Gasoline Electronic Fuel Injection 1 Slide 1
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1 Home ZEEMS Previous zzzems Zenith Electronic Engine Management System ZEEMS Gasoline Electronic Fuel Injection 1 Slide 1
2 Everest EFI Engine speed ZEEMS Home Previous 2200 rpm high speed 1900 rpm 1-wand zzzems 1400 rpm Upholstery 900 rpm Idle Water pump rpm 1455 rpm Vacuum pump rpm 3400 rpm Water flow rate 4.5 GPM (Maximum) 5CP3120 Water pump pressure (low pressure) 1200 PSI (Maximum) Water pump pressure (high pressure) 3000 PSI (Maximum) 2 Slide 2
3 Home ZEEMS Previous zzzems Precise fuel control throughout all operating temperatures and conditions Virtually eliminates flat spots and engine run-on (dieseling) Achieves maximum power with lowest emissions 3 Slide 3
4 2 The ZEEMS Control system electrically controls the following: Fuel Delivery via fuel injector Engine RPM via throttle shaft actuator control O v e v e w p a g e
5 Home ZEEMS Previous zzzems The ZEEMS system is a Speed-Density design. This system measures the engine RPM (speed of the engine) and calculates the Density of the Air (from manifold pressure and temperature of the air) to determine the optimum fuel and air settings for the altitude and climatic conditions. 5 Slide 5
6 Home ZEEMS Previous zzzems Electric fuel pump, gasoline Input Sensors Fuel Tank, gasoline Fuel Return, RPM Coil Throttle Actuator Fuel Injector ECU Electronic Control Unit 6 Slide 6
7 Home INLET ZEEMS J30 R 9 Previous zzzems RETURN J30 R 7 3/8 SUPPLY 5/16 RETURN 7 Slide 7
8 ENGINE COOLANT
9 PUT A FEW DROPS OF OIL IN SUCTION SIDE OF PUMP WHEN FIRST INSTALLED Fuel pump rated at PSI (STALL PRESSURE > 50 PSI) Walboro GSL395
10 Vacuum pressure between the fuel filter and the fuel pump is 2 3 inches.
11 The ECU is the control center of the ZEEMS, A.K.A. processor, brain box, ECU (logic device) The ECU monitors the input sensors, compares to programmed look up tables ECU Electronic Control Unit and then controls the output devices. E C U p a g e 1
12 The Black Connector is generally used for low level current devices, such as input signals, transmit and receive signals, and other low voltage signals. Low voltage 6 v High voltage 16 v ECU Electronic Control Unit The White Connector is used for high current loads, such as battery power and ground and controlling the output devices. Battery Ground Feed Pins 20 & 21 on White Connector Battery Power Feed Pins 22 & 23 on White Connector C p a g e 2
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14 E C U E v e The ECU monitors input sensors 246 times every second. One engine event is an ignition pulse (spark plug firing). ECU Electronic Control Unit There are two distributor pulses (events) per engine revolution on a 4 cylinder, 4 cycle engine Therefore: 500 RPM = 1000 events 1000 RPM = 2000 events 2000 RPM = 4000 events P a g e 3 E n g i n e
15 The ZEEMS systems uses several input devices to monitor the engine and atmospheric conditions. ECU Inputs Engine RPM Engine Coolant Temperature (ECT) Intake Air Temperature (IAT) Manifold Absolute Pressure (MAP) Exhaust Gas Oxygen Sensor (EGO) ECU Electronic Control Unit
16 ECU Inputs Engine RPM RPM Engine RPM t s, ECU Electronic Control Unit Engine RPM is determined from the distributor tach signal. The time between events is used to calculate rpm. p a g e
17 Tach Ignition
18 ECU Inputs Engine RPM RPM ECU Electronic Control Unit Engine RPM For every ignition pulse, a signal is received at the ECU. The ECU then signals fuel injector to turn on and spray fuel at the precise time and duration.
19 ECT & IAT Engine Coolant Temp Sensor (ECT), Intake Air Temp Sensor (IAT) Both sensors are two (2) wire sensors. ECT The ECT is located in back of engine cylinder head. IAT ECU Inputs The IAT is located in the Throttle Body assembly. ECU Electronic Control Unit I n p u t s,
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21 ECT & IAT Engine Coolant Temp Sensor (ECT), Intake Air Temp Sensor (IAT) ECU Inputs ECT IAT ECU ECU monitors here The ECU monitors the ECT and IAT wires to determine the temperature changes. Sensors are electrically identical but are cosmetically different.
