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10. Peak and Hold - External Injector Driver
Peak and Hold drivers are designed to control the current on low
impedance injectors and they are not needed when using high
impedance injectors.
The FuelTech Peak and Hold has 4 outputs and in the LS Wiring
Harness will run one injector per channel. There are 3 different versions
of Peak and Hold available to fire different injectors, according to the
resistance of the injector. The only differences between the versions
are the peak current and the hold current.
Considering one injector per channel application:
2A/0.5A – Bosch 1600cc, Ford Racing 1600cc
4A/1A – Siemens Deka 225lb/h, Precision 225lb/h
8A/2A – Precision 550lb/h, Billet Atomizer, Moran
11. Troubleshooting
Issue Solution
FT500 Unit doesn’t turn on
1. Check battery voltage
2. Check power and ground cables
3. Check Switched 12V cable
4. Check ECU harness cables
FT500 doesn’t read cranking
1. Check crank trigger and cam sync connections
2. Check sensor gap
3. Check diagnostic panel for RPM signal
FT500 reads RPM but engine
doesn’t start
1. Check if there is spark and injector pulse
2. Check fuel pressure
3. Check crank trigger alignment and TPS calibration
4. Check if outputs are activated and properly configured
5. Check the O2 sensor reading
Engine runs but doesn’t idle
1. Check TPS calibration
2. Check timing with a timing light
3. Check TPS idle table and adjustment
4. Check O2 sensor reading
Engine spits & sputters
1. Check O2 sensor reading
2. Check ignition calibration and firing order
ECU won’t communicate to PC
1. Ensure your software version is compatible with your FT500 firmware version
2. Check if read and write buttons get colored when FT500 is connected
12. FuelTech Latest Manuals and Software
You can access all updated manuals and software at the FuelTech website:
www.fueltech.net/manuals
www.fueltech.net/software
Some earlier Moran injectors require a 4A/1A driver. Contact FuelTech
tech support to confirm correct Peak and Hold drivers before
purchasing.
When using high impedance injectors without Peak and Hold drivers,
jumpers wires (sold separately, part number 2001000071) must be
connected to the Peak and Hold plugs in the harness. If the jumper
wires are not being used then the injectors won’t fire since there will
be no continuity between the FT500 and injectors.
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