AD83.70-W-6000-24A | AHE test of electrical system combustion air blower short to ground |
| Scope of test | Measuring instrument/ Test connection | Operation/Requirement | Specified value | Possible cause/Remedy | ||
1.0 | Combustion air blower Supply cable |
A3 | Z14 |
A4 | Ignition: OFF Heater unit: OFF (Run-on must have ended) Disconnect plug connection A on control unit. Carry out measurement at connection plug A. | Value < 5 Ω: Combustion air blower Cable harness to heater unit (cable-short) 1.1 Value > 8 Ω: Short-circuit to positive cable in cable harness from control unit (Z14) to air recirculation box. Control unit (Z14) 1.3 | |
1.1 | Combustion air blower |
A3 | Z14 |
A4 | Ignition: OFF Remove heater unit (take care not to disconnect coolant circulation), if necessary refer to Danger! Risk of injury and of scalding with high coolant temperature! Disconnect plug connection on heater unit. Carry out measurement at plug connection A to control unit. | Value > 30 kΩ: Replace combustion air blower complete with supply cable and plug X6. Plug carrier on heater unit Value < 5 Ω: Cable harness to heater unit If no fault can be determined: 1.2 | |
1.2 | Combustion air blower Supply cable |
A3 | Z14 |
A4 | Ignition: OFF Heater unit: OFF Disconnect plug connection FF8 (under electrical compartment). Carry out measurement at connection plug A to control unit (Z14). | Value < 5 Ω: Install cable harness ( ) from control unit (Z14) to electrical compartment, fit new cable (use 1.5 mm2, lilac/brown). Value > 30 kΩ: Cable harness ( ) from electrical compartment to air recirculation box. | |
1.3 | Combustion air blower Voltage supply |
A1 | Z14 |
A4 | Ignition: OFF Heater unit: OFF Carry out measurement at connection plug A to control unit (Z14). Ignition: ON | Value < 1 V: Replace control unit (Z14) on trial. Value 22.529.5 V: Cable-short or short-circuit on cable to positive cable from control unit (Z14) to heater unit. | |
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