22 ECU Inputs Manifold Absolute Pressure Sensor MAP Manifold Absolute Pressure Sensor ECU Electronic Control Unit The MAP is located on valve cover side of the throttle body assembly and (held in place by an alum. plate. The MAP sensor is a three (3) wire sensor similar in operation to a potentiometer. Routing to the intake manifold source is accomplished by a passage way drilled from the throttle bore directly into the MAP.
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24 ECU Inputs Manifold Absolute Pressure Sensor MAP ECU Electronic Control Unit The MAP changes its internal resistance as the atmospheric or intake manifold pressure changes. The ECU calculates the barometric pressure when the key is turned on using the MAP sensor. As the engine starts/runs, the MAP s internal resistance changes causing the signal wire voltage to change.
25 ECU Inputs MAP Manifold Absolute Sensor ECU Electronic Control Unit The ECU sends a fixed 5 Vdc +/- 10% voltage to the MAP. The ECU monitors the signal wire to determine the barometric pressure and/or engine load changes. (intake manifold pressure). 5 volt DC Reference Voltage ECU monitors here
26 EGO Exhaust Gas Oxygen Sensor The EGO is located on the exhaust pipe within six (6) inches of the exhaust manifold flange. (15 cm) ECU Inputs ECU Electronic Control Unit This sensor is a four (4) wire sensor (2 signal, 2 heater) The ZEEMS system uses a heated EGO sensor. The EGO heater is a 12v heater controlled by the ignition switch. This is not controlled by the ECU. These are the white wires going to sensor harness.
27 EGO ECU Inputs Exhaust Gas Oxygen Sensor When the EGO sensor approaches 600 degrees F it starts to operate properly. ECU Electronic Control Unit An internal heater brings the EGO to its operating temp and maintains this temp if the exhaust gases temp decreases (at low idle speeds).
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30 EGO ECU Inputs Exhaust Gas Oxygen Sensor ECU Electronic Control Unit The EGO sensor generates a DC voltage (0-1Vdc) that is proportional to the difference of Oxygen content of the exhaust stream and outside air (Oxygen). When the Oxygen (O2) content in the exhaust stream goes up the voltage goes down.
31 ECU Inputs EGO Heater EGO Exhaust Gas Oxygen Sensor EGO EGO ECU Electronic Control Unit The EGO generates voltages between 0-1Vdc. The ECU monitors the signal wire to determine the O2 content of the exhaust stream. Key Switch On ECU monitors here
32 EGO Exhaust Gas Oxygen Sensor EGO ECU Inputs EGO Heater EGO Key Switch On Vdc ECU Electronic Control Unit ECU monitors here The ECU internally sends a voltage of Vdc to the EGO signal wire.
33 I n t The ZEEMS systems uses two output devices. Commands to the outputs are determined from input conditions. ECU Outputs O u t p u t Output Controls ECU Electronic Control Unit Governor Actuator Fuel Injector Fuel Pump C o n t r o l
34 Governor The Governor is an electric actuator which controls (turns) the throttle plate. ECU Outputs Governor Actuator The governor actuator motor is the only connection to the throttle plate. The governor uses two wires to control the actuator. ECU Electronic Control Unit A ground wire and the control circuit from the ECU.
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36 Governor The governor is located on the throttle body assembly and is the only part that is not field replaceable. The throttle plate has a mechanical stop. ECU Electronic Control Unit ECU Outputs Governor Actuator
37 To control the governor, the ECU uses two inputs: 4 - WAY SPEED SWITCH (use Prochem switch only) Governor ENGINE RPM From the RPM input (condition), the ECU commands the governor to increase or decrease the RPM depending on the engine load and other operating conditions to match the speed switch desired RPM. ECU Electronic Control Unit ECU Outputs Governor Actuator
38 Governor ECU Outputs The ECU controls the power side to the Governor with the ground coming from ECU. Speed Command Engine RPM ECU Electronic Control Unit ECU controls here Governor Actuator Coil High Side Switch Circuit
39 The duty cycle will vary according to the engine load, based on the throttle plate setting, ignition timing, quality of fuel and many other factors. The duty cycle must change as the demand for engine RPM is commanded. Governor ECU Electronic Control Unit ECU controls here ECU Outputs Governor Actuator Coil High Side Switch Circuit
40 Governor ECU Outputs Governor The proper RPM for the mechanical stop is dependant on engine. This screw is air flow set at Zenith and is tamper-resistant. ECU Electronic Control Unit The mechanical stop is required only to eliminate the Throttle Plate from sticking inside Bore.
