Pinpoint Test D: Manifold Absolute Pressure Sensor: Description

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Manifold Absolute Pressure (MAP) sensor is a variable capacitance sensor which, when supplied with a 5-volt reference signal from Powertrain Control Module (PCM), produces a digital frequency signal that indicates pressure. MAP signal is used to control smoke by limiting fuel quantity during acceleration until a specified boost pressure is obtained. Dynamic injection timing is used to optimize injection timing for boost pressure measured. A MAP signal that is detected by PCM to be out of range or at an incorrect value for specific conditions, will cause PCM to ignore MAP signal and operate engine from an inferred boost pressure signal. DTC 0235 indicates MAP Signal Inactive (1995 models). DTC 0236 indicates turbo boost sensor "A" circuit performance. DTC 0237 indicates turbo boost sensor "A" circuit low input. DTC 0238 indicates turbo boost sensor "A" circuit high input.

Perform this test when directed here by QUICK TEST . This PINPOINT TEST is intended to diagnose the following:

MAP sensor.
Wiring harness circuits; (VREF, SIG RTN and MAP SIG).
Powertrain Control Module (PCM).

Fig 1: Identifying MAP Sensor Circuit Checks & Connector Terminals (1 Of 2)

Courtesy of FORD MOTOR CO.

Fig 2: Identifying MAP Sensor Circuit Checks & Connector Terminals (2 Of 2)

Courtesy of FORD MOTOR CO.