Multec - S (C 16 XE) F0: DATA LIST
| No. | TECH 1 Display | Conditions for Checking | Nominal Value | Trouble Codes | Terminal |
|---|---|---|---|---|---|
| 10 | O2 SENSOR | Ignition ON | 13,44,45 | F 5 / F 9 | |
| Engine cold | 350 to 550 mV | ||||
| Engine running at idle speed, at operating temperature | 50 to 950 mV |
alternating
| Trouble - shooting: | Nominal Value: | Cause of Fault: |
(If nominal value is not attained)
Part 1
· Disconnect wiring harness plug from oxygen sensor P 32
· Measure voltage:
from: wiring harness plug P 32, wiring harness side Ter. C
to: ground
| · Ignition ON | 450 mV ± 20 mV | · Lead interruption |
from: wiring harness plug P 32
to: control unit K 57 Ter. F 5
· Short circuit in wiring harness
from: control unit K 57 Ter. F 5
to: ground
(with display less than 100 mV)
· Lead interruption
from: control unit K 57 Ter. F 9
to: ground (with display 800 to 1000 mV)
· Short circuit in wiring harness
from: control unit K 57 Ter. F 9
to: battery + (with display greater than 1000 mV)
· Control unit defective
· Engine in TECH 1 mode "F6", submode "F0".
Using arrow keys, set to 1300 rpm.
· Measure voltage:
from: oxygen sensor plug P 32 Ter. C
to: ground
(oxygen sensor plug disconnected)
| 50 to 950 mV | · Oxygen sensor defective | |
|---|---|---|
| · Accelerate | with acceleration greater than 700 mV | · Mixture constantly too lean / rich |
(see next page but one)
· Ignition OFF
· Disconnect fuel pump relay K 58, bridge Ter. 2
and Ter. 8
· Ignition ON
· Measure voltage:
from: relay socket K 58 Ter. 2
to: ground
| greater than 11 V | · Wiring harness defective | |
|---|---|---|
| (see test step 26) |
· Measure voltage:
from: oxygen sensor plug P 32 Ter. A
| to: ground | greater than 11 V | · Lead interruption |
from: oxygen sensor plug P 32 Ter. A
to: relay socket K 58 Ter. 8
· Short circuit in wiring harness
from: oxygen sensor plug P 32 Ter. A
to: ground
· Measure voltage:
from: oxygen sensor plug P 32 Ter. A
| to: oxygen sensor plug P 32 Ter. B | greater than 11 V | · Short circuit in wiring harness |
from: oxygen sensor plug P 32 Ter. A
to: oxygen sensor plug P 32 Ter. B
· Lead interruption
from: oxygen sensor plug P 32 Ter. B
to: ground
· Measure voltage:
from: shielding
| to: ground | less than 0.1 V | · Short circuit in wiring harness |
from: shielding
to: battery +
· Ignition OFF
Using Multimeter, measure resistance:
from: shielding
to: ground
| less than 2 W | · Lead interruption |
from: shielding
to: ground
Part 2
Mixture constantly too rich
(oxygen sensor voltage greater than 600 mV)
· Check fuel pump pressure
Feed pressure:
| Return pressure: | approx. 3.0 bar (idle speed) |
|---|---|
| approx. 0.3 to 1.5 bar | · Feed or return line plugged / kinked |
· Leaky injectors (dripping)
· Controlled canister purge system defective (see test step 22)
· Temperature sensor P 30 defective (see test step 02)
· Throttle valve potentiometer P 34 defective (see test step 04)
· Fuel pressure regulator defective
· Wrong injectors
| If all nominal values are attained: | · Check timing, oil consumption and valves for leaks |
· Internal exhaust gas reeirculation rate too large
· Control unit defective
Part 3
Mixture constantly too lean
(oxygen sensor voltage less than 300 mV)
· Check fuel pump pressure
Feed pressure:
| Return pressure: | approx. 3.0 bar (idle speed) |
|---|---|
| approx. 0.3 to 1.5 bar | · Feed line plugged / kinked |
· Injectors plugged or defective
· Connecting line from air cleaner to throttle valve housing leaks
· Controlled canister purge system defective (see test step 22)
· Intake manifold pressure sensor P 23 defective (see test step 03)
· Intake manifold pressure sensor hose defective
· Coolant temperature sensor P 30 defective (see test step 02)
· Throttle valve potentiometer P 34 defective (see test step 04)
· Fuel pressure regulator defective
· Intake system leaks
· Exhaust system leaks
· Poor fuel quality
· Wrong injectors
· Control unit defective