LEMON Manuals: Even more car manuals for everyone
Home >> Saturn >> 1997 >> SW2 Automatic >> Repair and Diagnosis (Single Page) >> Transmission >> Automatic Trans >> Diagnosis - Mp6 & Mp7 >> Diagnostic Testing >> DTC P0734: No 4TH Gear >> Diagnostic Procedure

Diagnostic Procedure

  1. Determine if DTC's P0705, P0706, P0708, P0745, P0746, P0749, P0766, P0768 or P0769 are present. These flags must be eliminated first as a possible cause for DTC P0734.
  2. Check actuator operation. See ACTUATOR QUICK CHECK  under SELF-DIAGNOSTIC SYSTEM. Operation sound of all actuators should be similar.
  3. Check pressure regulator valve operation. See HYDRAULIC PRESSURE TESTS If line pressure does not change or changes slightly, regulator valve is stuck. Repair as needed.
  4. Air check 4th clutch operation. See TRANSMISSION SERVICING - A/T article in AUTOMATIC TRANS SERVICE section. Repair as needed. If clutch air checks okay, disassembly of transaxle will be necessary to inspect internal components.
  5. Cross-channel leaks may cause other clutches to be applied. If PCM detects other gears are stuck on, other DTC's will be present. This may help locate cross-channel leak.
  6. If clutch applies and releases, check valve body for damage. If clutch does not operate, check for failed clutch plates.
scientia non olet · About LEMON Manuals