DTC 1-2-1 Mass Air Flow Sensor Signal

1-2-1 MASS AIR FLOW SENSOR SIGNAL

Condition(s) for DTC
^ Since the computed mass air flow is determined largely by the injection period, the system is dependent on the Mass Air Flow (MAF) Sensor signal. The DTC is recorded if the control module detects that the signal is lower than 2.7V or higher than 8V.

Substitute value
^ The control module assumes a fixed load signal value (limp home) when the DTC is recorded. The adaptive and idling control functions are inhibited, and the ICM and AW 50-42 TCM load signal is adjusted to the full-load value.

Fault source(s)
^ Open-circuit in signal or supply lead.
^ Signal lead short-circuited to ground or supply.
^ Contact resistance in connections.
^ MAF sensor faulty.

Fault symptom(s)
^ None.