AD83.70-W-6000-37C | AHE test of electrical system flame monitor open circuit |
| Scope of test | Measuring instrument/ Test connection | Operation/Requirement | Specified value | Possible cause/Remedy | ||
1.0 | Flame sensor –//– Cables, Internal resistance |
14/8 | G |
14/9 | Ignition: OFF Heater unit: OFF Open flap on air recirculation box. Disconnect 14-pin plug connection on vehicle blower. | 700–1300 Ω (at approx. | Value in order: 1.2 Value > 30 kΩ: 1.1 |
1.1 | Flame sensor –//– Internal resistance |
12/7 | Heater unit |
12/9 | Ignition: OFF Heater unit: OFF Allow engine and heater unit to cool down. Remove cover in front right wheel housing and remove heater unit. Disconnect plug connection on heater unit. | 700–1300 Ω (at approx. | Value in order: Check ground connection (pin 12/7 to 12/8) on connection plug to heater unit, repair if open-circuit. Cable / plug connection from air recirculation box to heater unit (open-circuit). Value > 30 kΩ: Replace flame sensor on trial. |
1.2 | Flame sensor –//– Cable harness, control unit |
A5 | Z13 |
A4 | Ignition: OFF Heater unit: OFF Re-connect 14-pin plug connection G on vehicle blower. Disconnect 13-pin plug A on control unit. | 700–1300 Ω (at approx. | Value in order: Replace control unit (Z13) on trial. Value > 30 kΩ: Cables / plug connections from air recirculation box to control unit (open-circuit). If cables / plugs are in order but fault code still re-appears, check cable to control unit for cable-short or short-circuit to positive cable. |