Checking Program QOS - III
| Test | Test Equipment | Test | Notes | Nominal | ||
|---|---|---|---|---|---|---|
| Step | Multimeter | |||||
| MKM - 587 - A | ||||||
| of | ||||||
| between | Value | |||||
| 04 | Ohmmeter range 20 MW | Coolant temperature Sensor P55 | K76, ter. 4 | K76, ter. 8 | · Ignition "ON" |
· Coolant temperature 20 °C / 68 °F
· Coolant temperature 80 °C / 176 °F
· Measurements at wiring harness plug
Note:
| A detailed check of the function of the coolant temperature sensor P55 is given in section 4.3 | ± 2.0 kW | |||||
|---|---|---|---|---|---|---|
| ± 0.3 kW | ||||||
| K76, ter. 4 | Ground | · Measurements at wiring harness plug | > 20 MW | |||
| Troubleshooting: | Nominal Value: | Cause of Fault: |
· Disconnect wiring harness plug from coolant temperature sensor P55
· Measure resistance with multimeter
from: Control unit QOS - III K76, wiring harness plug ter. 4
| to: Coolant temperature sensor P55, wiring harness plug ter. 2 | approx. 0 W | · Line interrupted or short circuit to voltage |
from: Control unit QOS - III K76, wiring harness plug ter. 4
to: Coolant temperature sensor P55, wiring harness plug ter. 2
· Measure resistance with multimeter
from: Control unit QOS - III K76, wiring harness plug ter. 4
| to: Ground | > 20 MW | · Short circuit to ground |
from: Control unit QOS - III K76, wiring harness plug ter. 4
to: Coolant temperature sensor P55, wiring harness plug ter. 2
· Measure resistance with multimeter
from: Control unit QOS - III K76, wiring harness plug ter. 8
| to: Coolant temperature sensor P55, wiring harness plug ter. 1 | approx. 0 W | · Line interrupted or short circuit to voltage |
from: Control unit QOS - III K76, wiring harness plug ter. 8
to: Coolant temperature sensor P55, wiring harness plug ter. 1
· Measure resistance with multimeter
from: Control unit QOS - III K76, wiring harness plug ter. 8
| to: Ground | > 20 MW | · Short circuit to ground |
from: Control unit QOS - III K76, wiring harness plug ter. 8
to: Coolant temperature sensor P55, wiring harness plug ter. 1
| If nominal values are attained: | · Coolant temperature sensor P55 defective |