41 Fuel Injector The Fuel Injector is an electric actuator which controls the fuel flow to the engine. The gasoline fuel injector is calibrated at 15 psi +/ AMPS TO OPEN INJECTOR ECU Electronic Control Unit ECU Output Fuel Injector
42 RED ONLY
43 To control the fuel injector, the ECU provides the power and controls the ground side of the circuit. The injector fires once per engine event and varies the pulse width (on-time) according to the engine conditions. The engine conditions are monitored by the input sensors and the the ECU commands the fuel injector with a longer or shorter pulse width (on time). Fuel Injector ECU Electronic Control Unit ECU Output Fuel Injector
44 The injector triggers once for every distributor references pulse going into the ECU. Engine RPM Fuel Injector 12 Vdc ECU Electronic Control Unit ECU Output Fuel Injector ECU controls here Low Side Switch Circuit
45 Fuel Injector ECU Output The ECU varies the amount of on-time of the injector by looking at the various input sensors of the engine. IAT EGO Engine RPM ECT MAP 12 Vdc ECU Electronic Control Unit Fuel Injector The ECU varies the injector pulse width Off ECU controls here Low Side Switch Circuit On
46 Base Ignition Timing checked with vacuum advance disconnected at Idle speed. 10 degrees BTDC IAT EGO RPM ECT MAP ECU Electronic Control Unit Ignition Timing ECU Output Ignition Timing
47 Key On Calculates or measures: Altitude, barometric pressure Coolant temperature Ambient temperature MAP ECU Electronic Control Unit ECU Turns on Fuel Pump This will be on for 2 seconds if a RPM signal is not received. Listen and feel the pump run. ECT IAT
48 Cranking MAP ECT ECU Electronic Control Unit Fuel pump is Running Injector Firing IAT RPM Governor is starting to control
49 Running MAP ECT Commanded Speed without EGO Sensor ECU Electronic Control Unit Fuel pump is Running Injector Firing IAT Governor is at specified controlled RPM RPM
50 EGO Running with EGO Sensor EGO Heater Key On Not ECU Controlled Commanded Speed MAP ECU Electronic Control Unit Fuel pump is running Injector Firing ECT Governor is at specified controlled RPM IAT RPM
51 Diagnostics
52 Home ZEEMS Previous zzzems A Service kit is available to diagnose all system components DEALER COST $ Slide 52
53 Home ZEEMS Previous zzzems Governor Self-Learn Procedures: 1. Start engine. 2. Set engine speed to medium or 1 tool on switch position. 3. Allow unit to run and warm up for 10 minutes. 4. Turn engine speed switch to idle and allow to run for 5 minutes. 5. The Self-Learn process is now complete. Precautions: Engine Temperature must be at 161 degrees ºF or above. 53 DO NOT TOUCH ANY FUNCTION DURING THIS PROCEDURE. Slide 53
54 Home ZEEMS Previous zzzems EVEREST EFI To read the codes with unit shut off turn the key on the amber light should flash a code 12 for 3 times then it will proceed to the next code. 54 Slide 54
55 Home ZEEMS Previous zzzems EVEREST EFI LOW OIL PRESSURE AMBER LIGHT WILL HAVE A CONTINUOUS (2 sec on, 2 sec off) SLOW FLASH If the units runs for 5 sec., shuts down and the amber light is continuous slow flash low oil or low oil pressure. 55 Slide 55
56 MMMMM MMMMM Home MMMMM M ZEEMS Previous MMMMMMMM MMMMMMMM MMMMMMMM WWWW MWW zzzems If the unit is shutting down and giving a code for oil pressure (slow flashing light) check oil then check switch. To check switch, remove wire from switch and ground the wire. If the unit continues to run change the switch. 56 Slide 56
57 Home ZEEMS Previous zzzems ENGINE HIGH COOLANT TEMPERATURE AMBER LIGHT WILL HAVE A CONTINIOUS ( ½ sec on, ½ sec off) FAST FLASH. If the units runs for 40 sec. shuts down and the amber light is continuous fast flash high engine temp. Shut down temp 219 deg. IF THE ENGINE IS OUT OF COOLANT IT WILL NOT SHUT DOWN. 57 Slide 57
58 Solid light Home ZEEMS Previous zzzems WHEN A SENSOR or ELECTRICAL CONNECTION GOES BAD A STEADY AMBER LIGHT WILL COME ON Coolant Air sensor Oxygen sensor Map sensor 58 Slide 58
59 Home ZEEMS Previous zzzems EVEREST EFI Once problem is taken care of, start the engine and use the orange/black wire (touch to ground) to clear the code. 59 Slide 59
60 Home ZEEMS Previous zzzems Full waste tank Unit will shut down and red full waste tank light will flash. If started with a full waste tank the unit will run for 40 sec. and shut down. 60 Slide 60
61 Input Sensor Quick Tests IAT Testing ECT Testing MAP Testing EGO Testing Distributor Reference
