For 1990-2009 cars

Table 1: | Shift Solenoid Valve State and Gear Ratio 4L60-E
Table 2: | DTC P0758 2-3 Shift Solenoid Valve -- Electrical

### 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, the 2-3 SS Valve allows four different shifting combinations. The solenoid is attached to the control valve body within the transmission. Circuit 439 supplies ignition voltage directly to the 2-3 SS Valve. The PCM controls the solenoid by providing the ground path through circuit 1223.

When 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 10-17 volts.

• | 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).

• | All conditions are met for 5 seconds.

### Action Taken When the DTC Sets

• | The PCM commands third gear only.

• | The PCM commands maximum line pressure.

• | The PCM freezes shift adapts from being updated.

• | The PCM inhibits TCC engagement

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

### Conditions for Clearing the MIL/DTC

• | The PCM turns OFF the MIL after three consecutive ignition cycles 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 any poor electrical connections at the PCM. Inspect the wiring at the TCC brake switch. 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

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

#### Shift Solenoid Valve State and Gear Ratio 4L60-E

Gear | 1-2 Shift Solenoid | 2-3 Shift Solenoid | Gear Ratio
--- | --- | --- | ---
1 | ON | ON | 3.059:1
2 | OFF | ON | 1.625:1
3 | OFF | OFF | 1.000:1
4 | ON | OFF | 0.696:1

### Test Description

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

1. This step verifies that the 2-3 SS Valve and the Automatic Transmission wiring harness are functioning normally.

2. This step verifies that the ignition supplies power to the 2-3 SS Valve through the PCM IGN fuse.

3. This step verifies that the valve's resistance is within specifications.

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

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
1 | Was the Powertrain On-Board Diagnostic (OBD) System Check performed? | -- | Go to Step 2 | Go to Powertrain On Board Diagnostic (OBD) System Check , Section 6
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.

Were the DTCs P0753, P0758, P1860, P1864, and P1886 set?

--

Go to Step 3

Go to Step 4

3 |

1. Inspect circuit 439, the solenoid, the PCM IGN fuse, and the Automatic Transmission Wiring Harness for an open or short to ground.
2. Repair the circuit, the solenoid, and the harness if necessary.

Refer to Electrical Diagnosis, Section 8.

Did you find and correct a problem?

--

Go to Step 22

--

4 | Using the scan tool, command the 2-3 SS Valve Assy. ON and OFF three times while listening to the bottom of the transmission pan (a stethoscope may be necessary). Does the solenoid click when commanded? | -- | Go to Step 5 | Go to Step 6
5 |

1. Examine every connection at the PCM and at the transmission 20-way connector for the following conditions:

• | Poor connections

• | Bent connector pins

• | Backed out connector pins

2. Repair the connectors if necessary.

Did you find and correct a problem?

--

Go to Step 22

Go to Diagnostic Aids

6 |

1. Turn the ignition switch to the OFF position.
2. Disconnect the transmission 20-way connector (additional DTCs will set).
3. Install the J 39775 Jumper Harness on the engine harness connector .
4. With the engine OFF, turn the ignition switch to the RUN position.
5. Connect a test lamp from J 39775 Jumper Harness connector cavity E to ground.

Does the test lamp illuminate?

--

Go to Step 7

Go to Step 8

7 |

1. Install a test lamp from the cavity E to the cavity B of the J 39775 Jumper Harness connector .

Important: Ground Pin R of the Jumper Harness.

2. Using the scan tool, command the 2-3 shift solenoid valve assembly ON and OFF three times.

Does the test lamp illuminate when you command the 2-3 shift solenoid valve assembly ON, and turn OFF when you command the solenoid OFF?

--

Go to Step 14

Go to Step 9

8 | Repair the open in ignition feed circuit 439 to the 2-3 SS Valve Assy. Refer to Electrical Diagnosis, Section 8. Did you find and correct a problem? | -- | Go to Step 22 | --
9 | Was the test lamp OFF continuously? | -- | Go to Step 10 | Go to Step 11
10 |

1. Inspect circuit 1223 for an open connection, a poor PCM connection, or a poor shift solenoid connection.
2. Repair the circuit if necessary.

Refer to Electrical Diagnosis, Section 8.

Did you find and repair a problem?

--

Go to Step 22

Go to Step 13

11 | Was the test lamp illuminated continuously? | -- | Go to Step 12 | --
12 |

1. Inspect circuit 1223 for a short to ground.
2. Repair circuit 1223 if necessary.

Refer to Electrical Diagnosis, Section 8.

Did you find and correct a problem?

--

Go to Step 22

Go to Step 13

13 | Inspect the PCM connector terminals for the following conditions:

1. Damaged connector pins
2. Backed out connector pins
3. Weak terminal tension
4. Repair the connectors if necessary.

Did you find and correct a problem.

--

Go to Step 22

Go to Step 22

14 |

1. Turn the ignition switch to the OFF position.
2. Install the J 39775 Jumper Harness on the Connector End View 20-way connector.
3. Using J 39200 DVOM, measure the resistance between the terminal B and the transmission case (ground).
4. Measure the resistance between terminal E of the transmission harness 20-way connector and the transmission case (ground).

Are both readings greater than the specified value?

250kohms

Go to Step 15

Go to Step 18

15 |

1. Turn the ignition switch to the OFF position.
2. Install the J 39775 Jumper Harness on the Connector End View 20-way connector.
3. Measure the resistance between the terminals B and E.

Is the resistance within the specified range?

19-31ohms

Go to Diagnostic Aids

Go to Step 16

16 |

1. Disconnect the Automatic Transmission Wiring Harness from the 2-3 SS Valve Assy.
2. Measure the resistance of the 2-3 SS Valve Assy.

Is the resistance within the specified range?

19-31ohms

Go to Step 17

Go to Step 20

17 |

1. Inspect the Automatic Transmission Wiring Harness for an open circuit.
2. Repair the harness if necessary.

Refer to Electrical Diagnosis, Section 8.

Did you find and correct a problem?

--

Go to Step 22

--

18 |

1. Disconnect the Automatic Transmission Wiring Harness from the 2-3 SS Valve Assy.
2. Using J 39200 DVOM, measure the resistance from the component's terminals to ground.

Are both readings greater than the specified value?

250kohms

Go to Step 19

Go to Step 20

19 |

1. Inspect the Automatic Transmission Wiring Harness for a short to ground.
2. Repair the harness if necessary.

Refer to Electrical Diagnosis, Section 8.

Did you find and correct a problem?

--

Go to Step 22

--

20 | Replace the 2-3 SS Valve Assy. Refer to 2-3 Shift Solenoid Valve Replacement, in On-Vehicle Service. Is the replacement complete? | -- | Go to Step 22 | --
21 | Replace the PCM. Refer to Powertrain Control Module Replacement/Programming , Section 6. Is the replacement complete? | -- | Go to Step 22 | --
22 |

1. After the repair is complete, select DTC.
2. Select Clear Info.
3. Operate the vehicle under the following conditions:

• | The 2-3 SS Valve is commanded ON and the voltage decreases to zero.

• | The 2-3 SS Valve is commanded OFF and the voltage increases to B+.

• | All conditions are met for 5 seconds.

4. Select Specific DTC. Enter DTC P0758.

Has the test run and passed?

--

System OK

Begin the diagnosis again. Go to Step 1