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 |
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. |
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.
-
This step tests circuit 1222 from the transmission 20-way connector to the VCM for an open.
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 data. Were DTCs P0753, P0758, and P1860 set? | -- | ||||||||
3 |
Refer to Electrical Diagnosis, Section 8.
Did you find and correct a problem? | -- | -- | |||||||
4 | 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 | |||||||
Is the test lamp on? | -- | |||||||||
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? | -- | -- | |||||||
Is the resistance greater than the specified value? | 5ohms | |||||||||
Measure the resistance between C2-6 and a known good ground. Is the resistance less than the specified value? | 1000ohms | |||||||||
9 |
Refer to Electrical Diagnosis, Section 8. Did you find a problem? | -- | ||||||||
10 |
Refer to Electrical Diagnosis, Section 8. Did you find a problem? | -- | ||||||||
11 | Replace the VCM. Refer to VCM Replacement/Programming , Section 6. Is the replacement complete? | -- | -- | |||||||
12 |
Automatic Transmission Connector End View Is the resistance within the specified values? | 20-40ohms at 20°C (68°F) | ||||||||
13 |
Is the resistance within the specified values? | 20-40ohms at 20°C (68°F) | ||||||||
14 | Measure the resistance between terminals A and E and ground. Use the J 39200 DVOM. Are both reading greater than the specified value? | 250kohms | Go to Diagnostic Aids | |||||||
15 |
Refer to Electrical Diagnosis, Section 8. Did you find and correct a problem? | -- | -- | |||||||
16 |
Are both readings greater than the specified value? | 250kohms | ||||||||
17 |
Refer to Electrical Diagnosis, Section 8. Did you find and correct a problem? | -- | -- | |||||||
18 | Replace the 1-2 SS Valve. Refer to 1-2 Shift Solenoid Valve Replacement, in On-Vehicle Service. Is the replacement complete? | -- | -- | |||||||
19 | In order to verify your repair, perform the following procedure:
Has the test run and passed? | -- | System OK |
DTC P0753 1-2 Shift Solenoid Circuit Electrical 6.5L Diesel
| Table 1: | Shift Solenoid State and Gear Ratio Table |
| Table 2: | DTC P0753 1-2 Shift Solenoid Circuit Electrical (6.5L Diesel) |
Circuit Description
The 1-2 SS 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 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 PCM controls the 1-2 SS valve by providing the ground path through circuit 1222.
When the PCM detects a continuous open or 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 engine runs for greater than 5 seconds. |
| • | Invalid output state. |
| • | A fault is detected for 4.3 out of 5 seconds. |
Action Taken When the DTC Sets
| • | The PCM commands maximum line pressure. |
| • | The PCM freezes shift adapts. |
| • | The PCM illuminates the Malfunction Indicator Lamp (MIL). |
Conditions for Clearing the DTC
| • | 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 poor electrical connections at the PCM. 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 APP Sensor codes that are present. Then inspect for any transmission DTCs that may have reset. |
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 for an open.
-
This step tests circuit 1222 for a short to ground.
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 data. Were DTCs P0753, P0758, and P1860 set? | -- | ||||||||
3 |
Refer to Electrical Diagnosis, Section 8.
Did you find and correct a condition? | -- | -- | |||||||
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 | ||||||||
Is the test lamp on? | -- | |||||||||
6 | Repair the open or short to ground in ignition feed circuit to the 1-2 SS Valve. Refer to Electrical Diagnosis, Section 8. Did you find and correct a condition? | -- | -- | |||||||
Is the resistance greater than the specified value? | 5 ohms | |||||||||
Measure the resistance between C3-C4 and a known good ground. Is the resistance less than the specified value? | 1000 ohms | |||||||||
9 |
Refer to Electrical Diagnosis, Section 8. Did you find a condition? | -- | ||||||||
10 |
Refer to Electrical Diagnosis, Section 8. Did you find a condition? | -- | ||||||||
11 | Replace the PCM. Refer to Powertrain Control Module Replacement/Programming , Section 6. Is the replacement complete? | -- | -- | |||||||
12 |
Automatic Transmission Connector End View Is the resistance within the specified values? | 20-40 ohms at 20°C (68°F) | ||||||||
13 |
Is the resistance within the specified values? | 20-40 ohms at 20°C (68°F) | ||||||||
14 | Measure the resistance between terminals A and E and ground. Use the J 39200 DVOM. Are both readings greater than the specified value? | 250 K ohms | Go to Diagnostic Aids | |||||||
15 |
Refer to Electrical Diagnosis, Section 8. Did you find and correct a condition? | -- | -- | |||||||
16 |
Are both readings greater than the specified value? | 250 K ohms | ||||||||
17 |
Refer to Electrical Diagnosis, Section 8. Did you find and correct a condition? | -- | -- | |||||||
18 | Replace the 1-2 SS Valve. Refer to 1-2 Shift Solenoid Valve Replacement, in On-Vehicle Service. Is the replacement complete? | -- | -- | |||||||
19 | In order to verify your repair, perform the following procedure:
Has the test run and passed? | -- | System OK |
