Injection stage HELP

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Joined: Tue Mar 24, 2020 9:58 am

Injection stage HELP

Postby Titobt87 » Tue Mar 24, 2020 10:08 am

Hi, I can't seem to figure out why I keep tripping the following DTC's

P1690 Injection Stage 1 90% Duty Cycle exceeded
P1691 Injection Stage 2 90% Duty Cycle exceeded

I have FD RX7 Large street ported 13b rew (PINNED)
    Stock lower and upper intake
    CJ Motorsport Rails and billet fuel pump hanger
    GM FLEX FUEL sensor
    ID1700 Primary and 2200 Secondary
    -8an Line feeding the rails and -6an return
    Two AEM 400lph pumps, (Regarding the pumps I have the second pump staged at 5 psi.)
    Using the on-board pressure sensor (manifold)
    BorgWarner S364.5 SXE 1.00 AR
    Greddy turbo manifold
    Tial WG 44MM (10psi spring), Tial BOV 44
    ign-1a smart coils

All my mods. Could it be my primary injectors are too large causing this to happen. I also was not sure if the Injection system stage 1 and 2 firing angle BTDC had anything to do with it......

I am logging injection stage 1 and 2 duty cycle as well out the injector output duty cycle and do not see 90% in any of the logs. Should I disable the feature in the injector diagnostics?

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Haltech Staff
Posts: 3304
Joined: Tue Feb 07, 2012 12:45 pm
Location: Sydney, Australia

Re: Injection stage HELP

Postby HaltechMatthew » Tue Mar 24, 2020 3:24 pm

The error sometimes comes up after an update, or on older firmware versions. If you are sure it is not hitting 90% then yes you can remove the diagnostics.

Posts: 2
Joined: Tue Mar 24, 2020 9:58 am

Re: Injection stage HELP

Postby Titobt87 » Thu Mar 26, 2020 3:15 am

I figured out the issue. I had the fuel pressure type set to constant instead of map reference under setup and fuel settings. That was my mistake. But thank you for the suggestion.

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