AD83.70-W-6000-35C | AHE test of electrical system auxiliary heater control module |
| Scope of test | Measuring instrument/ Test connection | Operation/Requirement | Specified value | Possible cause/Remedy | ||
1.0 | Auxiliary heater control unit (Z13) Cables | - | Ignition: OFF Heater unit: OFF Replace fuse F1. Switch over cab heating / engine heating switch. Heater unit: ON | If fuse trips again: 1.1 If fuse does not trip: Supply cable to relay K1 on heater unit mount (short-circuit to ground). Supply cable to coolant circulation solenoid valve (Y61). Short-circuit to ground on coolant circulation solenoid valve (Y61). | |||
1.1 | Auxiliary heater control unit (Z13) Plug connection | - | Ignition: OFF Heater unit: OFF Replace fuse F1. Disconnect 13-pin plug connection B on control unit. Heater unit: ON | If fuse does not trip: Replace control unit (Z13) on trial (short-circuit to ground). If fuse trips again: 1.2 | |||
1.2 | Auxiliary heater control unit (Z13) H module | - | Ignition: OFF Heater unit: OFF Replace fuse F1. Disconnect plug connection III on H module. Heater unit: ON | If fuse trips again If fuse does not trip: Replace H module on trial. | |||