Motronic M 1.5.4 F2:TROUBLE CODE TABLE
| Trouble Code | Information Sensor Cause of Fault | Data List No. | Trouble Code Storage when |
|---|---|---|---|
| 74 | MASS AIR FLOW | ||
| SENSOR VOLTAGE HIGH | 07 | · Engine speed less than 6520 rpm |
· Mass air flow sensor signal greater than 435 kg/h (Short circuit to voltage)
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. |