62 IAT and ECT Testing Remove wiring harness from sensor/s Install test harness to IAT or ECT sensor Measure the resistance values in Ohms and compare to chart below Temp F Temp C Nominal Resistance Minimum Resistance Maximum Resistance
63 IAT and ECT Testing Remove wiring harness from sensor/s Turn Key On Measure voltage between terminals A & B of the wiring harness going to the IAT or ECT Black Voltmeter lead to B, red lead to A Voltage should be 5 Vdc +/- 10% (Key on)
64 MAP Testing Complete ECU reference voltage test at MAP With the MAP connected in-circuit Connect a voltmeter as follows, key on Red lead to terminal B, black lead to ground Measure the Voltage values and compare to chart These voltages will vary according the current weather conditions at your location With plug disconnected koeo Black ground (check first) Orange (top) 5 volts Green (center) 5 volts Altitude above Sea Level Nominal Voltage DC
65 Fuel Injector Testing Disconnect wire/s to fuel injector Measure the resistance of the fuel injector Ohms is specification Turn Key on and measure voltage on the harness Volt meter red lead to terminal A, black lead to GROUND, turn key on (KOEO) DC Volts (with a fully charged battery)
66 Fuel Injector Testing Cranking engine. Install A noid light into harness. Crank engine, Noid light should flash. (brighter at first then dims) Tap test Using the fuel injector test leads (with inline fuse). Plug the test leads into the fuel injector. Tap the test leads to battery terminals momentarily. Fuel injector should activate ( click ). DO NOT HOLD THE TEST LEADS ON BATTERY
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68 Operating Fuel Pressure psi With return blocked PSI in fuel system
69 Return line pressure (free flow ) 1-2 PSI
70 IAT and ECT Temp F Temp C Nominal Resistance Minimum Resistance Maximum Resistance Fuel Injector Ohms Fuel Pressure Gasoline 15 psi +/- 1 MAP Altitude above Sea Level Nominal Voltage DC Governor Actuator Ohms 3 amp max current draw
71 EGO Testing With the EGO connected in-circuit Connect a voltmeter as follows, key on Red lead to Cavity B, black lead to Cavity A. Complete EGO test in machine per EGO testing sequence The EGO generates voltages between 0-1vDC
72 EGO Voltage Test (KOEO) Measure voltage to EGO Sensor Turn Key Off Leave harness installed to EGO Start Engine Voltmeter red lead to Cavity B on EGO Sensor Connector, black lead to Cavity A Results should be vdc when sensor is activated and engine running.
73 Governor Actuator Testing Disconnect wire/s to Governor Actuator Measure the resistance of the actuator Ohms is specification Turn Key on and measure voltage on the harness Volt meter red lead to terminal A, black lead to terminal B, turn key on (KOEO) Voltage is Pulse Width Modulated and will vary. (1.5-12
74 Ignition Timing Testing Start engine and monitor ignition timing From idle up to 1000 RPM, the ignition timing should be close to base timing setting Vacuum Advance of engine timing occurs through a vacuum port located on Throttle Body. If the ignition timing does not advance, suspect in this order; Vacuum hose disconnected,vacuum port clogged, Distributor malfunction
75 Diagnostics, No Start No Start Quick Tests Determine the following when cranking the engine No Fuel, with spark plugs firing No Spark, with fuel injection spray from injector Both No Fuel Spray and No Ignition Spark
76 No Start: No Fuel, w/spark Quick Tests Check fuel level in tank and fuel filter for blockage Check for the fuel pump running If fuel pump run is not running suspect faulty wiring to fuel pump.
77 No Start: No Fuel, w/spark Quick Tests (Tap Test) If the fuel pump runs operate the fuel injector manually as follows: Cycle key several times (off-on-off-on-off) Disconnect wiring harness to the fuel injector Connect one terminal of the injector to the battery plus (B+) with a fused jumper lead. Connect a test light to ground Tap the other terminal of the injector with the test light probe. When tapped, the test light should light and the injector should spray fuel
78 No Start: No Fuel, w/spark (Tap Test) If the fuel injector does not spray fuel and test light lights (a small click from the fuel injector will be heard when test light is tapped, no click is a faulty fuel injector): Suspect fuel is not getting to the injector or the fuel injector fuel passage is plugged If the fuel injector does not spray fuel and test light does not light when tapped: Suspect a faulty (open) fuel injector If the fuel injector sprays fuel when tapped: Suspect the fuel injector is not receiving signal/s from the ECU (wiring), a defective RPM signal to the ECU or a faulty ECU.
