Haltech F9A - Manual (Page 67)

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Engine Data Page Displays Unusual Readings
If the air temperature sensor, or coolant temperature sensor is showing a FAULT condition
then the sensors are either not operating correctly or are disconnected. Using the wiring
diagram of the Haltech F9 Loom check that the sensor wires are not damaged. If the wiring is
OK then contact your Haltech dealer regarding replacement of faulty sensor.
If the Throttle Position Sensor is showing a fault condition then re-calibrate the throttle sensor
and check the wiring
If the Manifold Absolute Pressure Sensor does not read near atmospheric pressure with the
engine off, or if it shows a fault condition, then check that the sensor is connected correctly.
Check that you have the correct model sensor and that the Identification page information has
been set correctly.
If the Engine Speed reading is erratic, the trigger is most likely picking up ignition noise from
incorrect plugs or leads, electrical noise from cooling fans, starter motor, alternator or other
electrical devices in the vehicle.
If the Engine Speed is steady but wrong, check that the Identification page contains the
correct information regarding number of cylinders.
If engine parameters are all showing unusual variation, make sure that the ECU is grounded
properly. Also check the engine and chassis grounds to the battery.
A.3 Starting problems
Fuel Pump doesn't prime when ignition switched on
The Haltech F9 will attempt to run the Fuel pump for about 2 seconds just after the ignition is
switched on. The fuel pump relay should be heard clicking in and out with the fuel pump. If
the relay clicks but the fuel pump doesn't work then check the wiring of the fuel pump and the
20A fuse in the fuse block.
Engine makes no attempt to start
Check the following:
• ECU is operating (will communicate Online) during cranking
• Battery voltage and connections
• Fuel Pump runs
• Injector fuse is OK and injectors fire
• Ignition system is operating properly and spark is available
If the engine is flooding, reduce the bars in the fuel map that are being used during cranking
in the fuel map, the coolant correction map and the cold prime map.
If the engine is not receiving enough fuel and increasing those bars does not help, check that
fuel pressure is available and that the injectors operate properly (are cleaned and flow-tested).
A.4 Idling Problems