Allison

DIAGNOSTIC RESPONSE:
DNS, SOL OFF (hydraulic default)

CIRCUIT DESCRIPTION:
Pressure Control Solenoid 1 (PCS1) is a normally open solenoid used to apply the C1 clutch in 1st – 4th range. The Transmission Control Module (TCM) commands the solenoid OFF to produce hydraulic pressure in the clutch apply circuit. When PCS1 is commanded ON, the C1 clutch is released. The TCM sends control current to PCS1 from High Side Driver 2 (HSD2) via wire 171 . HSD2 is continuously ON unless the TCM detects a fault condition. The TCM regulates the amount of current to PCS1 by switching PCS1 low side driver ON and OFF. Wire 136 completes the circuit between PCS1 and its low side driver. DTC P2730 indicates that the TCM has detected a failed low condition in the PCS1 electrical circuit. The condition may exist in the high side (wire 171) or low side (wire 136).

CONDITIONS FOR RUNNING THE DTC:
TCM initialized normally and engine speed above 200 rpm.

CONDITIONS FOR SETTING THE DTC:
This DTC sets when the TCM detects PCS1 low side driver has been detected in a failed high state.

ACTION TAKEN WHEN THE DTC SETS:
When DTC P2730 is active:
1. If failure occurs while in a forward range, then shifts to another forward range. If failure occurs while in Neutral (N), the transmission remains in Neutral (N). If failure occurs while in Reverse (R), the transmission remains in Reverse (R) or shifts to Neutral (N). Once range is attained, transmission will be locked in range. There is no response to shift selector requests.
2. DTC is stored in the TCM history.
3. The TCM inhibits Torque Converter Clutch (TCC) engagement.
4. The CHECK TRANS light illuminates.
5. The TCM freezes shift adapts (DNA).

CONDITIONS FOR CLEARING THE DTC:
Use the diagnostic tool to clear the DTC from the TCM history. The TCM automatically clears the DTC from the TCM history if the vehicle completes 40 warm-up cycles without failure.

DIAGNOSTIC AIDS:
DTC P2730 can be caused by:
1. PCS1 issues such as:
– W136 shorted to another wire in chassis harness.
– W136 (terminal 4 of 20-way) shorted to another wire in internal transmission harness.
– PCS1 defective.
2. Broken or defective connector assemblies allowing pushed back pins to short together.
3. Unlocked connectors, missing seal plugs allowing moisture in connectors.
4. Defective TCM.

Review applicable information in Control System and Transmission Specifications to find additional circuit specification, system and connector diagrams, and troubleshooting tips.

DIAGNOSTIC RESPONSE:
Inhibit retarder operation

CIRCUIT DESCRIPTION:
Pressure Control Solenoid 5 (PCS5) is a normally closed solenoid used to apply the retarder solenoid or differential lock solenoid (3700 models). The Trans mission Control Module (TCM) command the solenoid ON to produce hydraulic pressure in the control circuit. When PCS5 is commanded OFF, the control circuit is deactivated. The TCM sends control current to PCS5 from High Side Driver 3 (HSD3) via wire 131. HSD3 is continuously ON unless the TCM detects a fault condition. The TCM regulates the amount of current to PCS5 by switching PCS5 low side driver ON and OFF. Wire 115 completes the circuit between PCS5 and its low side driver. DTC P2736 indicates that the TCM has detected a high resistance or open condition in the low side of the PCS5 electrical circuit.

CONDITIONS FOR RUNNING THE DTC:
TCM initialization normally and engine speed above 200 rpm.

CONDITIONS FOR SETTING THE DTC:
This DTC sets when the TCM detects PCS5 low side driver has been detected in a failed open state.

ACTION TAKEN WHEN THE DTC SETS:
When DTC P2736 is active:
1. For 7-speed models, limit ranges to Reverse (R), Neutral (N) and ranges 2-6 operation.
2. TCM commands retarder OFF.
3. The TCM inhibits TCC engagement.
4. DTC is stored in the TCM history.
5. The CHECK TRANS light illuminates.
6. The TCM freezes shift adapts (DNA).

CONDITIONS FOR CLEARING THE DTC:
Use the diagnostic tool to clear the DTC from the TCM history. The TCM automatically clears the DTC from the TCM history if the vehicle completes 40 warm-up cycles without failure.

