Condition for fault identification

Test condition:

This fault is recognized when the period duration of the HFM signal is less than 84 μs.

Potential problem source(s):

• Defect in wiring harness between HFM and DME
• Mass-airflow sensor defective
• Defective DME

Terminal condition: none

Voltage condition:

• Onboard electrical system voltage between 9 V and 16 V

Temperature condition:

• None

Time condition:

• None

Other conditions:

• Engine ON