Isuzu 1999 RODEO Workshop Manual page 770

DTC P0125 Insufficient Coolant Temperature for Closed Loop Fuel Control
Step
6 Compare engine coolant temperature displayed on the
Tech 2 to the actual coolant temperature measured
with a thermometer. (Observe normal precautions
when opening the cooling system.)
Is the Tech 2 engine coolant temperature indication
close to the measured temperature?
7 1. Ignition OFF.
2. Disconnect the PCM.
3. Using a DVM, measure the resistance of the ECT at
the PCM connector.
4. Compare the DVM reading with the chart in "Test
Description."
Is the chart value approximately equal to the
thermometer reading?
8 Check for the following conditions in the wiring between
the ECT and the PCM:
f
An open circuit
f
A short to ground
f
A short to voltage
9 Refer to Cooling and Radiator for cooling system
diagnosis and repair condition as necessary.
Is the action complete?
10 Replace the faulty terminal(s) or repair faulty wiring as
necessary.
Is the action complete?
11 Replace the ECT sensor.
Is the action complete?
12 Replace the PCM.
IMPORTANT: The
programmed.
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.
Is the action complete?
RODEO X22SE 2.2L ENGINE DRIVEABILITY AND EMISSION
(Cont'd)
Action
replacement PCM
Refer to On–Vehicle Service in
Module and Sensors
Value(s)
—
—
—
—
—
—
must be
for
—
6E1–143
Yes No
Go to Step 9 Go to Step 7
Go to Step 12
Go to Step 8
Go to Step 10 Go to Step 11
Verify Repair —
Verify Repair —
Verify Repair —
Verify Repair —