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1988
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S15/T15 4WD Jimmy L4-151 2.5L
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Repair and Diagnosis
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Transmission and Drivetrain
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Automatic Transmission/Transaxle
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Testing and Inspection
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Symptom Related Diagnostic Procedures
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3L30 (180/180C) Automatic Transmission
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Immediate Downshift After Full Throttle Upshift & Releasing Acc.
Immediate Downshift After Full Throttle Upshift & Releasing Acc.
1. Detent valve stuck in open position.
2. Detent cable stuck.
3. Clogged or leaking vacuum modulator line.