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Diagnosis - 4L60-E: Overhaul Chevrolet Suburban C2500

Automatic Trans 2 illustrations

PRESSURE SWITCH ASSEMBLY

Install Jumper Harness (J39775) to transmission 20-pin connector. Compare resistance of pressure switches with gear selector in each position to known values. (Scheme 344) If resistance values are the same as chart, problem is intermittent. If resistance values are not the same, complete chart until problem is found.

ComponentOhms
Pressure Control Solenoid3-7
TCC Solenoid21-33
TCC PWM & 3-2 Control Solenoid10-15
1-2 & 2-3 Shift Solenoids19-31
TFT Sensor
At 68°F (20°C)3088-3942
At 212°F (100°C)159-198
Vehicle Speed Sensor
At 68°F (20°C)1150-1250
At 212°F (100°C)1725-1825

TRANSMISSION COMPONENT RESISTANCE SPECIFICATIONS

Identifying Component & Connector Terminal Locations Courtesy of General Motors Corp. Scheme 343

Scheme 343: Identifying Component & Connector Terminal Locations Courtesy of General Motors Corp.
Scheme 343: Identifying Component & Connector Terminal Locations Courtesy of General Motors Corp.

Pressure Switch Assembly Resistance Chart Courtesy of General Motors Corp. Scheme 344

Scheme 344: Pressure Switch Assembly Resistance Chart Courtesy of General Motors Corp.
Scheme 344: Pressure Switch Assembly Resistance Chart Courtesy of General Motors Corp.

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