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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 66 (Automatic Transmission Diagnosis - 4L80-E (Gasoline)) >> Diagnostic Tests >> DTC P0730: Incorrect Gear Ratio >> Circuit Description

Circuit Description

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The PCM calculates the gear ratio based on the transmission Input Speed Sensor (ISS) and Output Speed Sensor (OSS) readings. The PCM compares the known transmission gear ratio to the calculated ratio for the selected gear ranges.

If the PCM detects an unknown transmission gear ratio, then DTC P0730 sets. DTC P0730 is a type "C" DTC.

GEAR RATIO SPECIFICATIONS

Gear Range Gear Ratio
1st 2.42-2.50
2nd 1.44-1.50
3rd 0.25-1.03
Reverse 2.04-2.12
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