Editor: Jan Vandenbrande
From: dilmore@cray.com (Robert J. Dilmore) Some edits by Jan and Andy Gajewski
Ok fellow techo-nerds here it is:
Multi - function indicator test
Perform MFI check mode and measuring mode test before doing any repairs
The following works on Passats, G60s, and probable other cars as well.
Check mode test verifies MFI is operating with the correct base
vehicle information
a. set MFI memory switch to position 1
b. switch ignition ON
c. press and hold MFI select button
d. switch ignition OFF, then back ON
e. release mode select button
(engine MAP code is displayed)
f. press and release mode select button to advance to next mode
(country code should be displayed)
g. continue pressing and releasing mode select button to advance
sequentially from mode to mode.
<<re:info given by MFI (or MFA) in diagnostic modes>>
According to my Bently book, the info given in "Check mode test functions"
(MFA switch to position 1, ignition on, press and hold mode select button in,
ignition off, then back on) is as follow (up to August, 1990, pp 91.10-91.11):
Function Times mode pressed Mode Indicated Value displayed
Engine Map code 0 -- 018
Country code 1 clock 4 (USA)
1 (Canada)
Speedo drive ratio 2 mpg or L/100km 955 (USA)
950 (Canada)
Upper rpm limit 3 miles or km 7418
Lower rpm limit 4 mph or km/h 1175
Decelleration fuel
shut-off pressure(mbar) 5 oil temp. 57
Segment test 6 -- all segments on
For "Measuring mode test functions" (switch on "2", same setup):
Function Times mode pressed Mode/symbol inciated
Test sum of programmed bytes 0 -- Intake manifold vacum (mbar) 1 clock Engine rpm 2 mph or km/h Momentary fuel consuption 3 mpg or L/100 km Signal from speed sensor 4 miles or km Oil temperature (degrees F or C) 5 oil temp Ambient(outside) temp (degrees F or C) 6 air temp
The differences from above for Aug. 1990 thru 1992 model year:
Engine map code-- 026 (G60) or 039 (VR6) Speedo drive ratio--6160 (USA) or 3800 (Canada) Check mode test function "5" is "Overrun cut-off vacuum (mbar)"-- 320(G60) or 220 (VR6)
The 1993 model year and after documentation doesn't seem to list the two sets of values, but refers to a procedure like the above but using the odometer reset button instead which then lists the following:
Function Function Meaning
number displayed
1 Distance pulse number 3735(All countries except USA and G. Britain
6010--Great Britain and USA
2 Country code 1(All but USA & GB); 2(G.B); 3(U.S.A.)
3 Speedometer/Tach not required for troubleshooting; used
for production only
4 No. of cylinders 6
5 Segment test All LCD segments selected
6 Pulse from speedometer 4 pulses counter per 1 wheel revolution
vehicle speed sensor
7 Engine speed (rpm)
8 Program version sames as "3" above
Intake Manifold or Charger Boost Pressure conversion Table:
MFA Readout Motometer/mbar in. Hg 15 200 23.7 55 400 17.8 90 600 11.9 127 800 5.9 148 1000 0 172 1200 2.9 psi 192 1400 5.8 psi 211 1600 8.7 psi 228 1800 11.6 psi 242 2000 14.5 psi 255 2200 17.4 psi
FUNCTION MODE INDICATED VALUE DISPLAYED
Engine MAP code - 013
Country code clock 1
speedometer drive ratio L/100km 920
Upper RPM limit* km 7418
Lower RPM limit km/h 1175
Deceleration fuel shutoff oil temp. **
Segment test - All segments light up
*= The displayed numerical value must match the chart, it is NOT an
indication of the upper and lower overrun fuel cutoff rpm.
**= The displayed numerical value has no importance for the check. MFI
is Ok if any value is displayed.
FUNCTION MODE INDICATED VALUE DISPLAYED Engine MAP code - 026 Country code clock 4 speedometer drive ratio mpg 955 Upper RPM limit* miles 7418 Lower RPM limit mph 1175 Deceleration fuel shutoff oil temp. ** (56) Segment test - All segments light up
FUNCTION MODE INDICATED VALUE DISPLAYED Engine MAP code - 039 Country code clock 4 speedometer drive ratio? mpg 6010 ? Upper RPM limit* miles 7418 Lower RPM limit mph 1175 Deceleration fuel shutoff oil temp. ** (220) Segment test - All segments light up ? ? 13 ? ? 0.08
FUNCTION/DISPLAY mode/symbol displayed
Test sum of programmed bytes * 624
Intake manifold (mbar)** Varies: 44-160
Engine RPM *** 780 idle, varies
Momentary fuel consumption 0.0 & up
Signal from speed sensor **** Varies 7547
Oil temperture (c) Varies
Ambient temperature Varies
FUNCTION/DISPLAY mode/symbol displayed
? 7558
Test sum of programmed bytes * C10
Intake manifold (mbar)** Varies: 245-750
Engine RPM *** 666 idle, varies
Momentary fuel consumption 0.0 & up
Signal from speed sensor **** Varies 1112
Oil temperture (c) Varies
Ambient temperature Varies
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