Connect a 12 to 230 ohm resistor between the connector pin and «weight» car.
Pic. 13.66. Readings of the electronic coolant temperature gauge when connected to the resistor connector with a resistance of 18 to 178 ohms
Pic. 13.67. Readings of the analog coolant temperature gauge on models with a tachometer when connected to the resistor connector with a resistance of 12.4 to 233 ohms
Pic. 13.68. Readings of the analog coolant temperature gauge on models without a tachometer when connected to the resistor connector with a resistance of 12.4 to 233 ohms
Check that the wires are not touching «masses» vehicle and turn on the ignition. Wait 2 minutes for the pointer readings to stabilize, then, guided by fig. 13.66, 13.67, 13.68, compare the actual pointer readings with the expected ones.
If possible, repeat the test with other resistance resistors within the specified limits. Switch off the ignition before replacing the resistors.
If the temperature gauge shows the maximum or minimum temperature, regardless of the resistance of the resistor, there is a short or open in the sensor wires. Otherwise, incorrect readings are caused by a malfunction of the coolant temperature gauge itself.