AR07.07-P-1453GZA | Remove/install hot film mass air flow sensor | 24.9.09 |
ENGINE 272, 273 in MODEL 164, 251
P07.07-2054-04
Shown on engine 272
1 Air cleaner housing
3a Right notch
3b Left notch
4 Air duct housing
7 Gasket
A Grid
B2/5 Hot film mass air flow sensor
P07.07-2080-11
Shown on ENGINE 272.973 in MODEL 164.195
8 Air filter box
9 Partition wall section on the RH
10 Air cleaner housing
11 Air duct
Modification notes
19.8.09 | Remove air filter box, RH partition wall section, air filter housing, air duct | Steps 2.2 to 4 |
| Remove/install | ||
Danger! | Risk of injury caused by fingers being pinched or crushed when removing, installing or aligning hoods, doors, trunk lids, liftgates or sliding roof | Keep body parts and limbs well clear of moving parts. | |
| Information on preventing damage to electronic components due to electrostatic discharge | ||
1 | Switch off ignition and remove the transmitter key from the EIS [EZS] control unit | On vehicles with code (889) Keyless Go: Press keyless go start/stop button repeatedly until ignition is switched off. Remove transmitter key from vehicle and store it in a location beyond its transmission range (at least 2 m). | |
2.1 | Remove air filter housing (1). | Except engine 272.973 in model 164.195 | |
2.2 | Remove air filter box (8) | Engine 272.973 in model 164.195 | |
3 | Remove RH partition wall section (9) | Engine 272.973 in model 164.195 | |
4 | Remove air filter housing (10) and air duct (11) | Engine 272.973 in model 164.195 | |
Handle air duct (11) carefully; risk of breakage of the hot film MAF sensor (B2/5). | |||
5 | Separate electrical connector at hot film mass air flow sensor (B2/5) | ||
6 | Disengage the right notch (3a) of the hot film mass air flow sensor (B2/5) on resonance intake manifold | Pull right notch (3a) to the outside until it can no longer latch again on resonance intake manifold. | |
Never use force as the notches can break off! If the notches (3a, 3b) break off, the entire hot film MAF sensor (B2/5) must be replaced. | |||
7 | Unlatch left notch (3b) on hot film MAF sensor (B2/5) on resonance intake manifold and remove hot film MAF sensor (B2/5) upwards | Do not the damage the grid (A) in the process as it cannot be replaced separately! | |
Never use force as the notches can break off! If the notches (3a, 3b) break off, the entire hot film MAF sensor (B2/5) must be replaced. | |||
| Checking | ||
8 | Check gasket (7) between air duct housing (4) and hot film mass air flow sensor (B2/5) | Check seal (7) for damage; replace if necessary. | |
9 | Check right notch (3a) and left notch (3b) | If notches (3a, 3b) are damaged, then the entire hot film MAF sensor (B2/5) must be replaced with a new one. | |
10 | Install in the reverse order | ||
11 | Read out fault memory and erase if necessary | Faults which may have been caused by disconnecting wires or by a simulation must be erased in the fault memory after completing the work. | |
STAR DIAGNOSIS diagnosis system |
Referenced documents
- ah5400p000101a Information on preventing damage to electronic components due to electrostatic discharge
- ar0910p1150gza Remove/install air filter housing
- as0000z001101a Risk of injury caused by fingers being jammed or pinched when removing, installing or aligning hoods, doors, trunk lid/rear-end door or sliding roof.