Suzuki XL7 2007 Service Manual page 1541

12. Inspect the control valve body assembly for the
following conditions. Refer to "Control Valve Rear
Body Disassemble" and "Middle Control Valve Body
Disassemble". The conditions should not be found.
– Stuck U1 shift valve
– Stuck M1 shift valve
– Stuck U2 shift valve
– Stuck shift pressure relay valve
– Stuck neutral relay valve
– Stuck line pressure control solenoid valve
assembly
➢ If any of the above conditions are found, replace
the valve body assembly. Refer to "Control Valve
Body Replacement" procedure.
13. 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".
14. 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 P0734
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 P0734: Incorrect 4th Gear Ratio
Circuit/System Description
The transmission control module (TCM) calculates the
actual gear ratio based on input speed sensor (ISS) and
output speed sensor (OSS) data. The actual gear ratio is
compared to the expected gear ratio for each
commanded gear.
If the TCM detects an incorrect 4th gear ratio while in 4th
gear, DTC P0734 sets.
Automatic Transmission:
Conditions for Running the DTC
• No Throttle Position (TP) Sensor DTC P0120.
• No Transmission Range (TR) Switch DTCs P0706,
P0707, or P0708.
• No Transmission Fluid Temperature (TFT) Sensor
DTCs P0711, P0712, or P0713.
• No Speed Sensor DTCs P0717, P0722, or P0727.
• No Pressure Control (PC) Solenoid DTCs P0962,
P0963, P0966, P0967, P0970, or P0971.
• No Shift Solenoid (SS) Control Circuit DTCs P0973,
P0974, P0976, P0977, P0979, P0980, P0982, P0983,
P0985, or P0986.
• No Transmission Torque Delivered Circuit DTC
P2637.
• No Communications DTCs U0100 or U2104.
• Output speed greater than one half that of the input
speed.
• Input speed is greater than 400 RPM.
• Current gear equals 4th.
• Transmission fluid temperature (TFT) is greater than
20°C (68°F).
• Engine speed is greater than 400 RPM.
• Throttle position greater than 10 percent.
• Shift range equals D, M, or L for at least 2 seconds.
• Ignition voltage is greater than 10.5 volts.
Conditions for Setting the DTC
The following condition is met for 1 second, 12
occurrences.
The current ratio and the expected ratio differ by more
than 20 percent.
Action Taken When the DTC Sets
• DTC P0734 is a Type A DTC.
• 5th gear in D.
• 2nd gear in L.
• Limit engine torque to 150 N⋅m (111 lb ft).
Conditions for Clearing the DTC
DTC P0734 is a Type A DTC.
Diagnostic Aids
Improper transmission fluid level may cause DTC P0734
to set. Refer to the "Transmission Fluid Check"
procedure.
5A-131