Connections Shown in the Same Orientation As the ECU

www.gtfours.co.uk GT4 ST165 ECU PINOUT DIAGRAM

Revision 5 – 31/08/05

Connections shown in the same orientation as the ECU.

Notes 1. Items highlighted in red are suspect and need to be verified. Do you have the answer to the missing info? Please e-mail me! 2. This article is for the 1989 3S-GTE engine 3. Downloaded from – www.gtfours.co.uk 4. E-mail – [email protected]

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Bottom row of pins on the ECU

Abbreviation Wire colour Means... What does it do? Anything else?

E01 White/Black Earth Attached to engine block Opens a valve below the ISC-1 Green/White Idle Stabilisation Control throttle body to control the idle speed rpm 12V fed to the ECU whilst STA Black Starting signal the car is trying to start Signal to control the 5th STJ Green Cold start injector injector when starting the car #1 Red/Black Injector signal Fires No 1 fuel injector #2 Light Green Injector signal Fires No 2 fuel injector G- Red Distributor signals Ground for G1, G2 and NE Allows ECU to determine the position Sends crankshaft angle G1 Dark Green Distributor signals of each piston, adjust information injector and ignition timing Sends crankshaft angle As above, but 180o out G2 White Distributor signals information from G1 Sends the engine speed and Positive signal from 24 NE Black Engine rpm signal crankshaft angle to the ECU tooth sensor If it doesn't activate Clicks on the fuel relay when FPR Blue/Red Fuel Pump Relay the fuel replay the car you turn the ignition key won't start Used to detect a fault IGF White/Red Spark confirmation signal within the igniter Probably used to Informs ECU of water THW Red Water temperature sensor correct fuel and ignition temperature maps WIN Light Green/Black Intercooler computer signal Error reporting? Don't cut this wire, pull Allows extra boost pressure the pipe off from the TPC Black/White TVSV signal in 3+ gears ~2psi wastegate actuator instead! SPD Blue/White Speed sensor Monitors car speed To inform the ECU when Monitors the brake light STP Green/White Stop light switch braking, to apply switch deceleration fuel cut Tells the ECU the temp of THA Grey AFM air intake temp the incoming air VS Grey/Black AFM signal Stopped – idle signal Variable – flap position VC Pink/Blue AFM signal signal Permanent 12V feed to Supplies power to ECU via BATT Pink Battery supply the battery even when the 15A engine bay fuse the ignition is off Increases idle speed due to ELS Orange Electrical idle up large current drawn by headlights and demister

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Top row of pins on the ECU

Abbreviation Wire colour Means... What does it do? Anything else?

E02 White/Black Earth Attached to engine block Opens a valve below the ISC-2 Green/Black Idle Stabilisation Control throttle body to control the idle speed rpm IGT White Igniter signal Control spark to spark plugs E1 Brown Earth Attached to engine block Opens a set of butterflies in TVIS Light Green Operates TVIS VSV the intake manifold at 4300rpm #3 Yellow Injector signal Fires No 3 fuel injector #4 Blue Injector signal Fires No 4 fuel injector VF Violet/Yellow Diagnostic connector Check connector? Any connections off? T Orange Diagnostic connector Check connector? Any connections off? Informs ECU of throttle Very fine setup of the VTA White Throttle position sensor position TPS sensor is required Tells the ECU the car is at Signal is from throttle IDL Pink Idle signal idle position sensor HT Red/Green To lambda sensor 12V lambda sensor heater A voltage feedback from the Also feeds the OX pin OX White Lambda sensor voltage exhaust to "tune" the engine at the diagnostic whilst at a steady rpm connector E2 Brown Earth E22 Brown Earth for AFM EGR Blue/Red EGR VSV Operates the EGR Engages the AC compressor A/C Black/White Clutch relay signal magnetic clutch Indicates via a series Puts on the yellow engine W Green Check engine light of codes any stored check light faults Sends a signal to the fuel FPU Black/Red FPR control pressure VSV to increase the fuel pressure Sensor feeds in a voltage to If knock is sensed then the ECU proportional to the KNK Clear Knock sensor the ignition timing is amount of knock in the retarded engine... This signal is altered with an FCD if you want Feeds a voltage to the ECU to run higher than PIM Red/White TPS voltage proportional to the boost stock boost. Also pressure controls the dash boost gauge Only fitted to USA THG Blue EGR temp sensor Not fitted in UK cars 12V fed after ignition key is +B Black/Yellow 12V supply to ECU turned Good place to attach items that you don't 12V fed after ignition key is +B1 Black/Yellow 12V supply to ECU want to stay on after turned engine turned off e.g. BG light

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