Transfer Box Malfunction Indicator Lamp Request

Transfer Box Malfunction Indicator Lamp Request Description

This input indicates to the ECM that there is an OBD relevant error within the transfer box control module.
The ECM will illuminate the MIL and store the P1701 DTC whenever this signal is true.






The ECM carries out an integrity check on this signal following an 'ignition on' condition as shown and detects a fault if any of the following conditions are satisfied:
1. The line voltage is high during the low test.
2. The line voltage is low during the high test.
3. The line voltage is in an undefined state, neither high nor low.