DTC P0753 1-2 Shift Solenoid Circuit Electrical. Chevrolet PJJ 2000

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

### Circuit Description

The 1-2 shift solenoid (1-2 SS) valve controls fluid flow acting on the 1-2 shift valve. The solenoid is a normally-open valve that, in conjunction with the 2-3 shift solenoid (2-3 SS) valve, allows four different shifting combinations (Refer to the Shift Solenoid Valve State and Gear Ratio table). The 1-2 SS valve is attached to the valve body, within the transmission.

The solenoid receives ignition voltage through the fused power feed circuit. The PCM commands the solenoid ON or OFF by providing a ground path.

When the PCM detects a continuous open, short to ground, or short to voltage in the 1-2 SS valve circuit, then DTC P0753 sets. DTC P0753 is a type B DTC.

### Conditions for Running the DTC

• | The ignition switch is in the ON position.

• | The system voltage is 8-18 volts.

### Conditions for Setting the DTC

One of the following conditions occurs for 4.3 seconds:

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

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

### Action Taken When the DTC Sets

• | The PCM illuminates the malfunction indicator lamp (MIL) during the second consecutive trip in which the Conditions for Setting the DTC are met.

• | The PCM commands maximum line pressure.

• | The PCM inhibits TCC engagement.

• | The PCM inhibits 3-2 downshifts above 51 km/h (32 mph).

• | The PCM freezes shift adapts from being updated.

• | The PCM records the operating conditions when the Conditions for Setting the DTC are met. The PCM stores this information as Freeze Frame and Failure Records.

• | The PCM stores DTC P0753 in PCM history during the second consecutive trip in which the Conditions for Setting the DTC are met.

### Conditions for Clearing the MIL/DTC

• | The PCM turns OFF the MIL during the third consecutive trip in which the diagnostic test runs and passes.

• | A scan tool can clear the MIL/DTC.

• | The PCM clears the DTC from PCM history if the vehicle completes 40 warm-up cycles without an emission-related diagnostic fault occurring.

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

### Diagnostic Aids

• | An open in the power feed circuit may cause multiple DTCs to set.

• | Inspect the connectors at the PCM, the 1-2 SS valve and all other circuit connecting points for an intermittent condition. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.

• | Inspect the circuit wiring for an intermittent condition. Refer to Testing for Electrical Intermittents in Wiring Systems.

### Test Description

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

1. This step tests the electrical operation of the solenoid.

2. This step tests the PCM and the wiring to the transmission.

3. This step verifies that the circuit has the correct resistance.

#### P0753 1-2 Shift Solenoid Circuit -- Electrical

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
1 | Did you perform the Powertrain Diagnostic System Check ? | -- | Go to Step 2 | Go to Powertrain On Board Diagnostic (OBD) System Check

2

1. Install a Scan Tool .
2. Turn ON the ignition, with the engine OFF.

Important: Before clearing the DTC, use the Scan Tool in order to record the Freeze Frame and Failure Records. Using the Clear Info function erases the Freeze Frame and Failure Records from the PCM.

3. Record the DTC Freeze Frame and Failure Records.
4. Clear the DTC.

Is DTC P0758 or P1860 also set?

--

Go to Step 3

Go to Step 8

3

1. Remove the ERLS fuse.
2. Inspect the fuse for an open.

Refer to Wiring Repairs in Wiring Systems.

Did you find the condition?

--

Go to Step 4

Go to Step 6

4

Important: The condition that affects this circuit may exist in other connecting branches of the circuit. Refer to Power Distribution Schematics in Wiring Systems, for complete circuit distribution.

Test the power feed circuit (CKT 439) of the 1-2 SS valve for a short to ground between the fuse block and the AT inline 20-way connector.

Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 25

Go to Step 5

5

Important: The condition that affects this circuit may exist in other connecting branches of the circuit. Refer to Power Distribution Schematics in Wiring Systems, for complete circuit distribution.

Test the power feed circuit (CKT 839) of the 1-2 SS valve for a short to ground between the AT inline 20-way connector and the 1-2 SS valve.

Refer to Circuit Testing in Wiring Systems.

Did you find the condition?

