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Home >> Mercedes Benz >> 1998 >> E430 >> Repair and Diagnosis >> Engine Performance >> Ignition System >> Mixture Formation - Basic Knowledge - 210 Chassis (Part 1) >> Basic Knowledge >> IFI [ERE] A/C compressor shutoff function - GF07.12-P-3011H

IFI [ERE] A/C compressor shutoff function - GF07.12-P-3011H

ENGINE 605.910 in MODEL 202.125 

ENGINE 605.960 in MODEL 202.128 /188 

ENGINE 605.912 in MODEL 210.010 /210 /610 

ENGINE 606.912 in MODEL 210.020 

ENGINE 606.962 in MODEL 210.025 /225 

ENGINE 606.961 in MODEL 140.135 

ENGINE 605.962 in MODEL 210.015 /215 

Fig 1: Identifying IFI (ERE) A/C Compressor Shutoff Function
G04623944Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Task 

To shut off A/C compressor so as to improve acceleration from rest.

Function 

The TAC pushbutton control module (N19/1) or the AAC [KLA] pushbutton control module (N22) receives a signal from the IFI [ERE] control module (N3/7) telling the A/C compressor to switch on or off depending on load and engine speed.

A/C compressor off:

At engine load >90% AND engine speed <1050 rpm

A/C compressor on:

At engine load <90% OR engine speed >2500 rpm

  Overvoltage protection relay location/design/task/function MODEL 202 to 07/96 GF07.13-P-3100H
  Fuse and relay module location/task/function Model 202 as of 08/96
Model 210 as of 03/97
GF07.13-P-3141H
  Relay module location/task/design/function Model 210 to 02/97 GF07.13-P-3101H
  IFI [ERE] control module location/task/function Model 202.125
Model 202.128 to 07/96
Model 210.010 to 05/96
Model 210.020
Model 210.020 USA ONLY to 05/96
GF07.12-P-3102H 
    Model 202.128 as of 04/96
Model 202.188
Model 210.010 as of 06/96
Model 210.210/610
Model 210.020 USA ONLY as of 06/96
Model 210.015/215
Model 210.025/225
Model 140.135
GF07.12-P-3102HA 
  Crankshaft position sensor location/task/design/function   GF07.04-P-4116H 
  Accelerator pedal position sensor location/task/design/function   GF07.04-P-5029H 
  IFI fuel quantity actuator location/task/function   GF07.12-P-3131H 
  Fuel rack position sensor location/task/design/function   GF07.04-P-5022H 
  TAC pushbutton control module function   GF83.30-P-2000A
  AAC [KLA] pushbutton control module function   GF83.40-P-2000A
  Instrument cluster (A1):
K1 and K2 lead location/task
  GF54.30-P-2015A
  CAN databus function   GF54.00-P-0005HA