Test Requirements
- the fuses OK.
- Battery voltage at least 12.5 volts.
- All electrical consumers such as, lights and rear window defroster, switched off.
- Vehicles with automatic transmission, shift selector lever into position "P" or "N".
- A/C switched off.
- Ground connections between engine/transmission/chassis OK.
- Switch the Ignition Off.
- Engine cold.
Start diagnosis
Prior to repair work, perform a preliminary check to verify the condition. Refer to PRELIMINARY CHECK .
Engine must be at room temperature.
-- Connect the scan tool.
-- Switch the ignition on.
-- Using the scan tool, Check the coolant temperature:
| Diagnostic text | Specified value | |||
|---|---|---|---|---|
| Engine Coolant Temperature Sensor On Radiator Outlet | Approx. ambient temperature | |||
If the specified value was obtained:
-- Start the engine and let it run at idle.
the temperature value must increase uniformly in increments of approximately 1.0°C.
If the engine shows problems in certain temperature ranges and if the temperature does not climb uniformly, the temperature signal is intermittent.
-- Replace the Engine Coolant Temperature Sensor On Radiator Outlet -G83-. Refer to the Repair Information.
If the specified value was Not obtained:
Checking internal resistance
-- Disconnect the Engine Coolant Temperature Sensor On Radiator Outlet -G83- electrical harness connector (located on the lower radiator hose at the engine connection).
-- Using a multimeter, Check the Engine Coolant Temperature Sensor On Radiator Outlet -G83- terminals 1 to 2 for resistance.
Use the chart below for the specified values:
Specified value:
| ECT Temperature vs Resistance | ||
| 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 values were Not obtained:
-- Replace the Engine Coolant Temperature Sensor On Radiator Outlet -G83-. Refer to the Repair Information.
If the specified values were obtained: