Isuzu 2000 Trooper Workshop Manual page 1015

6E–146
TROOPER 6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
locks, improperly formed or damaged terminals, and
poor terminal-to-wire connection.
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.
DTC P0107 – MAP Sensor Circuit Low Voltage
Step
1 Was the "On-Board Diagnostic (OBD) System Check"
performed?
2 1. Ignition "ON," engine "OFF."
2. With the throttle closed, observe the MAP value
displayed on the Tech 2.
Is the MAP value near 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 P0107.
Does the Tech 2 indicate DTC P0107 failed?
4 1. Ignition "OFF."
2. Disconnect the MAP sensor electrical connector.
3. Jumper the 5 volt reference circuit and the MAP
signal together at the MAP sensor harness
connector.
4. Ignition "ON."
5. Observe the MAP value displayed on the Tech 2.
Is the MAP value near the specified value? (If no, start
with diagnosis chart for other sensors in the circuit and
see if 5V returns.)
5 1. Disconnect the jumper.
2. Connect a test light between B+ and the MAP
sensor signal circuit at the MAP sensor harness
connector.
3. Observe the MAP value displayed on the Tech 2.
Is the MAP value near the specified value.
6 1. Ignition "OFF."
2. Disconnect the PCM and check the 5 volt reference
circuit for an open or short to ground.
3. If the 5 volt reference circuit is open or shorted to
ground, repair it as necessary.
Was the 5 volt reference circuit open or shorted to
ground?
7 Check the 5 volt reference circuit for a poor connection
at the PCM and replace the terminal if necessary.
Did the terminal require replacement?
Action
If DTC P0107 cannot be duplicated, the information
included in the Failure Records data can be useful in
determining vehicle mileage since the DTC was last set.
If it is determined that the DTC occurs intermittently,
performing the DTC P0107 Diagnostic Chart may isolate
the cause of the fault.
Value(s)
— Go to Step 2
0 V 11 kPa
Go to Step 4
at sea level
— Go to Step 4
Go to Step 10
5 V 104 kPa
Go to Step 6
5 V 104 kPa
— Verify repair
— Verify repair
Yes No
Go to OBD
System
Check
Go to Step 3
Refer to
Diagnostic
Aids
Go to Step 5
Go to Step 8
Go to Step 7
Go to Step 11