Isuzu 1999 RODEO Workshop Manual page 728

Manifold Absolute Pressure (MAP) Output Check
Step
1 1. Turn the ignition OFF and leave it OFF for 15
seconds.
2. Ignition ON. Do not crank engine.
3. The Tech 2 should indicate a manifold absolute
pressure (MAP) sensor voltage.
4. Compare this scan reading to the scan reading of a
known good vehicle obtained using the exact same
procedure as in Steps 1–4.
Is the voltage reading the same +/– 0.40 volt?
2 1. Disconnect the vacuum hose at the MAP sensor
and plug the hose.
2. Connect a hand vacuum pump to the MAP sensor.
3. Start the engine.
4. Apply 34 kPa (10 Hg) of vacuum and note the
voltage change.
Is the voltage change 1.5–2.1 volts less than step 1?
3 Check the sensor hose for leakage or restriction.
Does the hose supply vacuum to the MAP sensor only?
4 Repair the hose to ensure the hose supplies vacuum to
the MAP sensor only.
Is the action complete?
5 Check the sensor connection.
Is the sensor connection good?
6 Refer to On–Vehicle Service, MAP Sensor.
Is the action complete?
7 Repair the poor connection.
Is the action complete?
RODEO X22SE 2.2L ENGINE DRIVEABILITY AND EMISSION
Action Value(s) Yes
— Go to Step 2
— Go to Step 3
— Go to Step 5
— Verify repair
— Go to Step 6
— Verify repair
— Verify repair
6E1–101
No
Go to Step 5
Go to Step 4
Go to Step 4
—
Go to Step 7
—
—