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Home >> Suzuki >> 2003 >> Aerio GS, AWD, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Basic Diagnostic Procedures >> Circuit Tests >> B-5: Ignition System Check >> Aerio, Grand Vitara, Vitara & XL-7
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Aerio, Grand Vitara, Vitara & XL-7

  1. Perform engine system check. See B-1: ENGINE SYSTEM CHECK  under CIRCUIT TESTS.
  2. Remove spark plugs. See SPARK PLUGS & IGNITION COIL ASSEMBLY under IGNITION SYSTEM in REMOVAL & INSTALLATION article. Check spark plugs for proper application, electrode wear, carbon deposits or insulator damage. If spark plugs are faulty, replace as necessary. If spark plugs are okay, perform spark test. See SPARK TEST  under IGNITION CHECKS. If spark is faulty, go to next step. If spark is okay, go to step  8 .
  3. If no DTCs were retrieved during engine system check, go to next step. If any DTCs were retrieved, perform system test. See appropriate SYSTEM TESTS in appropriate SELF-DIAGNOSTICS article.
  4. Check for proper connection between each ignition coil assembly and spark plug, also between each ignition coil assembly and harness connector and terminals. If connections are okay, go to next step. If connections are faulty, repair as necessary and reconnect securely. After repair, retest system for normal operation.
  5. Check ignition coil power, ground and trigger circuit for open or short. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. If all circuits are okay, go to next step. If any circuit is faulty, repair as necessary. After repair, retest system for normal operation.
  6. Substitute a suspect ignition coil assembly with known-good ignition coil assembly and perform spark test. See SPARK TEST  under IGNITION CHECKS. If test result is faulty, go to next step. If test result is okay, replace ignition coil assembly.
  7. Check Camshaft Position (CMP) sensor circuits for open or short referring to DTC P0340: CAMSHAFT POSITION SENSOR - CIRCUIT MALFUNCTION under DIAGNOSTIC TESTS in appropriate SELF-DIAGNOSTICS article. If test results are okay, substitute ECM with known-good module and repeat test in step  2 .If test results are faulty, repair as necessary. After repair, repeat test in step  2 .
  8. Check ignition timing and timing advance. See IGNITION TIMING in ON-VEHICLE ADJUSTMENTS article. If ignition timing and timing advance are okay, testing is complete. If ignition timing and timing advance are faulty, check timing belt installation and ECM input signals related to ignition system, repair as necessary and adjust ignition timing. After repair, retest system for normal operation.
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