
 Yes Go to the next step.
No Replace spark plugs, then go to Step 1.
3
  • Inspect the following wiring harnesses for open or short circuit:
    • Ignition coil No. 1 terminal B (harness-side) - PCM terminal 52 (harness-side)
    • Ignition coil No. 2 terminal B (harness-side) - PCM terminal 104 (harness-side)
    • Ignition coil No. 3 terminal B (harness-side) - PCM terminal 102 (harness-side)
    • Ignition coil No. 4 terminal B (harness-side) - PCM terminal 78 (harness-side)
    • Ignition coil No. 5 terminal B (harness-side) - PCM terminal 103 (harness-side)
    • Ignition coil No. 6 terminal B (harness-side) - PCM terminal 101 (harness-side)
  • Are wiring harnesses okay?
 Yes Inspect and replace ignition coil. (See IGNITION COIL INSPECTION .)
No Repair or replace malfunctioning part, then go to Step 1.
4
  • Measure voltage at terminal A in each ignition coil.
  • Is voltage B+? 
 Yes Go to the next step.
No Inspect power supply circuit of ignition coils.
5
  • Do PCM connector or ignition coil connectors have poor connection?
 Yes Repair or replace connector, then go to Step 1.
No Go to the next step.
6
  • Are the following parts okay?
    • CKP sensor and crankshaft pulley
    • PCM terminal 1 or 27 voltage

      Specification 

      Approx. 1.5 V 

 Yes Inspect for open or short in wiring harness and connector of CKP sensor.
No Repair or replace malfunctioning part, then go to Step 1.
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