DTC P0778 or P0965-P0967
| DTC P0778 or P0965-P0967 |
| 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 P0778
Pressure Control Solenoid Valve 1 System Performance
DTC P0965
Pressure Control Solenoid Valve 1 System Performance
DTC P0966
Pressure Control Solenoid Valve 1 Control Circuit Low Voltage
DTC P0967
Pressure Control Solenoid Valve 1 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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P0966
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P0778, P0967
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P0778, P0967
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P0965
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Low Reference
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-
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P0778, P0965, P0967
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P0778, P0965, P0967
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P0778, P0965, P0967
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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 (SLC1) is installed on the front valve body. The solenoid linearly control hydraulic pressure in response to signals output from the transmission control module TCM. Through this, the SLC1 controls operating hydraulic pressure to the clutch 1 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 |
P0778
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The ignition voltage is between 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 P0966 and P0967 are not set.
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P0965
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The ignition voltage is between 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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SLC1 current is more than 0.85 A.
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SLC1 target current is not changed.
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P0966
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The ignition voltage is between 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 P0967 is not set.
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P0967
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The ignition voltage is between 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 P0966 is not set.
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| Conditions for Setting the DTC |
P0778
Deviation between commanded current and feedback current.P0965
The TCM detects the error current more than 80 mA for 2.75 ms.P0966
The TCM detects at least 5 times less than 23 mA current consumption of the SLC1 control circuit for 100 ms.P0967
The TCM detects at least 5 times more than 1.333 A current consumption of the SLC1 control circuit for 100 ms.| Action Taken When the DTC Sets |
P0778, P0965
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DTC P0965 is a 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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P0966, P0967
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DTCs P0966 and P0967 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 |
P0778, P0965
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DTC P0967 is a 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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P0966, P0967
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DTCs P0966 and P0967 are Type B DTCs.
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The current consumption of the SLC1 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 for scan tool information
| 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's Clutch Pressure Control Solenoid Valve 1 parameter. The reading should be between 0.1 and 1.1 A.
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| Circuit/System Testing |
Command the Clutch Pressure Control Solenoid Valve 1 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 10 X2 and the voltage supply circuit terminal 11 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 Q27A Pressure Control Solenoid Valve 1.
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| 4. |
Test for infinite resistance between each terminal and the low reference circuit terminal 10 X2 and also to the voltage supply circuit terminal 11 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
for replacement, setup, and programming.
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TCM-Refer to
Control Module References
for replacement, setup and programming.
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Perform the
Transmission Adaptive Functions
.
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Wiring harness-Refer to
Automatic Transmission Wiring Harness Replacement
for replacement.
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