DIAGNOSTIC AIDS:
DTC P2736 can be caused by:
1. PCS5 issues such as W115 high resistance or open circuit in the chassis harness.
2. Defective PCS5.
3. Unlocked connectors, expanded terminals, poor pin crimps or unlocked pins causing high resistance or open circuit.
4. Defective TCM.

Review applicable information in Control System and Transmission Specifications to find additional circuit specifications, system and connector diagrams, and troubleshooting tips.

DIAGNOSTIC RESPONSE:
Allow 2 through 6, N, R. Inhibit retarder and TCC operation

CIRCUIT DESCRIPTION:
Pressure Control Solenoid 5 (PCS5) is a normally closed solenoid used to apply the retarder solenoid or differential lock solenoid (3700 models). The Transmission Control Module (TCM) commands the solenoid ON to produce hydraulic pressure in the control circuit. When PCS5 is commanded OFF, the control circuit is deactivated. The TCM sends control current to PCS5 from High Side Driver 3 (HSD3) via wire 131. HSD3 is continuously ON unless the TCM detects a fault condition. The TCM regulates the amount of current to PCS5 by switching PCS5 low side driver ON and OFF. Wire 115 completes the circuit between PCS5 and its low side driver. DTC P2738 indicates that the TCM has detected a short-to-ground condition in the low side of the PCS5 electrical circuit.

CONDITIONS FOR RUNNING THE DTC:
TCM initialized normally and engine speed above 200 rpm.

CONDITIONS FOR SETTING THE DTC:
This DTC sets when the TCM detects PCS5 low side driver has been detected in a failed low state.

ACTION TAKEN WHEN THE DTC SETS:
When DTC P2738 is active:
1. For 7-speed models, limit ranges to Reverse (R), Neutral (N) and ranges 2-6 operation.
2. TCM commands retarder OFF.
3. The TCM inhibits TCC engagement.
4. DTC is stored in the TCM history.
5. The CHECK TRANS light illuminates.
6. The TCM freezes shift adapts (DNA).

CONDITIONS FOR CLEARING THE DTC:
Use the diagnostic tool to clear the DTC from the TCM history. The TCM automatically clears the DTC from the TCM history if the vehicle completes 40 warm-up cycles without failure.

DIAGNOSTIC AIDS:
DTC P2738 can be caused by:
1. PCS5 issues such as W115 shorted to another wire in the chassis harness or to chassis ground.
2. Defective PCS5.
3. Broken or defective connector assemblies allowing pushed back pins to short together.
4. Unlocked connectors, missing seal plugs allowing moisture in connectors.
5. Defective TCM.

Review applicable information in Control System and Transmission Specifications to find additional circuit specifications, system and connector diagrams, and troubleshooting tips.

DIAGNOSTIC RESPONSE:
Inhibit retarder operation

CIRCUIT DESCRIPTION:
Pressure Control Solenoid 5 (PCS5) is a normally closed solenoid used to apply the retarder solenoid or differential lock solenoid (3700 models). The Transmission Control Module (TCM) commands the solenoid ON to produce hydraulic pressure in the control circuit. When PCS5 is commanded OFF, the control circuit is deactivated. The TCM sends control current to PCS5 from High Side Driver 3 (HSD3) via wire 131. HSD3 is PCS5 by switching PCS5 low side driver ON and OFF. Wire 115 completes the circuit between PCS5 and its low side driver. DTC P2739 indicates that the TCM has detected a short-to-ground condition in the low side of the PCS5 electrical circuit.

CONDITIONS FOR RUNNING THE DTC:
TCM initialized normally and engine speed above 200 rpm.

CONDITIONS FOR SETTING THE DTC:
This DTC sets when the TCM detects PCS5 low side driver has been detected in a failed high state.

ACTION TAKEN WHEN THE DTC SETS:
When DTC P2739 is active:
1. For 7-speed models, limit ranges to Reverse (R), Neutral (N) and ranges 2-6 operation.
2. TCM commands retarder OFF.
3. The TCM inhibits TCC engagement.
4. DTC is stored in the TCM history.
5. The CHECK TRANS light illuminates.
6. The TCM freezes shift adapts (DNA).

CONDITIONS FOR CLEARING THE DTC:
Use the diagnostic tool to clear the DTC from the TCM history. The TCM automatically clears the DTC from the TCM history if the vehicle completes 40 warm-up cycles without failure.

