| Table 1: | Shift Solenoid Valve State and Gear Ratio 4L60-E |
| Table 2: | DTC P0758 2-3 Shift Solenoid Valve (2-3 SS Valve)-- Electrical |
Circuit Description
The 2-3 Shift Solenoid Valve (2-3 SS Valve) controls the fluid flow acting on the 2-3 shift valves. The solenoid is a normally-open exhaust valve. With the 1-2 Shift Solenoid Valve (1-2 SS Valve), the 2-3 SS Valve allows four different shifting combinations. The solenoid attaches to the control valve body within the transmission. The 2-3 SS Valve receives ignition voltage through circuit 1020. The VCM controls the solenoid by providing the ground path on circuit 1223.
When the VCM detects a continuous open or short to ground in the 2-3 SS Valve circuit or the 2-3 SS Valve, then DTC P0758 sets. DTC P0758 is a type A DTC.
Conditions for Setting the DTC
| • | The system voltage is 10-19 volts. |
| • | The engine speed is greater than 450 RPM for 8 seconds. |
| • | Not in fuel cutoff. |
| • | All of the above conditions are met for 5 seconds and either of the following fail conditions occurs for 5 seconds: |
| - | The VCM commands the solenoid ON and the voltage remains high (B+). |
| - | The VCM commands the solenoid OFF and the voltage remains low (0 volts). |
Action Taken When the DTC Sets
| • | The VCM commands third gear only. |
| • | The VCM commands maximum line pressure. |
| • | The VCM freezes shift adapts from being updated. |
| • | The VCM inhibits TCC engagement. |
| • | The VCM illuminates the Malfunction Indicator Lamp (MIL). |
Conditions for Clearing the MIL/DTC
| • | 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. |
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 tests the function of the 2-3 SS Valve and the Automatic Transmission Wiring Harness Assembly.
-
This step tests for 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 and the 2-3 SS Valve.
Step | Action | Value(s) | Yes | No | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
1 | Was the Powertrain On-Board Diagnostic (OBD) System Check performed? | -- | Go to OBD System Check | |||||||
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 data. Were DTCs P0740, P0753, P0785 and P1860 also set? | -- | ||||||||
3 |
Refer to Electrical Diagnosis, Section 8A. Did you find and correct a problem? | -- | -- | |||||||
Command the 2-3 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 Diagnostic Aids | ||||||||
Is the test lamp ON? | -- | |||||||||
6 | Repair the open or short to ground in ignition feed circuit 1020 to the 2-3 SS Valve. Refer to Electrical Diagnosis, Section 8A. Did you find and correct a problem? | -- | -- | |||||||
Does the test lamp illuminate when you command the shift solenoid ON and turn off when you command OFF? | -- | |||||||||
8 | Inspect circuit 1223 for an open or short to ground. Repair the circuit if necessary. Did you find a problem? | -- | ||||||||
9 | Replace the VCM. Refer to VCM Replacement, Section 6. Is the replacement complete? | -- | -- | |||||||
Is the resistance within the specified range? | 19-31 ohms | |||||||||
11 |
Is the resistance within the specified range? | 19-31 ohms | ||||||||
12 | Measure the resistance between terminal B and terminal E and ground. Are both readings greater than the specified value? | 250 K ohms | Go to Diagnostic Aids | |||||||
13 |
Are both readings greater than the specified value? | 250 K ohms | ||||||||
14 | Replace the Automatic Transmission Wiring Harness Assembly. Refer to 4L60-E Automatic Transmission On-Vehicle Service. Is the replacement complete? | -- | -- | |||||||
15 | Replace the 2-3 SS Valve. Refer to 2-3 Shift Solenoid Valve Replacement/4L60-E Automatic Transmission 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 |
