Test Point 25

TEST POINT 25
Transmission Temperature Sensor Open Circuit/Short To Plus

DTC 37

Fault Effect: - Reduced driving program.
- Substitute value of 80 °C for ATF temperature.
- No activation of the coolant switchover valve (transmission always cooled).

Notes:
- The ATF temperature can be tested with the Porsche System Tester 2 (Actual values/Transmission temp.).
- A fault is stored if an ATF temperature outside the limit range below - 50 °C or above + 180 °C is detected.

1. Check ATF level.

2. Check sender for ATF temperature with wiring. To do this, connect an ohmmeter to control module connector pins 21 and 22.

Nominal value:
At 20 °C approx. 1.00 kohms
At 40 °C approx. 1.15 kohms
At 60 °C approx. 1.30 kohms

3. Check wiring from control module connector pin 21 (or 22) to the l6pole transmission connector pin 14 (or 13) for continuity, short circuit to ground and short to B+.

4. Test sender for ATF temperature with transmission wiring harness. To do this, connect an ohmmeter to transmission socket pin 13 and pin 14.

Nominal value:
At 20 °C approx. 1.00 kohms
At 40 °C approx. 1.15 kohms
At 60 °C approx. 1.30 kohms

If the nominal value is not OK, the transmission wiring harness or sender for the ATF temperature is defective.

Note:
As the sender for the ATF temperature is integrated in the transmission wiring harness, the transmission wiring harness must be replaced if the sender is damaged.