DESCRIPTION & OPERATION
The first step in diagnosing any driveability problem is verifying the customer's complaint with a test drive under the conditions the problem reportedly occurred. Before entering self-diagnostics, perform a careful and complete visual inspection. Most transmission control problems result from mechanical breakdowns or poor electrical connections.
Input signals from sensors are sent to the Powertrain Control Module (PCM). The PCM controls shifts and converter clutch application. The PCM can also determine line pressure needed to optimize shift feel.
Five electronic solenoids accomplish the following functions
- 2 On/Off solenoids for shifting.
- One Pulse-Width Modulator (PWM) solenoid for Torque Converter Clutch (TCC) control.
- One Variable Force Style (VFS) Electronic Pressure Control (EPC) solenoid for line pressure control.
- One Variable Force Style (VFS) 3-2 timing/coast clutch solenoid to control release of coast clutch, coordinated release of the direct clutch, and apply of the low and intermediate band.
PCM has built-in self-diagnosis, fail-safe code and warning code display for the main input sensors and solenoid valves.
Description
Following procedures are functional tests of EEC-V system. These basic test steps must be followed in sequence to avoid misdiagnosis
- VISUAL CHECK
- EQUIPMENT HOOKUP
- KOEO (KEY ON ENGINE OFF) SELF-TEST
- KOER (KEY ON ENGINE RUNNING) SELF-TEST
After each service or repair procedure has been completed, repeat QUICK TEST to ensure all EEC-V systems work properly and DTC's are no longer present.
DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION
Note. Only transaxle related trouble codes are listed. For engine related DTC definitions, see TROUBLE CODE DEFINITIONS article in APPLICATIONS & IDENTIFICATION. For engine related DTC diagnosis, see appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. These DTCs pertain to engine performance and must be repaired first, as engine performance and related component signals will affect transaxle operation and diagnosis.
| DTC (1) | System Test | Code Definition |
|---|---|---|
| P0707 | D | TR Sensor Circuit Shorted |
| P0708 | D | TR Sensor Circuit Open |
| P0712 | B | TFT Sensor Circuit Shorted |
| P0713 | B | TFT Sensor Circuit Open |
| P0715 | F | Insufficient Input From TSS Sensor |
| P0720 | F | Noisy OSS Sensor Signal |
| P0721 | F | Weak OSS Sensor Signal |
| P0731 | A | No 1st Gear |
| P0732 | A | No 2nd Gear |
| P0733 | A | No 3rd Gear |
| P0734 | A | No 4th Gear |
| P0741 | C | TCC Engagement Error |
| P0743 | C | TCC Circuit Error |
| P0750 | A | SS1 Solenoid Circuit Failure |
| P0751 | A | SS1 Functional Failure |
| P0755 | A | SS2 Solenoid Circuit Failure |
| P0756 | A | SS2 Functional Failure |
| P1705 | D | TR Switch Not In Park |
| P1711 | B | TFT Sensor Out Of Range |
| P1741 | C | TCC Engagement Error |
| P1742 | C | TCC Solenoid Failed On |
| P1743 | C | TCC Solenoid Failed Off |
| P1744 | C | TCC/Excessive Slip Detected |
| P1746 | E | Open PCM Output Driver |
| P1747 | E | EPC Solenoid Circuit Failure |
| P1751 | A | SS1 Functional Failure |
| P1756 | A | SS2 Functional Failure |
| P1767 | C | TCC Circuit Error |
| P1783 | B | Transmission Overheating |
| P1788 | G | 3-2T/CCS Solenoid Circuit Failure |
| P1789 | G | 3-2T/CCS Solenoid Circuit Failure |
| P1900 | F | Intermittent OSS Sensor Signal |
| (1) For complete list of engine performance fault codes, see appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. | ||
| (1) | For complete list of engine performance fault codes, see appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. |
DTC IDENTIFICATION