|
- Item 21: Engine coolant temperature sensor
|
|
OK:
Engine
cold state: At ambient temperature (atmospheric
temperature) or equivalent. Engine hot state: At
80 - 120°C
|
|
Q.
Is the check result normal?
|
|
Intermittent
malfunction (Refer to GROUP 00 - How to Use
Troubleshooting/Inspection Service Points ).
|
|
|
![](../../../img/13/AK305835AB00ENG.png)
|
Q.
Is the check result normal?
Go to Step 3
.
Repair or
replace.
|
![](../../../img/13/AK305835AB00ENG.png)
|
- Disconnect connector, and measure at sensor
side.
- Resistance between terminal No. 1 and No.
2.
OK:
Engine coolant temperature
at -20°C: 14 - 17
kΩ Engine coolant temperature at 0°C:
5.1 - 6.5 kΩ Engine coolant
temperature at 20°C: 2.1 - 2.7
kΩ Engine coolant temperature at
40°C: 0.9 - 1.3 kΩ Engine
coolant temperature at 60°C: 0.48 - 0.68
kΩ Engine coolant temperature at
80°C: 0.26 - 0.36
kΩ
Q.
Is the check result normal?
Go to Step 4
.
Replace
engine coolant temperature sensor.
|
![](../../../img/13/AK305835AB00ENG.png)
|
- Disconnect connector and measure at harness
side.
- Voltage between terminal No. 2 and earth.
OK: 2 Ω or less
Q.
Is the check result normal?
Go to Step 8
.
Go to Step 5
.
|
|
Q.
Is the check result normal?
|
![](../../../img/13/AK305833AB00ENG.png)
|
Go to Step 6
.
Repair or
replace.
|
![](../../../img/13/AK305835AB00ENG.png)
![](../../../img/13/AK305833AB00ENG.png)
|
note |
Before checking harness, check
intermediate connector C-116, and repair if
necessary.
|
- Check earthing line for open circuit and
damage.
Q.
Is the check result normal?
Go to Step 7
.
Repair.
|
|
- Item 21: Engine coolant temperature sensor
|
|
OK:
Engine
cold state: At ambient temperature (atmospheric
temperature) or equivalent. Engine hot state: At
80 - 120 °C
|
|
Q.
Is the check result normal?
|
|
Intermittent
malfunction (Refer to GROUP 00 - How to Use
Troubleshooting/Inspection Service Points ).
|
|
|
![](../../../img/13/AK305835AB00ENG.png)
|
- Disconnect connector, and measure at harness
side.
- Ignition switch: ON
- Voltage between terminal No. 1 and earth.
OK: 4.5 - 4.9 V
Q.
Is the check result normal?
Go to Step
13 .
Go to Step 9
.
|
![](../../../img/13/AK305833AB00ENG.png)
![](../../../img/13/AK305835AB00ENG.png)
|
- Measure engine-A/T-ECU terminal voltage.
- Disconnect B-08 engine coolant temperature
sensor.
- Ignition switch: ON
- Voltage between terminal No. 98 and earth.
OK: 4.5 - 4.9 V
Q.
Is the check result normal?
Go to Step
10 .
Go to Step
11 .
|
![](../../../img/13/AK305833AB00ENG.png)
![](../../../img/13/AK305835AB00ENG.png)
|
Q.
Is the check result normal?
![](../../../buttons/03btn001.png)
Check
and repair harness between B-08 (terminal No. 1) engine
coolant temperature sensor connector and C-113 (terminal
No. 98) engine-A/T-ECU connector.
- Check output line for open
circuit.
Repair or
replace.
|
![](../../../img/13/AK305833AB00ENG.png)
|
Q.
Is the check result normal?
Go to Step
12 .
Repair
or replace.
|
![](../../../img/13/AK305835AB00ENG.png)
![](../../../img/13/AK305833AB00ENG.png)
|
- Check output line for short circuit.
Q.
Is the check result normal?
Go to Step 7
.
Repair.
|
![](../../../img/13/AK305835AB00ENG.png)
|
- Use special tool test harness (MB991709) to connect
connector, and measure at pick-up harness.
- Ignition switch: ON
- Voltage between terminal No. 1 and earth.
OK:
Engine coolant temperature
at -20°C: 3.9 - 4.5 V Engine
coolant temperature at 0°C: 3.2 - 3.8
V Engine coolant temperature at 20°C: 2.3
- 2.9 V Engine coolant temperature at
40°C: 1.3 - 1.9 V Engine coolant
temperature at 60°C: 0.7 - 1.3
V Engine coolant temperature at 80°C: 0.3
- 0.9 V
Q.
Is the check result normal?
Go to Step 7
.
Go to Step
14 .
|
![](../../../img/13/AK305833AB00ENG.png)
|
Q.
Is the check result normal?
Go to Step
15 .
Repair
or replace.
|
![](../../../img/13/AK305835AB00ENG.png)
![](../../../img/13/AK305833AB00ENG.png)
|
- Check output line for damage.
Q.
Is the check result normal?
Go to Step 7
.
Repair.
|