P0102

Read the instructions below then start the fault diagnostic procedure.

Symptom: CHECK ENGINE comes on after two driving cycles. Engine speed drops slower than normal when the accelerator is released. Possible misfiring before DTC is generated.

P0102

Fault symptoms

•	CHECK ENGINE comes on after two driving cycles.

•	Engine speed drops slower than normal when the accelerator is released.

•	Possible misfiring before DTC is generated.

Conditions

The following conditions apply for this DTC.

•	Crankshaft rotating and main relay voltage exceeds 10 V.

•	Frequency lower than 500 Hz for more than 0.5 s.

Diagnostic help

The mass air flow sensor sends pulses to the control module but the frequency is too low. The sensor is supplied with current and connected to the control module input.

In most cases, this diagnostic trouble code indicates an internal fault in the sensor, but can also be caused by a large leak between the sensor and the throttle. For example, the diagnostic trouble code could be set if the sensor is removed.

Diagnostic tool functions related to this fault are:

•	Mass air flow sensor reading, in g/s.

•	Airmass deviation from calculated, in %.

See also the description of readings under Menu "Read Values" for more information.

Check the wiring

Note

Jiggle the leads and in-line connectors at various points and in different directions to detect any intermittent breaks or short circuits in the wiring. Observe the multimeter, test lamp or diagnostic tool while doing this.