To enter the cheat codes, pause the game and go to the "Cheats" option. Note that mission cheats are unlocked after playing a mission. Moreover, you cannot save the game while a cheat code is being used.
Blue suit: BLUE
Blue suit with shades: BLUESH
Grey suit: GRAY
Grey suit with shades: GRAYSH
Full health: MEDIK
Full ammunition: AMMO
Increase cop heat: DONUT
1,000 Balls: FPATCH
Repair vehicle: TBURGLR
Decrease cop heat: FLYSTRT
Sandy shirt: SANDY
Sandy shirt with shades: SANDYSH
White suit: WHITE
White suit with shades: WHITESH
Decrease gang heat: NOBALLS
Black suit: BLACK
Increase gang heat: GOBALLS
Ariel MK III: OLDFAST
Bacinari: 666999
Bulldozer: DOZER
Dumptruck: DUMPER
Bodog Stampede: BUMMER
"The World Is Yours" song by Breal: TUNEME
Hawaiian shirt: HAWAII
Hawaiian shirt with shades: HAWAIIG
Change time of day: MARTHA
Lightning: SHAZAM
Rain: RAINY