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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 220 (Automatic Transaxle Diagnosis - 4T65-E) >> Diagnostic Tests >> DTC P0730: Incorrect Gear Ratio >> Circuit Description

Circuit Description

WARNING: This page is about a different car, the 2003 Buick Regal and 2003 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.

The PCM calculates the gear ratio based on data from the Input Shaft Speed (ISS) sensor and the Vehicle Speed Sensor (VSS). The PCM compares the known transaxle gear ratio to a calculated ratio for each gear range selected. The VSS output is translated to RPM and MPH by the PCM for various uses.

If the PCM detects an incorrect gear ratio because of excessive slip within the transaxle, then DTC P0730 sets. DTC P0730 is a type "C" DTC.

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