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Home >> Ford >> 1990 >> Bronco II 4WD, Automatic >> Repair and Diagnosis >> Transmission >> Transfer Case >> Diagnosis & Overhaul - Borg-WARNER 1350 & 1356 >> Testing >> Electronic Shift Transfer Case >> Shift Motor Chatters, But Will Not Shift

Shift Motor Chatters, But Will Not Shift

During a shift from 2H to 4H, motor chatters or clicks but does not shift. Motor may hunt to find 4H and overshoot, then hunt back and overshoot again. After 7-10 seconds, module returns shift motor to 2H (default). If shift motor is running too fast or braking too slowly for proper positioning, it must be replaced.

SHIFT MOTOR POSITION

Motor Position Dash & Switch Lights Mech Position B7 (1) B6 (1) B5 (1) (1) B4
2H No 2H Open Closed Open Closed
Edge 1 No 2H Closed Closed Open Closed
2H-4H No 2H Closed Open Open Closed
Edge 2 (2) No 4H Closed Closed Open Closed
4H 4H On 4H Closed Closed Open Open
Edge 3 (3) 4H On 4H Closed Closed - Closed Open
4H-4L 4H On Neutral Open Closed Closed Open
Edge 4 (3) 4H On 4L Open Closed Closed Closed
4L 4H & 4L On 4L Open Open Closed Closed
(1) Three or more open readings in any position indicates a fault with motor and sensor assembly.
(2) In Edge 2, pressing 4H switch moves to 4H position and light comes on.
(3) If motor is in Edge 3, 4H-4L or Edge 4 at start up, control module will attempt shift to 4H. 4H shift requires that vehicle is stopped, clutched depressed or A/T in Neutral. Until these conditions are met and shift is completed, pushing buttons will not do anything.
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