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SAE J1979

Fuel parameters

The SAE J1979 standard has 36 fuel parameters.

How to read a parameter card

Alcohol fuel percentage ALCH_PCT

Indicates the percentage of alcohol contained in ethanol or methanol fuels, if used. For example, ethanol fuel (E85) normally contains 85% ethanol, in which case this parameter will display 85%

  • Request01 52
  • Service 01PID 52
  • Module7E0 → 7E8
  • Every1 s

Bits 0 to 7 of the reply, 8 bits.

Formula
(val × 100 ÷ 255)
Range
0 to 100 %
Unit
%
  1. The parameter's name and its ID in the OBDb. Confirmed shows when a response from a real car confirms the parameter.
  2. The clutch mark shows a Connectable, a parameter that Pelican surfaces in its interface.
  3. The service and PID/DID asked for, the control module it's sent to, and how often Pelican asks.
  4. The reply's bytes. The parameter's bytes are blue. Bytes for other parameters in the same reply are grayed out. Hover over a byte to see the parameter it represents.
  5. Where the parameter is in the response, and how Pelican converts the raw value into a value.
  6. A real reply, decoded. The raw value comes first, then the reading.
  7. Which model years have tested this parameter.

Alcohol fuel percentage ALCH_PCT

Indicates the percentage of alcohol contained in ethanol or methanol fuels, if used. For example, ethanol fuel (E85) normally contains 85% ethanol, in which case this parameter will display 85%

  • Request01 52
  • Service 01PID 52
  • Module7E0 → 7E8
  • Every1 s

Bits 0 to 7 of the reply, 8 bits.

Formula
(val × 100 ÷ 255)
Range
0 to 100 %
Unit
%

Commanded Fuel Rail Pressure A FRP_A_CMD

Displays commanded fuel rail pressure when the reading is referenced to atmosphere (gage pressure)

  • Request01 6D
  • Service 01PID 6D
  • Module7E0 → 7E8
  • Every250 ms

Bits 8 to 23 of the reply, 16 bits.

Formula
(val × 10)
Range
0 to 655350 kPa
Unit
kPa

Commanded Fuel Rail Pressure B FRP_B_CMD

Displays commanded fuel rail pressure when the reading is referenced to atmosphere (gage pressure)

  • Request01 6D
  • Service 01PID 6D
  • Module7E0 → 7E8
  • Every250 ms

Bits 48 to 63 of the reply, 16 bits.

Formula
(val × 10)
Range
0 to 655350 kPa
Unit
kPa

Engine exhaust flow rate EXH_RATE

  • Request01 9E
  • Service 01PID 9E
  • Module7E0 → 7E8
  • Every250 ms

Bits 0 to 15 of the reply, 16 bits.

Formula
(val ÷ 5)
Range
0 to 13107 kg/h
Unit
kg/h

Engine fuel rate FUEL_RATE

Measured in units per hour

Pelican can show this parameter as the fuel rate.

  • Request01 5E
  • Service 01PID 5E
  • Module7E0 → 7E8
  • Every250 ms

Bits 0 to 15 of the reply, 16 bits.

Formula
(val ÷ 20)
Range
0 to 3212.75 L/h
Unit
L/h

Engine fuel rate (alternate) FUEL_RATE_ALT

  • Request01 9D
  • Service 01PID 9D
  • Module7E0 → 7E8
  • Every250 ms

Bits 0 to 15 of the reply, 16 bits.

Formula
(val ÷ 50)
Range
0 to 1310.7 g/s
Unit
g/s

Fuel Rail Pressure A FRP_A

Displays fuel rail pressure when the reading is referenced to atmosphere (gage pressure).

  • Request01 6D
  • Service 01PID 6D
  • Module7E0 → 7E8
  • Every250 ms

Bits 24 to 39 of the reply, 16 bits.

Formula
(val × 10)
Range
0 to 655350 kPa
Unit
kPa

Fuel Rail Pressure B FRP_B

Displays fuel rail pressure when the reading is referenced to atmosphere (gage pressure).

  • Request01 6D
  • Service 01PID 6D
  • Module7E0 → 7E8
  • Every250 ms

Bits 64 to 79 of the reply, 16 bits.

Formula
(val × 10)
Range
0 to 655350 kPa
Unit
kPa

Fuel Rail Temperature A FRT_A

  • Request01 6D
  • Service 01PID 6D
  • Module7E0 → 7E8
  • Every250 ms

Bits 40 to 47 of the reply, 8 bits.

Formula
(val − 40)
Range
-40 to 215 °C
Unit
°C

Fuel Rail Temperature B FRT_B

  • Request01 6D
  • Service 01PID 6D
  • Module7E0 → 7E8
  • Every250 ms

Bits 80 to 87 of the reply, 8 bits.

