Diagnostic Instructions
DTC Descriptors
DTC P2759: Brake Band Pressure Control Solenoid Valve Control Circuit Shorted
DTC P2762: Brake Band Pressure Control Solenoid Valve Performance
DTC P2763: Brake Band Pressure Control Solenoid Valve Control Circuit Low Voltage
DTC P2764: Brake Band Pressure Control Solenoid Valve Control Circuit High Voltage
Diagnostic Fault Information
Circuit
| Short to Ground
| Open/High Resistance
| Short to Voltage
| Signal Performance
|
Signal
| P2763
| P2764
| P2764
| P2759, P2762
|
Low Reference
| --
| P2759, P2762, P2764
| P2759, P2762, P2764
| P2759, P2762, P2764
|
Typical Scan Tool Data
Circuit
| Short to Ground
| Open
| Short to Voltage
|
Operating Conditions:
Engine running, normal operating temperature
Parameter Normal Range:
0.1 A to 1.1 A
|
Signal
| 0 A
| 2.55 A
| 2.55 A
|
Low Reference
| --
| 2.55 A
| 1
|
1. Internal TCM damage may occur if shorted to B+
|
Circuit/System Description
Based on input speed and output speed signals, signals from the engine control module (engine speed and throttle opening) and vehicle speed, smooth lock-up control and slip is performed through the lock-up control solenoid (SLU). The SLU is linearly turned
ON and OFF. The lock-up clutch inside the torque converter is operated, and the pump impeller and turbine runner are connected. Through this, the engine and the automatic transmission are coupled and engine output is connected directly to the automatic transmission,
eliminating transmission loss. By sliding the lock-up clutch when lock-up is in the OFF range, extends the lock-up range to low vehicle speeds. It also suppresses a rise in engine speed and increases transmission efficiency, improving fuel economy and at the
same time, through the sliding of the lockup clutch, engine vibration can be absorbed by the torque converter.
Conditions for Running the DTC
P2759
| • | The ignition voltage is between 10.2 V and 15.5 V. |
| • | The engine speed is greater than 400 RPM for 2 seconds. |
| • | The transmission is not in emergency mode. |
| • | TCM communication is normal. |
| • | DTCs P2763 and P2764 are not set. |
P2762
| • | The ignition voltage is between 10.2 V and 15.5 V. |
| • | The engine speed is greater than 400 RPM for 2 seconds. |
| • | The transmission is not in emergency mode. |
| • | TCM communication is normal. |
| • | The Automatic Transmission Fluid Temperature is more than 20°C (68°F) |
| • | SLU current is more than 0.85 A. |
| • | SLU target current is not changed. |
P2763
| • | The ignition voltage is between 10.2 V and 15.5 V. |
| • | The engine speed is greater than 400 RPM for 2 seconds. |
| • | The transmission is not in emergency mode. |
| • | TCM communication is normal. |
P2764
| • | The ignition voltage is between 10.2 V and 15.5 V. |
| • | The engine speed is greater than 400 RPM for 2 seconds. |
| • | The transmission is not in emergency mode. |
| • | TCM communication is normal. |
Conditions for Setting the DTC
P2759
Deviation between commanded current and feedback current.
P2762
The TCM detects the error current more than 80 mA for 2.75 ms.
P2763
The TCM detects at least 5 times less than 23 mA current consumption of the SLU control circuit for 100 ms.
P2764
The TCM detects at least 5 times more than 1.333 A current consumption of the SLU control circuit for 100 ms.
Action Taken When the DTC Sets
P2759, P2762
| • | DTC P2759 and P2762 are Type B DTC. |
| • | The TCM turns OFF all solenoids. |
| • | The TCM allows the vehicle to operate only in second gear and "R" range after a stop. |
P2763, P2764
| • | DTCs P2763 and P2764 are Type B DTCs. |
| • | No self learning function. |
| • | The TCM turns OFF all solenoids. |
| • | The TCM allows the vehicle to operate only in second gear and "R" range after a stop. |
Conditions for Clearing the DIC/DTC
P2759, P2762
| • | DTC P2759 and P2762 are Type B DTC. |
| • | The TCM detects the error current less than 50 mA for 2.75 ms. |
P2763, P2764
| • | DTCs P2763 and P2764 are Type B DTCs. |
| • | The current consumption of the SLU control circuit is between 0.1 A and 1.1 A for 500 ms. |
Diagnostic Aids
When attempting to set solenoid electrical DTCs, ensure the TCM is warmed up and the transmission is operated in 2nd gear long enough to ensure a 3°C (5°F) increase in TCM substrate temperature. This will place the TCM in the optimal condition
to test solenoid electrical DTCs.
Reference Information
Schematic Reference
Automatic Transmission Controls Schematics
Connector End View Reference
Component Connector End Views
Electrical Information Reference
Description and Operation
Transmission Component and System Description
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
- Ensure the transmission fluid temperature is between 50-80°C (122-176°F).
- Operate the vehicle in 2nd gear long enough to ensure at least a 3°C (5°F) rise in transmission fluid temperature, then operate the vehicle in Park for 5 s.
- Observe the scan tool data TCC PC Solenoid Valve Current parameter, the reading should be between 0.1-1.1 A.
Circuit/System Testing
Command the TCC Solenoid Valve increase and decrease with a scan tool. The value should rise from 0.1 A - 1.1 A and return to 0.1 A.
| ⇒ | If the value does not change, turn ignition OFF, remove the K71 Transmission Control Module (TCM). Connect a test lamp between the low reference circuit terminal 4 (X2) at the K71 Transmission Control Module (TCM) and the voltage supply component
circuit terminal 9 (X2) at the K71 Transmission Control Module (TCM). Command the TCC Solenoid Valve increase and decrease with a scan tool. The test lamp has to illuminate brighter with increasing current. |
| ⇒ | If the test lamp always illuminates or always does not illuminate, replace the K71 Transmission Control Module (TCM). |
Component Testing
Static Test
- Ignition OFF, remove the K71 Transmission Control Module (TCM).
- Test for 5-5.6 Ω at 20°C (68°F) between the low reference circuit terminal 4 (X2) and the voltage supply circuit terminal 9 (X2).
| ⇒ | If less than the specified range, test the wiring harness for internal short. If the circuit test normal, replace the Q27C Pressure Control (PC) Solenoid Valve. |
- Test for infinite resistance between each terminal and the low reference circuit terminal 4 (X2) and also to the voltage supply circuit terminal 9 (X2).
| ⇒ | If less than the specified range, replace the wiring harness. |
- If all circuit test normal, perform the control solenoid valve inspection
Control Solenoid Valve Inspection.
| ⇒ | If the inspection test normal, replace the control valve body. |
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the diagnostic procedure.