DIAGNOSTIC AIDS:
DTC P2739 can be caused by:
1. PCS5 issues such as W115 shorted to another wire in the chassis harness.
2. Defective PCS5.
3. Broken or defective connector assemblies allowing pushed back pins to short together.
4. Unlocked connectors, missing seal plugs allowing moisture in connectors.
5. Defective TCM.

Review applicable information in Control system and Transmission Specifications to find additional specifications, system and connector diagrams, and troubleshooting tips.

DIAGNOSTIC RESPONSE:
None

CIRCUIT DESCRIPTION:
A retarder Transmission Fluid Temperature (TFT) sensor monitors retarder cavity fluid temperature. The sensor consists of a thermistor that varies its resistance value based on the temperature of the fluid in the retarder housing. The Transmission Control Module (TCM) supplies a 5V reference voltage signal into a voltage-sensing network that is connected to one side of the retarder temperature sensor on W175. The other side of the retarder temperature sensor is connected to the TCM analog ground W158.

The resistance value of the retarder temperature sensor determines the voltage drop in the retarder temperature sensor circuit. As resistance changes, the voltage drop across the thermistor will also change and vary the retarded temperature sensor input voltage on wire 175. When retarder fluid is cold, the retarder temperature sensor resistance is high, and produces a large voltage drop across the retarder temperature sensor circuit. The TCM, therefore, detects a high retarder temperature sensor input voltage during cold conditions. As the retarder fluid temperature warms to normal operating temperature, the resistance decreases and produces a smaller voltage drop across the retarder temperature sensor. As a result, the TCM detects a lower sensor input voltage on W175 during hot oil conditions. The TCM uses retarder temperature information to restrict retarder operation and reduce fluid temperature when a retarder over heat condition is detected.

CONDITIONS FOR RUNNING THE DTC:
1. After TCM initializes normally and engine speed is above 200 rpm for more than 5 seconds, this DTC test runs at 0.25 second intervals.
2. Retarder autodetected or forced present by CMC (Override Retarder Autodetected).
3. This test is disabled for this ignition cycle when a failure is reported for this DTC, DTC P2742 or DTC P2743.
4. The TCM detects retarder oil temperature less than 201°C (394°F) for more than 10 seconds.

CONDITIONS FOR SETTING THE DTC:
Retarder TCT sensor signal for fluid temperature higher than 166°C (331°F for more than 10 seconds.

NOTE: The TCM is detecting voltage on W175. An unusually low input voltage implies low thermistor resistance, which corresponds to an unusually high retarder oil temperature measurement.

ACTION TAKEN WHEN THE DTC SETS:
When DTC P2740 is active, the following conditions occur:
1. The TCM does not illuminate the CHECK TRANS light.
2. DTC is stored in TCM history.
3. Retarder command reduced.

CONDITIONS FOR CLEARING THE DTC/CHECK TRANS LIGHT:
The DTC goes inactive and the TCM cancels the DTC active actions when the retarder TFT sensor signals that the fluid temperature is below 166°C (331°F) for 10 seconds or more.

Use the diagnostic tool to clear the DTC from the TCM history. The TCM automatically clears the DTC from the TCM history if the vehicle completes 40 warm-up cycles without failure.

DIAGNOSTIC AIDS:
NOTE: DTC may occur in vehicles with history or DTC P2742. Follow the diagnostics steps in DTC P2742 before proceeding to the diagnostic steps for this DTC. Repairing the condition that sets DTC P2742 will likely eliminate this DTC.

DTC P2740 may be caused by:
1. Incorrect transmission fluid fill.
2. Defective retarder TFT sensor.
3. Defective TCM.
4. Transmission fluid temperature in retarder reaching over 166°C (331 °F) for 10 seconds.
5. Inadequate or obstructed vehicle cooling system.
6. Non-bypassed engine coolant thermostats that are not opening in time may cause overheat condition for transmission fluid temperature. Monitor retarder fluid temperature using diagnostic tool and review transmission overheat and retarder information in General Troubleshooting of Performance Complaints.

The retarder TFT sensor resistance is available on the diagnostic tool Data Monitor grid. Prior to ‘Connect’ for diagnostic tool, check the ‘Troubleshoot Specific Problem’ box under “Connection Options” and then check the ‘Sensor, Voltage, Ohms, and Counts Data’ box.

