AD83.70-W-3000A | Auxiliary heater (AHE) diagnosis, function check | 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 | |||
Diagnosis procedure | |||
a | Battery voltage 22.5 to 29.5 V. | ||
b | Electrical system checked according to vehicle operating instructions and OK | ||
Function check | |||
Test step | Action/prerequisite | Nominal value | Remarks |
1 Blower | Auxiliary heater: ON or HHT connected Actuate blower. | Blower noise | No blower noise: |
2 Hot water heater combustion air blower and water pump | Auxiliary heater: ON | Combustion air blower and water pump start running | Combustion air blower or water pump do not start running: |
3 Hot air heater burner | Auxiliary heater: ON On hot water auxiliary heater also: | Hot air exits after approx. 2 min | No hot air exiting after approx. 2 min: |
4 Fuel metering pump | Ignition: ON Connect HHT. Actuate fuel metering pump (pour line full). | Cycling noise from fuel metering pump | No cycling noise |
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