Isuzu 1999 RODEO Workshop Manual page 1618

caused the DTC to be set occurs. This may assist in
diagnosing the condition.
DTC P1121 –TP Sensor Circuit Intermittent High Voltage
Step
1 Was the "On-Board Diagnostic (OBD) System Check"
performed?
2 Is DTC P0123 also set?
3 Is DTC P1111, P1115, and/or P1106 also set?
4 Check for a poor sensor ground 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
voltage.
Was a problem found?
6 Check for an intermittent short to voltage 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 sensor ground terminal connection at
the PCM.
Was a problem found?
8 Check for an intermittent open or a faulty splice in the
sensor ground 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 for the
sensor ground circuit.
Is the action complete?
10 Repair 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
— P0123 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
— Verify repair
— Verify repair
6E2–375
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
—
—