--

Go to Step 22

--

6 | Test the power feed circuit (CKT 439) of the 1-2 SS valve for an open between the fuse block and the AT inline 20-way connector. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 25 | Go to Step 7
7 | Test the power feed circuit (CKT 839) of the 1-2 SS valve for an open between the AT inline 20-way connector and the 1-2 SS valve. Refer to Circuit Testing in Wiring Systems. Did you find the condition? | -- | Go to Step 22 | --

8

1. Use the Scan Tool in order to command the 1-2 SS valve ON and OFF 3 times.
2. Listen at the transmission side cover.

Does the solenoid click when commanded ON and OFF?

--

Go to Diagnostic Aids

Go to Step 9

9

1. Turn OFF the ignition.
2. Disconnect the AT inline 20-way connector (additional DTCs may set).
3. Install the J 44152 jumper harness (20 pins) on the engine side of the AT inline 20-way connector.
4. Using the J 35616 connector test adapter kit, connect a test lamp between terminals E and A of the J 44152 .

Refer to Automatic Transmission Inline Harness Connector End View .

5. Turn ON the ignition, with the engine OFF.
6. Command the 1-2 SS valve ON and OFF three times.

Is the test lamp ON when you command the solenoid ON, and OFF when you command the solenoid OFF?

--

Go to Step 17

Go to Step 10

10 | Is the test lamp always ON? | -- | Go to Step 11 | Go to Step 13

11

1. Turn OFF the ignition.
2. Disconnect the PCM connector C2 (additional DTCs may set).
3. Turn ON the ignition, with the engine OFF.

Is the test lamp ON?

--

Go to Step 12

Go to Step 24

12 | Test the control circuit (CKT 1222) of the 1-2 SS valve for a short to ground between the PCM connector C2 and the AT inline 20-way connector. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 25 | --
13 | Is the test lamp always OFF? | -- | Go to Step 14 | --
14 | Test the control circuit (CKT 1222) of the 1-2 SS valve for an open between the PCM connector C2 and the AT inline 20-way connector. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 25 | Go to Step 15
15 | Connect a test lamp from terminal A of the J 44152 to a good ground. Refer to Automatic Transmission Inline Harness Connector End View . Is the test lamp ON? | -- | Go to Step 16 | Go to Step 24
16 | Test the control circuit (CKT 1222) of the 1-2 SS valve for a short to voltage between the PCM connector C2 and the AT inline 20-way connector. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 25 | --

17

1. Turn OFF the ignition.
2. Disconnect the J 44152 from the engine side of the AT inline 20-way connector.
3. Install the J 44152 on the transmission side of the AT inline 20-way connector.
4. Using the J 39200 digital multimeter (DMM) and the J 35616 , measure the resistance between terminals E and A of the J 44152 .

Refer to Automatic Transmission Inline Harness Connector End View .

Is the resistance within the specified range?

19-31 ohms

Go to Step 20

Go to Step 18

18 | Is the resistance greater than the specified value? | 250 ohms | Go to Step 19 | Go to Step 20

19

1. Test the control circuit (CKT 1222) of the 1-2 SS valve for an open between the AT inline 20-way connector and the 1-2 SS valve.
2. Test the power feed circuit (CKT 839) of the 1-2 SS valve for an open between the AT inline 20-way connector and the 1-2 SS valve.

Refer to Circuit Testing in Wiring Systems.

Did you find a condition?

--

Go to Step 22

Go to Step 23

20 | Measure the resistance from terminal A of the J 44152 to a good ground. Refer to Automatic Transmission Inline Harness Connector End View . Is the resistance less than the specified value? | 1000 ohms | Go to Step 21 | Go to Step 23
21 | Test the control circuit (CKT 1222) of the 1-2 SS valve for a short to ground between the AT inline 20-way connector and the 1-2 SS valve. Refer to Circuit Testing in Wiring Systems. Did you find the condition? | -- | Go to Step 22 | --
22 | Replace the automatic transmission wiring harness. Refer to Transmission Overhaul in the 4T40-E/4T45-E Section of the Transmission Unit Repair Manual. Did you complete the replacement? | -- | Go to Step 25 | --
23 | Replace the 1-2 SS valve. Refer to Control and Shift Solenoids Replacement. Did you complete the replacement? | -- | Go to Step 25 | --
24 | Replace the PCM. Refer to Powertrain Control Module Replacement/Programming in Engine Controls. Did you complete the replacement? | -- | Go to Step 25 | --

25

Perform the following procedure in order to verify the repair:

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

• | Drive the vehicle in D4.

• | Allow the transmission to shift through all the gears.

4. Select Specific DTC. Enter DTC P0753.

Has the test run and passed?

--

System OK

Go to Step 1