Automatic Transmission - 6F35
Diagnostic Routine K
Diagnostic Overview
P0770, P0773, P0774
Refer to Wiring Diagram Set 30 for schematic and connector information Electrical Diagrams.
Normal Operation and Fault Conditions
SSE (Shift Solenoid E) controls the multiplexing of the SSD (Shift Solenoid D) low/reverse and overdrive clutch. If SSE (Shift Solenoid E) fails off (no pressure) then 1st gear is failed to 4th gear. If clutch select valve 2 sticks in the default position then 1st gear with engine braking is failed to 4th gear and reverse is failed to neutral.
The following symptoms may accompany these DTCs (Diagnostic Trouble Codes):
When SSE (Shift Solenoid E) is failed off (no pressure):
- Customer might notice 4th gear drive away when 1st gear is commanded.
- Failed off (no pressure) then 1st gear with engine braking is disabled.
- May or may not notice 2nd gear provided when 1st gear selected in low manual range.
- Harsh reverse engagements since low/reverse clutch does not apply in neutral or drive in this failure mode.
When SSE (Shift Solenoid E) is failed on (pressure):
- High side is turned off.
- Poor launch performance due to 5th gear drive away.
- Harsh engagements.
- No TCC (Torque Converter Clutch) apply.
DTC Fault Trigger Conditions
Visual Inspection and Diagnostic Pre-checks
- Inspect for damaged wiring harness
- Inspect for loose or damaged connectors
Pinpoint Test
NOTE: If the scan tool is unable to communicate with the TCM (Transmission Control Module), REFER to Diagnostic Routine AB: The Transmission Control Module (TCM) Does Not Respond To The Scan Tool Diagnostic Routine AB.
1. INSPECT FOR CORROSION OR TERMINAL DAMAGE
1. Ignition OFF.
2. Disconnect 6F35 Transmission C1520A.
3. Disconnect TCM (Transmission Control Module).
4. Use a mirror to inspect both ends of each connector for damage or pushed out pins, corrosion, loose wires and missing or damaged seals.
Are both connectors free of any damage, corrosion, pushed-out terminals, loose wires, or missing or damaged seals?
2. CHECK THE SOLENOID CIRCUIT FOR AN OPEN
1. Measure:
Is the resistance less than 5 ohms?
3. CHECK THE SOLENOID CIRCUIT FOR A SHORT TO GROUND
1. Measure:
Is the resistance greater than 10,000 ohms?
4. CHECK THE SOLENOID CIRCUIT FOR A SHORT TO VOLTAGE
1. Ignition ON.
2. Measure:
Is any voltage present?
5. CHECK THE RESISTANCE OF THE SOLENOID FIELD CIRCUIT
1. Ignition OFF.
2. Measure and record:
3. Compare the recorded resistance value to the chart below.
Temperature to Resistance - SSE (Shift Solenoid E)
Is the resistance within specifications?
6. CHECK THE SOLENOID BODY LEADFRAME FOR AN OPEN
1. Remove the solenoid body leadframe. REFER to Solenoid Body Leadframe .
2. Measure:
Is the resistance less than 5 ohms?
7. CHECK THE TCM (Transmission Control Module) FOR CORRECT OPERATION
1. Prior to reconnecting any previously disconnected connector:
- inspect connector(s) (including any inline connectors) for pushed-out, loose or spread terminals and loose or frayed wire connections at terminals.
- inspect wire harness for any damaged, pinched, cut or pierced wires.
2. Connect the 6F35 Transmission C1520A.
3. Connect the TCM (Transmission Control Module).
4. Ignition ON.
5. Using a scan tool, perform TCM (Transmission Control Module) self-test to retrieve DTCs (Diagnostic Trouble Codes).
Is the concern still present?
