Specifications

Symptom List:
P2066-MASS AIR FLOW SENSOR PLAUSIBILITY
P2355-EGR FLOW RATE IS TOO HIGH
P2355-EGR FLOW RATE IS TOO LOW
Test Note: All symptoms listed above are diagnosed using the same tests.
The title for the tests will be P2066-MASSAIR FLOW SENSOR
PLAUSIBILITY.
When Monitored and Set Condition:
P2066-MASS AIR FLOW SENSOR PLAUSIBILITY
When Monitored: With the engine running.
Set Condition: The ECM detects a rationality problem with the MAF Sensor or excessive
EGR flow.
POSSIBLE CAUSES
AIR FILTER
AIR RESTRICTION
CHECKING FOR AIR LEAKS
EGR ACTUATION - 1200 RPM
EGR VALVE
MAF SENSOR
MAF SENSOR READING - 3OOO RPM
INTERMITTENT CONDITION
EGR RESTRICTION
TEST ACTION APPLICABILITY
1 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 DRB, erase ECM DTCs.
Test drive the vehicle and monitor the DRB for ECM DTCs.
Did this DTC set again?
All
Yes → Go To 2
No → Go To 10
150
DRIVEABILITY - DIESEL