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This site contains stuff about Volvo's famous B23/B230 turbo engine, the Bosch LH-2.4 Jetronic system and the Bosch EZ-116K ignition system.

Turbo+/LH 2.4.x/EZ-116K/ pinout and modifications

EZ-116K-Mod:

Let's have a look at a modification which can change the statical ignition timing on part load.

The EZ-116K has two so called 'selector pins' (pin 18 and 19). By grounding these pins you will be able to modify the statical ignition timing - this means, that you will get a modified timing on part load. At cranking and full load at higher rpm's the timing will switch back automatically to stock values. Also it's not possible to switch the timing just in time - this means, the timing must be set before cranking.

And here is this EZK-mod (choose one mode or make it switchable):

  • -6° retarded (connect pin 19 with pin 20)
  • -3° retarded (connect pin 18 with pin 20)
  •  0° default (nothing to do)
  • +3° advanced (connect pin 18+19 with pin 20)
If you want to know more about this mod you can read this article: Advance/retard timing on EZ116K on Turbobricks.com

Update: In the meantime I'm not longer sure if this mod makes any sense!
I have recognized the maps from every chipable EZK and have noticed that all switchable maps within one binary are identical, so the question is:
What exactly does this mod do for us? Any further information would be welcome to add it here.

OK, now we come to a mod which works indeed in the real world :)

It's possible to extend your EZK with a EPROM-Board. I have done this mod to a turbo EZK-148 and to a n/a EZK-175, both are acting in the same way after chipping (i have chipped them with the stock '219' eprom from the Goldbox and with my optimized EZK chip).
After that it's possible to use the chipped n/a-EZK at a B230 turbo engine.

If you want to know more about this mod you can read the following three articles and have a look below:

EZ116K Daughterboard GB
EZ116K Daughterboard prototype
EZ116K daughterboard assembly and installation guide



parts

soldered board

unsoldered ezk

board soldered

another view

chipped

Turbo+ KIT-Pinout:

1: Control Valve
2: LH system PIN28, EZK PIN4, knock-trigger, T+shutdown @ground
3: Control Valve, 12v supply
4: Ground connector
5: Throttle position switch/TP sensor, position 3 - full trottle
6: Ignition coil PIN 1, rev signal

EZK116K(LH2.4)-Pinout:

1: OBD diagnostic socket (in some markets: serial interface) : Transmits signals to diagnostic unit during fault trace
2: Receives analoque engine temperature signal from temp sensor
3: Check Engine Light output, shared with ECU pin 22. Signals: 12-off, 1-on
4: Knock enrichment, output to ECU pin 28, ~0.7V - ignition, ~7.5V @idle (stable), ground @knock
5: Receives power 12V direct from Battery
6: Receives power 12V from Battery across ignition switch terminal 15
7: Receives signal from throttle switch when trottle is closed
8: Receives engine load signal from air mass meter via fuel system control unit (Pin25)
9:
10: Receives engine speed and crankshaft position signal from engine speed sensor
11: Grounds engine speed sensor (shield)
12: Grounds knock sensor (shield)
13: Receives signals from knock sensor
14: EGR, Ground connector on engine (power ground)
15: EGR, converter, control
16: Transmits ignition pulses to power stage
17: Engine speed signal output, pulsed, 0.75V - ignition, 5.5-6.0V @cranking, =>7.5V @idle or higher rpm
18: Selector wire. Signals: 5v-disabled, grounded-enabled
19: Selector wire. Signals: 5v-disabled, grounded-enabled
20: Grounds control unit (signal ground)
21:
22: EGR, temperature sensor
23: Receives engine speed and crankshaft position signal from engine speed sensor
24:
25:

EZK117K(LH2.2)-Pinout:

1:
2:
3: Supplies fault indication signals to test terminal when test diode is connected
4: Supplies power to Hall generator in distributor
5:
6: Receives supply from battery across ignition switch
7: Grounded by throttle switch when throttle is closed
8: Receives load signal from fuel system control unit
9: Receives 12V supply when thermostat closes (B230FT only)
10: Grounds Hall generator in distributor (shield)
11:
12: Grounds knock sensor (shield)
13: Receives signal from knock sensor
14:
15: Transmits knock-controlled fuel enrichment signal to injection system control unit (B230FT only)
16: Transmits ignition pulses to power stage
17: Transmits speed signal to fuel system control unit
18:
19:
20: Grounds control unit
21:
22:
23:
24: Receives engine speed/crankshaft position signal from Hall generator in distributor
25:

Knock-Controlled fuel enrichment:

On receiving a signal from the knock sensor and having established that knock is present in all cylinders, the EZK-Unit connects a terminal on the fuel injection system unit to ground, causing the ECU to extend the injector opening period. This function is activated only within a certain speed and load range, in addition to which a certain average knock-controlled retardation must already bave been applied in all cylinders. The following conditions are required:

- EZ-116K: retardation of at least 3-4 degrees in all cyl. in response to knock detector signals at engine speeds above 3800rpm and above a certain min. load.
- EZ-117K: (B230FT only) 6 degrees in all cylinders in response to knock detector signals.