79 Both No Fuel Spray and No Ignition Spark Quick Tests Visually inspect system wiring and correct defects (no spark = no fuel) Verify power to the coil Inspect Ignition system completely
80 Diagnostic Trouble Codes Result What the ECU will do when it detects a fault condition. Trouble Code The code that will be displayed by the Engine Check Light. Trouble Flag Code that will be displayed on a laptop using the Zenith monitoring software while the engine is running. Code/Flag retained in memory with key off? Which flags and codes that will be retained for retrieval when the key is turned off. Check Engine Light The engine check light condition that the operator will see when a fault condition occurs. Trouble Code Operation: When the Engine Check Light is on continuous there will be trouble codes stored to retrieve. To retrieve codes: 1. With the engine off, turn the key to the on position. 2. The engine check light will flash once pause and flash twice to indicate a code 12. Code 12 indicates that the fault system is functioning. Code 12 will be flashed 3 times with a double pause between each. 3. The next trouble code will be displayed in the order of occurrence. It will also be flashed three times with a double pause between each. 4. After all trouble codes have been flashed three times, the codes will repeat starting with code 12. To clear the codes: 1. After all of the codes have been retrieved and conditions repaired, start the engine. With the engine running, momentarily ground the self learn wire. You will hear the engine hesitate as the ground is made and the engine check l
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82 Diagnostics Conclusion If all of these tests fail, suspect a faulty power or ground circuit/s to the ECU. If one or two of these tests fail, suspect a faulty ECU.
83 Diagnostic Review 93% Wiring 3% Input sensors 4% Actuator outputs <1% ECU Failures 93% Wiring <1% ECU Failures 4% Actuator 3% Outputs Input Sensors
84 Governor If the ECU or throttle body/governor assembly is replaced or the base idle setting is altered, the ECU must relearn the base throttle setting. This procedure takes 2-6 minutes during normal operation. This idle setting relearn procedure is a self-programming operation of the ECU ECU Electronic Control Unit ECU Outputs Governor
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88 Diagnostics White Connector Black Connector Pin # Wire Color Description Pin# Wire Color Description 1 Yellow 12v LP Request 1 Green Coolant Sensor 2 Brown/white LP Injector (Ground) (also pin #3) 2 White Pot input 0-5 V 3 Brown Gas Injector (Ground) 3 Green/black 5V output (pot) 4 Purple 12v output for fuel 4 Orange 5V output (MAP) 5 Tan signal to Governor 5 Yellow/Black (speed ground) 6 Empty 6 Empty (programming port) 7 Empty 7 Pink 12V to oil switch (typ.) 8 Gray 12v thru 10K resistor to pin 11 8 Orange/Black Self-Learn/fault lamp reset 9 12v input (optional) 9 Blue Air Temp Sensor 10 Empty 10 White/Black 02 sense input 11 Gray 5v from resistor pin 8 11 Black All Sensor Ground 12 Red/White Ground to diagnostic light 12 Black/White Signal ground for 02/pedal 13 Empty 13 Red/Black (speed ground) 14 Red/White 12V Neutral Switch 14 Empty 15 Red/Black 12V Injector 15 White/Black (speed ground) 16 Empty 16 Gray Idle validation 5Vl 17 12V input (optional) 17 Green MAP Sensor 5V input 18 Empty 18 Empty 19 Blue Distributor input (digital reading) 19 Empty 20 Black Ground 20 Empty 21 Black Ground 21 Empty 22 Red Power 22 Empty 23 Red Power 23 Empty
89 Home ZEEMS Previous zzzems CURRENT STOCKING EFI SERVICE PARTS Our part # Part Description Kit gasket manifold Engine wiring harness Assembly throttle Sensor coolant a Sensor air temp a Sensor map a Electronic control unit (ECU) Nissan A Filter fuel Pump fuel Sensor oxy a O-ring (injector) Reg. Fuel pressure Injector (with o-ring) 89 Slide 89
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91 Home ZEEMS Previous zzzems 91 Slide 91
92 Home ZEEMS Previous zzzems A Service kit is available to diagnose all system components. Zenith part number is C Slide 92
93 EFI Home PARTS ZEEMS Previous zzzems KIT GSKT MANFLD HARN ENG A ASSY THROTTLE SEN COOLANT A SEN AIR TEMP A SEN MAP A ECU NISSAN A FLTR FUEL PMP FUEL SEN OXY A Slide 93
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