94-95 LT-1/LT-4 OBDI Wiring Harness Street & Performance
Contents
1. 94 95 LTI 1 LT 4 OBDI 9 08 11 Wiring Harness INSTRUCTIONS amp SUPPLEMENTAL INFORMATION Street amp Performance 1 Hot Rod Lane Mena AR 71953 479 394 5711 fax 479 394 7113 email sales hotrodlane cc www hotrodlane cc Visit our web ONLINE TECH page for 24 hr service S amp P Adds an extra Blue Wire for Aftermarket Oil Pressure Gauge amp a Green Wire for Aftermarket Coolant Temp Check engine light Tach wire 4K pulse for speed control ALDL Connector Park Neutral switch Brake light switch Fuel Pump Relay Vats bypass Fuse Block 9A 12 volts crank and run 3 10 Oil Pressure sending unit 11 Three prong oil sending unit plug 12 Distributor plug 13 Ground wire 14 EGR Solenoid 15 Passenger side O2 sensor 16 Passenger side injector plugs 17 Driver side injector plugs 18 Hot wire to fuel pump 19 Starter battery terminal or to battery disconnect 20 Throttle position sensor 21 Idle air motor 22 Charcoal canister purge 23 MAP sensor 24 Air temp sensor 25 Driver side O2 sensor 26 Knock sensor 27 Knock sensor _ 28 Vehicle speed sensor 29 4L60E Transmission plug 30 MASS AIR FLOW 31 Engine temp sensor 32 Coil Plug 33 Coil Driver Plug OONHNOGRONA Red Plug 7 White Plug qe IV 6 1 a 95 97 Y 94 95 LT 1 Distributor harness Should be saved used from factory harness Can be purchased from S amp P Check engine light2. Brown wire is the ground side of the curciut you will have to supply 12 volts to the other side Tach wire White 4K pulse for speed or cruise control green wire ALDL Connector used to plug in scanning tool Park Neutral switch Orange wire if desired closed in park neutral to ground Brake light switch Purple wire Normally closed Hot all the time the ignition is on except when brake is applied to take the torque converter out of lock up If you have the 2 prong pressure switch you will need S8P s brake switch relay kit Fuel Pump Relay GM part 414078915 Vats bypass Not needed if you have your computer reprogrammed Fuse Block 9A 12 volts crank and run Red Must have 12volts in run position and a minimum of 10 volts in crank 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 position Oil Pressure sending unit White wire For use with GM gauge with sending unit 410201491 ONLY with after market gauges you must use their sending unit Three prong oil sending unit plug gray plug with green seal and brown white and orange wires Backup system for fuel pump Turns fuel pump off when pressure drops Distributor plug Black plug with tan seal and red yellow purple and black wires Plugs into harness coming from the distributor The OEM distributor pig tail should be coming from the distributor Ground wire black w
3. Corvette s cast Iron headed SS Cad and Buick used two knock sensors IROC TA used 1994 4160e has 12 pins in Large one knock sensor Check the knock module in Transmission plug your computer with the chart above to insure 1995 amp later 4160e has 13 pins in Large that you have the proper module for your Transmission plug engine This is needed to correctly program the transmission part of the computer When Sending in an ECM to be Programmed include Year Model Tire size or Rollout Type of Transmission If running Maf or NON MAF and Emissions or NON EMISSIONS Street amp Performance Inc e 479 394 5711 e Fax 479 394 7113 e Website www hotrodlane cc e E mail sales hotrodlane cc LT1 HARNESS INSTRUCTIONS Visit our web ONLINE TECH page for 24 hr service The following instructions are intended as an aid to assist in harness installation More in depth information can be obtained by ordering the applicable GM service manual Trouble shooting techniques and diagnosis are beyond the scope of these instructions Diagnostic flow charts and trouble shooting advice are included in the service manual or S amp P s web site The general design of the harness allows for computer mounting in the glove box area or out under the hood If placed under the hood position the computer to where the plug ins are pointing downward to allow for moisture drainage Special harness lengths can be provided on an as order basis All harness connectio
