AD83.70-W-6000-10C | Auxiliary heater (AHE) test of electrical system fuel metering pump |
| Scope of test | Measuring instrument/ Test connection | Operation/Requirement | Specified value | Possible cause/Remedy | ||
1.0 | Fuel metering pump (M16) Internal resistance |
a | M16 |
b | Ignition: OFF Heater unit: OFF Disconnect plug connection on metering pump. Carry out measurement directly on plug connection to metering pump (in front right vehicle longitudinal frame). | 35–45 Ω (at approx. | Value in order: 1.1 Value < 5 Ω: Replace metering pump (M16) on trial. |
1.1 | Fuel metering pump (M16) Cable harness |
12/2 () | Heater unit |
12/12 | Ignition: OFF Heater unit: OFF Metering pump (M16) not connected. Remove cover in right front wheel housing and disconnect plug connection on heater unit. Connect measuring instrument. Ignition: ON | Value > 20 V: Cable to metering pump (cable-short or short-circuit to positive cable). Value approx. 0 V: 1.2 | |
1.2 | Fuel metering pump (M16) Cable harness |
|
| Z13 A10 | Ignition: OFF Heater unit: OFF Disconnect 13-pin plug connection A on control unit. Connect measuring instrument. Ignition: ON | Value > 20 V: Cable to heater unit (cable-short or short-circuit to positive cable). Value approx. 0 V: Replace control unit (Z13) on trial. | |