Isuzu 1999 RODEO Workshop Manual page 757

6E1–130 RODEO X22SE 2.2L ENGINE DRIVEABILITY AND EMISSION
Diagnostic Trouble Code was last set. If it is determined
that the Diagnostic Trouble Code occurs intermittently,
performing the DTC P1115 Diagnostic Chart may isolate
the cause of the fault.
Test Description
Number(s) below refer to the step number(s) on the
Diagnostic Chart:
2.Verifies that the fault is present.
3.If Diagnostic Trouble Code P0118 can be repeated
only by duplicating the Failure Records condition,
refer to the "Temperature vs. Resistance Value"
table.
The table may be used to test the ECT sensor at
various temperatures to evaluate the possibility of
a "shifted" sensor that may be shorted above or
below a certain temperature. If this is the case,
replace the ECT sensor. If the ECT sensor
appears to be OK, the fault is intermittent; refer to
Diagnostic Aids.
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 the "DTC" info for
Diagnostic Trouble Code P0118.
Does the Tech 2 indicate Diagnostic Trouble Code
P0118 failed?
4 1. Disconnect the ECT sensor electrical connector.
2. Jumper the ECT signal circuit and the sensor
ground circuit together at the ECT sensor harness
connector.
3. Observe the "Eng Cool Temp" display on the Tech 2.
Is the "Eng Cool Temp" at or above the specified value?
5 1. Jumper the ECT signal circuit at the ECT sensor
harness connector to chassis ground.
2. Observe the "Eng Cool Temp" display on the Tech 2.
Is the "Eng Cool Temp" at or above the specified value?
6 Check for poor connections at the ECT sensor and
replace terminals if necessary.
Did any terminals require replacement?
DTC P118 – ECT Sensor Circuit High Input
Action
Intake Air Temperature Sensor
°C
Temperature vs. Resistance Values (approximate)
100
80
60
45
35
25
15
5
–5
–15
–30
–40
Value(s)
— Go to Step 2
–39°C
(–38°F) Go to Step 4
Refer to Test
—
Description
140°C
(284°F) Go to Step 6
140°C
(284°F) Go to Step 7
— Verify repair
°F
OHMS
212 177
176 332
140 667
113 1188
95 1802
77 2796
59 4450
41 7280
23 12300
5 21450
–22 52700
–40 100700
Yes No
Go to OBD
System
Check
Go to Step 3
Refer to
Diagnostic
Aids
Go to Step 5
Go to Step 8
Go to Step
10