Codes P0722, P0730 and P0741

PHILIP TOLENTINO

MEMBER
2000 SAAB 9-5
3.0L
V6
2WD
AUTOMATIC
123,000 MILES

I scanned for codes and received three codes. P0722-Out put speed sensor
P0730-Incorrect Gear Ratio
P0741-Torque converter clutch circuit performance stuck off

This is my son's car. He claims that when driving the transmission it is slipping. I check the transmission oil level and it appears to be okay.
It also has a bad engine oil leak somewhere. I have priced having a rebuilt transmission installed and it's very expensive which he cannot afford. I am his father and I would like to help him repair this unless the transmission needs to be rebuilt or buy a used transmission. These seem to be electronic parts but I do not know where they are or how to replace them. If I had some guidance I am willing to try. Please help.
Phil T.

3 Replies

4DRTOM

MECHANIC
467 POSTS

Hello,

Sounds like a big job here is the overview on the transmission with the solemnized list getting at them could be challenging but possible. How are you with wrenches and what stage of the project will help the most? Are you able to get the unit out? I can get the information from the point you want to start just let me know.
Tom

The automatic transmission consists of the following principal components:

1. Gearbox
2. Control module, (TCM) 502
3. Solenoid valves for shifting, (S1 and S2) 531
4. Solenoid valve for Lock-up, (SL) 531
5. Solenoid valve for system pressure, (ST) 531
6. Input shaft speed sensor, 532
7. Output shaft speed sensor, 533
8. Transmission fluid temperature sensor 535
9. Gear selector position sensor 24'

Transmission range switch (245)
Main instrument unit (540)
Control module, Trionic (430/600)
SID (541)
Control module, TCM (502)
Switch, WINTER (506)
Switch, SPORT (537)
Output shaft speed sensor (533)
Input shaft speed sensor (532)
Transmission fluid temperature sensor (535
Control module, TWICE (632)
Lock-up solenoid (SL)
Solenoid for shifting (S1)
Solenoid for shifting (S2)
Solenoid for system pressure (ST)

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Monday, August 10th, 2020 AT 10:17 PM

PHILIP TOLENTINO

MEMBER
2 POSTS

Is the out put speed sensor and in put speed sensor inside the transmission or attached to the out side?

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Tuesday, August 11th, 2020 AT 8:36 AM

4DRTOM

MECHANIC
467 POSTS

Hi Philip,

The output speed sensor is mounted in the transmission casing. It provides the control module with information on the speed of the transmission's output shaft on pin 15. The sensor is grounded via pin 30.
The sensor is of electromagnetic (inductive) type and measures the output speed by means of pulses generated by an 18-toothed wheel (parking lock ring gear). The control module uses the frequency of the pulses to calculate the output speed. Sensor voltage increases with increasing engine speed. At 30 km/h the voltage is approximately 1.2 V AC.
Resistance between the pins is 300 - 600 Ohm.
The input speed sensor is mounted in the transmission casing. It provides the control module with information on the speed of the transmission's input shaft on pin 45. The sensor is grounded via pin 44.
The sensor is of electromagnetic (inductive) type and measures the input speed after the torque converter (turbine rpm) by means of pulses generated by a 12-toothed wheel (C1 clutch drum). The control module uses the frequency of the pulses to calculate the input speed. Sensor voltage increases with increasing engine speed. At idling speed the voltage is approximately 1.2-1.4 V AC and at 2500 rpm 2.2 V AC.
Resistance between the pins is 300 - 600 Ohm.
Tom

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Wednesday, August 12th, 2020 AT 11:28 PM