Isuzu 1999 RODEO Workshop Manual page 761

6E1–134 RODEO X22SE 2.2L ENGINE DRIVEABILITY AND EMISSION
DTC P0121 TP Sensor/Range Performance Problem (Cont'd)
Step
7 Check the 5 volt signal circuit, between the TP sensor
and the PCM, for the following conditions:
f
An open circuit
f
A short to ground
f
A short to voltage
Was the problem found?
8 1. Ignition OFF.
2. Place a fused jumper between the TP sensor circuit
and the 5 volt signal circuit both at the wiring
harness' TP sensor connector.
3. Ignition ON, Engine OFF.
4. Observe the TP value displayed on the Tech 2?
Does the Tech 2 read the following value?
9 Check the TP sensor ground circuit, between the TP
sensor and the PCM, for the following conditions:
f
An open circuit
f
A short to ground
f
A short to voltage
Was the problem found?
10 1. Ignition OFF.
2. Place a Digital Multimeter (DVM), set to measure
voltage, between the ground circuit and the 5 volt
signal circuit, both at the wiring harness' TP sensor
connector.
3. Ignition ON, Engine OFF.
Does the DVM read the following value?
11 Replace the TP sensor.
Verify repair.
12 Replace the PCM.
IMPORTANT: The
programmed. Refer to On–Vehicle Service in
Powertrain Control
procedures.
And also refer to latest Service Bulletin.
Check to see if the Latest software is released or not.
And then Down Load the LATEST PROGRAMMED
SOFTWARE to the replacement PCM.
Verify repair.
Action
replacement PCM must
Module and Sensors
Value(s)
— Verify repair
about 5 volts
100% Go to Step 9
— Verify repair
Go to Step 11
about 5 volts
—
be
for
—
Yes No
Go to Step 8
Go to Step 12
Go to Step 10
Go to Step 12
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— —