Diagnostic Aids
WARNING: This page does not describe the selected car, but rather 10 other vehicles, including the 2002 Ford RV Cutaway, 2002 Ford Pickup, 2002 Ford F550 Super Duty, 2002 Ford F450 Super Duty, and 2002 Ford Excursion. However, it is still accessible from the selected car via links, so may be relevant.
Perform this test when directed by QUICK TEST. This test is only intended to diagnose the following components and circuits:
- Manifold Absolute Pressure (MAP) sensor.
- Wiring Harness Circuits (VREF, SIG RTN & MAP SIG), see Fig 1.
- Powertrain Control Module (PCM).
Manifold Absolute Pressure (MAP) sensor functions are as follows:
- Smoke Control
MAP signal is used to control smoke by limiting fuel quantity during acceleration until a specified boost pressure is obtained. - Dynamic Injection Timing
Optimizes injection timing for boost pressure measured. - Fault Detection & Management
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.
MAP SENSOR SPECIFICATIONS
| Psi (kPa) | (1) Volts | ||
|---|---|---|---|
| 11.5 (80) | 1.1 | ||
| 14.7 (101) | 1.5 | ||
| 20 (138) | 2.2 | ||
| 25 (172) | 2.8 | ||
| 30 (206) | 3.6 | ||
| 35 (242) | 4.3 | ||
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