7.10 CAN bus / Testmodes 7 ADDITIONAL ITEMS: BEYOND BASIC FUEL AND IGNITION CONTROL
• Maximum Fluctuation - maximum fluctuation during operation
The fluctuation settings are key to detecting a failed O
2
sensor. Many wideband controllers will get "stuck" if the
sensor fails, although appearing to show a valid AFR reading. Combined with closed-loop EGO or autotuning, this
can be troublesome without this detection scheme. Other controllers allow an “out of range” voltage output - match
the min/max ADC readings to capture this.
• Sync-loss check - Enable or disable checking of sync losses to troubleshoot crank or cam sensors.
• No. sync losses allowed - how many recorded losses of tach-in synchronization are allowed before setting
the CEL. (During normal operation, you may see one or two sync-losses during startup. Beyond that, there
is a problem with your RPM input wiring or configuration.)
• EGT sensor check - Enable or disable checking of the EGT sensor inputs.
• Minimum EGT - minimum valid EGT while engine is running
• Maximum EGT - maximum valid EGT while engine is running
• Minimum Fluctuation - minimum fluctuation during smooth running
• Maximum Fluctuation - maximum fluctuation during operation ()
The exhaust gas temperatures are not checked immediately after startup, so the minimum temperature can be set
to 200C to detect a dead cylinder or faulty sensor. The maximum will depend on your engine. N/A could be around
900C, boosted perhaps 1000C.
• Flex sensor check - Enable or disable checking of the Flex sensor input. (An error condition will be triggered
if the frequency on the flex input is outside of the set range.)
• status5 input - Specifies which sensor details are logged in status5 in the data log fields.
• status5 shows - If set the fluctuation, the value of status5 is the fluctuation number the code calculates
and compares to the minimum or maximum for each chosen sensor. e.g. Set this to MAP and then enable
’status5’ on your dash or view in a datalog. Allow the engine to idle and observe the lowest number. You can
then set the MAP minimum fluctuation to some value LOWER than this number. If the MAP input becomes
too stable (e.g. the hose falls off), then the alarm will be raised. If set to ADC counts, this shows the raw
analog to digital conversion reading of the sensor.
7.10.11.1 Check Engine codes The Check Engine light can be set to flash codes. These codes also show up
as CELStatus in the data logs. The codes are as follows:
• 2: MAP sensor fault
• 3: MAT sensor fault
• 4: CLT sensor fault
• 5: TPS fault
• 6: Battery voltage fault
• 7: O
2
sensor fault
• 8: Loss of sync (crank or cam sensor)
• 9: EGT sensor fault
• 10: Flex fuel sensor fault
• 11: MAF sensor fault
• 12: Knock sensor fault
• 13: Cam sensor fault, engine still has sync but is running in semi-sequential
AMP EFI MS3Pro manual version 1.202, firmware 1.5.0, 4/21/2017 Page 269
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