Isuzu 1999 RODEO Workshop Manual page 946

Reviewing the Failure Records vehicle mileage since the
diagnostic test last failed may help to determine how often
the condition that caused the Diagnostic Trouble Code to
DTC P1122 – TP Sensor 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 and/or P0462 also set?
4 Check for a poor 5 volt reference 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 short to
ground.
Was a problem found?
6 Check for an intermittent short to ground on the 5 volt
reference circuit between the PCM and the following
components:
f
Fuel Tank Vapor Pressure Sensor
f
MAP Sensor
Was a problem found?
7 Check for a poor 5 volt reference 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 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 circuit and/or the TP signal circuit
as necessary.
Is the action complete?
10 Repair intermittent open/short circuit in wiring harness
as necessary.
Is the action complete?
RODEO X22SE 2.2L ENGINE DRIVEABILITY AND EMISSION
Action
be set occurs. This may assist in diagnosing the
condition.
Value(s)
— Go to Step 2
Go to DTC
—
P0122 first
— Go to Step 6
— Go to Step 9
Go to Step
—
— Go to Step 9
— Go to Step 9
Go to Step
—
complete. If a
driveability
symptom still
exists, refer
to Symptoms.
—
complete. If a
driveability
symptom still
exists, refer
to Symptoms.
—
6E1–319
Yes No
Go to OBD
System
Check
Go to Step 3
Go to Step 4
Go to Step 5
Go to Step 8
10
Go to Step 8
Go to Step 8
Refer to
Diagnostic
Aids
10
Repair
—
Repair
—