ENGINE AND EMISSION CONTROL SYSTEM
6E1-17
A-3 MALFUNCTION INDICATOR LAMP CIRCUIT CHECK
(MALFUNCTION INDICATOR LAMP DOES NOT FLASH OR JUST REMAINS ON EVEN WITH GROUND-
ING DIAGNOSIS SWITCH TERMINAL.)
1. Battery positive voltage
2. Blank
3. Ignition switch
4. Fuse
5. Malfunction indicator lamp
6. Monitor connector
7. ECM
8. Main relay
STEP
ACTION
YES
NO
1
MIL Circuit Check
1) Turn ignition switch OFF and disconnect connec-
tors from ECM.
Does MIL turn ON at ignition switch ON?
“V/Y” circuit shorted
to ground.
Go to Step 2.
2
ECM Connection Check
1) Turn ignition switch OFF.
Is connector (E34-8 connection) connected to ECM
properly?
Go to Step 3.
Poor connector connection.
3
Diag. Switch Terminal Circuit Check
1) Connect connectors to ECM.
2) Using service wire, ground E34-8 terminal with
connectors connected to ECM.
3) Turn ignition switch ON.
Does MIL flash?
“V/G” or “Bl/B” cir-
cuit open.
Substitute a known-good
ECM and recheck.
Fig. for STEP 3
1. ECM coupler connected
2. Body ground
3. Service wire