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MIL Circuit Troubleshooting
1 . Turn the ignition switch ON { ll), and watch the
M a l f u n c t i o n I n d i c a t o r L a m p ( M l L ) .
Does the MIL come on and stay on?
YES lf the MIL always come on and stays on, go
to step 21. But if the MIL sometimes works
normally, first check for these problems.l
. An intermittent short in the wire between the
E C M ( A 1 0 ) a n d t h e d a t a l i n k c o n n e c t o r { D L C ) .
. An intermittent short in the wire between the
E C M { A 1 8 ) a n d t h e g a u g e a s s e m b l y .
N O l f t h e M l L i s a l w a y s o f f . g o t o s t e p 2 . B u t i f t h e
MIL sometimes works normally, first check for
these problems.l
. A l o o s e N o . 5 I N S T R U M E N T L I G H T B A C K U P
LIGHT (7.5A) fuse in the under-dash fuse/relay
box,
. A l o o s e A C G S ( 1 5 A ) f u s e i n t h e u n d e r - h o o d
fuse/relay box.
. A l o o s e N o . 2 F U E L P U M P S R S ( 1 5 A ) f u s e i n t h e
under-dash fuse/relay box.
. A poor connection at ECM terminal 418.
. An intermittent open in the GRN/ORN wire
between the ECM (A18) and the gauge assembly.
. An intermittent short in the wire between the
ECM (C19) and the MAP sensor.
. An intermittent short in the wire between the
ECM (C28) and TP sensor, vehicle speed sensor
(VSS), air pump electric current sensor, or fuel
tank pressure (FTP) sensor.
. P G M - F l m a i n r e l a y .
T u r n t h e i g n i t i o n s w i t c h O F F a n d t h e n O N ( l l ) a g a i n .
ls the Iow oil ptessure light on?
YES -"Go to step 3.
NO Check for these problems.l
. A b l o w n N o . 5 I N S T R U M E N T L I G H T B A C K U P
LIGHT (7.5A)fuse in the under-dash fuse/relay
box.
. A short or open in the wire between No. 5
I N S T R U I \ 4 E N T
L I G H T B A C K U P L I G H T ( 7 . 5 A } f u s e
a n d t h e g a u g e a s s e m b l y .
3. Try to stan the engine.
n ^ a .
r h a a n d i h a
< t ^ r l ?
YES - Go to step 4.
NO Go to step 7.
4. Turn the ignition switch OFF.
5. Connect Eclvl connector terminalAlS to body
ground with a jumper wire.
ECM CONNECTOR A {32P}
l
2
3
4
6
I
10
12 13
t5
1 7 16
m
21
24
E 26 27
+
29
30
32
I MIL IGRN/ONNI
JUMPER WIRE I
Wire side of female terminals
Turn the ignition switch ON (ll).
ls the MIL on?
YES Substitute a known-good ECM and recheck
{see page 11-5). lf the symptom/indication goes
away, replace the original ECM.I
NO Check for an open in the wires between the
ECM {A18) and the gauge assembly. Also check for
a b l o w n M I L b u l b . l
(cont'd )
1 1 - 8 1
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Table of Contents
Troubleshooting
