Holley 534-55 Installation, Tuning, & Troubleshooting Manual Download

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DIGITAL REPLACEMENT FOR THE

ELECTRONIC CONTROL UNIT

INSTALLATION, TUNING, &

TROUBLESHOOTING

MANUAL

OPTIONAL EQUIPMENT

534-54 Closed Loop Kit for Digital Replacement ECU

534-50 Rich/Lean Indicator without O

Sensor

534-51 Rich/Lean Indicator with O

Sensor

534-56 Replacement Closed Loop Kit Harness

NOTE: These instructions must be read and fully understood before

installation. If this manual is not fully understood, installation should
not be attempted.

Summary of Contents for 534-55

Page 1: ...osed Loop Kit for Digital Replacement ECU 534 50 Rich Lean Indicator without O2 Sensor 534 51 Rich Lean Indicator with O2 Sensor 534 56 Replacement Closed Loop Kit Harness NOTE These instructions must...

Page 2: ...THE ENGINE 7 SETTING THE MECHANICAL IDLE 7 SETTING THE THROTTLE POSITION SENSOR TPS 8 TUNING THE DIGITAL ECU FOR PERFORMANCE 9 Tuning the Main 9 Tuning the Idle 10 Tuning the Accel 10 Tuning the High...

Page 3: ...various operating conditions is user adjustable through the use of five adjustments knobs located on the front panel of the digital ECU These adjustment knobs are used to tune the system WARNING The...

Page 4: ...d to ensure that no damage will occur WARNING Do NOT mount the ECU in the engine compartment The ECU is not designed for the environment heat moisture present in the engine compartment Premature failu...

Page 5: ...l lines and to build pressure in the fuel injection system The digital ECU senses whether the pink wire in the harness is attached to switched 12 volts or to ground The ECU then internally selects whe...

Page 6: ...allows the user to adjust the fuel delivery in the idle region of the fuel map 30 above or below the values that are set at the factory This is accomplished by moving the lower part of the fuel map e...

Page 7: ...ensure that they were not moved If necessary rotate the potentiometers so that they are positioned as shown in Figure 3 5 Turn the ignition key to the RUN position DO NOT START THE ENGINE Listen for...

Page 8: ...must be set in the position outlined below 1 Unplug the three position connector from the TPS and attach jumper wires between the TPS and the connector 2 Remove a portion of the insulation on the jum...

Page 9: ...U is critical in the operation of the fuel injection system and is best accomplished by using a tachometer If your vehicle is not equipped with a tachometer Holley highly recommends one be used To adj...

Page 10: ...ustments made here allow for a quick crisp response during acceleration WARNING Do not attempt to perform acceleration tests on a busy road or highway Complete this stage of the tuning process in an a...

Page 11: ...Use of Leaded fuels will DESTROY the oxygen sensor and will result in incorrect exhaust gas oxygen readings WARNING The use of some RTV Silicone sealant will destroy the oxygen sensor Ensure that the...

Page 12: ...he wiring harness away from any direct sources of heat and moving parts from the oxygen sensor to the rear of the ECU Secure the wiring harness with wire ties or wire clamps 8 Reconnect the primary wi...

Page 13: ...t stalls after starter motor disengages No voltage to relay switched power input with ignition in RUN position No TACH signal Check switched power connection to relay with ignition in RUN position Che...

Page 14: ...nd repair wire Replace ECU K Low Fuel Pressure Low Voltage at fuel pump Kinked or restricted fuel line Faulty fuel pump Throttle body pressure regulator improperly adjusted Low fuel level in tank Rest...

Page 15: ...temperature sensor in boiling water should be approximately 182 k NOTE If the resistance values of your engine coolant temperature sensor do not match these values the temperature sensor must be repla...

Page 16: ...rminals with no power applied to the relay s coil the relay must be replaced 4 Connect terminal 86 to ground 5 Connect terminal 85 to a positive 12 Volt power source 6 With a digital volt ohm meter ch...