Isuzu 2000 Trooper Workshop Manual page 1018

D Damaged harness – Inspect the wiring harness for
damage. If the harness appears to be OK, observe the
MAP display on the Tech 2 while moving connectors
and wiring harnesses related to the sensor. A change
in the display will indicate the location of the fault.
If DTC P0108 cannot be duplicated, the information
included in the Failure Records data can be useful in
DTC P0108 – MAP Sensor Circuit High Voltage
Step
1 Was the "On-Board Diagnostic (OBD) System Check"
performed?
2 1. If the engine idle is rough, unstable or incorrect,
repair the idle problem before using this chart. Refer
to Symptoms section.
2. With the engine idling, note the MAP value on the
Tech 2.
Is the MAP reading above the specified value?
3 1. Ignition "ON," engine "OFF."
2. Review and record Tech 2 Failure Records data.
3. Operate the vehicle within Failure Records
conditions as noted.
4. Using a Tech 2, monitor "DTC" info for DTC P0108.
Does the Tech 2 indicate DTC P0108 failed this
ignition?
4 1. Ignition "OFF."
2. Disconnect the MAP sensor electrical connector.
3. Ignition "ON."
4. Note the MAP sensor voltage displayed on the Tech
2. (If no, start with diagnostic chart for other sensors
in the circuit and see if 5V returns.)
Is the MAP sensor voltage at the specified value?
5 Probe the sensor ground circuit with a test light to B+.
Is the test light "ON?"
6 1. Check the MAP signal circuit for a short to voltage or
a short to the 5 volt reference circuit.
2. If the MAP sensor signal circuit is shorted, repair
circuit as necessary.
Was the MAP sensor signal circuit shorted?
7 1. Check for a poor sensor ground terminal connection
at the MAP sensor electrical connector.
2. If a problem if found, replace the faulty terminal.
Did the terminal require replacement?
8 Check for a plugged or leaking vacuum supply to the
MAP sensor.
Is the vacuum supply plugged or leaking?
9 1. Check for a poor sensor ground terminal connection
at the PCM.
2. If a problem is found, replace the faulty terminal.
Did the terminal require replacement?
TROOPER 6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Action
determining vehicle mileage since the DTC was last set. If
it is determined that the DTC occurs intermittently,
performing the DTC P1108 Diagnostic Chart may isolate
the cause of the fault.
Value(s)
— Go to Step 2
Go to Step 4
90 kPa
Go to Step 4
—
11 kPa 0.0
Go to Step 5
V
— Go to Step 7
— Verify repair
— Verify repair
— Verify repair
— Verify repair
6E–149
Yes No
Go to OBD
System
Check
Go to Step 3
Refer to
Diagnostic
Aids
Go to Step 6
Go to Step 9
Go to Step 11
Go to Step 8
Go to Step 12
Go to Step 10