NO.13 KNOCKING/PINGING-ACCELERATION/CRUISE [ZJ, ZY]
id0103b0812100
13 |
KNOCKING/PINGING—ACCELERATION/CRUISE |
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DESCRIPTION
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• Sound is produced when air/fuel mixture is ignited by something other than spark plug (such as hot spot in combustion chamber).
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POSSIBLE CAUSE
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• Engine overheating (due to cooling system malfunction)
• IAT sensor malfunction
• MAF sensor malfunction
• KS malfunction
• Erratic signal from CMP sensor
• Inadequate engine compression
• Inadequate fuel pressure
• PCM malfunction
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Diagnostic procedure
STEP |
INSPECTION |
ACTION |
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1
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Connect the M-MDS to the DLC-2.
Perform the PID/DATA Monitor and Record Procedure and access the ECT PID.
Verify the ECT PID is less than 116°C {241°F}during driving.
Is the ECT PID less than the specification?
(See PCM INSPECTION [ZJ, ZY].)
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Yes
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Go to the next step.
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No
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Go to the symptom troubleshooting “NO.17 COOLING SYSTEM CONCERNS-OVERHEATING”.
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2
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Connect the M-MDS to the DLC-2.
Perform the PID/DATA Monitor and Record Procedure and access the following PIDs:
• IAT
• MAF
• SPARKADV
Are the PIDs normal?
(See PCM INSPECTION [ZJ, ZY].)
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Yes
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Go to the next step.
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No
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IAT:
• Inspect the IAT sensor.
MAF:
• Inspect the MAF sensor.
SPARKADV:
• Inspect the CMP sensor and the KS.
Repair or replace the malfunctioning part according to the inspection results.
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3
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Connect the M-MDS to the DLC-2.
Perform the KOEO/KOER self test.
(See KOEO/KOER SELF TEST [ZJ, ZY].)
Are any continuous memory DTCs present?
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Yes
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Go to the appropriate DTC inspection.
(See DTC TABLE [ZJ, ZY].)
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No
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Go to the next step.
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4
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Inspect the engine compression.
Is there any malfunction?
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Yes
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Go to the next step.
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No
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Inspect for cause.
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5
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Install the fuel pressure gauge between the fuel pipe and the fuel distributor.
Start the engine and idle it.
Measure the fuel line pressure during idle.
Is the fuel line pressure correct during idle?
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Yes
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Inspect the ignition timing.
Repair or replace the malfunctioning part according to the inspection results.
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No
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Low:
• Inspect the fuel line for clogging.
High:
• Replace the fuel pump unit.
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6
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Verify test results.
• If normal, return to diagnostic index to service any additional symptoms.
• If malfunction remains, inspect related Service information perform repair or diagnosis.
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