How To Use Check Engine Lamp For Fault Codes; Charging System Fault Codes; Alternator Fault Code Chart - Dodge D150 1990 Service Manual

8A - 18 BATTERY/STARTING/CHARGING SYSTEMS DIAGNOSTICS •
l e m . However, i n some cases, as a r e s u l t o f t h e de-
sign o f the d r i v e a b i l i t y test procedure, a f a u l t code
can be t h e reason for t h e problem. I t i s i m p o r t a n t
t h a t t h e test procedure be followed i n order t o under-
stand w h a t the f a u l t codes o f t h e on-board diagnostic
system are t r y i n g to t e l l .
HOW TO USE CHECK ENGINE LAMP FOR FAULT
CODES
To activate t h i s function cycle t h e i g n i t i o n s w i t c h
on-ofif-on-off-on w i t h i n five seconds a n d a n y f a u l t
stored i n the engine controller w i l l be displayed. T h e
Check Engine lamp w i l l display a f a u l t code b y flash-
i n g o n a n d off. There is a short pause between
flashes and a longer pause between d i g i t s . A l l codes
displayed are t w o d i g i t numbers w i t h a four second
pause between codes.
A n example o f a code is as follows:
(1) L a m p o n for t w o seconds, t h e n t u r n s off.
(2) L a m p flashes four (4) times pauses a n d t h e n
flashes once (1).
(3) L a m p pauses for four seconds, flashes four (4)
times, pauses a n d t h e n flashes seven (7) times.
The two codes are 4 1 and 47. A n y n u m b e r o f codes
can be displayed ( m a x i m u m o f 8 f a u l t s can be stored)
as l o n g as t h e y are i n memory. T h e l a m p w i l l flash
u n t i l a l l of t h e m ( i n c l u d i n g 55) are displayed (55 =
E n d o f test).
CHARGING SYSTEM FAULT CODES
See A l t e r n a t o r F a u l t Code C h a r t for f a u l t codes
w h i c h apply t o t h e c h a r g i n g system. Refer t o t h e
P o w e r t r a i n Diagnostic Procedures M a n u a l t o diag-
nose a n On-Board Diagnostic System, F a u l t Code.
ALTERNATOR FAULT CODE CHART
fault
Code Type
Check
Engine
Lamp
Grcuit
lift.
M n n ^ J
By the Logic
Module
When Put into Memory
Actuator
Test
Sensor
b a d
lest
41 Fault Yes
Alternator Field
Control
(Charging System)
All the time when
the ignition switch
is on.
If the field control fails to
switch properly or excessive
alt. field current detected.
Yes None
46 Fault Yes
Charging System
Voltage
All the time when
the engine is run-
ning.
If the battery sense voltage
is more than 1 volt above
the desired control voltage
for more than 20 seconds.
None Yes
47 Fault Yes
Charging System
Voltage
Engine rpm above
1,500 rpm
Battery voltage sense input below
desired charging voltage during
engine operation and no change
in voltage during internal SBEC
test performed on alternator field.
None
Yes
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