2. TCCM - Mode Switch Circuit
WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 GMC Cab & Chassis Sierra, 2009 Chevrolet Silverado, and 2009 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
- If the resistance is outside the specified ranges, replace the TCSCS.
- Key ON. Engine OFF.
- Using the Data Display feature of the scan tool, monitor the Mode Switch Supply and Return Voltages for the following modes:
- Perform the circuit/system testing.
| Mode | Mode Switch Supply Voltage | Mode Switch Return Voltage | |
|---|---|---|---|
| Range | Nominal | ||
| 2 Hi | 4.9-5.0 V | 1.95-2.00 V | 1.97 V |
| 4 Hi | 4.9-5.0 V | 2.75-3.05 V | 2.95 V |
| 4 Low | 4.9-5.0 V | 1.40-1.55 V | 1.47 V |
| Neutral | 4.9-5.0 V | 2.40-2.55 V | 2.47 V |
- 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.