F0:DATA LIST
No.
| TECH 1 Display |
|---|
| Conditions for Checking |
| Nominal Value |
| Trouble Codes |
| Terminal |
| 25 |
| 02 SENSOR LOOP |
Ignition ON, engine cold
Engine running at idle speed, operating temperature
| Accelerate fully |
OPEN
CLOSED
OPEN
| 13, 38, 39 |
|---|
| INTERN. |
| 26 |
| 02 SENSOR |
Ignition ON, engine cold
Engine running at idle speed, operating temperature
Switch off all consumers
40 to 460 mV
constant value
40 to 1000 mV
| alternating value |
|---|
| 13, 38, 39 |
| 28/10 |
Notes for Trouble-shooting:
· Ignition ON
· Remove oxygen sensor wiring harness plug
· Measure voltage between oxygen sensor plug P32/Ter. C and Ter. A on control unit side using multimeter and Adapter Cable KM-609-1 5 from Electronic-Kit I KM-609
Nominal Value:
| 0.4 to 0.5 V |
Cause of Fault:
· Interruption or short circuit from
- Control unit K61/Ter.28 to oxygen sensor P32/Ter. C
- Control unit K61/Ter.10 to ground
| - Oxygen sensor P32/Ter.A to ground |
Continued
· Adapt multimeter with Adapter Lead KM-609-1 4 and KM-609-1 5 from Electronic-Kit I KM-609 to oxygen sensor plug connection
· Allow engine to run at 1200 to 1600 rpm with coolant temperature 85 °C/185 °F
| · Measure voltage at Ter. C to Ter. A with engine running |
Voltage change between
| 0.1 and 0.9 V |
· If loop closes only very slowly:
- Oxygen sensor heating defective
- Lead interruption from K68ITer.4 to oxygen sensor P32/Ter. B
- Lead interruption from oxygen sensor P32/Ter. A to ground
· Oxygen sensor P32 defective
· Mixture constantly too rich (see test step 27)
· Mixture constantly too lean (see test step 27)
· Control unit K61 defective
| · Measure voltage at Ter. B to Ter. A |
|---|
| 11.5 to 13.5 V |
· Oxygen sensor heating defective
· Lead interruption from
- K68/Ter.4 to oxygen sensor P32/Ter.B
- Oxygen sensor P32/Ter.A to ground