4. LT1 LT4 DVD will assist you in keeping from making those costly mistakes with step by step instructions and troubleshooting Your guide to fuel systems cooling systems transmissions electronics for all LT series engines 92 97 CALL IN AND REQUEST YOUR FREE LT DVD 1 LT1 Vette Balancer 2 LT4 Balancer Street and Performance Phone 479 394 5711 Fax 479 394 7113 www hotrodlane cc 5 S amp P Balancer Spacer IROC TA 6 S amp P Balancer Spacer Vette IROC TA needs item 3 to align balancer and brackets Cast Iron Headed LT 1 s need item 6 for alignment Street and Performance Phone 479 394 5711 Fax 479 394 7113 www hotrodlane cc 1 Hot Rod Lane Mena Arkansas 71953 Ph 479 394 5711 Fax 479 394 7113 www hotrodlane cc relay logie If you have a 2 prong pressure brake switch you will need this ma AT brake switch relay kit also necessary to interrupt current to the vara misica longue corrverter lockup solenoid circuit when ihe brakes are applied When the brakes are released power is restored to he lockup solenoid poe rt mo Ta Brake Lite ink m mu 12 Volto mah md 12 vali ignition hydraulic brake switch hiark l GROUND H orange To purple torgue converter lock up wire NOT USED Hook to red brake wire 12 Volts ALL THE TIME For brake light with brake OFE 12 Volts with brake on ONLY NO VOLTAGE WITH BRAKE ON 12 Volts In 12 Volts In eli GM B
5. This T can be eee purchased from SAP m
6. 1 ONLY With after market gauges you must use their sending unit 5 ENGINE GROUND The ground system is critical for proper operation A good battery to motor motor to frame motor to body harness ground to engine is essential 6 BATTERY STARTER TERMINAL A 14 gauge fuse linked wire is connected to the starter terminal This provides 12V keep alive power to the computer If you have a battery disconnect you must hook this wire to the hot side of the battery disconnect It also feeds the fuel pump relay and the oil pressure sending unit 2 Plug 4 Pin Connector Street 8 Performance Inc dy e 479 394 5711 e Fax 479 394 7113 v o Website www hotrodlane cc S amp P REMOTE COIL MOUNTING BRACKET Includes alunimun bracket mounting bolts e E mail sales hotrodlane cc and spacers and instructions SUPPLEMENTAL INFORMATION COMPUTER PCM The PCM operates on a negative ground system Inadvertent connection of the battery leads in reverse will damage the computer The constant battery feed to the computer should not be interrupted unless trouble codes are being erased from computer memory FUEL PRESSURE For all multi port systems a high pressure electric pump in required With Key On Engine Off the pressure should read 45 48 lbs With engine idling the pressure will drop off 8 to 10 lbs You MUST use a fuel filter that is designed for the high volume of fuel flow that is required for fuel injection such as a AC Delco
7. GF481 Street amp Performance has this filter available with mounting bracket and fittings SYSTEM POWER Full battery voltage is utilized by the injection system Do not incorporate any ballast resistance in the ignition coil circuit or the computer ignition feed A minimum of a 105 AMP preferably 125 AMP or higher alternator should be used GAUGES Two white wires exit the harness near the computer One is for a tach if desired and the other is for an oil pressure gauge GM compatible gauges only DIAGNOSIS To display diagnostic trouble codes use a SCANNER Grounding the DLC will not flash DTC s but will enable most outputs when the ignition is ON engine OFF Grounding the DLC while the engine is running will cause the MIL to flash to indicate OPEN or CLOSED LOOP This is referred to as FIELD SERVICE MODE To clear the DTC s from memory use the SCANNER or Ignition OFF Disconnect the 4 fuse located in the instrument panel fuse block for 30 seconds since the PCM can have a failure which may affect only one circuit following the diagnostic procedures in this section will determine which circuit has a problem and where it is 7 THROTTLE POSITION SENSOR Returns a proportional voltage to the computer that relates to the angular position of the throttle plates Relaxed throttle low voltage approx 8V wide open throttle high voltage approx 4 5V Be careful not to get TPI sensor wet when washing the engine Problems w
