Signal specification
General
All values listed below are measured between the respective terminal in column 2 (control module terminal) and terminal J2 19 (ground) unless otherwise stated in column 6 (other).
NOTE:
It is important to connect the breakout box, check the power supply and check the ground terminals before taking readings.
| U= | DC voltage in volts (V) | Ubat = | Battery voltage in volts (V) |
| I = | Current in amperes (A) | Ulow = | Voltage approximately 0 V |
| f = | Frequency in Hertz (Hz) | %duty = | Duty cycle (pulse ratio) as a percentage |
Connectors #J1/1 - #J1/32
| Breakout box terminal | Control module terminal | Signal type | Ignition on | Engine idling | Other |
| #A1 | #J1/01 | Control module power supply, LPG (30 supply) | U=Ubat | U=Ubat | Ignition off U=Ubat (externally connected to #J2/32) |
| #A2 | #J1/02 | Control module power supply, LPG (15 supply) | U=Ubat | U=Ubat | Ignition off U=Ulow |
| #A3 | #J1/03 | Signal ground, throttle position (TP) sensor | U=Ulow | U=Ulow | - |
| #A4 | #J1/04 | Signal, fuel (gas) level in tank from combined instrument panel | - | U = Ulow /Ubat | U=Ulow
: Low gas level in the fuel tank U=Ubat : Gas level in the fuel tank OK |
| #A5 | #J1/05 | Signal, fuel (gas) shut-off from the engine control module (ECM) | - | U=Ulow / | U=Ulow
: Fuel shut-off system not active U=+5 V: Fuel shut-off system active |
| #A6 | #J1/06 | Control system from the gasoline / gas switch | U = Ulow /Ubat | U = Ulow /Ubat | U=Ulow : Gasoline power selected U=Ubat : Gas power selected |
| #A7 | #J1/07 | Not connected | - | - | - |
| #A8 | #J1/08 | Not connected | - | - | - |
| #A9 | #J1/09 | Not connected | - | - | - |
| #A10 | #J1/10 | Control signal to the fuel shut-off valve | - | U = Ulow /Ubat | U=Ulow
: No fuel shut-off (valve open) U=Ubat : Fuel shut-off (valve closed) |
| #A11 | #J1/11 | Not connected | - | - | - |
| #A12 | #J1/12 | Signal to the engine control module (ECM) about which fuel system is active (gas / gasoline) | U=4.6 V | U=Ulow /+5 V | U=Ulow
: Gas power activated U=+5 V: Gasoline power activated |
| #A13 | #J1/13 | Not connected | - | - | - |
| #A14 | #J1/14 | Not connected | - | - | - |
| #A15 | #J1/15 | Not connected | - | - | - |
| #A16 | #J1/16 | Not connected | - | - | - |
| #A17 | #J1/17 | Not connected | - | - | - |
| #A18 | #J1/18 | Not connected | - | - | - |
| #A19 | #J1/19 | Not connected | - | - | - |
| #A20 | #J1/20 | CENT signal, engine coolant temperature (ECT) signal from the engine control module (ECM) | U = Pulsed signal between Ulow
/+5 V f=45 Hz at +25°C f=20 Hz at +100°C |
pulsed signal with variable frequency and fixed pulse ratio (% duty). f increases as temperature falls | |
| #A21 | #J1/21 | Not connected | - | - | - |
| #A22 | #J1/22 | Not connected | - | - | - |
| #A23 | #J1/23 | Not connected | - | - | - |
| #A24 | #J1/24 | Not connected | - | - | - |
| #A25 | #J1/25 | Not connected | - | - | - |
| #A26 | #J1/26 | Control signal, LPG system relay | - | U = Ulow /Ubat | U=Ulow
: LPG system relay activated U=Ubat : LPG system relay not activated |
| #A27 | #J1/27 | Not connected | - | - | - |
| #A28 | #J1/28 | RPM signal, engine speed signal | - | U = Pulsed signal between Ulow
/+5 V f = 25 Hz (actual RPM /30) |
Pulsed signal with variable frequency and fixed pulse ratio (% duty) |
| #A29 | #J1/29 | Control signal, LPG indicator lamp in the combined instrument panel | - | U = Ulow /Ubat | U=Ulow
: LPG lamp activated U=Ubat : LPG lamp not activated |
| #A30 | #J1/30 | Not connected | - | - | - |
| #A31 | #J1/31 | Diagnostic lead C-link | U = 90 % of Ubat | - | Other values apply if a generic fault-tracing instrument is used |
| #A32 | #J1/32 | Not connected | - | - | - |
