Haltech E6M - Manual (Page 19)

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There are three types of MAP sensors that can be used with E6H/E6M system. Which sensor
is required depends on the engine set-up.
1 Bar Sensor (Part No. 039 xxxx)
(-100kPa to 0kPa) Normally Aspirated Engines
2 Bar Sensor (Part No. 539 xxxx)
(-100kPa to 100kPa) Turbo or Supercharged
Engines up to 100kPa boost
(15 psi , 1 atmosphere)
3 Bar Sensor (Part No. 749 xxxx)
(-100kPa to 200kPa) Turbo or Supercharged
Engines up to 200kPa boost
(30 Psi, 2 atmospheres)
Note: Make sure you have the correct MAP sensor for your engine. The first
three digits of the part number stamped on the sensor housing identify the part.
The last four digits are a batch number and continually change.
If the engine is running in Throttle Position mode it should use a 1 Bar MAP
sensor (left open to atmosphere) to measure the barometric pressure.
If the engine is running in Manifold Pressure Mode, at least one MAP sensor
must be used. The first MAP sensor must be connected to the MAP Input plug
on the wiring loom and provides an indication of the engine load. The second
MAP sensor is used for barometric compensation and is optional. If enhanced
barometric correction is required (which is rare) then a second 1 Bar MAP
sensor (left open to atmosphere) can be fitted, it connects to the Spare Input
plug near the Main Connector.
Mounting
The MAP sensor is usually mounted high on the engine bay firewall or inner guard using two
screws and with the hose nipple facing outwards. Connect the sensor to the inlet manifold via
a short length of vacuum hose and fasten with either hose clamps or nylon cable ties. Connect
the sensor to the main wiring harness using the appropriate plug. (For 1 Bar sensors the plug
is green, for 2 and 3 Bar sensors the plug is orange). Avoid mounting the sensor below the
level of the fuel injectors, because fuel may collect in the vacuum hose and run down into the
sensor. The sensor assembly is weather-proof but it is good practice to mount the sensor in a
protected position away from moisture and heat.