8. NSOR The scanner displays grams per second The PCM converts the mass air flow sensor input signal into grams per second indicating the amount of air flow entering the engine Street amp Performance can remove the MAF by reprogramming the computer and using a S amp P air cleaner with a ZR1 air temp sensor Part 425036751 Problems with the MAF sensor will cause a PO100 101 102 103 error code when scanned 18 VEHICLE SPEED SENSOR VSS The Vehicle Speed Sensor VSS is a pulse counter type input that informs the PCM how fast the vehicle is being driven The VSS system uses an inductive sensor mounted in the tail housing of the transmission and a toothed reluctor wheel on the tail shaft As the reluctor rotates the teeth alternately interfere with the magnetic field of the sensor creating an induced voltage pulse lf you do not have a programmable speedometer S amp P can program you computer for your gear ratio and tire roll out to insure proper gear change and speedometer reading 19 Evap Canister Purge Solenoid EGR Does not have to be hooked up on NON EMISSION 1974 and earlier vehicles Street amp Performance Street amp Performance NETA HOUSING m m m e ali HOUSIN It allows YOU to EGR Block off Plate Rear exit fuel line kit y l install the manual speedometer on the 4L60E Transmission while retaining electric VSS Please specify gear ratio and tire roll out 00000000 Tail Housing Kit 375 00 LT1 LT4 DVD S amp P s
9. cted Ignition Control IC Circuit Open Circuit Ignition Control IC Circuit Grounded or Shorted Circuit Knock Sensor KS Circuit Bank Left Oxygen Sensor O2S Circuit Lean Exhaust Indicated Bank Left Oxygen Sensor O2S Circuit Rich Exhaust Indicated Personal Automotive Security System PASS Key 11 Circuit MASS Air Flow MAF System Voltage Low PROM Error Faulty or Incorrect PROM System Voltage High Fuel Lean Monitor A C System Performance Bank 2 Right Oxygen Sensor 025 Circuit Open Circuit Bank 2 Right Oxygen Sensor O2S Circuit Lean Exhaust Indicated Bank 2 Right Oxygen Sensor O2S Circuit Rich Exhaust Indicated A C Refrigerant Pressure Sensor Circuit Open or Shorted A C Refrigerant Pressure Sensor Circuit Pressure Sensor or A C Clutch Circuit Problem A C Relay Circuit Shorted Circuit A C Clutch Circuit A C Evaporator Temperature Sensor Circuit Open or Shorted Vehicle Speed Sensor Loss Pressure Control Solenoid PCS Circuit Traction Control System TCS Circuit Low Transmission System Voltage Low Cooling Fan Relay Control Transmission Fluid Overtemp Transmission 2 3 Shift Solenoid Circuit Transmission 1 2 Shift Solenoid Circuit DTC 83 Reverse Inhibit System Manual Transmission DTC 83 TCC PWM Solenoid Circuit Fault Automatic Transmission DTC 84 Automatic Transmission 3 2 Control Solenoid Circuit DTC 84 Skip Shift Solenoid Circuit Manual Transmission DTC 85 Tra
10. cuum lines AC Delco distributor and accessories are available from Street amp Performance 13 AUTOMATIC LINE DIAGNOSTIC LINK ALDL used in conjunction with the check engine light 14 OXYGEN SENSOR Four oxygen sensors are used in a factory computer configuration Two for each engine bank one before the catalytic converter and one after Street amp Performance can reprogram the computer to remove the rear oxygen sensors as well as other emission components for non emission vehicles only When the exhaust temperature has reached 600 degrees F the oxygen sensor places the system in closed loop operation and maintains an air fuel ratio of 14 7 to 1 During wide open throttle conditions this input is ignored and a richer air fuel mixture is supplied Problems with the oxygen sensor will cause a error code of PO131 132 133 134 135 for bank 1 or PO137 138 140 141 for bank 2 15 KNOCK SENSOR Two knock sensors are used one for each bank If a knock is detected the computer will automatically retard the timing DO NOT place Knock sensor wire close to spark plug wire GM 10456126 This sensor can not be substituted for any other 16 PARK NEUTRAL POSITION PNP SWITCH The Park Neutral position PNP switch indicates to the PCM when the transmission is in park neutral or drive This information is used for the EGR and the IAC valve operation AUTOMATIC ONLY EGR wire can be tied up out of the way for a NON Emmission application 17 MAF SE
