For 1990-2009 cars
Automatic Transmission Components
Automatic Transmission Controls Schematics
OBD II Symbol Description Notice
Handling ESD Sensitive Parts Notice

### Circuit Description

The 2-3 shift solenoid valve (2-3 SS Valve) controls the fluid acting on the 2-3 shift valves. The solenoid is a normally-open exhaust valve. In combination with the 1-2 Shift Solenoid Valve (1-2 SS Valve), the 2-3 SS Valve allows four different shifting combinations. The solenoid is attached to the control valve body within the transmission. Circuit 639 supplies ignition voltage to the 2-3 SS Valve. The PCM controls the solenoid by providing the ground path through circuit 1223.

If the PCM detects a continuous open or short to ground in the 2-3 SS Valve circuit or in the 2-3 SS Valve, then DTC P0758 sets. DTC P0758 is a Type A DTC.

### Conditions for Setting the DTC

• | The ignition is ON.

• | The system voltage is 9-16 volts.

• | The engine speed is greater than 500 RPM for 5 seconds, and not in fuel shut off.

• | The PCM commands the solenoid ON and the voltage remains high (B+).

• | The PCM commands the solenoid OFF and the voltage remains low (0 volts).

• | Al conditions are met for 5 seconds.

### Action Taken When the DTC Sets

• | The PCM illuminates the Malfunction Indicator Lamp (MIL).

• | The PCM commands 3rd gear.

• | The PCM commands maximum line pressure.

• | The PCM disables shift adapts.

• | The PCM inhibits Torque Converter Clutch.

### Conditions for Clearing the MIL/DTC

• | The PCM turns OFF the MIL after three consecutive trips without a failure reported.

• | A scan tool can clear the DTC from the PCM history. The PCM clears the DTC from the PCM history if the vehicle completes 40 warm-up cycles without a failure reported.

• | The PCM cancels the DTC default actions when the fault no longer exists and the ignition is OFF long enough in order to power down the PCM.

### Diagnostic Aids

• | Inspect the wiring for poor electrical connections at the PCM. Inspect the wiring for poor electrical connections at the transmission 20-way connector. Inspect the wiring for poor electrical connections at the 2-3 Shift Solenoid Valve connector. Look for the following conditions:

- | A bent terminal

- | A backed out terminal

- | A damaged terminal

- | Poor terminal tension

- | A chafed wire

- | A broken wire inside the insulation

- | Moisture Intrusion

- | Corrosion

• | When diagnosing for an intermittent short or open, massage the wiring harness while watching the test equipment for a change.

• | Ensure that the scan tool commanded gear has correct solenoid states and ratio. Refer to the Shift Solenoid Valve State and Gear Ratio table.

### Test Description

The numbers below refer to the step numbers on the diagnostic table.

1. This step isolates the fault between the engine harness and the transmission harness.

2. This step verifies that circuit 1223 is not open or shorted to power.

3. This step verifies that the 2-3 shift solenoid has neither shorted across its windings nor increased its resistance.

4. Because of the harsh conditions inside the transmission, repairing the A/T Wiring Harness is not acceptable. You must replace the A/T Wiring Harness.

#### DTC P0758 2-3 Shift Solenoid Circuit -- Electrical

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
1 | Were you sent here from the Powertrain On-Board Diagnostic (OBD) System Check? | -- | Go to Step 2 | Go to Powertrain On Board Diagnostic (OBD) System Check in Engine Controls
2 |

1. Install the Scan Tool .
2. With the engine OFF, turn the ignition switch to the RUN position.

Important: Before clearing the DTCs, use the Scan Tool in order to record the Freeze Frame and Failure Records for reference. The Clear Info function will erase the data.

3. Record the DTC Freeze Frame and Failure Records, then clear the DTC(s).

Are DTCs P0753 and P1860 set?

--

Go to Step 3

Go to Step 6

3 |

1. Remove the ENG EMIS fuse.
2. Inspect the fuse for an open.

Refer to General Electrical Diagnosis in Wiring Systems.

Did you find and correct a condition?