Connectors #J2/1 - #J2/32
| Breakout box terminal | Control module terminal | Signal type | Ignition on | Engine idling | Other |
| #B1 | #J2/01 | Not connected | - | - | - |
| #B2 | #J2/02 | Control signal to the stepper motor for the fuel distributor | - | During gas operation: U = Pulsed signal between Ulow /12 V |
When the stepper motor is activated, a PWM signal is transmitted on the motor windings. The appearance of the PWM signal changes, depending on the number of steps, and the direction in which the stepper motor is to be moved. |
| #B3 | #J2/03 | Control signal to the stepper motor for the fuel distributor | - | During gas operation: U = Pulsed signal between Ulow /12 V |
When the stepper motor is activated, a PWM signal is transmitted on the motor windings. The appearance of the PWM signal changes, depending on the number of steps, and the direction in which the stepper motor is to be moved. |
| #B4 | #J2/04 | Control signal to the stepper motor for the fuel distributor | - | During gas operation: U = Pulsed signal between Ulow /12 V |
When the stepper motor is activated, a PWM signal is transmitted on the motor windings. The appearance of the PWM signal changes, depending on the number of steps, and the direction in which the stepper motor is to be moved. |
| #B5 | #J2/05 | Control signal to the stepper motor for the fuel distributor | - | During gas operation: U = Pulsed signal between Ulow /12 V |
When the stepper motor is activated, a PWM signal is transmitted on the motor windings. The appearance of the PWM signal changes, depending on the number of steps, and the direction in which the stepper motor is to be moved. |
| #B6 | #J2/06 | Not connected | - | - | - |
| #B7 | #J2/07 | Not connected | - | - | - |
| #B8 | #J2/08 | Not connected | - | - | - |
| #B9 | #J2/09 | Not connected | - | - | - |
| #B10 | #J2/10 | Not connected | - | - | - |
| #B11 | #J2/11 | Not connected | - | - | - |
| #B12 | #J2/12 | Not connected | - | - | - |
| #B13 | #J2/13 | Not connected | - | - | - |
| #B14 | #J2/14 | Not connected | - | - | |
| #B15 | #J2/15 | Not connected | - | - | - |
| #B16 | #J2/16 | Not connected | - | - | - |
| #B17 | #J2/17 | Signal ground, manifold absolute pressure (MAP) sensor | U=Ulow | U=Ulow | - |
| #B18 | #J2/18 | Signal ground, front heated oxygen sensor (HO2S) | U=Ulow | U=Ulow | (externally connected to #J2/29) |
| #B19 | #J2/19 | Power ground | U=Ulow | U=Ulow | Ground terminal |
| #B20 | #J2/20 | Power ground | U=Ulow | U=Ulow | Ground terminal |
| #B21 | #J2/21 | Not connected | - | - | |
| #B22 | #J2/22 | Not connected | - | - | - |
| #B23 | #J2/23 | Not connected | - | - | - |
| #B24 | #J2/24 | Signal, throttle position (TP) sensor | U = 0.6-0.7 V with unaffected throttle position (TP) sensor | - | U = 0.6-4.5 V depending on the position of the accelerator pedal (AP) |
| #B25 | #J2/25 | Not connected | - | - | - |
| #B26 | #J2/26 | Power supply, manifold absolute pressure (MAP) sensor | U=+5 V | U=+5 V | - |
| #B27 | #J2/27 | Signal, front heated oxygen sensor (HO2S) | U=Ulow -1V | U oscillates between Ulow
-1 V when the probe is hot. Low voltage = lean High voltage = rich |
Measured to terminal #J2/29 |
| #B28 | #J2/28 | Not connected | - | - | - |
| #B29 | #J2/29 | Signal ground, front heated oxygen sensor (HO2S) | U=Ulow | U=Ulow | (externally connected to #J2/18) |
| #B30 | #J2/30 | Signal, manifold absolute pressure (MAP) sensor | U=3.6V | - | U reduces / increases with the pressure in the intake manifold |
| #B31 | #J2/31 | Not connected | - | - | - |
| #B32 | #J2/32 | Control module power supply, LPG (30 supply) | U=Ubat | U=Ubat | When the ignition is off, U=Ubat (externally connected to #J1/01) |