Service manual

MAN 650314:D
32
Symptom Possible Problem Solution
-----------------------------------------------------------------------------------------------------------------------------------
The Check Engine The Engine Control Module Connect a bulb with one wire to
indicator stays on (ECM) needs to see the keyed power and the other to
all of the time. load of a light connected to it. the CHECK ENG terminal.
The Function switches The push-button switches are Momentary push-button or toggle
do not operate not connected to the control switches must be connected to
properly. box. the SW1 and SW2 terminals
as described in the manual.
The wrong type of switch is The switch terminal connected
being used. to the control box should
normally be open. When the
the switch is activated, the
terminal should make contact
to ground.
The display system starts SW2 terminal is constantly Disconnect or replace the
up in the demonstration connected to ground. SW2 switch.
mode and remains in it.
The clock doesn’t keep Constant power terminal is Ensure Constant Power terminal
time. losing power. has 12v even when key is off.
Display is too dark or light. Contrast need to be adjusted. See manual for contrast adjusting
instructions.
VHX Series Specifications
SUPPLY
Voltage Range(BAT) 8 to 22 V
Ignition > 8 V
INPUTS
Active High
Low Max Min High
High, Left, Right,
Gear, Wait, DIM
3.7 V 8.4 V
Active Low
Low Max Min High
SW1,SW2, Check 2.7 V 6.0 V
Brake, Cruise, 4 X 4 3.7 V 8.4 V
Tachometer
Setting Low Max High Min
Normal 3.0 V 7.6 V
Low-Volt 0.9 V 4.1 V
Speedometer
Square Wave Sin Wave
> 1.2 V
P-P
> 1.4 V
P-P
OUTPUT
WARN, SPD < 600 mA
Current Draw
IGN Off ≈ 0.3 mA
IGN On, LIGHT Off ≈ 101 mA
IGN On, LIGHT On ≈ 280 mA