Haltech IG5 - Manual (Page 64)

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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 IG5 Loom at the back of this manual 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. Make sure the Multitooth trigger type is not
selected unless the engine has a multitooth wheel. If using a multitooth trigger, make sure the
number of teeth is correctly set for the number of teeth per cam revolution.
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
Engine makes no attempt to start
Check the following:
• ECU is operating (will communicate Online) during cranking
• Battery voltage and connections
• Ignition system is operating properly and spark is available
• Ignition timing is correct
A.4 Idling Problems
If the engine will not idle when cold but will when the engine is warm then the coolant
correction map needs to be adjusted.
Check the ignition timing at idle and adjust if necessary.