Check if retarder TFT sensor resistance is increasing, decreasing, or stationary with fluctuations in fluid temperature. Normal circuit operation is indicated if sensor resistance decreases as fluid temperature increases, and sensor resistance increases as fluid temperature decreases.

Using the diagnostic tool, monitor the transmission fluid temperature to verify that it rises in cycles and then stabilizes.

Monitor and record snapshot fluid temperature.

Follow transmission overheat troubleshooting in General Troubleshooting of Performance Complaints for problems: OVERHEATING INDICATED BY DTCs P0218, P2740 OR FLUID CONDITION, and if equipped with a retarder follow problem RETARDER FEELS WEAK.

Review applicable information in Control System and Transmission Specifications to find additional circuit specifications, system and connector diagrams, and troubleshooting tips.

DIAGNOSTIC RESPONSE:
Use default retarder temperature values

CIRCUIT DESCRIPTION:
A retarder Transmission Fluid Temperature (TFT) sensor monitors retarder cavity fluid temperature. The sensor consists of a thermistor that varies its resistance value based on the temperature of the fluid in the retarder housing. The Transmission Control Module (TCM) supplies a 5V reference voltage signal into a voltage-sensing network that is connected to the TCM analog ground W158.

The resistance value of the retarder temperature sensor determines the voltage drop in the retarder temperature sensor circuit. As resistance changes, the voltage drop across the thermistor will also change which likewise varies the sensor input voltage on wire 175. When retarder fluid is cold the sensor resistance is high, which produces a large voltage drop across the temp sensor circuit. The TCM, therefore, detects a high sensor input voltage during cold conditions. As the retarder fluid temperature warms to normal operating temperature, the resistance decreases producing a smaller voltage drop across the temp sensor. As a result, the TCM detects a lower sensor input voltage on W175 during hot oil conditions. The TCM uses retarder temperature information to restrict retarder operation and thus reduce fluid temperature whenever a retarder over-heat condition is detected.

CONDITIONS FOR RUNNING THE DTC:
1. After TCM initializes normally and engine speed is above 200 rpm for more than 5 seconds, the DTC test runs at 0.25 second intervals.
2. Retarder autodetected or forced present by CMC (Override Retarder Autodetect).
3. This test is disabled for this ignition cycle when a failure is reported for this DTC or DTC P2743.

CONDITIONS FOR SETTING THE DTC:
The TCM detects retarder oil temperature greater than 201°C (394°F) for more than 10 seconds.

NOTE: The TCM is detecting voltage on W175. An unusually low input voltage implies low thermistor resistance, which corresponds to an unusually high retarder oil temperature measurement.

ACTION TAKEN WHEN THE DTC SETS:
When DTC P2742 is active, the following conditions occur:
1. The TCM does not illuminate the CHECK TRANS light.
2. DTC is stored in TCM history.
3. TCM uses default retarder temperature values.

CONDITIONS FOR CLEARING THE DTC/CHECK TRANS LIGHT:
Use the diagnostic tool to clear the DTC from the TCM history. The TCM automatically clears the DTC from the TCM history if the vehicle completes 40 warms-up cycles without failure.

DIAGNOSTICS AIDS
DTC P2742 may be caused by:
1. Incorrect transmission fluid fill.
2. W175 shorted to ground, or shorted to another wire in chassis harness.
3. Broken or defective connector assemblies that cause pins to short together.
4. Unlocked connectors, missing or damaged seals, missing seal plugs, that allow moisture into connectors.
5. Defective retarder TFT sensor.
6. Defective TCM.
7. Transmission fluid temperature in retarder reaching over 201°C (394°F) for 10 seconds.
8. Inadequate or obstructed vehicle cooling system.
9. Non-bypassed engine coolant thermostats that are not opening in time may cause overheat condition for transmission fluid temperature. Monitor retarder fluid temperature using diagnostic tool and review transmission overheat and retarder information in General Troubleshooting of Performance Complaints.

The retarder TFT sensor resistance is available on diagnostic tool Data Monitor grid. Prior to ‘Connect’ for diagnostic tool, check the ‘Troubleshooting Specific Problem’ box under the “Connection Options” and then check the ‘Sensor, Voltage, Ohms, and Counts Data’ box.

