Honda Prelude 1993 Service Manual page 300

The Mallunction Indicator L6mP
(MlL) 3tays on or com63 on allo.
two soconoS.
Connect the service check con-
nector terminals with a jumper
wire {see page 11-42).
Turn the ignition switch ON.
Does the MIL indicate
any Diagnostic Trouble
code (DTc)?
Go to rslf-diagnoatic ptocodutos
lso6 pags 11401.
R€move the iumper wire from the
service check connoctor.
Turn the ignition switch OFF.
Try to start the engine.
Connect the test harness between
the ECM and conneclors {see
p a g e 1 1 - 4 5 ) .
Turn the ignition switch ON.
Measure voltage between D4 (+)
terminal and D21 l-) terminal.
Connect the service
check connector terma-
nals with a jumper ware.
ls there approx. 5V (A/T: 11 V)?
Bopair shorl to body ground in
BRN/ WHT wiro botwo€n tt|o ECM
{t}4}, lrsnsmission Control Mod-
ulo lTCMl, ABS contrcl unit or
4WS control unit and seryico
chock connoqtor.
Mgasure voltage be-
tween D4 (.t ) terminal
and D21 {-) terminal.
- Repair open in BRN/WHT wite
botwoon ECM (O4l and sorv-
ico chock connoctor.
- Repair op6n in BLU/WHT wite
botwoon sorvico check con-
noctor and ECM {O211.
ls there spprox. 5 V
( A / T : 1 1 V l ?
Remove and inspect the NO. 4
BACK UP (10 Altuse in the under-
dash fuse/relay box.
Remove the ,umper
wire from the service
check connector.
PGM-FI System
Troubleshooting Flowchart - Engine Control Module IECM)
NOTE: When there is no code stored, the MIL will stay
on if the service check connector is jumped.
o o o o o o o o o o o o o I o o o o o o o o m o o o o o o o o o o
o o o o o o o o o o o o o l o o o o o o o o
ls the fuse OK7
Y E S
{ T o p a g e 1 1 - 5 3 )
D 4 l + l
r _ S V ?
{A/T:
'NorE: After reDair, disconnect rhe service check con- lro
page 11-53)
nector iumper wire, test drive the car, and recheck the
MIL for code.
11-52