Kam Posted November 5, 2021 Report Share Posted November 5, 2021 Hi, Wired a standalone Xtreme G4X to a GM LQ4 engine and attempted to start with no luck; I've got Cranking RPM, Trig 1 and Trig 2 , no sync loss... Spark Plugs Fire on all 8, TPS, MAP, Baro, Coolant, IAT, Battery Voltage.. ALL GOOD No Injector pulse on Injector Test Mode at all, the inj pulse and inj duty gauges stay still at 0 on testing, but they move on cranking normally but the injectors don't pulsate The fuel pump is not wired to the ecu and is always ON so no Aux Output is used Measured Voltage between the Inj Output Pins and +12V, Key ON Position I get +6V and +4.88V at Cranking What could the issue be ? Thanks for the help Quote Link to comment Share on other sites More sharing options...
Adamw Posted November 5, 2021 Report Share Posted November 5, 2021 Attach your tune and a log of it cranking Quote Link to comment Share on other sites More sharing options...
Kam Posted November 5, 2021 Author Report Share Posted November 5, 2021 26 minutes ago, Adamw said: Attach your tune and a log of it cranking Start Setup .pclx Log ASAP Thank You Quote Link to comment Share on other sites More sharing options...
Adamw Posted November 6, 2021 Report Share Posted November 6, 2021 3 hours ago, Kam said: Measured Voltage between the Inj Output Pins and +12V, Key ON Position I get +6V and +4.88V at Cranking There should be 12V on both sides of the injector with ign on. Sounds like you need to trace back to the injector power supply to see where it is missing. Quote Link to comment Share on other sites More sharing options...
Kam Posted November 8, 2021 Author Report Share Posted November 8, 2021 On 11/6/2021 at 2:19 AM, Adamw said: There should be 12V on both sides of the injector with ign on. Sounds like you need to trace back to the injector power supply to see where it is missing. You mean both pins at the injector should have +12V with Ignition On ? So it's clearly a wiring issue, I just was wondering why the "Injector Pulse & Duty Cycle" gauges are still on Injector Test.. Thank You Quote Link to comment Share on other sites More sharing options...
Adamw Posted November 8, 2021 Report Share Posted November 8, 2021 1 hour ago, Kam said: I just was wondering why the "Injector Pulse & Duty Cycle" gauges are still on Injector Test.. Not sure what the question is here. The inj status runtime will not show anything when you are running a test. The test bypasses all normal functionality. Kam 1 Quote Link to comment Share on other sites More sharing options...
Kam Posted November 8, 2021 Author Report Share Posted November 8, 2021 7 minutes ago, Adamw said: Not sure what the question is here. The inj status runtime will not show anything when you are running a test. The test bypasses all normal functionality. Shouldn't the "injector pulse width" and "duty cycle" numbers go up from 0 when in injector test mode ? Quote Link to comment Share on other sites More sharing options...
Adamw Posted November 8, 2021 Report Share Posted November 8, 2021 No, you are only testing one output at a time and bypassing all of the internal calculations in test mode. Those runtimes show what is being commanded to all injections from the fuel calculation. Kam 1 Quote Link to comment Share on other sites More sharing options...
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