--

Go to Step 4

Go to Step 5

4 | Repair the short to ground in circuit 639 (PNK)/839 (RED). Refer to Wiring Repairs in Wiring Systems. Did you find and correct a condition? | -- | Go to Step 20 | --
5 | Repair open in circuit 639 (PNK)/839 (RED). Refer to Wiring Repairs in Wiring Systems. Did you find and correct a condition? | -- | Go to Step 20 | --
6 |

1. Turn the ignition switch OFF.
2. Disconnect the transmission 20-way connector.
3. Connect the J 39775 Jumper Harness on the engine harness connector.
4. Connect a test lamp from terminal E to terminal B of the J 39775 Jumper Harness.

Important: Additional DTCs will set.

5. With the engine OFF, turn the ignition switch to the RUN position.

Is the test lamp ON?

--

Go to Step 7

Go to Step 8

7 | Inspect circuit 1223 (YEL/BLK) for a short to ground. Refer to General Electrical Diagnosis in Wiring Systems. Did you find and correct a condition? | -- | Go to Step 20 | Go to Step 18
8 |

1. Select A/T Outputs, 2-3 Solenoid.
2. Cycle the 2-3 solenoid ON and OFF three times.

Does the test lamp cycle ON and OFF as you commanded?

--

Go to Step 12

Go to Step 9

9 | Inspect circuit 1223 (YEL/BLK) for an open. Refer to General Electrical Diagnosis in Wiring Systems. Did you find and correct a condition? | -- | Go to Step 20 | Go to Step 10
10 | Is the test lamp always OFF? | -- | Go to Step 11 | --
11 | Inspect circuit 1223 (YEL/BLK) for a short to power. Refer to General Electrical Diagnosis in Wiring Systems. Did you find and correct a condition? | -- | Go to Step 20 | Go to Step 18
12 |

1. Turn the ignition OFF.
2. Disconnect the J 39775 Jumper Harness from the engine harness.
3. Connect the J 39775 Jumper Harness to the transmission 20-way connector.

Refer to Automatic Transmission Inline Harness Connector End View .

4. Connect a J 39200 Digital Multimeter (DMM) set to measure ohms, from terminal E to terminal B of the J 39775 Jumper Harness.

Is the measured resistance within the specified range?

19-24 ohms at 20°C (68°F)

24-31 ohms at 88°C (190°F)

Go to Step 15

Go to Step 13

13 | Is the resistance greater than the specified value? | 100 ohms | Go to Step 14 | Go to Step 15
14 |

1. Inspect automatic transmission wiring harness circuit 839 (RED) for an open or a poor connection.
2. Inspect circuit 1223 (YEL) for an open or a poor connection.

Refer to General Electrical Diagnosis in Wiring Systems.

Did you find a condition?

--

Go to Step 19

Go to Step 17

15 | Connect a J 39200 DMM from terminal B of the J 39775 Jumper Harness to ground. Is the measured resistance less than the specified value? | 100 ohms | Go to Step 16 | Go to Step 17
16 | Inspect automatic transmission wiring harness circuit 1223 (YEL) for a short to ground. Did you find a condition? | -- | Go to Step 19 | --
17 | Replace the 2-3 Shift Solenoid. Refer to 2-3 Shift Solenoid Valve Replacement . Is the replacement complete? | -- | Go to Step 20 | --
18 | Replace the PCM. Refer to Powertrain Control Module Replacement/Programming in Engine Controls. Is the replacement complete? | -- | Go to Step 20 | --
19 | Replace the Automatic Transmission Wiring Harness. Refer to Solenoids and Wiring Harness Replacement . Is the replacement complete? | -- | Go to Step 20 | --
20 | In order to verify your repair, perform the following procedure:

1. Select DTC.
2. Select Clear Info.
3. Operate the vehicle under the following conditions:

• | The ignition switch is ON.

• | The system voltage is 9-16 volts.

• | The engine speed is more than 500 RPM for 5 seconds.

• | The vehicle is not in fuel shut off.

• | Drive the vehicle for a 2-3 shift cycle.

• | No open or short to ground exists for more than 4.3 seconds in each solenoid state.

4. Select Specific DTC.
5. Enter DTC P0758.

Has the test run and passed?

--

System OK

Go to Step 1