They added some in the newer manuals, like code 25 which still seems to happen on the older twins, so here are the most recent codes that i know of:

21 Loss of Synchronization
22 TPS Circuit: Open and Short To Ground
22 TPS Circuit: Short To Battery
23 RAM Error: Defective ECU
25 Transmission Input - Invalid Gear
26 Vehicle Speed Sensor - Implausible
41 Air Temp Sensor: Open or Short Circuit to Sensor Voltage (ECU)
41 Air Temp Sensor: Short Circuit to Ground
42 Engine Temperature Sensor Circuit: Short To Ground
42 Engine Temperature Sensor Circuit: Open or Short to Battery
45 Barometric Pressure Sensor: Circuit Low Input
46 Barometric Pressure Sensor: Circuit High Input
51 Injector 1: Open Load
51 Injector 1: Short Circuit to Ground
51 Injector 1: Short Circuit to Battery
52 Injector 2: Open Load
52 Injector 2: Short Circuit to Ground
52 Injector 2: Short Circuit to Battery
54 Engine Temperature Lamp: Open Load
54 Engine Temperature Lamp: Short Circuit to Ground
54 Engine Temperature Lamp: Short Circuit to Battery
55 Diagnostic Lamp: Open Load
55 Diagnostic Lamp: Short Circuit to Ground
55 Diagnostic Lamp: Short Circuit To Battery
56 Pump Relay Open Load
56 Pump Relay Short Circuit to Ground
56 Pump Relay Short Circuit to Battery
58 Cooling Fan: Open Load
58 Cooling Fan: Short Circuit to Ground
58 Cooling Fan: Short Circuit to Battery
61 End of Diagnostic