Formula
(val − 40)
Range
-40 to 215 °C
Unit
°C

Fuel system 1 status FUELSYS1

  • Request01 03
  • Service 01PID 03
  • Module7E0 → 7E8
  • Every250 ms

Bits 0 to 7 of the reply, 8 bits.

Unit
Named states
States
Raw valueStateMeaning
0OFFEngine is off
1OLOpen loop - has not yet satisfied conditions to go closed loop
2CLClosed loop - using oxygen sensor(s) as feedback for fuel control
4OL-DriveOpen loop due to driving conditions (e.g. power enrichment, deceleration enleanment)
8OL-FaultOpen loop - due to detected system fault
16CL-FaultClosed loop, but fault with at least one oxygen sensor - may be using single oxygen sensor for fuel control
32OL B2Open loop - has not yet satisfied conditions to go closed loop (Bank 2)
64OL-Drive B2Open loop due to driving conditions (Bank 2) (e.g. power enrichment, deceleration enleanment, cylinder deactivation)
128OL-Fault B2Open loop - due to detected system fault (Bank 2)

Fuel system 2 status FUELSYS2

  • Request01 03
  • Service 01PID 03
  • Module7E0 → 7E8
  • Every250 ms

Bits 8 to 15 of the reply, 8 bits.

Unit
Named states
States
Raw valueStateMeaning
0OFFEngine is off
1OLOpen loop - has not yet satisfied conditions to go closed loop
2CLClosed loop - using oxygen sensor(s) as feedback for fuel control
4OL-DriveOpen loop due to driving conditions (e.g. power enrichment, deceleration enleanment)
8OL-FaultOpen loop - due to detected system fault
16CL-FaultClosed loop, but fault with at least one oxygen sensor - may be using single oxygen sensor for fuel control
32OL B2Open loop - has not yet satisfied conditions to go closed loop (Bank 2)
64OL-Drive B2Open loop due to driving conditions (Bank 2) (e.g. power enrichment, deceleration enleanment, cylinder deactivation)
128OL-Fault B2Open loop - due to detected system fault (Bank 2)

Fuel system A use percentage bank 1 FUELSYSA_B1

  • Request01 9F
  • Service 01PID 9F
  • Module7E0 → 7E8
  • Every250 ms

Bits 8 to 15 of the reply, 8 bits.

Formula
(val × 100 ÷ 255)
Range
0 to 100 %
Unit
%

Fuel system A use percentage bank 2 FUELSYSA_B2

  • Request01 9F
  • Service 01PID 9F
  • Module7E0 → 7E8
  • Every250 ms

Bits 24 to 31 of the reply, 8 bits.

Formula
(val × 100 ÷ 255)
Range
0 to 100 %
Unit
%

Fuel system A use percentage bank 3 FUELSYSA_B3

  • Request01 9F
  • Service 01PID 9F
  • Module7E0 → 7E8
  • Every250 ms

Bits 40 to 47 of the reply, 8 bits.

Formula
(val × 100 ÷ 255)
Range
0 to 100 %
Unit
%

Fuel system A use percentage bank 4 FUELSYSA_B4

  • Request01 9F
  • Service 01PID 9F
  • Module7E0 → 7E8
  • Every250 ms

Bits 56 to 63 of the reply, 8 bits.

Formula
(val × 100 ÷ 255)
Range
0 to 100 %
Unit
%

Fuel system B use percentage bank 1 FUELSYSB_B1

  • Request01 9F
  • Service 01PID 9F
  • Module7E0 → 7E8
  • Every250 ms

Bits 16 to 23 of the reply, 8 bits.

Formula
(val × 100 ÷ 255)
Range
0 to 100 %
Unit
%

Fuel system B use percentage bank 2 FUELSYSB_B2

  • Request01 9F
  • Service 01PID 9F
  • Module7E0 → 7E8
  • Every250 ms

Bits 32 to 39 of the reply, 8 bits.

Formula
(val × 100 ÷ 255)
Range
0 to 100 %
Unit
%

Fuel system B use percentage bank 3 FUELSYSB_B3

  • Request01 9F
  • Service 01PID 9F
  • Module7E0 → 7E8
  • Every250 ms

Bits 48 to 55 of the reply, 8 bits.

Formula
(val × 100 ÷ 255)
Range
0 to 100 %
Unit
%

Fuel system B use percentage bank 4 FUELSYSB_B4

  • Request01 9F
  • Service 01PID 9F
  • Module7E0 → 7E8
  • Every250 ms

Bits 64 to 71 of the reply, 8 bits.

