DTC P0753 1-2 Shift Solenoid Circuit Electrical. Chevrolet Chevy MD Steel Tilt (W Model) 1996

For 1990-2009 cars only

Makes 🢒 Chevrolet 🢒 1996 🢒 Chevy MD Steel Tilt (W Model) 🢒 DTC 🢒 DTC P0753 1-2 Shift Solenoid Circuit Electrical

DTC P0753 1-2 Shift Solenoid Circuit Electrical 5.7L and 7.4L Gas

Table 1:	Shift Solenoid State and Gear Ratio Table
Table 2:	P0753

Automatic Transmission Components 5.7L and 7.4L Gas
Automatic Transmission Controls Schematics 5.7L and 7.4L
OBD II Symbol Description Notice
Handling ESD Sensitive Parts Notice

Circuit Description

The 1-2 Shift Solenoid Valve (1-2 SS Valve) controls the fluid flow action on the 1-2 and the 3-4 shift valves. The 1-2 SS Valve is a normally-open exhaust valve that is used with the 2-3 shift solenoid Valve (2-3 SS Valve) to allow for four different shifting combinations. The 1-2 SS Valve attaches to the control valve body within the transmission. The ignition voltage goes directly to the 1-2 SS Valve. The VCM controls the 1-2 SS valve by providing the ground path through circuit 1222.

When the VCM detects a continuous open or short in the 1-2 SS Valve circuit or the 1-2 SS Valve, then DTC P0753 sets. DTC P0753 is a type D DTC. For California emission vehicles, DTC P0753 is a type A DTC.

Conditions for Setting the DTC

•	No system voltage DTC P0560.

•	The ignition is ON.

•	The engine runs for greater than 5 seconds and not in fuel cutoff

•	Fails for 4.3 out of 5 seconds.

•	The VCM commands the solenoid on, and the voltage remains high (B+), or the VCM commands the solenoid off and the voltage remains low.

Action Taken When the DTC Sets

•	The VCM commands maximum line pressure.

•	The VCM freezes shift adapts.

•	The VCM illuminates the Malfunction Indicator Lamp (MIL) for California Emissions vehicles.

Conditions for Clearing the DTC

•	For California emissions, 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.

•	An open ignition feed circuit can cause multiple DTCs to set.

•	First diagnose and clear any engine DTCs or TP Sensor codes that are present. Then inspect for any transmission DTCs that may have reset.

Shift Solenoid State and Gear Ratio Table

Gear	1-2 SS Valve	2-3 SS Valve	Gear Ratio
1	ON	OFF	2.48:1
2	OFF	OFF	1.48:1
3	OFF	ON	1.00:1
4	ON	ON	0.75:1

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 internal wiring harness.

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

This step tests circuit 1222 from the transmission 20-way connector to the VCM for an open.

P0753

Step

Action

Value(s)

Yes

Was the Powertrain On-Board Diagnostic (OBD) System Check performed?

Go to Step 2

Go to Powertrain On Board Diagnostic (OBD) System Check

Install the scan tool (tech 1) ®.
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.

Record the DTC Freeze Frame and Failure Records.

Were DTCs P0753, P0758, and P1860 set?

Go to Step 3

Go to Step 4

Inspect the trans. fuse.
If you find an open fuse, inspect the following components for a short to ground.

Refer to Electrical Diagnosis, Section 8.

•	Circuit 1020

•	The solenoid

•	The internal wiring harness

Repair the circuit, the solenoid, and the internal wiring harness if necessary.

Did you find and correct a problem?

Go to Step 19

Command the 1-2 SS Valve ON and OFF three times while listening to the bottom of the transmission pan (use a stethoscope if needed).

Does the solenoid click when commanded?

Go to Diagnostic Aids

Go to Step 5

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

Is the test lamp on?

Go to Step 7

Go to Step 6

Repair the open or short to ground in ignition feed circuit 1020 to the 1-2 SS Valve.

Refer to Electrical Diagnosis, Section 8.

Did you find and correct a problem?

Go to Step 19

Turn the ignition switch OFF.
Disconnect the C2 (red) VCM connector.
Measure the resistance between C2-6 and terminal A of the J 39775 Jumper Harness. Use the J 39200 DVOM and the J 35616-A Connector Test Adapter Kit.

Is the resistance greater than the specified value?

5ohms

Go to Step 9

Go to Step 8

Measure the resistance between C2-6 and a known good ground.

Is the resistance less than the specified value?

1000ohms

Go to Step 10

Go to Step 12