Test Procedure

-- Perform a preliminary check to verify the customers complaint. Refer to PRELIMINARY CHECK 

Start diagnosis

-- Connect the scan tool.

-- Switch the ignition On.

-- Using the scan tool, check the coolant temperature:

Diagnostic text		Specified value
Coolant temperature		near Ambient temperature (veh. completely cooled down)

-- Switch the ignition Off.

If the specified value was Not obtained:

-- Continue test according to the following table:

Indicated	Cause	Test
approx. - 40.0° C	Open circuit or short circuit to (B+)	Testing If Display Is Approx. - 40.0°C
approx. 140.0° C	Short circuit to Ground	Testing If Display Approx. 140.0°C

If the specified value was obtained:

-- Start the engine and let it run at idle.

The temperature value must increase uniformly in increments of 1.0° C.

If the engine shows problems in certain temperature ranges, if the temperature does not climb uniformly or the temperature signal is intermittent.

-- Switch the ignition OFF.

-- Replace the Engine Coolant Temperature (ECT) Sensor - G62 or G83-.

Checking internal resistance

-- Disconnect the Engine Coolant Temperature (ECT) Sensor -G62 or G83- electrical harness connector.

-- Using a multimeter, check the Engine Coolant Temperature (ECT) Sensor -G62 or G83- terminals 1 to 2 for resistance.

Use the chart below for the specified values:

ECT Temperature vs Resistance (approximate)
Temp (C)	min. value ohms	max value ohms
- 40	36816	43714
- 35	28840	33978
- 25	17680	20530
- 15	10940	12534
- 5	6897	7804
0	5535	6226
5	4443	4970
15	2923	3235
25	1978	2167
35	1369	1486
45	965	1039
55	692	738
65	503	533
75	372	392
85	279	292
95	213	223
105	164	172
115	127	134
125	99	106
135	78	84

If the specified value was Not obtained:

-- Replace the Engine Coolant Temperature (ECT) Sensor -G62 or G83-.