Check if retarder TFT sensor resistance is increasing, decreasing, or stationary with fluctuations in fluid temperature. Normal circuit operation is indicated if sensor resistance decreases as fluid temperature increases, and sensor resistance increases as fluid temperature decreases.

Refer to DTC P2740 and DTC P0218 or General Troubleshooting of Performance Complaints as guidelines for troubleshooting vehicle cooling issues.

Review applicable information in Control System and Transmission Specifications to find additional circuit specifications, system and connector diagrams, and troubleshooting tips.

DIAGNOSTIC RESPONSE:
Use default retarder temperature values

CIRCUIT DESCRIPTION:
A retarder Transmission Fluid Temperature (TFT) sensor monitors retarder cavity fluid temperature. The sensor consists of a thermistor that varies its resistance value based on the temperature of the fluid in the retarder housing. The Transmission Control Module (TCM) supplies a 5V reference voltage signal into a voltage-sensing network that is connected to one side of the retarder TFT sensor on W175. The other side of the retarder TFT sensor is connected to the TCM analog ground W158.

The resistance value of the retarder TFT sensor determines the voltage drop in the retarder TFT sensor circuit. As resistance changes, the voltage drop across the thermistor will also change and vary the retarder TFT sensor input voltage on wire 175. When retarder fluid is cold, the retarder TFT sensor resistance is high, and produces a large voltage drop across the retarder TFT sensor circuit. The TCM, therefore, detects a high retarder TFT sensor input voltage during cold conditions. As the retarder fluid temperature warms to normal operating temperature, the resistance decreases and produces a smaller voltage drop across the retarder TFT sensor. As a result, the TCM detects a lower retarder TFT sensor input voltage on W175 during hot oil conditions. The TCM uses retarder temperature information to restrict retarder operation and reduce fluid temperature when a retarder overheat condition is detected.

CONDITIONS FOR RUNNING THE DTC:
1. After TCM initializes normally and engine speed is above 200 rpm for more than 5 seconds, this DTC test runs at 0.25 second intervals.
2. Retarder autodetected or forced present by CMC (Override Retarder Autodetect).
3. This test is disabled for this ignition cycle when a failure is reported for this DTC or DTC P2742.

CONDITONS FOR SETTING THE DTC
The TCM detects retarder oil temperature less than -45°C (-49°F) for more than 10 seconds.

NOTE: The TCM is detecting voltage on W175. An unusually high input voltage implies high thermistor resistance, which corresponds to a low retarder oil temperature measurement.

ACTION TAKEN WHEN THE DTC SETS:
When DTC P2743 is active, the following conditions occur:
1. The TCM does not illuminate the CHECK TRANS light.
2. DTC is stored in TCM history.
3. TCM uses default retarder temperature values.

CONDITIONS FOR CLEARING THE DTC/CHECK TRAN LIGHT
Use the diagnostic tool to clear the DTC from the TCM history. The TCM automatically clears the DTC from the TCM history if the vehicle completes 40 warm-up cycles without failure.

DIAGNOSTIC AIDS:
NOTE: If DTC P2743 is accompanied by DTC P0713 or P2185, check for short to battery on W135, W154 and W175. Follow DTC P0713 steps first, if in history with this DTC.

DTC P2743 may be caused by:
1. Incorrect transmission fluid fill.
2. W175 shorted to another wire in chassis harness.
3. W175 open circuit in chassis harness.
4. W158 open circuit in chassis harness.
5. Broken or defective connector assemblies that cause pins to short together.
6. Unlocked connectors, missing or damaged seals, missing seal plugs that allow moisture into connectors.
7. Defective retarder TFT sensor.
8. Defective TCM.

The retarder TFT sensor resistance is available on the diagnostic tool Data Monitor grid. Prior to ‘Connect’ for diagnostic tool, check the ‘Troubleshoot Specific Problem’ box under “Connection Options” and then check the ‘Sensor, Voltage, Ohms, and Counts Data’ box.

Check if retarder TFT sensor resistance is increasing, decreasing, or stationary with fluctuations in fluid temperature. Normal circuit operation is indicated if sensor resistance decreases as fluid temperature increases, and sensor resistance increases as fluid temperature decreases.

Review applicable information in Control System and Transmission Specifications to find additional circuit specifications, system and connector diagrams, and troubleshooting tips.

