Isuzu 1999 RODEO Workshop Manual page 763

6E1–136 RODEO X22SE 2.2L ENGINE DRIVEABILITY AND EMISSION
If Diagnostic Trouble Code P0122 cannot be duplicated,
the information included in the Failure Records data can
be useful in determining vehicle mileage since the
Diagnostic Trouble Code was last set. If it is determined
Step
1 Was the "On–Board Diagnostic (OBD) System Check"
performed?
2 1. Ignition ON engine OFF.
2. With the throttle closed, observe the "Throttle
Position Sensor" display on the Tech 2.
Is the "Throttle Position Sensor" below 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 the "Diagnostic Trouble
Code" info for Diagnostic Trouble Code P0122.
Does the Tech 2 indicate DTC P0122 failed?
4 1. Ignition OFF.
2. Disconnect the TP sensor electrical connector.
3. Jumper the 5 volt reference circuit and the Throttle
Position signal together at the Throttle Position
sensor harness connector.
4. Ignition ON.
Observe the "Throtle Position Sensor" display on the
Tech 2.
Is the "Throttle Position Sensor" at the specified value?
5 1. Disconnect jumper.
2. Connect a test light between B+ and the Throttle
Position sensor signal circuit at the Throttle Position
sensor harness connector.
Observe the "Throttle Position Sensor" display on the
Tech 2.
Is the "Throttle Position Sensor" at the specified value?
(if no, start with the diagnosis chart for other sensors in
the circuit and see if 5V returns.)
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?
DTC P0122 – TP Sensor Circuit Low Input
Action
that the Diagnostic Trouble Code occurs intermittently,
performing the Diagnostic
Diagnostic Chart may isolate the cause of the fault.
Value(s)
— Go to Step 2
0.22 V Go to Step 4
— Go to Step 4
Go to Step
5 V
5 V Go to Step 6
— Verify repair
— Verify repair
Trouble Code P1122
Yes No
Go to OBD
System
Check
Go to Step 3
Refer to
Diagnostic
Aids
10 Go to Step 5
Go to Step 8
Go to Step 7
Go to Step
12