Formula
(val × 100 ÷ 255)
Range
0 to 100 %
Unit
%

Fuel tank level FLI

Pelican can show this parameter as the fuel tank level.

  • Request01 2F
  • Service 01PID 2F
  • Module7E0 → 7E8
  • Every1 s

Bits 0 to 7 of the reply, 8 bits.

Formula
(val × 100 ÷ 255)
Range
0 to 100 %
Unit
%

Vehicle fuel rate VFUEL_RATE

  • Request01 9D
  • Service 01PID 9D
  • Module7E0 → 7E8
  • Every250 ms

Bits 16 to 31 of the reply, 16 bits.

Formula
(val ÷ 50)
Range
0 to 1310.7 g/s
Unit
g/s

Fuel › Internal

Commanded Fuel Rail Pressure A data supported? FRP_A_CMD_SUP

  • Request01 6D
  • Service 01PID 6D
  • Module7E0 → 7E8
  • Every250 ms

Bit 7 of the reply.

Formula
val
Range
0 to 1
Unit
No or yes

Commanded Fuel Rail Pressure B data supported? FRP_B_CMD_SUP

  • Request01 6D
  • Service 01PID 6D
  • Module7E0 → 7E8
  • Every250 ms

Bit 4 of the reply.

Formula
val
Range
0 to 1
Unit
No or yes

Fuel Rail Pressure A data supported? FRP_A_SUP

  • Request01 6D
  • Service 01PID 6D
  • Module7E0 → 7E8
  • Every250 ms

Bit 6 of the reply.

Formula
val
Range
0 to 1
Unit
No or yes

Fuel Rail Pressure B data supported? FRP_B_SUP

  • Request01 6D
  • Service 01PID 6D
  • Module7E0 → 7E8
  • Every250 ms

Bit 3 of the reply.

Formula
val
Range
0 to 1
Unit
No or yes

Fuel system A use percentage bank 1 supported FUELSYSA_B1_SUP

  • Request01 9F
  • Service 01PID 9F
  • Module7E0 → 7E8
  • Every250 ms

Bit 7 of the reply.

Formula
val
Range
0 to 1
Unit
No or yes

Fuel system A use percentage bank 2 supported FUELSYSA_B2_SUP

  • Request01 9F
  • Service 01PID 9F
  • Module7E0 → 7E8
  • Every250 ms

Bit 5 of the reply.

Formula
val
Range
0 to 1
Unit
No or yes

Fuel system A use percentage bank 3 supported FUELSYSA_B3_SUP

  • Request01 9F
  • Service 01PID 9F
  • Module7E0 → 7E8
  • Every250 ms

Bit 3 of the reply.

Formula
val
Range
0 to 1
Unit
No or yes

Fuel system A use percentage bank 4 supported FUELSYSA_B4_SUP

  • Request01 9F
  • Service 01PID 9F
  • Module7E0 → 7E8
  • Every250 ms

Bit 1 of the reply.

Formula
val
Range
0 to 1
Unit
No or yes

Fuel system B use percentage bank 1 supported FUELSYSB_B1_SUP

  • Request01 9F
  • Service 01PID 9F
  • Module7E0 → 7E8
  • Every250 ms

Bit 6 of the reply.

Formula
val
Range
0 to 1
Unit
No or yes

Fuel system B use percentage bank 2 supported FUELSYSB_B2_SUP

  • Request01 9F
  • Service 01PID 9F
  • Module7E0 → 7E8
  • Every250 ms

Bit 4 of the reply.

Formula
val
Range
0 to 1
Unit
No or yes

Fuel system B use percentage bank 3 supported FUELSYSB_B3_SUP

  • Request01 9F
  • Service 01PID 9F
  • Module7E0 → 7E8
  • Every250 ms

Bit 2 of the reply.

Formula
val
Range
0 to 1
Unit
No or yes

Fuel system B use percentage bank 4 supported FUELSYSB_B4_SUP

  • Request01 9F
  • Service 01PID 9F
  • Module7E0 → 7E8
  • Every250 ms

Bit 0 of the reply.

Formula
val
Range
0 to 1
Unit
No or yes

Fuel Temperature A data supported? FRT_A_SUP

  • Request01 6D
  • Service 01PID 6D
  • Module7E0 → 7E8
  • Every250 ms

Bit 5 of the reply.

Formula
val
Range
0 to 1
Unit
No or yes

Fuel Temperature B data supported? FRT_B_SUP

  • Request01 6D
  • Service 01PID 6D
  • Module7E0 → 7E8
  • Every250 ms

Bit 2 of the reply.

Formula
val
Range
0 to 1
Unit
No or yes

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