POSSIBLE CAUSES
SENSOR REFERENCE VOLTAGE A CIRCUIT SHORTED TO THE SENSOR GROUND CIRCUIT
MAF SENSOR SIGNAL CIRCUIT SHORTED TO GROUND
ECM SENSOR GROUND CIRCUIT OPEN
SENSOR REFERENCE VOLTAGE A CIRCUIT SHORTED TO GROUND
MAF SENSOR SIGNAL CIRCUIT SHORTED TO THE SENSOR GROUND CIRCUIT
SENSOR REFERENCE VOLTAGE A CIRCUIT SHORTED TO VOLTAGE
MAF SENSOR CIRCUIT SHORTED TO VOLTAGE
ECM - MAF SENSOR SIGNAL CIRCUIT
TEST
ACTION
APPLICABILITY
1
NOTE: If DTC P0641 or P0651 is present with this DTC, diagnose DTCs
P0641 and P0651 before diagnosing this DTC.
NOTE: Inspect the turbocharger inlet tube between the MAF Sensor and the
turbocharger for damage, restriction or poor connection. Any of these
conditions can cause a MAF Plausibility DTC.
NOTE: If the ECM detects and stores a DTC, the ECM also stores the
engine/vehicle operating conditions under which the DTC was set. Some of
these conditions are displayed on the DRB at the same time the DTC is
displayed.
NOTE: Before erasing stored DTCs, record these conditions. Attempting to
duplicate these conditions may assist when checking for an active DTC.
Turn the ignition on.
With the DRBIII
t, erase the ECM DTCs.
Test drive the vehicle.
With the DRBIII
t, read the ECM DTCs.
Does the DRB III display a Mass Air Flow Sensor DTC?
All
Yes
→ Go To 2
No
→ Go To 15
2
NOTE: A malfunctioning EGR system can cause this DTC to set. Refer to
symptom Checking the EGR System in the Driveability category to check
EGR system operation.
Turn the ignition off.
Disconnect the MAF Sensor harness connector.
Turn the ignition on.
Measure the voltage of the Sensor Reference Voltage A circuit in MAF Sensor harness
connector.
Is the voltage between 4.8 and 5.2 volts?
All
Yes
→ Go To 3
No
→ Go To 11
11
DRIVEABILITY - DIESEL
P0100-MASS AIR FLOW SENSOR PLAUSIBILITY —
Continued