Prelude L4-2.2L SOHC (1994)
Manifold Pressure/Vacuum Sensor: Testing and Inspection
INSPECTION
There are two tests of the Manifold Absolute Pressure (MAP) Sensor; Electrical test and Mechanical test.
Electrical Test
1. Turn ignition switch off. Disconnect the three pin connector from the MAP sensor. Turn ignition on.
MAP Sensor Connector Terminal Identification
2. Measure voltage between RED/WHITE (+) terminal and chassis ground. Voltage should read 5.0 volts.
3. Measure voltage between RED/WHITE (+) terminal and BLUE/WHITE (-) terminal. Voltage should read 5.0 volts.
4. Measure voltage between WHITE/BLUE (+) terminal and BLUE/WHITE (-) terminal. voltage should read 5.0 volts.
5. Turn ignition switch off. Reconnect the three pin connector at the Map sensor. Connect the test harness between the Programmed Fuel Injection
Electronic Control Module (PGM-FI ECM) and the harness. Turn ignition switch on.
PGM-FI ECM Connector Description And Wire Location
6. Measure voltage between terminals D17 (+) and D21 (-). Voltage should read 3.0 volts. If not, replace MAP sensor. If voltage OK, substitute
known good PGM-FI ECM and retest.
NOTE: If voltage readings at steps 2,3 and 4 do not test ok, inspect RED/WHITE (+), BLUE/WHITE (-) and WHITE/BLUE (+) wires between the
three pin connector and the PGM-FI ECM harness connector for shorts and opens.
Mechanical Test
1. Turn ignition switch off.