Corolla LE Sedan L4-1762cc 1.8L DOHC MFI (1998)
Manifold Absolute Pressure (MAP) Sensor: Testing and Inspection
INSPECTION
1. INSPECT POWER SOURCE VOLTAGE OF MAP SENSOR
(a) Disconnect the MAP sensor connector.
(b) Turn the ignition switch ON.
(c) Using a voltmeter, measure the voltage between connector terminals VC and E2 of the wiring harness side.
Voltage: 4.5 - 5.5V
(d) Turn the ignition switch OFF.
(e) Reconnect the MAP sensor connector.
2. INSPECT POWER OUTPUT OF MAP SENSOR
(a) Remove the 2 bolts and MAP sensor from throttle body.
(b) Connect the MITYVAC (hand-held vacuum pump) and hose with 5 mm inside diameter.
(c) Turn the ignition switch ON.
(d) Connect a voltmeter to terminals PM and E2 of the ECM and measure the output voltage under ambient.
(e) Apply vacuum to the MAP sensor in 13.3 kPa (100 mmHg, 3.94 in.Hg) segments to 66.7 kPa (500 mmHg, 19.69 in.Hg).
(f) Measure the voltage drop from step (c) above for each segment.
Voltage drop:
(g) Disconnect the MITYVAC (hand-held vacuum pump) and hose with 5 mm inside diameter.
(h) Install the MAP sensor with the 2 bolts.
