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Home >> Suzuki >> 1995 >> Sidekick JS, 2D Utility, Automatic, 03-73LE >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Diagnosis - Aw03-72LE >> Symptom Trouble Shooting >> No Upshift To Overdrive
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No Upshift To Overdrive

  1. Ensure engine and transmission are at normal operating temperature. Retrieve trouble codes. See RETRIEVING TROUBLE CODES . If a trouble code is present, repair as needed. Clear trouble codes. See CLEARING TROUBLE CODES . If no trouble codes are present, go to next step.
  2. Perform manual shifting test. See MANUAL SHIFTING TEST  under TRANSMISSION SHIFT TESTING. Reconnect TCM harness connector. Raise and support vehicle. Using a DVOM, measure voltage (backprobe) between chassis ground and TCM harness connector terminal S1, then terminal S2 while operating vehicle through all gears with shift selector in "D" position. See Figure. Record readings and compare with table. See SHIFT SOLENOID VOLTAGE  table. Go to next step.
    SHIFT SOLENOID VOLTAGE

    Application: 1st Gear 2nd Gear 3rd Gear OD Gear
    No. 1 Shift Solenoid 10-14 Volts 10-14 Volts 0 Volt 0 Volt
    No. 2 Shift Solenoid 0 Volt 10-14 Volts 10-14 Volts 0 Volt
  3. If any reading is not within specification, go to next step. If all readings are within specification, inspect shift solenoids. See SHIFT SOLENOIDS under COMPONENT TESTING . If shift solenoids are okay, inspect and repair circuits between TCM and shift solenoids as needed. If circuits are okay, replace TCM and retest.
  4. Repeat vehicle operation through all gears while monitoring voltage between chassis ground and TCM harness connector terminal "L", then terminal "2". If reading is zero volts for both circuits, go to next step. If reading is not as specified, replace Park/Neutral Position (PNP) switch and retest.
  5. Measure voltage (backprobe) between chassis ground and TCM harness connector terminal OD. See Figure. If reading is 5 volts with OD switch in OFF position, and zero volts in ON position, go to next step. If reading is not as specified, inspect OD switch and applicable circuits. See wiring diagram in WIRING DIAGRAM . Repair as needed.
  6. Measure voltage (backprobe) between chassis ground and TCM harness connector terminal WT. See Figure. If reading is zero volts with engine coolant temperature below 77°F (25°C), and battery voltage with engine coolant temperature above 86°F (30°C), go to step 8). If reading is not as specified, go to next step.
  7. Inspect ECT sensor. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. Repair or replace sensor as needed. If sensor is okay, go to next step.
  8. Measure voltage (backprobe) between chassis ground and TCM harness connector terminal L4. If reading is zero volts with transfer case in 4WD position, and battery voltage in 2WD position, replace TCM and retest. If reading is not as specified, replace 4WD switch (located on side of transfer case).
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