AD83.70-W-3002A | Auxiliary heater, diagnosis, function check using binary values | 16.7.97 |
MODEL 950, 952, 953, 954
with CODE (H60) "Eberspächer" D1 LP hot air auxiliary heater
with CODE (H61) "Webasto" Air Top 2000 hot air auxiliary heater
with CODE (H62) "Eberspächer" D3 LP hot air auxiliary heater
with CODE (H64) "Eberspächer" D9W hot water auxiliary heater
with CODE (H65) "Webasto"Thermo Top 90 hot water auxiliary heater
| Auxiliary heater (ZHE), location of components | ||
Auxiliary heater (ZHE) diagnosis, basic knowledge | |||
Notes on reading out actual values (readings and binary values) | |||
Diagnosis procedure | |||
| The binary value BW04 is not used presently. It is provided only for future development and is not always present. | ||
a | Battery voltage 22.5 to 29.5 V. | ||
b | Electrical system checked according to vehicle operating instructions and OK | ||
Function check | |||
Actual value, meaning | Action/prerequisite | Nominal value | Remarks |
BW01 Bits 7 and 6 Flame sensor It is indicated whether the flame sensor is operating properly. | Ignition: ON Additional heater: ON | 00 = Malfunction 01 = No malfunction 11 = not present | Display example: Z H E B W 0 1 00 00 01 01 Troubleshooting according to diagnosis procedure schematic: |
BW01 Bits 5 and 4 Generator signal (D+) It is indicated whether D+ is present. | Ignition: ON Additional heater: ON | 00 = Signal present 01 = Signal not present 11 = not present | Display example: Z H E B W 0 1 00 00 01 01 Troubleshooting according to diagnosis procedure schematic: |
BW01 Bits 3 and 2 Power take-off It is indicated whether the power take-off is in operation. | Ignition: ON Additional heater: ON | 00 = PTO not in operation 01 = PTO in operation 11 = not present | Display example: Z H E B W 0 1 00 00 01 01 Troubleshooting according to diagnosis procedure schematic: |
BW01 Bits 1 and 0 Switch-on signal It is indicated whether the heater is switched on. | Ignition: ON Additional heater: ON | 00 = OFF 01 = ON 11 = not present | Display example: Z H E B W 0 1 00 00 01 01 Troubleshooting according to diagnosis procedure schematic: |
BW02 Bits 7 and 6 Water pump It is indicated whether the water pump is operating. | Ignition: ON Additional heater: ON | 00 = Water pump not running 01 = Water pump running | Display example: Z H E B W 0 2 00 00 01 01 Troubleshooting according to diagnosis procedure schematic: |
BW02 Bits 5 and 4 Blower It is indicated whether the blower is operating. | Ignition: ON Additional heater: ON | 00 = Blower not running 01 = Blower running | Display example: Z H E B W 0 2 00 01 01 01 Troubleshooting according to diagnosis procedure schematic: |
BW02 Bits 3 and 2 Glow plug It is indicated whether the glow plug is actuated. | Ignition: ON Additional heater: ON | 00 = Glow plug not actuated 01 = Glow plug actuated | Display example: Z H E B W 0 2 00 00 01 01 Troubleshooting according to diagnosis procedure schematic: |
BW02 Bits 1 and 0 Fuel metering pump It is indicated whether the fuel metering pump is operating. | Ignition: ON Additional heater: ON | 00 = Fuel metering pump not running 01 = Pure metering pump running | Display example: Z H E B W 0 2 00 00 01 01 Troubleshooting according to diagnosis procedure schematic: |
BW03 Bits 7 and 6 Water pump external actuation It is indicated whether an external actuation is present for the water pump. | Ignition: ON Additional heater: ON | 00 = not present 01 = present 11 = not present | Display example: Z H E B W 0 3 00 00 01 01 Troubleshooting according to diagnosis procedure schematic: |
BW03 Bits 5 and 4 24 V / 12 V It is indicated whether the operating voltage is 24 V or 12 V. | Ignition: ON Additional heater: ON | 00 = 12 V 01 = 24 V 11 = not present | Display example: Z H E B W 0 3 00 01 01 01 |
BW03 Bits 3 and 2 Diesel / gasoline It is indicated whether the auxiliary heater is designed for operation with diesel fuel or gasoline. | Ignition: ON Additional heater: ON | 00 = Gasoline 01 = Diesel 11 = not present | Display example: Z H E B W 0 3 00 00 01 01 Troubleshooting according to diagnosis procedure schematic: |
BW03 Bits 1 and 0 GGVS operation It is indicated whether the vehicle is provided for GGVS operation. | Ignition: ON Additional heater: ON | 00 = No GGVS operation 01 = GGVS operation 11 = not present | Display example: Z H E B W 0 3 00 00 01 01 Troubleshooting according to diagnosis procedure schematic: |
BW04 Bits 7 and 6 Economy mode | Ignition: ON Additional heater: ON | 00 = not present 01 = present 11 = not present | Display example: Z H E B W 0 4 00 00 01 01 Troubleshooting according to diagnosis procedure schematic: |
BW04 Bits 5 and 4 Nozzle holder heater | Ignition: ON Additional heater: ON | 00 = 12 V 01 = 24 V 11 = not present | Display example: Z H E B W 0 4 00 01 01 01 |
BW04 Bits 3 and 2 Vehicle blower operation | Ignition: ON Additional heater: ON | 00 = Gasoline 01 = Diesel 11 = not present | Display example: Z H E B W 0 4 00 00 01 01 Troubleshooting according to diagnosis procedure schematic: |
BW04 Bits 1 and 0 Operation display | Ignition: ON Additional heater: ON | 00 = No GGVS operation 01 = GGVS operation 11 = not present | Display example: Z H E B W 0 4 00 00 01 01 Troubleshooting according to diagnosis procedure schematic: |