Multec-M (14 SE / C 14 SE / C 16 SE) F0:DATA LIST
| No. | TECH 1 Display | Conditions for Checking | Nominal Value | Trouble Codes | Terminal |
|---|---|---|---|---|---|
| 18 | O2 SENSOR | Ignition ON |
Engine cold!
Engine running at idle speed, operating temperature
350 to 550 mV
50 to 950 mV alternating
| 13,44,45 | B 11/B 10 | ||
|---|---|---|---|
| Trouble-shooting: | Nominal Value: | Cause of Fault: | |
| (If nominal value is not attained) |
· Disconnect wiring harness plug from oxygen sensor
· Measure voltage:
from: wiring harness plug P 33
to: ground
| · Ignition ON | |
|---|---|
| 300 to 550 mV | · Lead interruption |
from: wiring harness plug P 33
to: control unit K 57/K 91 Ter. B 11
· Lead interruption
from: control unit K 57/K 91 Ter. B 10
to: ground
(with display 800 to 1000 mV)
· Short circuit in wiring harness
from: control unit K 57/K 91 Ter. B 1
to: ground
· Control unit defective
· Engine in TECH 1 mode "F8" submode "F0".
Using arrow keys, set to 1300 rpm
· Measure voltage:
from: oxygen sensor plug
to: ground
(oxygen sensor plug disconnected)
50 to 950 mV
| · Oxygen sensor defective |
· Accelerate briefly
| when accelerating greater |
than 700 mV
| · Mixture constantly too lean/rich |
(see overleaf)
· Check oxygen sensor (see below)
· Check oxygen sensor:
· Using multimeter, measure voltage:
from: oxygen sensor plug
to: oxygen sensor ground (thread)
| greater than 22 kW | · Oxygen sensor defective |
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)
0.3 - 1.5 bar
· Return line blocked/kinked
· Leaky injectors (injector drips)
· Active carbon canister or line to intake manifold leaky
· Active carbon canister - valve defective
· Temperature sensor P 30 defective (see test step 03)
· Intake manifold pressure sensor defective (see test step 05)
Intake manifold pressure sensor hose leaky, jams
· Throttle valve potentiometer defective (see test step 06)
· Fuel pressure regulator defective
If all nominal values are attained:
· Internal exhaust gas recirculation rate too large
| · Check valve timing and tightness |
· 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)
0.3 - 1.5 bar
| · Feed line blocked / kinked |
· Injectors blocked or defective
· Connection line from air cleaner to throttle body leaky
· Active carbon canister or line to intake manifold leaky
· Intake manifold pressure sensor defective (see test step 05)
Intake manifold pressure sensor hose defective
· Temperature sensor P 30 defective (see test step 03)
· Throttle valve potentiometer defective (see test step 06)
· Fuel pressure regulator defective
· Intake system leaky
· Exhaust system leaky
· Poor fuel quality
· Control unit defective