U–26
TROUBLESHOOTING
FOREWORD
A6E858001038201
• Confirm the symptom using the following troubleshooting index and carry out the appropriate action.
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TROUBLESHOOTING INDEX
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TROUBLESHOOTING
No. TROUBLESHOOTING ITEM ACTION
1 Fuel odor • Inspect the water heater system in the vehicle fuel
system.
• Inspect the fuel line for leakage, kinks, or blockage.
• If normal, there is an internal water heater leak.
— Replace the water heater unit.
2 The heater does not achieve full load operation • Replace the water heater unit.
3 Continuous white smoke during combustion operation • Replace the water heater unit.
4 Loss of coolant (leakage). Heater develops smoke during
combustion operation; smell of exhaust fumes extremely
sweet
• Inspect the coolant hose for leakage, kinks,
looseness, and loose hose clamps.
• If normal, there is an internal water heater leak.
— Replace the water heater unit.
5 Loss of fuel (leakage) • Inspect the water heater system integration in the
vehicle’s fuel system.
• Inspect the fuel line connections for leakage.
• If normal, there is an internal water heater leak.
— Replace the water heater unit.
6 The water heater unit does not communicate with the SST
(WDS or equivalent)
• Refer to section T, ON-BOARD DIAGNOSTIC
[MULTIPLEX COMMUNICATION SYSTEM].
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