Circuit Description
The 2-3 Shift Solenoid Valve (2-3 SS Valve) controls fluid acting on the 2-3 shift valve. The 2-3 SS Valve is a normally-open exhaust valve used with the 1-2 Shift Solenoid Valve (1-2 SS Valve) in order to allow four different shifting combinations. The 2-3 SS Valve attaches to the control valve body within the transmission. The ignition voltage goes directly to the 2-3 SS Valve. The Vehicle Control Module (VCM) controls the 2-3 SS Valve by providing the ground path through circuit 1223.
If the VCM detects a continuous open or short in the 2-3 SS Valve circuit or the 2-3 SS Valve, then DTC P0758 sets. DTC P0758 is a type D DTC. For California emissions vehicles, DTC P0758 is a type A DTC.
Conditions for Setting the DTC
| • | The system voltage is 10-16 volts. |
| • | The engine is running more than 475 RPM for more than 7 seconds. |
| • | The above conditions are met and either of the following conditions occur for 4.3 out of 5 seconds. |
| - | The VCM commands the 2-3 SS Valve On, and the voltage input remains high (B+). |
| - | The VCM commands the 2-3 SS Valve Off, and the voltage input remains low (0 volts). |
Action Taken When the DTC Sets
| • | The VCM illuminates the Malfunction Indicator Lamp (MIL) for California emission vehicles. |
| • | The VCM commands an immediate landing to second gear. |
| • | The VCM commands maximum line pressure. |
| • | The VCM freezes shift adapts form being updated. |
| • | DTC P0758 is stored in VCM history. |
Conditions for Clearing the DTC
| • | For California emissions vehicles, the VCM turns OFF the MIL after three consecutive trips 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 at the VCM, the transmission connector and all other circuit connecting points 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 |
| - | Moisture intrusion |
| - | Corrosion |
| • | When diagnosing for an intermittent short or open, massage the wiring harness while watching the test equipment for a change. |
| • | First diagnose and clear any engine DTCs or TP Sensor codes that are present. Then inspect for any transmission DTCs that may have reset. |
| • | Refer to Shift Solenoid Valve State and Gear Ratio table. |
Test Description
The numbers below refer to the step numbers on the diagnostic table.
-
This step tests the function of the 2-3 SS Valve and the internal wiring harness.
-
This step tests the power to the 2-3 SS Valve from the ignition through the fuse.
-
This step tests the ability of the VCM and the wiring to control the ground circuit.
-
This step measures the resistance of the Automatic Transmission Wiring Harness Assembly (A/T Wiring Harness Assy.) and the 2-3 SS valve.
Step | Action | Value(s) | Yes | No | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
1 | Was the Powertrain On-Board Diagnostic (OBD) System Check performed? | -- | ||||||||
2 |
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 stored Freeze Frame and Failure Records from the VCM. Were DTCs P0753, or P1860 also set? | -- | ||||||||
3 |
Refer to Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | ||||||||
Using the scan tool Output Control Function, command the 2-3 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 | ||||||||
Is the test lamp on? | -- | |||||||||
6 | Repair the open or high resistance in ignition feed circuit 1020 to the 2-3 SS Valve. Refer to Wiring Systems. Did you find and correct the condition? | -- | -- | |||||||
Does the test lamp illuminate when you command the shift solenoid ON and turn off when you command the shift solenoid OFF? | -- | |||||||||
8 | Inspect circuit 1223 for an open or short to ground. Refer to General Electrical Diagnosis in Wiring Systems. Did you find the condition? | -- | ||||||||
9 | Replace the VCM. Refer to VCM Replacement/Programming. Is the replacement complete? | -- | -- | |||||||
10 |
Is the resistance within the specified values? | 19-31Ω | ||||||||
11 |
Is the resistance within the specified values? | 19-31Ω | ||||||||
12 |
Are both readings greater than the specified value? | 250kΩ | Go to Diagnostic Aids | |||||||
13 |
Are both readings greater than the specified value? | 250kΩ | ||||||||
14 | Replace the Automatic Transmission Wiring Harness Assembly. Refer to Internal Wiring Harness Replacement, in On-Vehicle Service. Is the replacement complete? | -- | -- | |||||||
15 | Replace the 2-3 SS Valve. Refer to Control Valve Body Removal and Disassembly, in On-Vehicle Service. Is the replacement complete? | -- | -- | |||||||
16 | In order to verify your repair, perform the following procedure:
Has the test run and passed? | -- | System OK |
