Pic. 7-39. Device switching scheme: 1 - oil pressure indicator with an insufficient pressure warning lamp; 2 - fuel gauge with fuel reserve control lamp; 3 - control lamp of the parking brake; 4 - tachometer; 5 - control lamp of the air damper of the carburetor; 6 - coolant temperature gauge; 7 - a control lamp of level of a brake liquid; 8 - a control lamp of blocking of differential; 9 - generator; 10 - battery; 11 - ignition switch; 12 - fuse box; 13 - switch of a control lamp of blocking of differential; 14 - sensor of insufficient level of brake fluid; 15 - coolant temperature indicator sensor; 16 - switch for the control lamp of the carburetor air damper; 17 - ignition coil; 18 - switch of the parking brake warning lamp; 19 - relay-breaker of the parking brake warning lamp, 20 - sensor for level indicator and fuel reserve; 21 - oil pressure indicator sensor; 22 - oil pressure warning lamp sensor
Coolant temperature gauge
If the pointer needle is constantly at the beginning of the scale, then with the ignition on, disconnect the wire from the pointer sensor and connect the wire tip to «weight».
If the arrow deviates, then, therefore, the sensor is faulty and must be replaced. If the arrow does not deviate, then remove the instrument panel and, with the ignition on, connect to «weight» plug «V» pointer. The deviation of the arrow in this case will indicate the serviceability of the device and the damage to the wire connecting the sensor to the pointer. If the arrow does not deviate, then replace the device.
If the pointer needle is constantly in the red zone, then with the clamping on, disconnect the wire from the sensor. If the sensor is faulty, the arrow should return to the mark «50».
If the arrow remains in the red zone, then either the wire has a short circuit with «weight», or the instrument is damaged. The serviceability of the device can be checked by disconnecting the green wire going to the sensor from the pointer. With the ignition on, the arrow should return to the mark «50».
Fuel gauge
The verification procedure is similar to that described above. In this case, it must be borne in mind that the plug «W» the pointer sensor is connected to the wire that goes to the fuel reserve control lamp, and to the plug «T» — provo; j going to the pointer itself.
If the pointer needle is constantly at the beginning of the scale and does not deviate after closing with «weight» wire end disconnected from the plug «T» sensor, it is necessary to check the device. To do this, remove the instrument panel and, with the ignition on, connect to «weight» plug «S» pointer. With a working device, the arrow should deviate to the end of the scale.
If the pointer arrow is constantly against the 4/4 mark, then the serviceability of the device can be checked by disconnecting the pink wire from the pointer (to the plug «T» sensor). In this case, for a serviceable device with the ignition on, the arrow should be against the mark «0».
Oil pressure gauge
The verification procedure is similar to that described above. When troubleshooting, connect to «weight» plug «HN» pointer or disconnect from it a gray wire with black stripes going to the sensor.