DTC B1005, B1006, B2451, B2452 [WATER HEATER SYSTEM]

id070228815200

DTC

B1005

Fuel pump (water heater system) malfunction: short to battery or transistor failure

B1006

Fuel level to low to start the heater

B2451

Fuel pump (water heater system) circuit short to ground

B2452

Fuel pump (water heater system) circuit open
DETECTION CONDITION
•  CPU detects malfunction in fuel pump (water heater system) circuit
POSSIBLE CAUSE
•  Fuel pump (water heater system) malfunction
•  Water heater unit malfunction
•  Short to ground between water heater unit terminal B and fuel pump (water heater system) terminal A
•  Open circuit between water heater unit terminal B and fuel pump (water heater system) terminal A
•  Open circuit between fuel pump (water heater system) terminal B and GND
•  Battery malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION
1
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?
Yes
Go to the next step.
No
Repair wiring harness.
2
INSPECT FUEL PUMP (WATER HEATER SYSTEM)
•  Inspect fuel pump (water heater system).
•  Is fuel pump (water heater system) okay?
Yes
Go to the next step.
No
Replace fuel pump (water heater system).
(See FUEL PUMP (WATER HEATER SYSTEM) REMOVAL/INSTALLATION [MZR-CD (RF Turbo)].)
3
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?
Yes
Go to the next step.
No
Repair wiring harness.
4
INSPECT WATER HEATER UNIT
•  Clear the DTC. (See CLEARING DTC [WATER HEATER SYSTEM].)
•  Perform the KOEO Self Test.(See DTC DISPLAY [WATER HEATER SYSTEM].)
•  Is the same DTC present?
Yes
Replace the water heater unit.
(See WATER HEATER UNIT REMOVAL/INSTALLATION [MZR-CD (RF Turbo)].)
No
Go to the next step.
5
VERIFY AFTER REPAIR PROCEDURE
•  Perform after repair procedure. (See CLEARING DTC [WATER HEATER SYSTEM].)
•  Are any DTCs present?
Yes
Go to the applicable DTC troubleshooting.
No
Troubleshooting completed.