s4 t2 no injector pulse
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s4 t2 no injector pulse
quick question, what signals the injector to pulse. im getting strong spark from the coils, i hear the fuel pump running while cranking. only thing is no injector pulse. maf is connected, i cant figure out what else to check. thanks in advance
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i just realized i was doing it wrong, i was checking those wires for positive using a grounded test light. i should of been looking for negative. ill check in the morning, but i feel my problem is still on the power side. is the black yellow wire suppose to have constant positive when igntion is on?
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#8
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i just realized i was doing it wrong, i was checking those wires for positive using a grounded test light. i should of been looking for negative. ill check in the morning, but i feel my problem is still on the power side. is the black yellow wire suppose to have constant positive when igntion is on?
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I used a probe and checked at the injector and with the car cranking, i found pulsing negative on one side and open circuit on the other. my question now is where is this b/y wire leading to the injectors. i cant seem to find it anywhere
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Each injector has two wires. One is the B/Y wire. You won't be able to test it unless you pull off the UIM as it relates to the primary injectors or test the wire at the secondary injectors. Conversely, you can check the B/Y wire at one of two other places. At FEM-02 or at the Main Relay.
Also, if the trigger wires at the ECU had 12 volts w/key to on then that means the B/Y wire is receiving voltage at the injectors.
And if you have the resistor box for low impedance injectors you won't have B/Y wires at the injector as they will be Brown.
Lastly, if you used an LED light you could tell whether the primary injectors were being pulsed or not. One wire of the light would be placed to pin 3I (B/W wire) and the other wire to the trigger wire and w/key to start the light should flash.
Also, if the trigger wires at the ECU had 12 volts w/key to on then that means the B/Y wire is receiving voltage at the injectors.
And if you have the resistor box for low impedance injectors you won't have B/Y wires at the injector as they will be Brown.
Lastly, if you used an LED light you could tell whether the primary injectors were being pulsed or not. One wire of the light would be placed to pin 3I (B/W wire) and the other wire to the trigger wire and w/key to start the light should flash.
Last edited by satch; 07-02-14 at 11:28 AM.
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Each injector has two wires. One is the B/Y wire. You won't be able to test it unless you pull off the UIM as it relates to the primary injectors or test the wire at the secondary injectors. Conversely, you can check the B/Y wire at one of two other places. At FEM-02 or at the Main Relay.
Also, if the trigger wires at the ECU had 12 volts w/key to on then that means the B/Y wire is receiving voltage at the injectors.
And if you have the resistor box for low impedance injectors you won't have B/Y wires at the injector as they will be Brown.
Lastly, if you used an LED light you could tell whether the primary injectors were being pulsed or not. One wire of the light would be placed to pin 3I (B/W wire) and the other wire to the trigger wire and w/key to start the light should flash.
Also, if the trigger wires at the ECU had 12 volts w/key to on then that means the B/Y wire is receiving voltage at the injectors.
And if you have the resistor box for low impedance injectors you won't have B/Y wires at the injector as they will be Brown.
Lastly, if you used an LED light you could tell whether the primary injectors were being pulsed or not. One wire of the light would be placed to pin 3I (B/W wire) and the other wire to the trigger wire and w/key to start the light should flash.
#13
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Isn't there a way to check primaries? I think with ignition on you spin the CAS and listen for clicking using a probe going down touching the injectors. Or something like that.
Or at the ECU, with ign. on, ECU plugged in, grounding the injector ground signal wires by back-probing, using a jumper wire.
Or at the ECU, with ign. on, ECU plugged in, grounding the injector ground signal wires by back-probing, using a jumper wire.
#14
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FWIW, I once had a resistor box that had an open in one of the primary injector circuits. The resistor is mounted below the air box and has a five-pin oval plug. Can't miss it. You should have a similar resistance between one common wire and the four branching to the injectors.
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Isn't there a way to check primaries? I think with ignition on you spin the CAS and listen for clicking using a probe going down touching the injectors. Or something like that.
Or at the ECU, with ign. on, ECU plugged in, grounding the injector ground signal wires by back-probing, using a jumper wire.
Or at the ECU, with ign. on, ECU plugged in, grounding the injector ground signal wires by back-probing, using a jumper wire.
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Isn't there a way to check primaries? I think with ignition on you spin the CAS and listen for clicking using a probe going down touching the injectors. Or something like that.
Or at the ECU, with ign. on, ECU plugged in, grounding the injector ground signal wires by back-probing, using a jumper wire.
Or at the ECU, with ign. on, ECU plugged in, grounding the injector ground signal wires by back-probing, using a jumper wire.
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