ON-BOARD DIAGNOSTIC FUNCTION [WATER HEATER SYSTEM]

id070228100300


Memory Function

•  Stores the signal determined to be malfunctioning by the malfunction detection function, and the memory is not cleared even if the ignition switch is turned off (LOCK position) or the malfunction has been repaired.
•  Clear stored malfunction data by connecting the Mazda Modular Diagnostic System (M-MDS) to the DLC-2.

Display Function

•  This function is for outputting present or past malfunctions via the DLC-2 as DTCs.
•  DTCs output via the DLC-2 can be read out using the Mazda Modular Diagnostic System (M-MDS).
Malfunction Display Mode
•  Present and past malfunctions in the control system circuits (open/short circuits) are detected, and the DTCs indicated in the table are displayed on the Mazda Modular Diagnostic System (M-MDS). Since once a past malfunction is stored, it will remain stored even after the malfunction has been repaired, clear past malfunctions after completing repairs.
•  Clear stored past malfunctions by connecting the Mazda Modular Diagnostic System (M-MDS) to the DLC-2.

DTC Table

DTC

System malfunction location
B1004
Glow plug malfunction: short to battery or transistor failure
B1005
Fuel pump (water heater system) malfunction: short to battery or transistor failure
B1006
Fuel level to low to start the heater
B1008
Blower fan malfunction: short to battery
B1317
Input voltage high
B1318
Input voltage low
B1342
Malfunction in water heater unit
B2207
Water heater unit ROM checksum error
B2449
Glow plug circuit short to ground
B2450
Glow plug circuit open
B2451
Fuel pump (water heater system) circuit short to ground
B2452
Fuel pump (water heater system) circuit open
B2453
Blower fan circuit short to ground
B2454
Blower fan circuit open
B2455
Blower fan out of range (electromotive force not present)
B2456
Coolant sensor short
B2457
Coolant sensor interrupted
B2458
Overheat sensor short
B2459
Overheat sensor interrupted
B2460
Flame sensor short
B2461
Flame sensor interrupted
B2462
•  Flame off from max. power
•  Flame off from min. power
B2463
Overheat
B2464
Start time exceeded
B2465
Start counter overrun/system locked
B2466
Overheat counter overrun/system locked
B2467
Aux. heater cool down time exceeded
U1900
CAN Communication Bus Fault - Receive Error
U2516
CAN bus off - Transmit Error


PID/DATA MONITOR FUNCTION

•  Use the Mazda Modular Diagnostic System (M-MDS) to read the PID/data monitor.

PID Table

PID Name (Definition)

Unit/Condition

Condition/Specification (Reference)

Action

Water Heater Unit terminal
CCNTFFH
(Continuous Codes)
-
•  DTC is detected: 1-255
•  DTC is not detected: 0
Perform inspection using appropriate DTC.
-
VOLT_MDL
(Water heater unit Voltage)
V
•  Ignition switch ON: B+
Inspect water heater unit power supply terminal.
A
HEATER
(Heater Status)
On/Off
•  Water heater unit is not operating: Off
•  Water heater unit is operating: On
-
-
FAN
(Fan Control)
On/Off
•  Blower fan is not operating: 0%
•  Blower fan is operating: 0-100%
-
-
GLOW
(Glowplug)
On/Off
•  Glow plug is not operating: Off
•  Glow plug is operating: On
-
-
FUEL_PMP
(Fuel pump)
On/Off
•  Fuel pump (water heater unit) is not operating: Off
•  Fuel pump (water heater unit) is operating: On
-
-
PREFILL
(Water heater unit Lock/Unlock Status After Prefilling)
Lock/Unlock
•  Water heater unit is not operating: Lock
•  Water heater unit is operating: Unlock
-
-