DTC P2725 or P2728-P2730
| DTC P2725 or P2728-P2730 |
| Diagnostic Instructions |
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Perform the
Diagnostic System Check - Vehicle
prior to using this diagnostic procedure.
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Review
Strategy Based Diagnosis
for an overview of the diagnostic approach.
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Diagnostic Procedure Instructions
provides an overview of each diagnostic category.
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| DTC Descriptors |
DTC P2725
Brake Band Pressure Control Solenoid Valve Control Circuit Shorted
DTC P2728
Brake Band Pressure Control Solenoid Valve Performance
DTC P2729
Brake Band Pressure Control Solenoid Valve Control Circuit Low Voltage
DTC P2730
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 |
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Signal
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P2729
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P2730
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P2730
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P2725, P2728
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Low Reference
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-
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P2725, P2728, P2730
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P2725, P2728, P2730
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P2725, P2728, P2730
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| Typical Scan Tool Data |
Pressure Control Solenoid Valve
| Circuit | Short to Ground | Open | Short to Voltage |
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Operating Conditions:
Engine running, normal operating temperature
Parameter Normal Range: 0.1-1.1 A |
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Signal
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0 A
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2.55 A
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2.55 A
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Low Reference
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-
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2.55 A
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1
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1. Internal TCM damage may occur if shorted to B+
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| Circuit/System Description |
The shift control solenoid (SLB1) is installed on the front valve body. The solenoid linearly controls hydraulic pressure in response to signals output from the transmission control module (TCM). Through this, the SLB1 controls operating hydraulic pressure to the brake for smooth shifting. According to each shift control solenoid assembly, the transmission shifts from 1st gear into 6th gear and vice versa. As a fail-safe function, if any shift control solenoid assembly abnormality occurs, the TCM will disable the current to the solenoids.
| Conditions for Running the DTC |
P2725
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The ignition voltage is 10.2-15.5 V.
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The engine speed is greater than 400 RPM for 2 s.
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The transmission is not in emergency mode.
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Driving in D range.
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TCM communication is normal.
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DTCs P2729 and P2730 are not set.
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P2728
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The ignition voltage is 10.2-15.5 V.
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The engine speed is greater than 400 RPM for 2 s.
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The transmission is not in emergency mode.
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Driving in D range.
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TCM communication is normal.
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The automatic transmission fluid temperature is more than 20°C (68°F).
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SLB1 current is more than 0.85 A.
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SLB1 current is not changed.
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P2729
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The ignition voltage is 10.2-15.5 V.
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The engine speed is greater than 400 RPM for 2 s.
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The transmission is not in emergency mode.
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Driving in D range.
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TCM communication is normal.
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DTC P2730 is not set.
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P2730
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The ignition voltage is 10.2-15.5 V.
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The engine speed is greater than 400 RPM for 2 s.
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The transmission is not in emergency mode.
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Driving in D range.
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TCM communication is normal.
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DTC P2729 is not set.
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| Conditions for Setting the DTC |
P2725
Deviation between commanded current and feedback current.P2728
The TCM detects the error current more than 80 mA for 2.75 ms.P2729
The TCM detects at least 5 times less than 23 mA current consumption of the SLB1 control circuit for 100 ms.P2730
The TCM detects at least 5 times more than 1.333 A current consumption of the SLB1 control circuit for 100 ms.| Action Taken When the DTC Sets |
P2725, P2728
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DTC P2725 and P2728 are Type B DTC.
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The TCM turns OFF all solenoids.
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The TCM allows the vehicle after a stop to operate only in the second gear and “R” range.
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P2729, P2730
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DTCs P2729 and P2730 are Type B DTCs.
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No self learning function.
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The TCM turns OFF all solenoids.
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The TCM allows the vehicle after a stop to operate only in the second gear and “R” range.
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| Conditions for Clearing the DTC |
P2725, P2728
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DTC P2725 and P2728 are Type B DTC.
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The TCM detects the error current less than 50 mA for 2.75 ms.
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P2729, P2730
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DTCs P2729 and P2730 are Type B DTCs.
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The current consumption of the SLB1 control circuit is 0.1-1.1 A for 500 ms.
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| 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 under the optimal conditions to test solenoid electrical DTCs.
| Reference Information |
Schematic Reference
Automatic Transmission Controls Schematics
Connector End View Reference
Component Connector End Views
Electrical Information Reference
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Circuit Testing
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Connector Repairs
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Testing for Intermittent Conditions and Poor Connections
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Wiring Repairs
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Description and Operation
Transmission Component and System Description
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References
| Circuit/System Verification |
| 1. |
Ensure the transmission fluid temperature is between 50-80°C (122-176°F).
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| 2. |
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.
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| 3. |
Observe the scan tool Brake Band Pressure Control Solenoid Valve Current parameter. The reading should be between 0.1-1.1 A.
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| Circuit/System Testing |
Command the Shift Brake Pressure Control Solenoid Valve with a scan tool. The value should change from 0.0-1.0 A.
| Component Testing |
Static Test
| 1. |
Ignition OFF, remove the K71 Transmission Control Module.
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| 2. |
Test for 5-5.6 Ω at 20°C (68°F) between the low reference circuit terminal 16 X2 and the voltage supply circuit terminal 21 X2.
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| 3. |
If less than the specified range, test the wiring harness for internal short. If the circuit test normal, replace the Q27E Pressure Control Solenoid Valve 5.
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| 4. |
Test for infinite resistance between each terminal and the low reference circuit terminal 16 X2 and also to the voltage supply circuit terminal 21 X2.
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| 5. |
If less than the specified range, replace the wiring harness.
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| 6. |
If all circuit test normal, perform the
Control Solenoid Valve Inspection (M36 and MXE)
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| 7. |
If the inspection test normal, replace the control valve body.
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| Repair Instructions |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
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Control valve body replacement-Refer to
Control Valve Body Replacement
.
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TCM-Refer to
Control Module References
.
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Wiring harness-Refer to
Automatic Transmission Wiring Harness Replacement
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