TROUBLESHOOTING
F2–199
F2
NO.13 KNOCKING/PINGING
A6E408018881215
Diagnostic Procedure
13 KNOCKING/PINGING
DESCRIPTION • Excessive shrilly knocking sound from engine.
POSSIBLE
CAUSE
• Poor fuel quality
• Air leakage from intake-air system
• Intake-air system restriction or clogging
• Variable swirl control (VSC) system malfunction
• Variable boost control (VBC) system malfunction
• Intake shutter valve stuck close
• VSC valve stuck close
• Glow system malfunction
• Low engine compression
• Improper valve timing
• Low coolant temperature
• Incorrect fuel injection timing
• Erratic signal from CKP sensor
• Erratic signal from CMP sensor
• ECT sensor or related circuit malfunction
• MAF/IAT sensor or related circuit malfunction
• IAT sensor No.2 or related circuit malfunction
• Boost sensor or related malfunction
• Fuel pressure sensor or related circuit malfunction
• Accelerator position sensor or related circuit malfunction
• Excessive fuel pressure
• Fuel return line clogging or restriction
• EGR system malfunction
• Exhaust system and/or catalyst converter restriction
• Turbocharger malfunction
• Charge air cooler malfunction
• Suction control valve malfunction (built-in supply pump)
Warning
The following troubleshooting flow chart contains the fuel system diagnosis and repair
procedures. Read the following warnings before performing the fuel system services:
• Fuel vapor is hazardous. It can easily ignite, causing serious injury and damage. Always keep
sparks and flames away from fuel.
• Fuel line spills and leakage are dangerous. Fuel can ignite and cause serious injury or death
and damage. Fuel can also irritate skin and eyes. To prevent this, always complete “BEFORE
REPAIR PROCEDURE” and “AFTER REPAIR PROCEDURE” described in this manual.
STEP INSPECTION RESULTS ACTION
1 Does engine run cold? Yes Go to symptom troubleshooting “NO.18 COOLING
SYSTEM CONCERNS—RUNS COLD”.
No Go to next step.
2 Inspect for following:
• Fuel quality (e.g.: including water
contamination, winter/summer blend)
• Fuel return line clogging and/or restriction
• Intake-air system restriction or clogging
• Exhaust system and/or catalyst converter
restriction or clogging
• Charge air cooler condition (restriction or
damaged)
Are all items okay?
Yes Go to next step.
No Service as necessary.
Repeat Step 2.
3 Connect WDS or equivalent to DLC-2.
Access ECT PID.
Verify ECT PID is above 80 °C {176 °F}?
Yes Go to next step.
No Inspect ECT PID.
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