Circuit Description
The Powertrain Control Module (PCM) uses signals from the vehicle speed sensor to detect the actual gear position. The PCM then compares the actual gear with the shift schedule in the PCM memory to detect mechanical trouble of the shift solenoid #2.
Conditions for Setting the DTC
DTC P0755 will set when the following conditions are met:
| • | The gear required by the PCM does not match the actual gear. |
| • | Two driving cycle detection logic. |
Action Taken When the DTC Sets
A DTC P0755 is stored and the Malfunction Indicator Lamp (MIL) is turned ON.
Diagnostic Aids
Inspect for the following conditions:
| • | Shift select cable out of adjustment. |
| • | Clogged or leaky shift solenoid #2. |
| • | Transaxle mechanical malfunction. |
| • | Valve body fluid passage clogged. |
| • | A faulty PCM |
An intermittent may be caused by the following conditions:
| • | A poor connection |
| • | Rubbed through wire insulation |
| • | A broken wire inside the insulation |
Perform the following steps if DTC P0755 cannot be duplicated:
- Read the information in the freeze frame data.
- Use the data to determine the vehicle operating conditions when the DTC was set.
DTC Confirmation Procedure
- Turn the ignition switch to LOCK.
- Connect the Scan Tool to Data Link Connector (DLC).
- Turn the ignition switch to ON.
- Use a Scan Tool to clear the following items from the PCM memory:
- Start the engine and warm up to normal operating temperature.
- Accelerate the vehicle in Drive (D) range and test for upshifting from 1st, to 2nd, to 3rd, and 4th (overdrive) gears as vehicle speed increases.
- Stop the vehicle.
- Use the Scan Tool to inspect for DTC P0755.
| • | The DTC |
| • | The pending DTC |
| • | Freeze frame data |
Test Description
The number(s) below refer to the step number(s) on the diagnostic table.
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The Powertrain OBD System Check prompts the technician to complete some basic checks and store the freeze frame data on the scan tool if applicable. This creates an electronic copy of the data taken when the fault occurred. The information is then stored in the scan tool for later reference.
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This step checks for proper shift points.
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This step checks for a leaky shift solenoid #2.
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This step checks for a stuck closed shift solenoid #2.
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This step checks the condition of the valve body assembly.
-
This step checks for a faulty PCM.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
Was the On-Board Diagnostic (OBD) System Check performed? | -- | Go to Powertrain On Board Diagnostic (OBD) System Check in Engine Controls | ||
2 |
Does the scan tool display any other DTCs in addition to DTC P0755? | -- | Go to applicable DTC table | |
Perform Upshifts and Torque Converter Clutch Apply Procedure in Road Test in order to diagnose mechanical condition of transaxle. Is action complete? | -- | -- | ||
4 | Perform DTC Confirmation Procedure. Did this DTC reset? | -- | ||
Did the shift solenoid #2 outlet port open and did air escape? | -- | |||
Did the shift solenoid #2 outlet port open and did air escape? | -- | |||
7 | Refer to DTC P1780 Park/Neutral Position (PNP) Switch for diagnosis of the PNP switch. Is the action complete? | -- | -- | |
Remove the valve body and inspect the passages for any obstructions/restrictions. Refer to Valve Body and Accumulators Removal . Is the valve body in good condition? | -- | |||
Does this DTC reset? | -- | |||
10 | Repair or overhaul valve body assembly. Refer to Valve Body and Accumulators Removal . Is the action complete? | -- | ||
11 | A malfunction is not present at this time. Refer to Diagnostic Aids. Is the action complete? | -- | System OK | -- |
12 | Replace shift solenoid #2. refer to Shift Lock Control Solenoid Replacement . Is the action complete? | -- | -- | |
13 | Refer to Hydraulic/Mechanical Diagnosis for further diagnosis of the transaxle's performance. Repair as necessary. Is the action complete? | -- | -- | |
14 | Replace Powertrain Control Module (PCM). Refer to Powertrain Control Module Replacement in Engine Controls. Is the action complete? | -- | -- | |
15 | Perform the DTC Confirmation Procedure. Are any DTCs displayed on the Scan Tool? | -- | Go to applicable DTC table | System OK |
