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Home >> Isuzu >> 1993 >> Rodeo LS, 4WD, Automatic >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Overhaul - 4L30-E >> Performance Tests >> Road Test

Road Test

  1. Before performing road test, check fluid level, fluid condition and shift linkage adjustment. Check for stored diagnostic trouble codes. See HYDRA-MATIC 4L30-E DIAGNOSIS article.
    2. NOTE: On 1994 models, if road test is performed with engine coolant temperature less than 158°F (70°C), shift speeds will be delayed during light throttle application and occur at a slightly higher speed.
  2. If stored diagnostic trouble code exists, clear diagnostic trouble codes from TCM memory. See HYDRA-MATIC 4L30-E DIAGNOSIS article.
    3. NOTE: On 1994 models, if TECH 1 scan tool is connected to TCM/EC data link connector, maximum line pressure will be obtained, resulting in harsh shifts.
  3. Start and warm engine to normal operating temperature. Road test vehicle and check for abnormal noise and clutch slippage and shift firmness. Specified clutch and brake are applied in designated gear. See CLUTCH & BAND APPLICATION  table under TROUBLE SHOOTING.
  4. Ensure upshift and downshift speeds are correct in relation to throttle opening and position of power or winter mode switches mounted on center console, near shift lever. See appropriate table in SHIFT SPEED SPECIFICATIONS  .
    5. NOTE: Engine coolant temperature must be greater than 158°F (70°C) for TCC operation. The TCC operates in 2nd gear kickdown when engine coolant temperature is greater than 158°F (70°C). The TCC operates in 2nd, 3rd and 4th gear when transmission fluid temperature is greater than 284°F (140°C).
  5. Ensure Torque Converter Clutch (TCC) operation is correct to gear application in relation to throttle opening with shift lever in "D" position. See TORQUE CONVERTER CLUTCH SPECIFICATIONS  table.
  6. During road test if CHECK TRANS light on instrument panel starts flashing, a diagnostic trouble code is stored in the TCM memory. Check stored diagnostic trouble code and repair as necessary.
  7. During road test, if problem exists, but CHECK TRANS light on instrument panel did not flash, shut engine off. Disconnect electrical connectors at TCM, mounted below driver's side of instrument panel. See Figure .
  8. Repeat road test, while manually shifting the transmission. With shift lever in "L" position, transmission should remain in 1st gear. With shift lever in "2" position, transmission should remain in 3rd gear. With shift lever in "3" or "D" position, transmission should remain in 4th gear. Shut engine off. Reinstall electrical connectors on TCM.
  9. If problem still exists, see SYMPTOM DIAGNOSIS  under TROUBLE SHOOTING. If problem does not exist with electrical connectors disconnected at TCM, check wiring connections and TCM ground circuits.
TORQUE CONVERTER CLUTCH SPECIFICATIONS (1)

Application Gear MPH
1993 Rodeo
TCC ON
Normal Mode 4th Gear 42-46
Power Mode 4th Gear 51-55
TCC OFF
Normal Mode 4th Gear 39-43
Power Mode 4th Gear 48-52
1993 Trooper
TCC ON
Normal Mode 4th Gear 39-43
Power Mode 4th Gear 48-52
TCC OFF
Normal Mode 4th Gear 36-40
Power Mode 4th Gear 45-49
1994 Passport & Rodeo
TCC ON
Normal Mode 2nd Gear 47-50
Normal Mode 3rd Gear 34-38
Normal Mode 4th Gear 40-45
Power Mode 2nd Gear 47-50
Power Mode 3rd Gear 50-53
Power Mode 4th Gear 50-53
TCC OFF
Normal Mode 2nd Gear 43-47
Normal Mode 3rd Gear 29-33
Normal Mode 4th Gear 37-41
Power Mode 2nd Gear 43-47
Power Mode 3rd Gear 44-48
Power Mode 4th Gear 47-50
1994 Trooper
TCC ON
Normal Mode 2nd Gear 45-48
Normal Mode 3rd Gear 33-37
Normal Mode 4th Gear 39-43
Power Mode 2nd Gear 45-49
Power Mode 3rd Gear 48-52
Power Mode 4th Gear 48-52
TCC OFF
Normal Mode 2nd Gear 42-45
Normal Mode 3rd Gear 28-32
Normal Mode 4th Gear 36-40
Power Mode 2nd Gear 42-45
Power Mode 3rd Gear 42-46
Power Mode 4th Gear 45-48
(1) Specification listed with throttle opening of 9 percent and shift lever in "D" position.
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