DTC P1129: Manifold Absolute Pressure (MAP) Sensor Signal Higher Than Expected (USA and Canada models) (2013-15)

General Description 

Courtesy of HONDA, U.S.A., INC.

Courtesy of HONDA, U.S.A., INC.

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 high voltage during fuel cut-off operation for deceleration with the throttle valve fully closed, which should make the manifold absolute pressure lower, the PCM detects a malfunction and stores a DTC.

Monitor Execution, Sequence, Duration, DTC Type, OBD Status 

Execution	Once per driving cycle
Sequence	None
Duration	2.0 seconds or more

DTC Type	Two drive cycles, MIL on
OBD Status	PASSED/FAILED/NOT COMPLETED (STILL TESTING)

Enable Conditions 

Condition	Minimum	Maximum
Elapsed time after cylinder pausing	3.0 seconds	-
Engine coolant temperature [ECT SENSOR 1]	156 °F (69 °C)	-
Engine speed [ENGINE SPEED]	1, 200 rpm	5, 500 rpm
Vehicle speed [VEHICLE SPEED]	15 mph (24 km/h)	-
Throttle position	Fully closed	-
Fuel feedback	During deceleration	-
No active DTCs set (prevents monitor from running)*1	P0107, P0108, P0117, P0118, P0122, P0123, P0171, P0172, P0174, P0175, P0222, P0223, P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0351, P0352, P0353, P0354, P0355, P0356, P0401, P0404, P0443, P0496, P0497, P0506, P0507, P060A, P0722, P1128, P145C, P1659, P2101, P2118, P2122, P2123, P2127, P2128, P2135, P2138, P2176, P2279, P2413, P2649, P2654, P2659, P3400, P3497
No active DTCs set (prevents monitor from running)*2	P0107, P0108, P0117, P0118, P0122, P0123, P0171, P0172, P0174, P0175, P0222, P0223, P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0351, P0352, P0353, P0354, P0355, P0356, P0401, P0404, P0443, P0496, P0497, P0506, P0507, P060A, P0722, P1128, P145C, P1659, P2101, P2118, P2135, P2176, P2279, P2413, P2649, P2654

*1: 2013 - 2014 models*2: 2015 model on and after[ ]: HDS Parameter

Malfunction Threshold 

When 6 cylinder mode (no cylinders are paused), the MAP sensor output [MAP SENSOR] is 37 kPa (11.0 inHg, 277 mmHg) or more for at least 2.0 seconds.

When 4 or 3 cylinder mode (2 or 3 cylinders are paused), the MAP sensor output [MAP SENSOR] is 53 kPa (15.0 inHg, 405 mmHg) or more for at least 2.0 seconds.

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 high
• Evaporative emission (EVAP) canister purge valve failure
• Valve timing incorrect
• Intake air system air leak

Confirmation Procedure 

With the HDS 

None.

With the Driving Pattern 

Courtesy of HONDA, U.S.A., INC.

• 1.

  Start the engine. Hold the engine speed [ENGINE SPEED] at 3, 000 rpm without load (in P or N) until the radiator fan comes on.

• 2.

  Drive the vehicle at a steady speed between 55 - 75 mph (88 - 120 km/h) for at least 10 seconds.

• 3.

  Decelerate with the throttle valve fully closed with the vehicle speed [VEHICLE SPEED] 15 mph (24 km/h) or more for at least 5 seconds.

• Drive the vehicle in this manner only if the traffic regulations and ambient conditions allow.

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 battery.