DIAGNOSTIC RESPONSE:
Inhibit TCC operation

CIRCUIT DESCRIPTION:
The Torque Converter Clutch (TCC) Pressure Control Solenoid (PCS) is a normally closed solenoid used to apply the lockup clutch when specific engine and turbine speed conditions are met. The Transmission Control Module (TCM) commands the solenoid ON to produce hydraulic pressure in the lockup clutch apply circuit. When the TCC solenoid is commanded OFF, lockup clutch pressure is exhausted. The TCM sends control current to the TCC solenoid from High Driver 3 (HSD3) via wire 131. HSD3 is continuously ON unless the TCM detects a fault condition The TCM regulates the amount of current to the TCC solenoid by switching the TCC solenoid low side driver ON and OFF. Wire 137 completes the circuit between the TCC solenoid and its low side driver. DTC P2761 indicates that the DTC has detected a high resistance or an open condition in the low side of the TCC solenoid electrical circuit.

CONDITIONS FOR RUNNING THE DTC:
TCM initialized normally and engine speed above 200 rpm.

CONDITIONS FOR SETTING THE DTC:
This DTC sets when the TCM detects the TCC solenoid low side driver in a failed open state.

ACTION TAKEN WHEN THE DTC SETS:
When DTC P2761 is active:
1. The TCM inhibits TCC engagement.
2. DTC is store in the TCM history.
3. The CHECK TRANS light illuminates.
4. The TCM freezes shift adapts (DNA).

CONDITIONS FOR CLEARING THE DTC:
Use diagnostic tool to clear the DTC from the TCM history. The TCM automatically clears the DTC from the TCM history if the vehicle completes 4 warm-up cycles without failure.

DIAGNOSTIC AIDS:
DTC P2761 can be caused by:
1. TCC solenoid issues such as W137 high resistance or open circuit in the chassis harness.
2. W137 (terminal 12 of 20-way) high resistance or open circuit in the chassis harness.
3. Defective TCC solenoid.
4. Unlocked connectors, expanded terminals, poor pin crimps or unlocked pins causing high resistance or open circuit.
5. Defective TCM.

Review applicable information in Control System and Transmission Specifications to find additional circuit specifications, system and connector diagrams, and troubleshooting tips.

DIAGNOSTIC RESPONSE:
Inhibit TCC operation

CIRCUIT DESCRIPTION:
The Torque Converter Clutch (TCC) Pressure Control Solenoid (PCS) is a normally closed solenoid used to apply the lockup clutch when specific engine and turbine speed conditions are met. The Transmission Control Module (TCM) commands the solenoid ON to produce hydraulic pressure in the lockup clutch apply circuit. When the TCC solenoid is commanded OFF, lockup clutch pressure is exhausted. The TCM sends control current to the TCC solenoid from High Driver 3 (HSD3) via wire 131. HSD3 is continuously ON unless the TCM detects a fault condition The TCM regulates the amount of current to the TCC solenoid by switching the TCC solenoid low side driver ON and OFF. Wire 137 completes the circuit between the TCC solenoid and its low side driver. DTC P2761 indicates that the DTC has detected a short-to-battery condition in the low side of the TCC solenoid electrical circuit.

CONDITIONS FOR RUNNING THE DTC:
TCM initialized normally and engine speed above 200 rpm.

CONDITIONS FOR SETTING THE DTC:
This DTC sets when the TCM detects the TCC solenoid low side driver in a failed high state.

ACTION TAKEN WHEN THE DTC SETS:
When DTC P2763 is active:
1. The TCM inhibits TCC engagement.
2. DTC is stored in the TCM history.
3. The CHECK TRANS light illuminates.
4. The TCM freezes shift adapts (DNA).

CONDITONS FOR CLEARING THE DTC
Use diagnostic tool to clear the DTC from the TCM history. The TCM automatically clears the DTC from the TCM history if the vehicle completes 40 warm-up cycles without failure.

DIAGNOSTIC AIDS:
DTC P2763 can be cause by:
1. TCC solenoid circuit issues such as:
– W137 shorted to another wire in chassis harness.
– W137 (terminal 12 of 20-way) shorted to another wire internal transmission harness.
2. Broken or defective connector assemblies allowing pushed back pin to short together.
3. Unlocked connectors, missing seal plugs allowed moisture in connectors.
4. Defective TCM.

Review applicable information in Control System and Transmission Specifications to find additional circuit specifications, system and connector diagrams, and troubleshooting tips.