Isuzu KB P190. Manual - part 885

Engine Management – V6 – Service Operations 

Page 6C1-3–16 

 

2.6 

Engine Coolant Temperature Sensor  

Remove 

 

To avoid serious personal injury, never 
remove the engine coolant temperature (ECT) 
sensor when the engine is hot. Allow the 
engine to cool to ambient temperature (less 
than 50

°°°°C) before performing this procedure. 

1 

Turn the ignition switch off. 

 

To avoid serious personal injury, never 
remove the coolant filler cap when the engine 
is hot. Allow the engine to cool to ambient 
temperature (less than 50

°°°°C) before 

performing this procedure. 

2 

Allow the engine to cool to ambient temperature less than 50

°C, and slowly remove coolant filler cap located on the 

coolant outlet housing.  

3 

Drain approximately two litres of coolant into a suitable container, refer to 6B1 – Engine Cooling – V6. 

4 

Disconnect the wiring harness connector (1) from the 
ECT sensor (2). 

Figure 6C1-3 – 12 

Engine Management – V6 – Service Operations 

Page 6C1-3–17 

 

 

Clean the area around the ECT before 
removal to avoid debris from entering the 
engine. 

5 

Remove the ECT sensor (1). 

N O T E  

If coolant leaks from the cylinder head as the 
sensor is removed, screw the sensor back into 
the cylinder head and drain more coolant from 
the cooling system. 

6 

If required, test the ECT sensor, refer to the Test in 
this Section. 

Figure 6C1-3 – 13 

Test 

 

To prevent component damage, use 

connector test adaptor kit J 35616-A. 

Resistance Check 

1 

Suspend the engine coolant temperature (ECT) sensor and a suitable thermometer in a container of 50/50 DEX-
COOL® long life coolant or equivalent and water. 

N O T E  

Neither the ECT sensor or thermometer should 
rest on the bottom of the container due to an 
uneven concentration of heat at this point when 
the container is heated. 

2 

Connect a digital ohmmeter using connector test 
adaptor kit J 35616-A to the ECT sensor. 

3 

Measure the resistance across terminals 1 and 2. 

4 

Whilst heating the container, observe the resistance 
values as the temperature increases and compare the 
temperature / resistance change to the specifications.

 

Figure 6C1-3 – 14 

Engine Management – V6 – Service Operations 

Page 6C1-3–18 

 

5 

If the resistance is not within specifications, replace 
the ECT sensor. 

 

Engine Coolant Temperature Vs Resistance 

Temperature °C

Resistance – Ohms (

Ω) 

-40 

40490 – 50136 

-20 

14096 – 16827 

-10 

8642 – 10152 

0 

5466 – 6326 

20 

2351 – 2649 

25 

1941 – 2173 

40 

1118 – 1231 

60 

573 – 618 

80 

313 – 332 

100 

182 – 191 

120 

109 – 116 

140 

68 – 74 

 

Reinstall 

Reinstallation of the engine coolant temperature (ECT) sensor is the reverse of the removal procedure, noting the 
following: 

1 

Tighten the ECT sensor to the correct torque specification. 

Engine coolant temperature sensor 
torque specification ............................................22.0 Nm 

2 

Refill the cooling system, refer to 6B1 Engine Cooling – V6. 

3 

Road test the vehicle and check for correct operation, taking particular note there is no coolant leakage. 

2.7 

Engine Control Module 

Service of the engine control module (ECM) should normally consist of either replacement or ECM programming. If the 
diagnostic procedures call for the ECM to be replaced, it should be first checked to ensure it is the correct part. If it is, 
replace the faulty ECM. 

 

Do not touch the ECM connector pins as 
electrostatic discharge (ESD) damage may 
result.  

 

When removing or reinstalling the ECM wiring 
harness connector/s, ensure the ignition 
switch is in the OFF position and the battery 
has been disconnected. Failure to do so may 
result in damage to the ECM and / or 
associated componentry. 

Disconnection of the battery affects certain 
vehicle electronic systems. Refer to 6D1-3 
Battery - V6 before disconnecting the battery. 

Engine Management – V6 – Service Operations 

Page 6C1-3–19 

 

Remove 

 

If replacing the ECM, it must be reset prior to 
removal. Failure to perform this procedure 
will result in the inability to test the ECM for 
warranty purposes, refer to ECM Reset in this 
Section. 

1 

Turn the ignition switch off. 

2 

Disconnect the battery. 

3 

Disconnect the engine harness connector (1) and the front body harness connector (2) from the ECM (3). To 
release each connector, lift the connector locking lever (4) whilst simultaneously pushing the connector locking  
slide (5), refer to Figure 6C1-3 – 15. 

 

Figure 6C1-3 – 15 

4 

Remove the screw (1) attaching the ground  
terminal (2) to the ECM (3). 

5 

Remove the bolt (4), four places, attaching the ECM to 
the mounting bracket (5) and remove the ECM. 

Figure 6C1-3 – 16