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Home >> Suzuki >> 2001 >> XL-7 Limited >> Repair and Diagnosis >> External Pages >> Different car >> Section 16 (Engine Controls - Self-Diagnostics - 1.6L) >> Diagnostic Tests >> DTC P0300, DTC P0301, DTC P0302, DTC P0303 Or DTC P0304 >> Diagnosis & Repair Procedure

Diagnosis & Repair Procedure

WARNING: This page is about a different car, the 2002 Suzuki Esteem. However, it is still accessible from the selected car via links, so may be relevant.
  1. If engine system check has been performed, go to next step. If engine system check has not been performed, go to A4: ENGINE SYSTEM CHECK  under SYSTEM TESTS.
  2. Check for DTCs. See RETRIEVING DIAGNOSTIC TROUBLE CODES  . If DTCs other than DTC P0171, P0172, P0300, P0301, P0302, P0303 or P0304 is set, repair those DTCs first. See DIAGNOSTIC TROUBLE CODE DEFINITIONS  . If no other DTC is set, go to next step.
  3. Ensure fuel tank is not empty. Add fuel as necessary and go to next step.
  4. Remove spark plugs and check gap. Gap should be .028-.031 in. (.7-.8 mm). Check for carbon deposits or cracked insulators. Ensure correct spark plugs are installed. If problem is found, repair or replace as necessary. After repair, repeat DTC CONFIRMATION TEST  . Disconnect all fuel injector harness connectors. Using a spark tester, ensure a strong, Blue spark is present at each plug wire. If a strong, Blue spark is present at each plug wire, reconnect injector harness connectors and go to next step. If no spark or a weak spark is present, check ignition system components. See IGNITION CHECKS in BASIC DIAGNOSTIC PROCEDURES article.
  5. Check fuel pressure. See FUEL SYSTEM in BASIC DIAGNOSTIC PROCEDURES article. Fuel pressure should be 38-44 psi (2.7-3.1 kg/cm2 ) with key on and engine off, and 28-34 psi (2.0-2.4 kg/cm2 ) with engine running at idle. If fuel pressure is as specified, go to next step. If fuel pressure is not as specified, go to FUEL SYSTEM in SYSTEM & COMPONENT TESTING article. If no problem is found, go to next step.
  6. Inspect fuel injectors and fuel system circuit. Go to, FUEL SYSTEM in SYSTEM & COMPONENT TESTING article. If problem is found, repair as necessary. After repair, repeat DTC CONFIRMATION TEST  . If fuel system is okay, go to next step.
  7. Disconnect PCV valve from valve cover. Start engine and allow it to idle. Check for vacuum at PCV valve. If vacuum is not present, disconnect PCV valve from hose. If engine runs rough or stalls, replace PCV valve. If engine does not run rough or stall, check for restriction in PCV hose. If problem is found, repair as necessary. After repair, repeat DTC CONFIRMATION TEST  . If PCV system is okay, go to next step.
  8. Ensure engine is cool. Disconnect purge hose from EVAP canister. See Fig 1 . Start engine and allow it to idle. Place finger over end of disconnected hose. If no vacuum is present, go to next step. If vacuum is present, check for EVAP control system malfunction. See FUEL EVAPORATION under EMISSION SYSTEM & SUB-SYSTEMS in SYSTEM & COMPONENT TESTING article. If problem is found, repair as necessary. After repair, repeat DTC CONFIRMATION TEST  .
  9. Check MAP sensor operation. Perform diagnosis procedure in DTC P0106: MANIFOLD PRESSURE SENSOR CIRCUIT - PERFORMANCE PROBLEM  . If problem is found, repair as necessary. After repair, repeat DTC CONFIRMATION TEST  . If MAP sensor operation is okay, go to next step.
  10. Check ECT sensor operation. See appropriate procedure under ENGINE SENSORS & SWITCHES in SYSTEM & COMPONENT TESTING article. If problem is found, repair as necessary. After repair, repeat DTC CONFIRMATION TEST  . If ECT sensor operation is okay, go to next step.
  11. Check engine compression. Engine compression should be a minimum of 156 psi (11 kg/cm2 ) at 250 RPM with a maximum variation of 14 psi. If engine compression is okay, check valve lash and valve timing. See appropriate article in ENGINES. If problem is found, repair as necessary. After repair, repeat DTC CONFIRMATION TEST  . If no problem is found, go to next step.
  12. Check ECM harness connections and grounds for corrosion or loose terminals. If problem is found, repair as necessary. After repair, repeat DTC CONFIRMATION TEST  . If connections are okay, problem is probably intermittent. See INTERMITTENTS in TROUBLE SHOOTING - NO CODES article.
Fig 1: Identifying EVAP Canister Purge Hose
G00042195Courtesy of SUZUKI OF AMERICA CORP.
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