Isuzu 1999 RODEO Workshop Manual page 755

6E1–128 RODEO X22SE 2.2L ENGINE DRIVEABILITY AND EMISSION
DTC P0117 – Engine Coolant Temperature (ECT) Sensor Circuit Low Input
Step
1 Was the "On–Board Diagnostic (OBD) System Check"
performed?
2 1. Ignition ON engine OFF.
2. Observe the "Eng Cool Temp" display on the Tech 2.
Is the "Eng Cool Temp" 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 "DTC" info for DTC P0117.
Does the Tech 2 indicate DTC P0117 failed this
ignition?
4 1. Disconnect the ECT sensor electrical connector.
2. Observe the "Eng Cool Temp" display on the Tech 2.
Is the "Eng Cool Temp" at or below the specified value?
5 1. Ignition OFF.
2. Disconnect the PCM and check the ECT signal
circuit for a short to ground or a short to the sensor
ground circuit.
3. If the ECT signal circuit is shorted, repair it as
necessary.
Was the ECT signal circuit shorted to ground?
6 Replace the ECT sensor.
Is the action complete?
7 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.
Is the action complete?
Action
replacement PCM must
Module and Sensors
Value(s)
— Go to Step 2
139°C
(282°F) Go to Step 4
— Go to Step 4
–39°C
(–38°F) Go to Step 6
— Verify repair
— Verify repair
be
for
— Verify repair
Yes No
Go to OBD
System
Check
Go to Step 3
Refer to
Diagnostic
Aids
Go to Step 5
Go to Step 7
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—