EGR MDP MAP tests.
It's just a BARO sensor. (electronic barometer)
Disconnect EGR MAP sensor vacuum hose and harness connector.
The ECU uses this baro sensor to test the EGR live funcitioning, and nothing else.
Remove the MAP sensor. (clean it)
FSM steps:
Connect three 1.5 volt batteries in series. (a 4.5v battery pack is best or a common 5vdc power supply)
Never, use 12vdc power on this sensor.
Using 1/2 amp fused jumper + wire, connect positive lead to "Vin" terminal,
and negative wire to "Ground" terminal of MAP sensor. See Drawig below .
Using a voltmeter, measure voltage between "Vout" and "Ground" terminals.
Connect a hand-held vacuum pump to MAP sensor nipple,
As vacuum is applied, voltage reading must decrease. See MAP SENSOR
VOLTAGE table below,
If reading is not as specified, replace MAP sensor. Retest EGR system.
This sensor rarely fails, if ever. (but does get dirty, all things in the intake get full of gunk from EGR + PCV actions) CLEAN IT.
MAP SENSOR VOLTAGE (FSM spec)
Applied Vacuum: inches of Hg (mm of Hg) Output: Voltage [ Hg = Mercury , a latin symbol) My hand tool , pump has an HG inches vacuum gauge built in to tool.
Relative Vacuum (not absolute) tool readings actual. (BAR x 100 = kPa)
| Inches HG |
MM HG |
Bar |
volts output |
|
7.9 |
200 |
.27 |
2.40-4.40v |
| 9.8 |
250 |
.33 |
2.13-4.13v |
| 11.8 |
300 |
.40 |
1.86-3.86v |
| 13.8 |
350 |
.47 |
1.59-3.59v |
| 15.7 |
400 |
.53 |
1.32-3.32v |
You could just leave it connected to car, pull the thing off engine (connector still attached), and attach a vacuum pump, key on and read the voltage on Vout pin1.
pin 1 Vout ,Brown-red
pin 2 ground, gray-yell
pin 3 +5vdc gry/red
Do not connect it wrong or you will blow it up.
Harbor Freight has the VAC tool for $20 ( and is made of brass and steel !)
Drawing 1: FSM way.
