Improper Ratio

Symptom:
IMPROPER RATIO

When Monitored: Engine RPM greater than 450 RPM, output speed greater than 180 RPM, no N2 - N3 input speed sensor errors present, no gear selector lever errors present, no ABS system errors, and all wheel speeds above 450 RPM.

Set Condition: No shifting operation and detected gear is not the actual gear No shifting operation - detected (calculated) gear is less than actual (expected) gear or no plausible gear is calculated or Actual turbine speed -calculated turbine speed > 300 RPM or calculated transmission ratio is above threshold. During an Upshift -detected (calculated) gear is less than actual (expected) gear-1. During Downshift - detected (calculated) gear is less than actual (expected) gear

Test 1:

Test 2:

POSSIBLE CAUSES
- TRANSMISSION MECHANICAL PROBLEM
- TCM - IMPROPER RATIO