Warm up the engine to operating temperature until the cooling fan turns on.
Measure the voltage between 7 (Yellow/Green (+)) and 32 (black (-)) contacts.
If the voltage is approximately 1 V, then the TW sensor is normal.
Otherwise, turn off the ignition.
Next, disconnect the 7-pin connector from the right front of the engine compartment.
Turn on the ignition.
Measure the voltage between 7 (Yellow/Green (+)) and 32 (black (-)) contacts.
If the voltage is not approximately 5 V, then the control unit should be replaced and rechecked.
If the voltage is approximately 5V, then measure the resistance between the Yellow/White and Black terminals on the main engine wiring harness.
If the resistance does not fall within the range of 200-400 ohms, then you should check for an open or short circuit Yellow / White and Black conductors between the TW sensor and the 7-pin connector. If the conductors are OK, then the TW sensor must be replaced.
If the resistance falls in the range of 200-400 ohms, then you should measure the voltage between Yellow / Green (+) terminal on the main engine wiring harness and ground.
If the voltage is approximately 5V, repair the break in the Black wire between the 7-pin connector and point G2.
Otherwise, repair the open or short in the Yellow/Green wire between the 7-pin connector and terminal 7 of the control unit.