Mode 21 information

Warning: This information might not be complete or correct. Use at your own risk.

Payload Byte	Bit	Information	Conversion	Range
01	1-8	Number of DTC’s		0-255
21	3	Fuel pump running		0-1
21	8	Speed > 0km/h		0-1
23	2	EGR on		0-1
23	3	Tank ventilation on		0-1
26	1	CEL on		0-1
32	1-8	Battery voltage	A/10	0-25.5V
33+34	1-16	Engine RPM	((A*256)+B)/4	0-16383rpm
37	1-8	Vehicle speed	A	0-255km/h
39	1-8	Engine coolant temperature sensor	A * 0.01953125	0-5V
40	1-8	Engine coolant temperature	A - 40	-40° - 215°C
41	1-8	Air intake temperature sensor	A * 0.01953125	0-5V
42	1-8	Air intake temperature	A - 40	-40° - 215°C
47	1-8	Manifold air pressure sensor	A * 0.01953125	0-5V
48	1-8	Manifold air pressure	A	0-255kPa
49	1-8	Accelerator pedal position sensor 1	A * 0.01953125	0-5V
50	1-8	Accelerator pedal position sensor 2	A * 0.01953125	0-5V
53	1-8	Throttle valve position sensor 1	A * 0.01953125	0-5V
54	1-8	Throttle valve position sensor 2	A * 0.01953125	0-5V
56	1-8	Throttle valve commanded position	A * 100/255	0-100%
58	1-8	EGR valve commanded position	A * 100/255	0-100%
59	1-8	EGR valve sensor	A * 0.01953125	0-5V
61	1-8	Tank ventilation commanded position	A * 100/255	0-100%
67	1-8	Ignition timing	A/2 - 64	-64° - 63.5°
83	1-8	Short term fueltrim	0.7812 * (A - 128)	-100 - 99.22%
85	1-8	O2 sensor 1	A * 0.005	0 - 1.275V
86	1-8	O2 sensor 2	A * 0.005	0 - 1.275V
89	1-8	Long term fueltrim	0.7812 * (A - 128)	-100 - 99.22%