Isuzu 2000 Trooper Workshop Manual page 1030

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 DTC P0118 can be repeated only by duplicating
the Failure Records conditions, 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 .
DTC P0118 – ECT Sensor Circuit High Voltage
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 DTC
P0118.
Does the Tech 2 indicate DTC 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 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 the specified value?
6 Check for poor connections at the ECT sensor and
replace terminals if necessary.
Did any terminals require replacement?
TROOPER 6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Action
Engine Coolant 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
Go to Step 7
(284°F)
— Verify repair
6E–161
°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