Isuzu 1999 RODEO Workshop Manual page 1620

DTC P1122 –TP Circuit Intermittent Low Voltage
Step
1 Was the "On-Board Diagnostic (OBD) System Check"
performed?
2 Is DTC P0122 also set?
3 Is DTC P1107 also set?
4 Check for a poor 5 volt reference "A" circuit or TP signal
circuit terminal connection at the TP sensor.
Was a problem found?
5 Check the TP signal circuit between the TP 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" circuit 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 TP signal
circuit as necessary.
Is the action complete?
10 Repair the intermittent open/short circuit in wiring
harness as necessary.
Is the action complete?
RODEO 6VD1 3.2L ENGINE DRIVEABILITY AND EMISSIONS
Action Value(s) Yes
— Go to Step 2
Go to DTC
— P0122 first
— Go to Step 6
Go to Step 9
—
— Go to Step 10
Go to Step 10
—
— Go to Step 9
Go to Step 10
—
Repair
complete. If
a driveability
symptom still
exists, refer
— to Symptoms .
Repair
complete. If
a driveability
symptom still
exists, refer
— to Symptoms .
6E2–377
No
Go to OBD
System
Check
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
—
—