DTC P0758 2-3 (B) Shift Solenoid Electrical. Chevrolet Brazil Blazer 1997

For 1990-2009 cars

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

Automatic Transmission Components 4.3L
Automatic Transmission Controls Schematics 4.3L
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 flow acting on the 2-3 shift valves. The solenoid is a normally-open exhaust valve. With the 1-2 Shift Solenoid Valve (1-2 SS Valve), the 2-3 SS Valve allows four different shifting combinations. The solenoid attaches to the control valve body within the transmission. The 2-3 SS Valve receives ignition voltage through circuit 1020. The VCM controls the solenoid by providing the ground path on circuit 1223.

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

### Conditions for Setting the DTC

• | The system voltage is 10-17 volts.

• | The engine is running.

• | All of the above conditions are met for 5 seconds and either of the following fail conditions occurs for 5 seconds:

- | The VCM commands the solenoid ON and the voltage input remains high (B+).

- | The VCM commands the solenoid OFF and the voltage input remains low (0 volts).

### Action Taken When the DTC Sets

• | The VCM commands third gear only.

• | The VCM commands maximum line pressure.

• | The VCM freezes shift adapts from being updated.

• | The VCM inhibits TCC engagement.

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

### Conditions for Clearing the MIL/DTC

• | The VCM turns OFF the MIL after three consecutive ignition cycles without a failure reported.

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

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

### Diagnostic Aids

• | Inspect the wiring for poor electrical connections at the VCM. Inspect the wiring for poor electrical connections at the transmission 20-way 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

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

#### 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 tests the function of the 2-3 SS Valve and the Automatic Transmission Wiring Harness Assembly.

2. This step tests for power to the 2-3 SS Valve from the ignition through the fuse.

3. This step tests circuit 1223 from the transmission 20-way connector to the VCM for an open.

4. This step tests circuit 1223 from the transmission 20-way connector to the VCM for a short to ground.

#### DTC P0758 2-3 Shift Solenoid Valve (2-3 SS 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 A Powertrain On Board Diagnostic (OBD) System Check

2

1. Install the scan tool (tech 1) ®.
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 DTCs P0753, P1860, P1864 and P1886 also set?

--

Go to Step 3

Go to Step 4

3

1. Inspect the TRANS fuse.
2. If the fuse is open, inspect circuit 1020, the solenoid and the Automatic Transmission Wiring Harness Assembly for a short to ground.
3. Repair the circuit, the solenoid, and the harness if necessary.

Refer to Electrical Diagnosis, Section 8A.

Did you find and correct a problem?

--

Go to Step 18

--

4 | Using the transmission output control function on the scan tool, command the 2-3 SS Valve 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 Diagnostic Aids | Go to Step 5

5

1. Turn the ignition OFF.
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 cavity E to ground.

Is the test lamp ON?

--

Go to Step 7

Go to Step 6

6 | Repair the open or short to ground in ignition feed circuit 1020 to the 2-3 SS Valve. Refer to Electrical Diagnosis, Section 8A. Did you find and correct a problem? | -- | Go to Step 18 | --

7

1. Turn the ignition switch OFF.
2. Disconnect the C2 (red) VCM connector.
3. Using the J 39200 Digital Multimeter and J 35616-A Connector Test Adapter Kit, measure the resistance between C2-4 and terminal B of the J 39775 Jumper harness.

Is the resistance measured greater than the specified value?

5 ohms

Go to Step 9

Go to Step 8

8 | Measure the resistance between C2-4 and a known good ground. Is the resistance measured less than the specified value? | 1000 ohms | Go to Step 10 | Go to Step 12
9 | Inspect circuit 1223 for an open. Repair the circuit if necessary. Did you find a problem? | -- | Go to Step 18 | Go to Step 11

10

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

Refer to Electrical Diagnosis, Section 8A.

Did you find a problem?

--

Go to Step 18

Go to Step 11

11 | Replace the VCM. Refer to VCM Replacement/Programming , Section 6. Is the replacement complete? | -- | Go to Step 18 | --

12

1. Install the J 39775 Jumper Harness on the Connector End View 20-way connector.
2. Measure the resistance between terminal B and terminal E.

Is the resistance within the specified range?

19-31 ohms

Go to Step 14

Go to Step 13

13

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

Is the resistance within the specified range?

19-31 ohms

Go to Step 16

Go to Step 17

14 | Measure the resistance between terminal B and terminal E and ground. Are both readings greater than the specified value? | 250 K ohms | Go to Diagnostic Aids | Go to Step 15

15

1. Disconnect the Automatic Transmission Wiring Harness Assembly from the 2-3 SS Valve.
2. Measure the resistance from the component's terminals to ground.

Are both readings greater than the specified value?

250 K ohms

Go to Step 16

Go to Step 17

16 | Replace the Automatic Transmission Wiring Harness Assembly. Refer to 4L60-E Automatic Transmission On-Vehicle Service. Is the replacement complete? | -- | Go to Step 18 | --
17 | Replace the 2-3 SS Valve. Refer to 2-3 Shift Solenoid Valve Replacement/4L60-E Automatic Transmission On-Vehicle Service. Is the replacement complete? | -- | Go to Step 18 | --

18

In order to verify your repair, perform the following procedure:

1. Select DTC.
2. Select Clear Info.
3. Operate the vehicle, and ensure that the following conditions are met:

• | The VCM commands the 2-3 SS Valve ON and the voltage input drops to zero.

• | The VCM commands the 2-3 SS Valve OFF and the voltage input 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