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Home >> Nissan-Datsun >> 2003 >> Sentra Limited >> Repair and Diagnosis >> External Pages >> Different car >> Section 59 (Automatic Transmission Diagnosis - Re4F03 Series) >> Performance Tests >> Stall Speed Test >> Torque Converter

Torque Converter

WARNING: This page is about a different car, the 2002 Nissan Sentra, 2002 Infiniti G20, 2001 Nissan Sentra, and 2001 Infiniti G20. However, it is still accessible from the selected car via links, so may be relevant.
  1. Check engine and transaxle fluid levels. Ensure engine and transaxle are at normal operating temperatures. Set parking brake and block wheels.
    2. CAUTION: DO NOT hold wide-open throttle for more than 5 seconds during test.
  2. Install tachometer so it is visible to driver. Start engine. Apply foot brake and move selector lever to "D" position. Gradually depress accelerator pedal to wide-open throttle position while applying foot brake. Note engine stall speed and release accelerator pedal immediately. Stall speed should be 2350-2800 RPM for 1.8L models, and 2350-2850 RPM for 2.0L models.
  3. Place selector lever in "N" position and run engine at idle for 2 minutes to allow transaxle to cool. Repeat stall speed test procedure in "2", "1" and "R" positions, allowing transaxle to cool between each test. Compare stall speed test results with the following symptoms:
    • If stall speed is low in all selector lever positions, possible cause is insufficient engine performance or faulty torque converter one-way clutch.
    • If stall speed is high in all selector lever positions, possible cause is low-reverse brake slipping, faulty forward one-way clutch, forward clutch, overrun clutch or hydraulic circuit for line pressure control.
    • If stall speed is high in "R" position only, possible cause is reverse clutch slipping or low-reverse brake slipping.
    • If stall speed is high in "D", "2" and "R" positions but okay in "1" position, possible cause is defective reverse clutch, forward clutch, forward clutch or low one-way clutch.
    • If stall speed is high in "D", "2" and "1" positions but okay in "R" position, possible cause is defective forward clutch, overrun clutch or forward one-way clutch.
    • If stall speed is high in "D" and "2" positions but okay in "1" & "R" positions, possible cause is defective forward clutch, low one-way clutch or overrun clutch.
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