Checking Program - Electrical Circuit EGR
| Test | Test Equipment | Test | Notes | Nominal | ||
|---|---|---|---|---|---|---|
| Step | Multimeter | |||||
| MKM - 587 - A | of | between | Value | |||
| 05 | Frequention meter | Engine speed sensor P74 | K161, ter. 15 | K161, ter. 14 | · Engine idling | ± 250 Hz |
| · Engine at approx. 3500 rpm | ||||||
| · Measurement at wiring harness plug | ± 1000 Hz | |||||
| Troubleshooting: | Nominal Value: | Cause of Fault: | ||||
| · Disconnect wiring harness connector from engine speed sensor P74 |
· Measure resistance with multimeter
from: Control unit QOS & EGR K161, wiring harness plug ter. 15
| to: Engine speed sensor P74, wiring harness plug ter. 2 | approx. 0 W | · Line interrupted or short circuit to voltage |
from: Control unit QOS & EGR K161, wiring harness plug ter. 15
to: Engine speed sensor P74, wiring harness plug ter. 2
· Measure resistance with multimeter
from: Control unit QOS & EGR K161, wiring harness plug ter. 15
| to: Ground | > 200 kW | · Short circuit to ground |
from: Control unit QOS & EGR K161, wiring harness plug ter. 15
to: Engine speed sensor P74, wiring harness plug ter. 2
· Measure resistance with multimeter
from: Control unit QOS & EGR K161, wiring harness plug ter. 14
| to: Engine speed sensor P74, wiring harness plug ter. 1 | approx. 0 W | · Line interrupted or short circuit to voltage |
from: Control unit QOS & EGR K161, wiring harness plug ter. 14
to: Engine speed sensor P74, wiring harness plug ter. 1
· Measure resistance with multimeter
from: Control unit QOS & EGR K161, wiring harness plug ter. 14
| to: Ground | approx. 0 W | · Line interrupted |
from: Control unit QOS & EGR K161, wiring harness plug ter. 14
to: Ground
| If nominal values are attained: | · Engine speed sensor P74 defective |