Diagnostic procedure

• Verify following:
  • Vacuum connection.
  • Air cleaner element.
  • No air leakage from intake-air system.
  • No restriction of intake-air system.
  • Proper sealing of intake manifold and components attached to intake manifold: EGR valve, IAC valve.
  • Fuel quality: proper octane, contamination, winter/summer blend.
• Are all items okay?

• Connect WDS or equivalent to DLC-2.
• Turn ignition key to ON (Engine OFF).
• Retrieve any DTCs.
• Is "PASSED" displayed?

• Is engine overheating?

• Connect WDS or equivalent to DLC-2.
• Access RPM, MAF, TP and VSS PIDs.
• Drive vehicle with monitoring PIDs.
• Are PIDs within specification? (See PCM INSPECTION USING THE SST (WDS OR EQUIVALENT) .)

• Inspect CKP sensor and related harness for vibration and/or intermittent open/short circuit.

MAF PID: 

• Inspect for intermittent open circuit of MAF sensor and related wire harness.

  TP PID: 

  • Inspect if TP sensor output increases smoothly.

  VSS PID: 

  • Inspect for intermittent open circuit of VSS and related wire harness.

• Visually inspect CKP sensor and teeth of crankshaft pulley.
• Are CKP sensor and teeth of crankshaft pulley okay?

• Inspect spark plug conditions.
• Is spark plug wet, covered with carbon or grayish white?

• Inspect for fuel leakage from fuel injector.
• Inspect ignition system for suspect cylinder.

Spark plug is grayish white: 

• Inspect for clogged fuel injector.

• Remove and shake PCV valve.
• Does PCV valve rattle?

• Inspect for restriction in the exhaust system.
• Is there any restriction?

• Install fuel pressure gauge between pulsation damper and fuel distributor.
• Connect jumper wire between F/P terminal at DLC in engine compartment and GND.
• Turn ignition key to ON (Engine OFF).
• Is fuel line pressure correct with ignition key at ON?

Fuel line pressure 420-460 kPa {4.3-4.6 kgf/cm2, 61-66 psi} 

• Inspect fuel pump circuit.
• Inspect for open fuel pump relief valve.
• Inspect for fuel leakage inside pressure regulator.
• Inspect for clogged main fuel line.

High: 

• Inspect pressure regulator for high pressure cause.
• Inspect for clogged fuel return line.

• Inspect IMCC operation.
• Does IMCC work properly?

• Connect pressure gauge to A/C low and high side pressure lines.
• Turn A/C on and measure low side and high side pressures.
• Are pressure within specifications? (See REFRIGERANT PRESSURE CHECK .)

• Refrigerant charging amount.
• Condenser fan operation.

• Inspect A/C cut-off operation.
• Does A/C cut-off work properly?

• Disconnect vacuum hose between purge solenoid valve and intake manifold from purge solenoid valve side.
• Plug opening end of vacuum hose.
• Drive vehicle.
• Does engine condition improve?

• Visually inspect CMP sensor and projections of camshaft pulley.
• Are CMP sensor and projections of camshaft pulley okay?

• Inspect EGR system.
• Is EGR system okay?

• Is engine compression correct?
• (See COMPRESSION INSPECTION .)

• Valve timing.
• Internal transaxle components.
• Brake system for dragging.

• Verify test results:
  • If okay, return to diagnostic index to service any additional symptoms.
  • If malfunction remains, inspect related Service Bulletins and/or On-line Repair Information and perform repair or diagnosis.
    • If vehicle is repaired, troubleshooting completed.
    • If vehicle is not repaired or additional diagnostic information is not available, replace or reprogram PCM.