Diagnostic procedure
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STEP
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INSPECTION
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ACTION
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|---|---|---|---|
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1
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INSPECT WIRING HARNESS BETWEEN WATER HEATER UNIT AND FUEL PUMP (WATER HEATER SYSTEM) FOR CONTINUITY
• Start engine.
• Is voltage at fuel pump (water heater system) connector terminal A approx. 12 V?
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Yes
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Go to next step
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No
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Repair wiring harness.
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2
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INSPECT FUEL PUMP (WATER HEATER SYSTEM)
• Inspect fuel pump (water heater system).
• Is fuel pump (water heater system) okay?
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Yes
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Go to next step
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No
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Replace fuel pump (water heater system).
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3
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INSPECT WIRING HARNESS BETWEEN FUEL PUMP (WATER HEATER SYSTEM) AND GROUND FOR CONTINUITY
• Is there continuity fuel pump (water heater system) connector terminal B and ground?
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Yes
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Go to next step
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No
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Repair wiring harness.
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4
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INSPECT WATER HEATER UNIT
• Clear the DTC.
• Perform the KOEO Self Test. (SeeKOEO Self Test/Combustion Test.)
• Is the same DTC present?
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Yes
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Replace the water heater unit.
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No
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Go to the next step.
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5
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VERIFY AFTER REPAIR PROCEDURE
• Perform after repair procedure. (SeeAfter Repair Procedure.)
• Are any DTCs present?
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Yes
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Go to the applicable DTC troubleshooting.
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No
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Troubleshooting completed.
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