Techtom MDM-100

Screen Display	Description	Units
SPD	Speed	mph or km/h
RPM	Engine RPM	RPM
AFM1, AFM2	Air Flow Meter voltage	volts
INJ1, INJ2	Injector Opening Time	milliseconds
IGN	Ignition Timing	degrees
WTEMP	Water Temp	⁰C or ⁰F
ITEMP	Intake Air Temp	⁰C or ⁰F
BATT	Battery Voltage	volts
THP	Throttle Position Sensor	volts
O2S-1, O2S-2	O₂ Sensor Voltage	volts
O2-1, O2-2	O₂ Sensor Condition	Lean or Rich
IDL-SW	Idle Switch	On or Off
NTL-SW	Neutral Switch	On or Off
POWERST-SW	Power Steering Switch	On or Off
AIRCON-SW	A/C Switch	On or Off
BSCV	Boost Solenoid Control Valve	On or Off
AAC	Auxilliary Air Control Valve	percentage

Item	Condition	Reading
Air Flow Meter	Engine warm, idling, A/C off, in Neutral, no load	idle 0.9 - 1.4v 2000rpm 1.4-1.8v
RPM	Engine running	Compare with tacho - should be very similar
Water temp	Engine warm	more than 70^oC
O₂ Sensor	Engine warm at 2000 rpm	0-0.3 - 0.6-1.0v
O₂ Sensor	Engine warm at 2000 rpm	Lean ↔ Rich Changes more than 5 times in 10 seconds
Speed	Car moving	Compare with speedo - should be very similar
Battery voltage	Ignition on, engine stopped	11 - 14v
Throttle Position Sensor	Ignition on, engine stopped	Throttle closed 0.4 - 0.5 v Throttle fully open Approx. 4.0v
Idle Switch	Ignition on, engine stopped	Throttle valve idle: ON Throttle valve slightly open: OFF
A/C Switch	A/C Switch "ON" A/C Switch "OFF"	OFF ON
Neutral Switch	Ignition on	Gear lever in "P" or "N" - ON Except above - OFF
Power Steering switch	Engine warm, idling	Steering wheel neutral direction -OFF Except above: ON
Injector Pulse	Engine warm, idling, A/C off, in Neutral, no load	idle 1.8 - 2.5 msec 2000rpm 1.8 - 2.2 msec
Ignition timing	Engine warm, idling, A/C off, in Neutral, no load	idle 15⁰ BTDC 2000rpm more than 25⁰ BTDC
AAC valve	Engine warm, idling, A/C off, in Neutral, no load	idle 15-35% 2000 rpm -