Suzuki XL7 2007 Service Manual page 1548

5A-138 Automatic Transmission:
7. Inspect the control valve body assembly for the
following conditions. The conditions should not be
found.
– Stuck lock up relay valve
– Stuck lock up control valve
– Stuck TCC check valve
– Stuck secondary regulator valve
– Stuck solenoid relay valve
– Stuck TCC lock up PC solenoid valve assembly
Refer to "Control Valve Rear Body Disassemble"
and "Middle Control Valve Body Disassemble".
➢ If any of the above conditions are found, replace
the valve body assembly. Refer to "Control Valve
Body Replacement" procedure.
8. Verify that the control valve body has been serviced
within the past 3 months.
➢ If the control valve body has not been serviced,
replace the control valve body assembly. Refer to
"Control Valve Body Replacement" procedure.
➢ If all circuits and components test normal, replace
the transmission.
9. If all circuits and components test normal, replace
the transmission.
Repair Instructions
Perform the "Diagnostic Repair Verification - Vehicle
Diagnostic Information: " after completing the diagnostic
procedure.
DTC P0742
Diagnostic Instructions
• Perform the "Diagnostic System Check - Vehicle
Diagnostic Information: " prior to using this diagnostic
procedure.
• Review "Strategy Based Diagnosis: " for an overview
of the diagnostic approach.
• "Diagnostic Procedure Instructions - Vehicle
Diagnostic Information: " provides an overview of
each diagnostic category.
DTC Descriptor
DTC P0742: Torque Converter Clutch (TCC) System -
Stuck On
Circuit/System Description
The transmission control module (TCM) controls the
torque converter clutch (TCC) lock up pressure control
solenoid valve. The solenoid directs the hydraulic fluid
for TCC apply and release. When the TCC is released,
the engine is coupled by fluid to the transmission.
Conditions for Running the DTC
• No Throttle Position (TP) Sensor DTC P0120
• No Transmission Range (TR) Switch DTC's P0706,
P0707, or P0708
• No Transmission Fluid Temperature (TFT) Sensor
DTC's P0711, P0712, or P0713
• No Speed Sensor DTC's P0717, P0722, P0727
• No Pressure Control (PC) Solenoid DTC's P0962,
P0963, P0966, P0967, P0970, or P0971
• No Shift Solenoid (SS) Control Circuit DTC's P0973,
P0974, P0976, P0977, P0979, P0980, P0982, P0983,
P0985, or P0986
• No Transmission Torque Delivered Circuit DTC P2637
• No Communications DTC's U0100 or U2104
• Engine speed is greater than 400 RPM
• Input Speed is less than 3000 RPM
• Range equals D, M, or L for 8 seconds
• Transmission oil temperature is greater than 20°C
• Engine torque is 46 - 240 Ω
• The ignition voltage is greater than 10.5 volts
Conditions for Setting the DTC
Engine speed minus input speed is less than 50 RPM for
12 seconds when the TCC is commanded off. Low
torque converter slip.
Action Taken When the DTC Sets
The transmission will operate in 5th gear in D range, 2nd
gear in L range.
Conditions for Clearing the DTC
DTC P0742 is a Type A DTC
Diagnostic Aids
Improper transmission fluid level may cause DTC P0742
to set. Refer to the "Transmission Fluid Check"
procedure.
Reference Information
Schematic Reference
"Automatic Transmission Controls Schematics"
Connector End View Reference
• "Automatic Transmission Inline Harness Connector
End View"
• "Automatic Transmission Internal Connector End
Views"
• "Automatic Transmission Related Connector End
Views"
Electrical Information Reference
• "Circuit Testing: "
• "Connector Repairs: "
• "Testing for Intermittent Conditions and Poor
Connections: "
• "Wiring Repairs: "