The TCCM has two startup strategies that affect IWE operation after initial key cycle:
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- When ambient temperature is below 32 F (0 C), the IWE engage after initial key cycle and a driven gear is selected. The hubs stay engaged regardless of a 4x4 mode change for approximately 2 miles (3km). Once the set distance has been achieved, the IWE disengage (if the vehicle is in 2WD (2H)). Distance traveled resets only if the temperature is below calibrated threshold and another key cycle occurs or if customer shifts to Park (P) and back to a driven gear within the same key cycle. The TCCM uses this strategy to warm up the front axle in cold temperatures to improve driveline synchronization.
- When ambient temperature is above 32 F (0 C), the IWE engage after the initial key cycle and a driven gear is selected. The hubs stay engaged regardless of a 4x4 mode change for approximately 0.5 miles (0.8km). Engagement only occurs once per key cycle and is not reset when shifting between Park (P) and Drive (D). The TCCM uses this strategy to delay vacuum use until vacuum-intensive engine startup has completed and sufficient vacuum is available to fully disengage the IWE.