PEC fuel injection and ignition system diagnosis operational check actual values (warming-up)

AD07.52-S-3003A

PEC fuel injection and ignition system diagnosis operational check actual values (warming-up)

5.5.97

Fuel injection and ignition system (PEC) diagnosis, previous knowledge

AD07.52-S-2000A

Function check

Actual value no.

Actual value

Specified value

Possible cause/Remedy



Engine coolant temperature

°C

Proceed on the basis of complaint or temperature-dependent



Time-dependent engine speed when hot (increased idle speed):

Engine coolant temperature °C for approx. 60 seconds

M111.948: +208 rpm

M111.978: +256 rpm

(temperature-dependent specified engine speed + engine speed when hot)

Proceed on the basis of complaint or temperature-dependent



Temperature-dependent idle speed increase:

Engine coolant temperature –20 °C

Engine coolant temperature 0 °C

Engine coolant temperature+20 °C

Engine coolant temperature+60 °C

Engine coolant temperature > 80 °C

 Read off approx. 60 seconds after starting

108350 rpm

94450 rpm

89650 rpm

80050 rpm

75250 rpm



Intake air temperature

> 20 °C



Warm-up (engine coolant temperature)

Display: ON (< approx. 50°C)

(until Lambda control comes into use)

Display: OFF (> approx. 50°C)



Selector lever position

Depending on selector lever position



A/C compressor (not operated)

Display: OFF