11. ire Must have a good clean ground to the back of engine and battery must ground to the engine or transmission engine to frame and engine to body EGR Solenoid Black plug with gray seal and red gray wire Used only in emission vehicles Passenger side O2 sensor Black plug with tan seal and brown purple black and pink wires Passenger side injector plugs Driver side injector plugs Hot wire to fuel pump Single brown wire Fused amp relayed in harness Just extend to fuel pump Starter battery terminal or to battery disconnect Fusible link Throttle position sensor Black plug with purple seal and black gray blue wires Idle air motor Black plug with blue seal and white red brown yellow wires Charcoal canister purge Red plug with gray seal red and white wires Not needed for non emission vehicles MAP sensor Green Plug with green seal and gray green and black wires MAP sensor must have vacuum from intake manifold Air temp sensor Gray plug with blue seal and red black wire With S amp P air cleaner use GM sensor 25036751 which will screw into the back plate of the air cleaner Driver side O2 sensor Black plug with tan seal and brown purple black and pink wires Knock sensor Gray plug with blue wire Driver side Not used on IROC TA GM 10456126 Knock sensor Gray plug with blue wire Passenger side is used on all LT 1 GM 10456126 Vehicle speed sensor Black plug with blue seal and twisted yellow and p
12. ith the throttle position sensor will cause a P0121 122 123 error code when scanned 8 IDLE AIR CONTROL VALVE Computer controlled stepper motor which adjusts engine idle at different loads 9 COOLANT TEMP SENSOR Returns a proportional voltage to the computer that relates to the coolant temp Cold high voltage hot low voltage 10 AIR TEMP SENSOR Operates in the same fashion as the coolant temp sensor except it relates to the air temp entering the plenum Street amp Performance Inc e 479 394 5711 e Fax 479 394 7113 e Website www hotrodlane cc e E mail sales hotrodlane cc 11 CHECK ENGINE LIGHT One Tan wire is provided You must provided a hot wire and bulb to use a check engine light Any 12V automotive light will work lt can be mounted as a permanent fixture in the dash or used as a diagnostic aid only The red wire is hot when the key is in start or run 2 DISTRIBUTOR Located at the front of the motor and is crankshaft driven This ignition system requires no initial timing adjustment 95 needs to have the vacuum line from the distributor with the check valve must hook to the intake vacuum port and the other line needs to be routed to the air cleaner Be careful not to get distributor wet when washing the engine S amp P DOES NOT recommend the used of remanufactured distributors Use only GM or AC Delco Street amp Performance carries a complete line of LT 1 LT 4 parts FIRING ORDER 1843658732 Replacement Va
13. ns are clearly tagged The injectors are pulsed simultaneously so any injector plug can connect to any injector However the injector plug lengths will indicate which injector to connect and will result in a neat and professional installation The following information will briefly discuss the individual harness connections 1 IGNITION The single ignition wire must be connected to provide 12V with the key in START crank and RUN position 12V is then distributed through the fuse block to the computer ECM injectors and coil The fuse block has four 10 amp fuses Each injector bank is fused as is the computer and coil Stock 55 67 GM ignition switches DO NOT allow 12v in run position These Switches need to be Changed or Do a Jumper from Ignition 1 to Ignition 2 2 MAP SENSOR Manifold absolute pressure This sensor will use original harness Run a vacuum line from a port on the passenger side of the plenum to the port on the MAP sensor Problems with the Map sensor will cause a P0106 107 108 error code when scanned 3 FUEL PUMP HOT FEED Provides 12V to the fuel pump A fuel pump relay is also provided with the harness and is energized de energized by the ECM 4 OIL PRESSURE SENDING UNIT Located at the rear driver side of the manifold It is a backup system in the event the fuel pump relay should fall Any time oil pressure is above 5 lbs 12V is available for the fuel pump White wire For use with GM gauge with sending unit 1020149
