Component Testing
WARNING: This page is about a different car, the 2010 GMC Sierra, 2010 GMC Cab & Chassis Sierra, 2010 Chevrolet Silverado, and 2010 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
1. TCSCS - Mode Switch Circuit
- Key OFF. Remove the TCSCS.
- Using the L-BU probe J 35616-65, measure the resistance for each of the mode positions of the TCSCS between the 5-volt reference circuit, TCSCS X1 pin 11, and the switch signal circuit TCSCS X1 pin 12.
- If the resistance is outside the specified ranges, replace the TCSCS.
- Test the TCCM for proper operation.
| Mode | Range | Nominal |
|---|---|---|
| 2 Hi | 1475-1550 Ω | 1515 Ω |
| 4 Hi | 625-700 Ω | 665 Ω |
| 4 Low | 2300-2400 Ω | 2345 Ω |
| Neutral | 1000-1050 Ω | 1020 Ω |
2. TCCM - Mode Switch Circuit
- Key ON, engine OFF. Install the TCSCS.
- Using the Data Display feature of the scan tool, monitor the Mode Switch Supply and Return Voltages while turning the TCSCS through each mode.
- If the voltage is less than the specified value, test the affected circuit for an open/high resistance, short to ground or short together. If all circuits and connections test normal, reprogram the TCCM. If the DTC resets replace the TCCM.
- If the voltage is greater than the specified value, test the affected circuit for a short to voltage. If all circuits and connections test normal, reprogram the TCCM. If the DTC resets replace the TCCM.
- Perform the circuit/system testing.
| Mode | Mode Switch Supply Voltage | Mode Switch Return Voltage | Rotational Position Sensor | |
|---|---|---|---|---|
| Range | Nominal | |||
| 2 Hi | 4.9-5.0 V | 1.80-2.18 V | 1.97 V | 37° |
| 4 Hi | 4.9-5.0 V | 2.78-3.22 V | 3.00 V | 124° |
| 4 Low | 4.9-5.0 V | 1.33-1.67 V | 1.50 V | -76° |
| Neutral | 4.9-5.0 V | 2.27-2.68 V | 2.47 V | 0° |