Isuzu N-Series. Manual — part 458
6E-168 EMISSION AND ELECTRICAL DIAGNOSIS
Measure Resistance at Engine Coolant Temperature (ECT) Sensor
Caution:
When measuring resistance with a circuit tester, be careful not to damage or deform the terminals.
Resistance value
Notice:
Resistance value is difference according to the temperature of temperature sensor.
Connector No
Signal
1
Thermistor for engine
2
Thermistor for engine
3
Thermistor for meter
Legend
1. Circuit tester
3. Engine coolant temperature sensor
2. Remove engine wire harness
4. Measure resistance between connector pin
Inspection Point
Resistance
Value
Temperature
on sensor
Reference
Connector
Pin No.
3 pin Black
1
←→ 3
∞
—
Thermistor for ENGINE
←→ Thermistor for meter
1
←→ 2
2.5 (k
Ω)
20
°C (68°F)
Thermistor for ENGINE
247 (
Ω)
90
°C (194°F)
1
←→ Body
∞
—
Thermistor for ENGINE
←→ Body
2
←→ 3
∞
—
Thermistor for ENGINE
←→ Thermistor for meter
3
←→ Body
146.6 (
Ω)
60
°C (140°F) Thermistor for meter ENGINE
2
←→ Body
∞
—
Thermistor for ECM
←→ Body
N6A1162E
EMISSION AND ELECTRICAL DIAGNOSIS 6E-169
Step
Action
Value
YES
NO
1
Was the “Diagnostic system check” per-
formed?
—
Go to self diagnos-
tic system check
2
1. Ignition “OFF”
2. Disconnect the ECT sensor electrical con-
nector.
3. Jumper the ECT sensor signal circuit and
the ECT sensor ground circuit together at
the ECT sensor harness connector.
Does indicate DTC 13?
—
3
1. Ignition “OFF”
2. Jumper the ECT signal circuit at the ECT
sensor harness connector to chassis
ground.
Does indicate DTC 13?
—
4
Check four poor connection at the ECT sensor
and replace terminals if necessary.
Did any terminals require replacement?
—
5
1. Ignition “OFF”.
2. Disconnect the ECM, and check the ECT
sensor ground circuit for an open.
3. If the ECT sensor ground circuit is open,
repair it as necessary.
Was the ECT sensor ground circuit open?
—
6
1. Ignition “OFF”.
2. Disconnect the ECM, and check the ECT
sensor signal circuit for an open.
3. If the ECT signal circuit is open, repair it
as necessary.
Was the ECT sensor signal circuit open?
—
7
Check for poor sensor ground or ECT sensor
signal circuit terminal connection at the ECU
and replace terminal(s) if necessary.
Did any of the terminals need to be replaced?
—
8
1. Ignition “OFF”
2. Replace the ECT Sensor.
Is the action complete?
—
—
9
1. Replace the ECM.
Is the action complete?
—
—
10
1. Reconnect all the connectors removed.
2. Ignition “ON”, Engine “OFF”
Does DTC 13 come normal condition?
—
11
Is any current trouble other than DTC 13 dis-
played by indicator light?
—
Go to trouble code
section
Trouble code clear
6E-170 EMISSION AND ELECTRICAL DIAGNOSIS
DTC-14 Engine Coolant Temperature (ECT) Sensor Circuit Low Voltage
Appearance of Water Temperature Sensor and
Connector Pin Assignment
Temperature Sensor
Connector Pin Assignment
N6A1315E
Legend
1. 3 pin connector
2. Engine coolant temperature sensor
N6A1160E
Legend
1. To ECT sensor
2. 3 pin gray
N6A1161E
EMISSION AND ELECTRICAL DIAGNOSIS 6E-171
Measure Resistance at Engine Coolant Temperature (ECT) Sensor
Caution:
When measuring resistance with a circuit tester, be careful not to damage or deform the terminals.
Resistance value
Notice:
Resistance value is difference according to the temperature of temperature sensor.
Connector No
Signal
1
Thermistor for engine
2
Thermistor for engine
3
Thermistor for meter
Legend
1. Circuit tester
3. Engine coolant temperature sensor
2. Remove engine wire harness
4. Measure resistance between connector pin
Inspection Point
Resistance
Value
Temperature
on sensor
Reference
Connector
Pin No.
3 pin Black
1
←→ 3
∞
—
Thermistor for ENGINE
←→ Thermistor for meter
1
←→ 2
2.5 (k
Ω)
20
°C (68°F)
Thermistor for ENGINE
247 (
Ω)
90
°C (194°F)
1
←→ Body
∞
—
Thermistor for ENGINE
←→ Body
2
←→ 3
∞
—
Thermistor for ENGINE
←→ Thermistor for meter
3
←→ Body
146.6 (
Ω)
60
°C (140°F) Thermistor for meter ENGINE
2
←→ Body
∞
—
Thermistor for ECM
←→ Body
N6A1162E
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