| Table 1: | Shift Solenoid Valve State and Gear Ratio 4L60-E |
| Table 2: | DTC P0758 2-3 Shift Solenoid Valve -- Electrical |
Circuit Description
The 2-3 Shift Solenoid Valve (2-3 SS Valve) controls the fluid acting on the 2-3 shift valves. The solenoid is a normally-open exhaust valve . In combination with the 1-2 Shift Solenoid Valve, the 2-3 SS Valve allows four different shifting combinations. The solenoid is attached to the control valve body within the transmission. Circuit 439 supplies ignition voltage directly to the 2-3 SS Valve. The PCM controls the solenoid by providing the ground path through circuit 1223.
When the PCM detects a continuous open or short to ground in the 2-3 SS Valve circuit or in the 2-3 SS Valve, then DTC P0758 sets. DTC P0758 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 are met for 5 seconds. |
Action Taken When the DTC Sets
| • | The PCM commands third gear only. |
| • | The PCM commands maximum line pressure. |
| • | The PCM freezes shift adapts from being updated. |
| • | The PCM inhibits TCC engagement |
| • | 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. |
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 2-3 SS Valve and the Automatic Transmission wiring harness are functioning normally.
-
This step verifies that the ignition supplies power to the 2-3 SS Valve through the PCM IGN fuse.
-
This step verifies that the valve's resistance is within specifications.
Step | Action | Value(s) | Yes | No | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
1 | Was the Powertrain On-Board Diagnostic (OBD) System Check performed? | -- | Go to Powertrain On Board Diagnostic (OBD) System Check , Section 6 | |||||||
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 the DTCs P0753, P0758, P1860, P1864, and P1886 set? | -- | ||||||||
3 |
Refer to Electrical Diagnosis, Section 8. Did you find and correct a problem? | -- | -- | |||||||
Using the scan tool, command the 2-3 SS Valve Assy. 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? | -- | |||||||||
5 |
Did you find and correct a problem? | -- | Go to Diagnostic Aids | |||||||
Does the test lamp illuminate? | -- | |||||||||
7 |
Important: Ground Pin R of the Jumper Harness. Does the test lamp illuminate when you command the 2-3 shift solenoid valve assembly ON, and turn OFF when you command the solenoid OFF? | -- | ||||||||
8 | Repair the open in ignition feed circuit 439 to the 2-3 SS Valve Assy. Refer to Electrical Diagnosis, Section 8. Did you find and correct a problem? | -- | -- | |||||||
9 | Was the test lamp OFF continuously? | -- | ||||||||
10 |
Refer to Electrical Diagnosis, Section 8. Did you find and repair a problem? | -- | ||||||||
11 | Was the test lamp illuminated continuously? | -- | -- | |||||||
12 |
Refer to Electrical Diagnosis, Section 8. Did you find and correct a problem? | -- | ||||||||
13 | Inspect the PCM connector terminals for the following conditions:
Did you find and correct a problem. | -- | ||||||||
14 |
Are both readings greater than the specified value? | 250kohms | ||||||||
15 |
Is the resistance within the specified range? | 19-31ohms | Go to Diagnostic Aids | |||||||
Is the resistance within the specified range? | 19-31ohms | |||||||||
17 |
Refer to Electrical Diagnosis, Section 8. Did you find and correct a problem? | -- | -- | |||||||
18 |
Are both readings greater than the specified value? | 250kohms | ||||||||
19 |
Refer to Electrical Diagnosis, Section 8. Did you find and correct a problem? | -- | -- | |||||||
20 | Replace the 2-3 SS Valve Assy. Refer to 2-3 Shift Solenoid Valve Replacement, in On-Vehicle Service. Is the replacement complete? | -- | -- | |||||||
21 | Replace the PCM. Refer to Powertrain Control Module Replacement/Programming , Section 6. Is the replacement complete? | -- | -- | |||||||
22 |
Has the test run and passed? | -- | System OK |
