DTC P0753 1-2 Shift Solenoid Circuit Electrical. Chevrolet Caprice 1996

For 1990-2009 cars only

Makes 🢒 Chevrolet 🢒 1996 🢒 Caprice 🢒 DTC 🢒 DTC P0753 1-2 Shift Solenoid Circuit Electrical

Table 1:	Shift Solenoid Valve State and Gear Ratio 4L60-E
Table 2:	DTC P0753 1-2 Shift Solenoid Valve - Electrical

Automatic Transmission Components
Automatic Transmission Controls Schematics
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 acting on the 1-2 and 3-4 shift valve. The solenoid is a normally-open exhaust valve. The combination of the 2-3 Shift Solenoid Valve and the 1-2 SS Valve allows four different shifting combinations. The solenoid attaches to the control valve body within the transmission. Circuit 439 supplies ignition voltage directly to the 1-2 SS Valve. The PCM controls the solenoid by providing a ground path through circuit 1222.

When the PCM detects a continuous open or a short to ground in the 1-2 SS Valve circuit or the 1-2 SS Valve, then DTC P0753 sets. DTC P0753 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 met for 5 seconds

Action Taken When the DTC Sets

•	Maximum line pressure

•	The PCM freezes shift adapts from being updated.

•	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.

•	An open feed circuit can set multiple DTCs.

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.

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

This step verifies that the ignition supplies power to the 1-2 SS Valve through the EMI fuse.

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

DTC P0753 1-2 Shift Solenoid Valve - Electrical

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 , Section 6

Install the scan tool.
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.
Have DTCs P0753, P0758, P1860, P1864, and P1886 set?

Go to Step 3

Go to Step 4

Inspect circuit 1339, the solenoid, the EMI fuse, and the Automatic Transmission wiring harness for short to ground.
Repair the harness, the solenoid, and the circuit if necessary. Refer to Electrical Diagnosis, Section 8.

Did you find and correct a problem?

Go to Step 22

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).

Did the solenoid click when commanded?

Go to Step 5

Go to Step 6

Inspect every connection at the PCM.
Inspect the transmission 20-way harness for the following conditions:

•	Poor connections

•	Bent connector pins

•	Backed out connector pins

Did you find and correct a problem?

Go to Step 22

Go to Diagnostic Aids

Turn the ignition switch to the OFF position.
Disconnect the connector 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 J 39775 Jumper Harness cavity E to ground.

Did the test lamp Illuminate?

Go to Step 7

Go to Step 8

Install a test lamp between the cavity E and the cavity A of the J 39775 Jumper Harness.
Using the scan tool, command the 1-2 Shift Solenoid Valve ON and OFF three times.

Does the test lamp illuminate when you command the solenoid valve ON, and turn OFF when you command the solenoid valve OFF?

Go to Step 14

Go to Step 9

Repair the open or short to ground in the ignition feed circuit 439 to the 1-2 SS Valve. Refer to Electrical Diagnosis, Section 8.

Did you find and correct a problem?

Go to Step 22

Monitor the test lamp.

Was the test lamp OFF continuously?

Go to Step 10

Go to Step 11