Motronic M 1.5.4 F2:TROUBLE CODE TABLE
| Trouble Code | Information Sensor Cause of Fault | Data List No. | Trouble Code Storage when |
|---|---|---|---|
| 73 | MASS AIR FLOW | ||
| SENSOR VOLTAGE LOW | 07 | · Engine not in operating condition: Start |
· Engine speed greater than 520 rpm
· Mass air flow sensor signal less than 3 kg/h (Short circuit to ground)
Replacement value:
· The control unit refers to a characteristic curve to find a replacement value for the load signal which depends on the engine speed and the throttle valve angle.
· If the throttle position sensor is also defective, the following replacement values are used for calculation: For engine speed less than 1520 rpm with a load signal of 2.5 ms; For engine speed greater than 1520 rpm with a load signal of 4.8 ms.
Note:
| · Prevailing faults could be expected in the wiring harness. |