DTC Advanced Diagnostics: P2074
DTC P2074:Manifold Absolute Pressure (MAP) Sensor Signal Lower Than Expected

General Description


The manifold absolute pressure (MAP) sensor senses manifold absolute pressure (vacuum) and converts it into electrical signals. The MAP sensor outputs low signal voltage at high vacuum (throttle valve closed) and high signal voltage at low vacuum (throttle valve wide open). The powertrain control module (PCM) compares a predetermined MAP value at a given throttle position and manifold absolute pressure to the output voltage value of the MAP sensor. If the MAP sensor outputs lower voltage than expected, the PCM detects a malfunction and stores a DTC.

Monitor Execution, Sequence, Duration, DTC Type
Execution
Once per driving cycle
Sequence
None
Duration
2.0 seconds or more
DTC Type
Two drive cycles, MIL on

Enable Conditions
Condition
Minimum
Maximum
Elapsed time after VTEC switched
3 seconds
–
Engine coolant temperature [ECT SENSOR 1]
156 °F (69 °C)
–
Engine speed
[ENGINE SPEED]
1,200 rpm
–
Vehicle speed
[VEHICLE SPEED]
15 mph (24 km/h)
–
Throttle position
1,000 rpm
12.0 °
–
4,000 rpm
30.7 °
–
Other
Other than during fuel cut-off operation
[ ]: HDS Parameter

Malfunction Threshold
The MAP sensor output [MAP SENSOR] is 54 kPa (406 mmHg, 15.9 inHg) or less for at least 2.0 seconds when atmospheric pressure [BARO SENSOR] is 103 kPa (776 mmHg, 30.6 inHg).

Possible Cause
NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
MAP sensor output signal low
Intake air system clogged

Confirmation Procedure
Operating Condition
1.
Start the engine. Hold the engine speed [ENGINE SPEED] at 3,000 rpm without load (CVT in P or N, M/T in neutral) until the radiator fan comes on.
2.
Drive the vehicle at a speed of 15 mph (24 km/h) or more under Enable Conditions (see "Throttle position" and "Engine speed [ENGINE SPEED]") for at least 2 seconds.
Drive the vehicle in this manner only if the traffic regulations and ambient conditions allow.
With the HDS
None.

Diagnosis Details
Conditions for setting the DTC
When a malfunction is detected during the first drive cycle, a Pending DTC is stored in the PCM memory. If the malfunction returns in the next (second) drive cycle, the MIL comes on and a Confirmed DTC and the freeze data are stored.

Conditions for clearing the DTC
The MIL is cleared if the malfunction does not return in three consecutive trips in which the diagnostic runs. The MIL, the Pending DTC, the Confirmed DTC, and the freeze data can be cleared with the scan tool Clear command or by disconnecting the 12 volt battery.