NO.3 SMOKE FROM WATER HEATER UNIT [WATER HEATER SYSTEM]
id0703d1804000
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3
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Smoke from water heater unit
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DESCRIPTION
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• Smoke or odor is emitted during water heater unit operation.
• Smoke or odor is emitted right after water heater unit starts operation.
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POSSIBLE CAUSE
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• PME fuel was used (not a water heater system malfunction)
• The water heater system had not been operated for a long period and deteriorated fuel in water heater unit or fuel line was combusted (not a water heater system malfunction)
• Normal combustion cannot be performed (abnormal combustion)
• Intake system (air intake hose or water heater silencer) malfunction
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Diagnostic procedure
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STEP |
INSPECTION |
ACTION |
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1
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DETERMINE IF MALFUNCTION CAUSE IS FUEL RELATED
• Verify what kind of fuel the customer used.
• Was PME fuel used?
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Yes
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Explain to the customer that emission of smoke and odor increases if PME is used.
If emission of smoke and odor is higher than other vehicles which use the same fuel, go to the next step.
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No
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Go to the next step.
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2
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DETERMINE IF MALFUNCTION CAUSE IS LONG-TERM NON USE OF WATER HEATER UNIT
• Perform “FFH Start Heater Utility” a few times using M-MDS.
• Does emission of smoke and odor decrease?
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Yes
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Explain to the customer that the symptom was caused because the water heater system had not been operated for a long period and deteriorated fuel in water heater unit or fuel line was combusted.
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No
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Go to the next step.
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3
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INSPECT WATER HEATER UNIT CONNECTOR CONDITION
• Inspect the connector condition of the water heater unit.
• Is the connector connected correctly?
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Yes
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Go to the next step.
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No
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Repair or replace the malfunctioning part.
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4
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INSPECT WATER HEATER UNIT AIR INTAKE SYSTEM PIPE
• Inspect the water heater unit air intake system pipe for clogging or deformation.
• Is any clogging or deformation found?
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Yes
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Replace the malfunctioning part.
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No
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Go to the next step.
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5
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INSPECT WATER HEATER UNIT EXHAUST SYSTEM
• Remove the exhaust pipe of the water heater unit.
• Inspect the water heater unit exhaust pipe for clogging.
• Is the pipe clogged?
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Yes
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Replace the exhaust pipe.
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No
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Replace the water heater unit.
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