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Home >> Mazda >> 2012 >> 3 i SV, 2.0L Eng VIN F >> Repair and Diagnosis >> Engine Performance >> System >> Symptom Troubleshooting [Engine Control System MZR 2.0, MZR 2.5] >> Engine Control System Operation Inspection >> Spark Test

Spark Test

  1. Disconnect the fuel pump relay.
  2. Verify that each ignition coil 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.
STEP INSPECTION ACTION
1
  • Disconnect the ignition coil from the spark plugs.
  • Remove the spark plugs.

    (See SPARK PLUG REMOVAL/INSTALLATION .)

  • Verify that the spark plugs do not have carbon deposits.
  • Are the spark plugs normal?
 Yes Go to the next step.
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.
No Replace spark plugs, then go to Step 1.
(See SPARK PLUG REMOVAL/INSTALLATION .)
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.
No Some cylinders do not spark:
  • Go to the next step.

All cylinders do not spark:
  • Go to Step 5.
4
  • Inspect for open or short circuit between the following terminals:
    • Ignition coil No.1 terminal C (wiring harness-side)-PCM terminal 2G (wiring harness-side)
    • Ignition coil No.2 terminal C (wiring harness-side)-PCM terminal 2K (wiring harness-side)
    • Ignition coil No.3 terminal C (wiring harness-side)-PCM terminal 2L (wiring harness-side)
    • Ignition coil No.4 terminal C (wiring harness-side)-PCM terminal 2H (wiring harness-side)
  • Is there any malfunction?
 Yes Repair or replace the suspected wiring harness, then go to Step 1.
No Inspect and replace the ignition coil.
(See IGNITION COIL INSPECTION .)
(See IGNITION COIL REMOVAL/INSTALLATION .)
5
  • Measure the voltage at terminal A (wiring harness-side) in each ignition coils.
  • Is the voltage B+  ?
 Yes Go to the next step.
No Inspect the power supply circuit of ignition coils.
6
  • Switch the ignition to off.
  • Disconnect the ignition coil connector.
  • Inspect for continuity between terminal B (wiring harness-side) in each ignition coils and body ground.
  • Is there continuity?
 Yes Go to the next step.
No Repair or replace the wiring harness for a possible open circuit, then go to Step 1.
7
  • Inspect the PCM and ignition coil connector or terminals for poor connection.
  • Is there any malfunction?
 Yes Repair or replace the malfunctioning connector or terminals, then go to Step.1.
No Go to the next step.
8 Yes Repair or replace the malfunctioning part according to the inspection result, then go to Step.1.
No Inspect for open or short circuit in wiring harness and connector of CKP sensor.
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