Dtc P1107 - Map Sensor Circuit Intermittent Low Voltage - Isuzu Trooper 1999 Workshop Manual

and wiring harnesses related to the sensor. A change
in the display will indicate the location of the fault.
Reviewing the Failure Records vehicle mileage since the
diagnostic test last failed may help determine how often
DTC P1107 – MAP Sensor Circuit Intermittent Low Voltage
Step
1 Was the "On-Board Diagnostic (OBD) System Check"
performed?
2 Is DTC P0107 also set?
3 Is DTC P1122 also set?
4 Check for a poor 5 volt reference "A" circuit or MAP
signal circuit terminal connection at the MAP sensor.
Was a problem found?
5 Check the MAP signal circuit between the MAP sensor
connector and the PCM for an intermittent open or
short to ground.
Was a problem found?
6 Check for an intermittent short to ground on the 5 volt
reference "A" circuit between the PCM and the
following components:
f
MAP sensor
f
EGR valve
f
TP sensor
Was a problem found?
7 Check for a poor 5 volt reference "A" terminal
connection at the PCM.
Was a problem found?
8 Check for an intermittent open or a faulty splice in the 5
volt reference "A" circuit.
Was a problem found? (If no, start with the diagnosis
chart for other sensors in the circuit and see if 5V
returns.)
9 Replace the faulty harness connector terminal(s) for
the 5 volt reference "A" circuit and/or the MAP signal
circuit as necessary.
Is the action complete?
10 Repair intermittent open/short circuit in the wiring
harness as necessary.
Is the action complete?
TROOPER 6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Action
the condition that caused the DTC to be set occurs. This
may assist in diagnosing the condition.
Value(s)
Go to Step 2
—
Go to DTC
P0107 chart
—
— Go to Step 6
— Go to Step 9
— Go to Step 10
— Go to Step 10
— Go to Step 9
— Go to Step 10
— Verify repair
— Verify repair
6E–377
Yes No
Go to OBD
System
Check
first Go to Step 3
Go to Step 4
Go to Step 5
Go to Step 8
Go to Step 7
Go to Step 8
Refer to
Diagnostic
Aids
—
—