Pinpoint Test K: DTC P1820, P1822, P1828 or P1830

Pinpoint Test K: DTC P1820, P1822, P1828 or P1830

Normal Operation

When the low to high shift occurs, circuit 782 (BR/WH) provides the 4x4 module-switched ground path for the clockwise rotation relay. While the low to high (clockwise) relay is energized, circuit 777 (YE) sends battery voltage from the central junction box (CJB) fuse 111 (30A) and circuit 704 (DG/LG). Circuit 778 (OG) provides ground for the transfer case shift motor to operate in the clockwise direction. When the high to low shift occurs, circuit 781 (OG/LB) provides the 4x4 module-switched ground path for the counterclockwise rotation relay. While the high to low counterclockwise relay is energized, circuit 778 (OG) sends battery voltage from the CJB fuse 111 (30A) and circuit 704 (DG/LG). Circuit 777 (Y) provides ground for the transfer case shift motor to operate in the counterclockwise direction.






Possible Causes
- Central junction box fuse 111 (30A)
- Circuits:
- 704 (DG/LG)
- 57a (BK)
- 777 (YE)
- 778 (OG)
- 781 (OG/LB)
- 782 (BN/WH)
- Low to high relay
- High to low relay