LH2.4-Pinout:

1: Engine speed signal input, pulsed, 0.75V - ignition, 5.5-6.0V @cranking, =>7.5V @idle or higher rpm
2: TPS signal input 0.2 - Idle speed, 4 - Full load
3: TPS signal secondary input 1.0 - Idling, 10 - Full load
4: Power supply +30 input 12
5: Signal Ground 0.0 - Separate from power ground
6: Mass air flow 0.0 - Separate from power ground
7: Mass air flow input 2.0V @Idling, 5.0V @Full Load
8: Mass air flow, burn-off Output 4.0 - At burn-off, 0 -otherwise
9: Power supply from main input 12
10: Low-speed pressure sensor, engine cooling fan
11: A/C Time-delay Relay, High-speed pressure sensor, engine cooling fan
12: Diagnostics lead I/O
13: Temp Sensor input 4V @-20C, 2.3V @+20C, 1.1V @+40C, 0.7V @+60C, 0.4V @+87C
14: A/C, ACC load Signal input 12-Auto, 0-ECON
15: Climate Unit, some others Jumper for cold start 0-no cold start, 12 cold start
16: Diagnostics Lead I/O
17: Chassis Ground
18: Injectors control signal Output 7.1Hz, 2.4-4.5ms
19: EGR Valve Output 12 - inactivated, <12 active
20: Fuel Pump relay signal 1-activ, 12-Ign on
21: Main relay operating circuit Output 1 - Ignition on, 12 - Ignition off
22: Check Engine Light Output 12-off, 1-on
23: EGR Temp Sensor input 4.5 -EGR closed, <4.5 -Open
24: Oxygen Sensor input 0.6 - 1.0 - Rich, 0.0 - 0.4 - Lean
25: Load Signal Tq EZK/DI Output Freq incr with throttle opening
26: Shift-Up light Output 12 - Not activated,0 - Activated
27: EVAP Canister purge valve Output 12 - Open, 1 - Closed
28: Knock enrichment (not B204FT), ~0.7V - ignition, ~7.5V @idle (stable), ground @knock
* Turbo+ Knock enrichment, trigger
* (B204FT/GT TCU) EGT sensor, trigger
29: Codification input 12 - Automatic transmission
30: Raising engine idle speed input 12-R,D,1,2,3, 0 - P,N, and manual
31: Consumption signal to EDU Output Freq incr with throttle opening
32: Cold start valve Output Battery voltage - Not activated
33: IAC valve Output 5-11 - Idling, no load
34: Speed Sensor input 6 -Rotating, 0 or 12 - Stationary
35: Power Supply +15 input 12-Ign on

LH2.2-Pinout:

1: Engine speed signal Input, Voltage, 6.5V @cranking, >8V @idle speed
2: Temperature sensor, 4V @-20C
3: TPS signal input, 0.0 - at idle speed, Above idle speed
4: Drive position(auto), Battery voltage - R,D,1,2,3 , P,N, and manual
5: Signal Ground, 0.0 - Separate from power
6: Mass air flow, ground, 0.0 - Separate from power ground
7: Mass air flow, 2.0V @Idling, 5.0V @Full Load
8: Mass air flow, burn-off, 4.0 - At burn-off, 0 - In other cases
9: Power supply from main input 12V
10: AIC Valve, 6 - 11 at idle
11: Grounding point, 0 - Separate from power ground
12: TPS wide open, 0V @wide open throttle, 5V @Idling
13: Control signal Output, 7.1 Hz, 2.4-4.5 ms
14: Mass air flow sensor, approx. 2
15: Grounding point for coding, 0
16: Raising engine idle speed, 12V for A/C engaged, 0V for A/C disengaged
17: Pump relay, approx. 1 - Activated, battery - ignition on
18: Main fuse box, positive Voltage, Battery voltage
19: CHECK ENGINE light, Battery voltage - out, 1 - on
20: Oxygen sensor - M1988, 0.6 - 1.0 - Rich, 0.0 - 0.4 - Lean, PRE-Ignition,
21: Main relay operating circuit Output, approx. 1 - Ignition on, Battery voltage - Ignition off
22: Oxygen sensor pulse ratio, data link connector
23: AIC valve, 6 to 12 - Idling
24: Load signal Output
25: Grounding point, 0 - Separate from signal ground

TCU-Pinout (B204FT/GT):

1: Turbo control valve (boost solenoid)
2:
3: OBD diagnostic socket
4: Relay, engine cooling fan, Control module ECC, ECU Pin 15
5: Relay, engine cooling fan
6: Blocking relay A/C
7: Throttle position (TP) switch/TP sensor
8: Throttle position (TP) switch/TP sensor
9: Temperature sensor TCU
10: Exhaust gas temperature sensor
11: High-speed pressure sensor, engine cooling fan
12: Low-speed pressure sensor, engine cooling fan
13: Combined instrument, speed sensor
14: Load Signal Tq, from ECU pin 25
15: 12v supply, constant
16:
17:
18:
19:
20: Ground connector on engine (signal ground)
21: Ground connector on engine (signal ground)
22:
23: 12v supply, switched
24: Throttle position (TP) switch/TP sensor, ground
25: Temperature sensor TCU, ground
26:
27:
28:
29:
30: PRE-IGNition, DI/APC Pin 4 input 0V Preignition, =7.5V stable, ground @knock
31:
32:
33:
34:
35: