Mass Air Flow Sensor Plausibility Signal Ratio Error

Test 1 - 2:

Test 3 - 6:

Test 7 - 11:

Test 12 - 15:

Test 1:

SYMPTOM
P2068 - MASS AIR FLOW SENSOR PLAUSIBILITY SIGNAL RATIO ERROR

TEST NOTE
This symptom is diagnosed using the test P2065 - MASS AIR FLOW SENSOR SUPPLY VOLTAGE TOO HIGH.

WHEN MONITORED
With the ignition on.

SET CONDITION
The ECM detects a rationality problem with the MAF Sensor.


POSSIBLE CAUSES
- 12 volt supply circuit open
- Checking the engine control relay system
- ECM - 5-volt supply circuit
- Mass airflow sensor
- Sensor ground open
- Intermittent condition
- MAF sensor 5 volt supply circuit open
- MAF sensor signal circuit open
- MAF 5 volt supply circuit shorted to the sensor ground circuit
- MAF sensor signal circuit shorted to ground
- ECM sensor ground circuit open
- MAF sensor 5 volt supply circuit shorted to ground
- MAF sensor signal circuit shorted to the sensor ground circuit
- MAF sensor 5 volt supply circuit shorted to voltage
- MAF sensor circuit shorted to voltage
- ECM - MAF sensor signal circuit