DTC P0753. Chevrolet Corvette 2002

For 1990-2009 cars only

Makes 🢒 Chevrolet 🢒 2002 🢒 Corvette 🢒 Transmission/Transaxle 🢒 Automatic Transmission - 4L60-E 🢒 DTC P0753

Circuit Description

The 1-2 shift solenoid (SS) valve controls the fluid flow acting on the 1-2 and 3-4 shift valves. The 1-2 SS valve is a normally-open exhaust valve that is used with the 2-3 SS valve in order to allow four different shifting combinations. The solenoid attaches to the control valve body within the transmission. The 1-2 SS valve receives ignition voltage through ignition 1 circuit. The powertrain control module (PCM) controls the solenoid by providing the ground path on the 1-2 shift solenoid valve control circuit.

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

Conditions for Running the DTC

•	The system voltage is 10-18 volts.

•	The engine speed is greater than 450 RPM for 5 seconds.

•	The engine is not in fuel cutoff.

Conditions for Setting the DTC

DTC P0753 sets if one of the following conditions occurs for 5 seconds:

Condition 1

The PCM commands the solenoid ON and the voltage feedback remains high, B+.

Condition 2

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 inhibits TCC engagement.

•	The PCM commands D2 line pressure.

•	The PCM inhibits 3-2 downshifts if the vehicle speed is greater than 48 km/h (30 mph).

•	The PCM inhibits 4th gear if in hot mode.

•	The PCM freezes transmission adapt functions.

•	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 the 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 ignition switch is OFF long enough in order to power down the PCM.

Test Description

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

This step tests the function of the 1-2 SS valve and the automatic transmission (AT) wiring harness assembly.

This step tests for power to the 1-2 SS valve from the ignition through the fuse.

This step tests the ability of the PCM and the wiring to control the ground circuit.

This step measures the resistance of the AT wiring harness assembly and the 1-2 SS valve.

DTC P0753

Step

Action

Value(s)

Yes

Did you perform the Powertrain Diagnostic System Check?

Go to Step 2

Go to Diagnostic System Check - Engine Controls in Engine Controls

Install a scan tool.
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.

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

Are any of the following DTCs also set?

•

P0740

•

P0758

•

P0785

•

P1860

Go to Step 3

Go to Step 4

Inspect the ENG IGN 1 fuse for an open.

Refer to General Electrical Diagnosis in Wiring Systems.

Is the fuse open?

Go to Step 12

Go to Step 5

Use the scan tool in order to command the 1-2 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 Intermittent Conditions in Engine Controls

Go to Step 5

Turn OFF the ignition.
Disconnect the AT inline 20-way connector, additional DTCs may set.
Install the J 44152 Jumper Harness (20 pins) on the engine side of the AT inline 20-way connector.
Turn ON the ignition, with the engine OFF.
Using the J 35616 GM Terminal Test Kit, connect a test lamp from terminal E of the J 44152 to ground.

Refer to Automatic Transmission Inline Harness Connector End View .

Does the test lamp illuminate?

Go to Step 6

Go to Step 15

Connect a test lamp between terminal E and terminal A of the J 44152 .

Refer to Automatic Transmission Inline Harness Connector End View .

Use the scan tool in order to command the 1-2 SS valve ON and OFF three times.

Does the test lamp turn ON and OFF with each command?

Go to Step 8

Go to Step 7

Is the test lamp always ON?

Go to Step 16

Go to Step 17

Install the J 44152 on the transmission side of the AT inline 20-way connector.
Using the DMM and the J 35616 , measure the resistance between terminal A and terminal E of the J 44152 .

Refer to Automatic Transmission Inline Harness Connector End View .

Does the resistance measure within the specified range?

19-31 ohms

Go to Step 9

Go to Step 10

Measure the resistance from terminal A to ground, and from terminal E to ground.

Do both readings measure greater than the specified value?

250 K ohms

Go to Intermittent Conditions in Engine Controls

Go to Step 11

Disconnect the AT wiring harness assembly from the 1-2 SS valve.
Measure the resistance of the 1-2 SS valve.

Does the resistance measure within the specified range?

19-31 ohms

Go to Step 18

Go to Step 19

Disconnect the AT wiring harness assembly from the 1-2 SS valve.
Measure the resistance from the component's terminals to ground.

Do both readings measure greater than the specified value?

250 K ohms

Go to Step 18

Go to Step 19

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 ignition circuit (CKT 339) of the 1-2 SS valve for a short to ground between the underhood electrical center 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 21

Go to Step 13

Test the ignition 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 a short to ground condition?

Go to Step 18

Go to Step 14

Test each solenoid for a short to ground.
Replace the faulty solenoid as necessary.

Did you complete the replacement?

Go to Step 21

Test the ignition circuit (CKT 339) of the 1-2 SS valve for an open.

Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 21

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 21

Go to Step 20

Test the control circuit (CKT 1222) of the 1-2 SS valve for an open or short to power 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 21

Go to Step 20

Replace the AT wiring harness assembly.

Refer to Torque Converter Clutch Pulse Width Modulation Solenoid, Torque Converter Clutch Solenoid, and Wiring Harness .

Did you complete the replacement?

Go to Step 21

Replace the 1-2 SS valve.

Refer to Control and Shift Solenoids Replacement .

Did you complete the replacement?

Go to Step 21