14. nsmission TCC Stuck ON DTC 90 Transmission TCC Solenoid Circuit DTC 91 Skip Shifr Lamp Circuit Manual Transmission DTC 97 VSS Output Circuit DTC 99 Tach Output Circuit A Throttle Body T P I 92 93 LT1 One Wire GM 25166816 AC DELCO AFS21 B Throttle Body T P I 92 93 LT1 Three Wire GM 25176708 AC DELCO 213 632 B2 S amp P Pig Tail to convert from One Wire System to a Heated Three Wire System C 94 96 LT1 Vette 94 96 BUICK CAD 94 97 IROC TA Four Wire O2 Sensor GM 25312184 AC DELCO AFS 75 C is also used for 97 04 LS1 Factory Corvette Engines S amp P LS1 Harness uses IROC 02 Sensor D D 98 02 LS1 IROC TA Engines GM 25312197 AC DELCO AFS98 E 05 LS2 with Square Plug GM 12587785 AC DELCO 213 1702 E O Street amp Performance 3 A 1 Hot Rod Lane Phone 479 394 5711 AS P O Box 1169 Fax 479 394 7113 3 Mena Arkansas U S A 71953 www hotrodlane cc sales hotrodlane cc LT WATER PASSAGE ie JM N E 1 To bottom of radiator 2 To heater core out from pump into heater core 3 From heater core into pump from heater core 4 To top of radiator 5 Coolant bleed valve Used to remove air from coolant system iii dia JER You can drill and tap the top of the water pump pli and install a 1 4 pipe 90 degree fitting to run a Y A line to the bottom of the throttlebody or you can ee run a line from the bottom of the throttlebody to EMO a Tin the radiator hose
15. rake Switch 425524845 AC Delco HD850A CODE DTC 13 DTC 14 DTC 15 DTC 16 DTC 21 DTC 22 DTC 23 DTC 24 DTC 25 DTC 26 DTC 27 DTC 28 DTC 32 DTC 33 DTC 34 DTC 36 DTC 41 DTC 42 DTC 43 DTC 44 DTC 45 DTC 46 DTC 48 DTC 50 DTC 51 DTC 53 DTC 55 DTC 61 DTC 63 DTC 64 DTC 65 DTC 66 DTC 67 DTC 68 DTC 69 DTC 71 DTC 72 DTC 73 DTC 74 DTC 75 DTC 77 DTC 79 DTC 81 DTC 82 LI1 94 95 TROUBLE CODES Visit our website for tech help in trouble shooting codes www hotrodlane cc then click on ONLINE TECH DESCRIPTION Bank 1 Left Oxygen Sensor 025 Circuit Open Circuit Engine Coolant Temperature ECT Sensor Circuit High Temp Indicated Engine Coolant Temperature ECT Sensor Circuit Low Temp Indicated Distributor Ignition System Low Resolution Pulse Throttle Position TP Sensor Circuit Signal Voltage High Throttle Position TP Sensor Circuit Signal Voltage Low Intake Air Temperature IAT Sensor Circuit Low Temp Indicated Vehicle Speed Sensor VSS Circuit Intake Air Temperature IAT Sensor Circuit High Temp Indicated EVAP Canister Purge Solenoid EGR Vacuum Transmission Range Pressure Switch Exhaust Gas Recirculation EGR Circuit Manifold Absolute Pressure MAP Sensor Circuit Signal Voltage High Low Vacuum Manifold Absolute Pressure MAP Sensor Circuit Signal Voltage Low High Vacuum Distributor Ignition System Faulty High Resolution Pulse or Extra Low Resolution Pulse Dete
16. urple wires Plugs into transmission tail housing 120 thousand pulse per mile 4L60E Transmission plug Big gray plug Transmission plug MASS AIR FLOW Black plug with purple seal and yellow black and red wires Used if desired Engine temp sensor Black plug with blue seal and yellow and black wires Sensor located on water pump Coil Plug Beige plug with purple seal and white and red wires Coil Driver Plug Black plug with blue seal and red white black and green wires Street amp Performance Inc e 479 394 5711 e Fax 479 394 7113 e Website www hotrodlane cc e E mail sales hotrodlane cc THIS HARNESS IS EQUIPPED WITH TWO KNOCK SENSOR LEADS DEPENDING ON a WHICH KNOCK SENSOR MODULE IS IN THE COMPUTER DETERMINE HOW MANY KNOCK pe SENSORS YOU NEED CHECK THE LIST BELOW FOR WHICH SENSOR IS USED IF ONLY ONE SENSOR IS NEEDED TIE EXTRA SENSOR LEAD BACK ACCESS COVER ON BOTTOM OF COMPUTER PART NUMBER OF SENSOR MODULE 16188309 16188709 gt ALL USE 2 KNOCK SENSOR 16177690 16177700 lt USES 1 KNOCK SENSOR x KNOCK SENSOR MODULE PCM ed S amp P can reprogram your comput er to provide improved drivability remove emissions and reconfigure MA your gear ratio and tire rollout for x A MA better performance Computers E t ban be programmed on exchange AS basis mi ii Na E 94 Computer 16188051 VIN 2G2FV22P6R2202147 95 Computer 16188051 VIN 2G1FP22P6S2128121
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