#
WATER HEATER SYSTEM ON-BOARD DIAGNOSTIC FUNCTION

BME070200000T01

## Outline

• The CPU determines that there is a malfunction, and outputs a signal as a DTC to the DLC-2.
• Using an SST (WDS or equivalent), DTCs can be displayed and deleted.

## DTC Table

DTC | Possible cause
--- | ---
B1317 | Input voltage high
B1318 | Input voltage low
B1342 | Malfunction in water heater unit
B2449 | Glow plug circuit short to ground
B2450 | Glow plug circuit open
B2451 | Fuel pump circuit short to ground
B2452 | Fuel pump circuit open
B2453 | Blower fan circuit short to ground
B2454 | Blower fan circuit open
B2463 | Overheat
B2537 | Water heater system does not start
B2538 | Unstable flame
B2547 | Flame prior to operation
B2548 | Water heater lockout mode

  * :
If a DTC not listed above is detected, there is a water heater malfunction, and the water heater must be replaced.