Inside temperature sensor - short circuit to B+/short circuit to ground: Diagnosis/troubleshooting
DIAGNOSIS/TROUBLESHOOTING (FAULT CODE 22, AS OF MY 2002)
| Work instruction | Display OK | If not OK | ||
|---|---|---|---|---|
| 1 | Read out air-conditioning system fault memory | Only display fault code 22 entered Step 2 |
Fault code 22 and fault code 21/23/26/27/28/29 entered Step 7 |
|
| 2 | Checking inside temperature sensor |
|
Approx. 1.2 k (at 23 °C)
Step 3
Step 4 |
Step 5
Step 6 |
| 3 | Check leads between air-conditioning system regulator and inside temperature sensor for short circuit to B+ |
|
< 0.3V Step 10 |
Repair wiring harness ->End |
| 4 | Check lead between air-conditioning system regulator and inside temperature sensor for short circuit to ground |
|
Step 10 | Repair wiring harness ->End |
| 5 | Check leads between air-conditioning system regulator and inside temperature sensor for short circuit between one another |
|
Step 9 | Repair wiring harness ->End |
| 6 | Check wiring between air-conditioning system regulator and inside temperature sensor for open circuit |
|
< 5 Step 9 |
Repair wiring harness ->End |
| 7 | Check sensor ground for open circuit |
|
If all values are O.k. (see below) Step 8 |
Repair the respective wiring harness ->End |
|
Approx. 1.2 k(at 23 °C) | |||
|
Approx. 2.8 k (at 23 °C) | |||
|
Approx. 3.0 k(at 23 °C) | |||
|
Plausible value between 0.3 k and 1.6 k (dependent on the position of the respective flap) |
|||
| 8 | Check sensor ground for short circuit to B+ |
|
< 0.3V Step 10 |
Repair wiring harness ->End |
| 9 |
|
->End | ||
| 10 |
|
->End | ||