Fault Code 0300

Fault Code 0300/P0711/P0712/P0713

ATF temperature sensor [Transmission Fluid Temperature Sensor A Circuit Low/High/Range/Performance]

NOTE: The ignition must be switched off and then switched on again in order to display a fault indication in the instrument cluster.

Use the Actual values menu in the Porsche System Tester II 9588 to check the transmission status and the actual values of the shift solenoid valves and sensors.

Diagnostic conditions

NOTE: The ATF fluid level in the transmission must be OK and the specified ATF fluid must be used. The ATF filter and cooler must not be blocked.

The following requirements are met for at least 0.5 seconds:
- Voltage greater than 10.2 V and less than 15.5 V
- Ignition on
- Internal Tiptronic control unit function test was completed successfully
- Engine running without malfunction, speed greater than 400 rpm

The fault types open circuit/short circuit to B+ (CODE: P0712) are set after the following conditions occur 12 times:

NOTE: The value obtained before the fault is set is used as a substitute value.

- Engine temperature normal
- Tiptronic control not in limp-home mode
- Vehicle driving time greater than 10 min
- The value obtained corresponds to the minimum value - 43 degree C for more than 1 second

The fault type short circuit to ground (CODE: P0713) is set after the following conditions occur 30 times:

NOTE: The value obtained before the fault is set is used as a substitute value.

- The value obtained corresponds to the maximum value 200 degree C for more than 10 seconds

The fault type implausible signal (CODE: P0711) is set after the following conditions occur once:
- Selector lever position D, R
- ATF temperature during initialisation phase less than 30 degree C
- ATF temperature during initialisation phase = maximum ATF temperature during a 15 min period ± 5 degree C

Possible causes of fault

NOTE: The Diagnosis/troubleshooting shown below is adapted to suit the fault type displayed in the tester (please note fault type numbering 1, 2,... etc..). The fault memory Info key F8 on the Porsche System Tester II 9588 can be used to read out the fault type in the extended fault memory.

1. open circuit/short circuit to B+: ATF temperature sensor sticks in lower temperature range
2. Short circuit to ground: ATF temperature sensor sticks in upper temperature range
3. implausible signal: ATF temperature sensor sticks in middle temperature range

Affected pins
Tiptronic control unit plug:
- Pin 8 ATF temperature sensor ground, to existing transmission wiring plug pin B2
- Pin 45 ATF temperature sensor voltage/current, to existing transmission wiring plug pin B1

Diagnosis/troubleshooting G 0210

Wiring diagram of ATF temperature sensor







Data on ATF temperature sensor
- Sensor type: Thermistor
- Current input at 145 degree C: 2 mA
- Internal resistance at -30 degree C: 44 ± 6.6 k
- Internal resistance at 10 degree C: 6.445 ± 0.645 k
- Internal resistance at 110 degree C: 247 ± 16
- Internal resistance at 145 degree C: 111 ± 6

NOTE:
- Visual inspection: In the next troubleshooting section, please check first that the affected pins on the Tiptronic control unit plug connection and the pins on the existing transmission wiring plug connection are neither damaged nor corroded. Remove any soiling or corrosion/oxidation. Replace damaged parts/wires.
- Control unit replacement: Before replacing the Tiptronic control unit, the ground connections, power supply and plug connections on the control unit must be checked as OK. Please observe the coding of the control unit. After the test drive, read out the fault memory again with the Porsche System Tester II

DANGER:
Danger of burns from hot ATF fluid.
Skin or clothing may burn following contact with hot ATF fluid.
- Always allow ATF fluid to cool before draining.
- Wear suitable protective clothing.
- Use a suitable collecting container.

1. Troubleshooting only for fault type: Open circuit/short circuit to B+

Work Instruction 1 - 3:

Work Instruction 4 - 6:

2. Troubleshooting only for fault type: Short circuit to ground

Work Instruction 1 - 3:

Work Instruction 4 - 6:

3. Troubleshooting only for fault type: implausible signal

Work Instruction 1 - 2: