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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 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
PASSAT Readouts:
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.
1990 US G60 with AT Stage I Readouts [jan]:
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
1992 US Corrado SLC/VR6 Readouts [jan]:
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
1990 US G60 with AT Stage I Readouts:
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
1992 US SLC/VR6 Readouts:
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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