P0700 is a informative transmission code, about some
problem there; the P0733 and P0734 is the specific problem there.
I would first try changing the fluid and filter. Although the
fluid may look like it is brand new, with 100K on the fluid, I can assure you
that even if those miles were all highway at steady speed and no load that the
fluid has deteriorated and no longer lubricating the internal parts properly and
that there is some debris in the ******.If codes return and shifting problems
are still present, there is definite internal failure, possibly the pump or in
the clutches.
DTC P0733The powertrain control module (PCM) uses
the crankshaft position (CKP) sensor, input speed sensor (ISS) and output speed
sensor (OSS) to determine engine speed, input shaft speed and output shaft
speed. These sensor readings are used to determine the current gear ratio and
RPM slip across the torque converter. The PCM uses this information from the
sensors to determine if the commanded gear matches the actual gear. During
normal driving conditions, the PCM will adapt main line pressure via the
pressure control (PC) solenoid to prevent slipping and harsh shifts. Shift
solenoid 3 is used to apply or release third gear clutch. The PCM controls 3rd
gear by controlling the ground for shift solenoid 3. The PCM will turn the
solenoid OFF, open the driver circuit, when 3rd gear is commanded On to apply
3rd clutch. Shift solenoid 3 is supplied ignition voltage from the fuel pump
relay whenever the PCM commands the fuel pump relay ON. DTC P0733 sets when 3rd
clutch still slips after the PCM has commanded high main line pressure.DTC
Parameters
DTC P0733 will set if the PCM detects an incorrect
actual 3rd gear ratio when 3rd gear is commanded On when:- The condition exists
for longer than 3 seconds (2001)*- The condition exists for longer than 3
seconds, 1 minute is allowed to elapse, then condition exists again for longer
than 3 seconds (2000)- The high main line pressure has been commanded- The
transaxle is in a forward gear- The input speed is greater than 224 RPM- The
vehicle speed is greater than 5 km/h (3 mph)- The speed noise parameter = NO-
The steady state ratio fail counter equals 255 for an in-gear failure, or the
shift fail counter is greater than 100 on a downshift or upshift to 3rd gear
(128=0 or normal operation)DTC P0733 diagnostic runs continuously once the above
conditions have been met.
DTC P0733 is a type A DTC for 2000,
type B for 2001.**Applicable to vehicles built after June 2000.
Diagnostic AidsImportant: If DTCs P0745, P0746, P0756, P0758,
P0761, P0763, P0766, P0768 or P0789 is set, diagnose that DTC first. A diagnosed
PC solenoid, shift solenoid 2, 3 or 4 low/high circuit fault DTC may have caused
DTC P0733 to set.Important: If a shift solenoid performance DTC P0783, 4th gear
stuck ON, is set, diagnose that DTC first. A 4th gear stuck ON may cause no 3rd
gear, no 2nd gear, or TCC stuck Off.
Refer to Pressure Ports -
Air Check and Parts Description for pressure apply points and for
component/location description.
Possible causes of no 3rd gear
are listed in the flowchart on the succeeding page.
Verify
TRANSMISSION ISS and TRANSMISSION OSS read correctly on Scan tool.
Make sure the pressure control, shift 2, shift 3 and shift 4
solenoids are not intermittently sticking. A sticking shift solenoid 4 may cause
4th gear to be applied from an initial start resulting in no 3rd gear. Audible
sound should be similar for all solenoids. A muffled tone indicates the need for
replacement.
Check this pinout
HEREP0734 refer at ratio 4
gear, and the rocedure is the same.
Hope helps.
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