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 |
|---|---|---|---|---|---|
| 33 | CO FUEL CORREC. | Ignition ON |
Engine running at idle speed, operating temperature
This test step is only used with the 14 SE engine.
| 120 steps | |
|---|---|
| 115 to 140 steps |
For 14 SE engines, the CO concentration in the exhaust must be adjusted with TECH 1. See TECH 1 F6: Adjustments.
The adjustment procedure must be checked using an exhaust gas tester, as the TECH 1 display indicates the permissible adjusting range only. Thus the display in TECH 1 is not a standard measurement. The adjustment procedure corresponds to reprogramming, and so is maintained even after "Ignition OFF".
The CO tolerance range indicated in TECH 1 is merely a recommendation. The relevant limits specific to each country must be observed. If the CO adjustment fails, repeat the CO adjustment after a control unit reset (disconnect control unit from the vehicle voltage supply). If a CO adjustment fails in this case too, the control unit must be replaced.
Adjustment procedure: No trouble codes stored
Vehicle speed 0 km/h (0 mph)
Coolant temperature greater than 75 °C/167 °F
Engine running for at least 5 minutes
Adjustment: Engine running at idle speed, operating temperature
Idle air control: ACTIVE
Engine running for not more than 15 minutes in this adjustment mode
The engine speed is increased via TECH 1 to 1500 rpm.
Adjustment value : 0.5 - 1.5 Vol % CO
Test values at idle : 0.1 - 0.5 Vol % CO (test step 33)