Jaguar P1128 Manifold Absolute Pressure Sensor Signal Lower Than Expected

Description

Possible causes
– Engine mechanical condition
– Faulty Manifold Absolute Pressure (MAP) sensor
– Manifold Absolute Pressure (MAP) sensor harness is open or shorted
– Manifold Absolute Pressure (MAP) sensor circuit poor electrical connection
Symptoms
– Engine Light ON (or Service Engine Soon Warning Light)
P1128 Jaguar ACURA OBD Code 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 (idling) and high signal voltage at low-vacuum (throttle valve wide open).

The engine control module (ECM) 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 ECM detects a malfunction and stores a DTC.


The OBD2 Code Information Be Applicable For Jaguar:

2013 Jaguar XJ,2013 Jaguar XF,2013 Jaguar XFR,2012 Jaguar XKR,2012 Jaguar XJ,2012 Jaguar XFR,2012 Jaguar XF,2011 Jaguar XKR,2010 Jaguar XKR,2010 Jaguar XJ,2010 Jaguar XFR,2010 Jaguar XF,2009 Jaguar XF,2008 Jaguar XJ,2007 Jaguar XKR,2007 Jaguar XK,2006 Jaguar XJ,2003 Jaguar RD6 Concept

 

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