90-823225--1 10965E-60 - ELECTRONIC FUEL INJECTION (MULTI-PORT AND THROTTLE BODY)
Engine Cranks but Will Not Run (Continued)
Chart A-3 (3 of 4)
INJ/ECM
FUSE 10A
DIST. REFERENCE “HIGH”
BYPASS
DIST. REFERENCE “LOW”
IGNITION CONTROL
A
A
B
B
MULTI-PORT
THROTTLE BODY
INJECTORS
INJECTORS
TEST DESCRIPTION:
Number(s) below refer to circled number(s) on the
diagnostic chart.
1. Check for 12 volt supply to injectors. Due to the
injectors wired in parallel, there should be a light
ON on both terminals.
2. Check continuity of CKT 467 and CKT 468.
3. All checks made to this point would indicate that
the ECM is at fault. However, there is a possibility
of CKT 467 or CKT 468 being shorted to a voltage
source either in the engine harness or in the injec-
tor harness.
To test for this condition:
• Disconnect all injectors.
• Ignition ON.
• Probe CKT 467 and CKT 468 on the ECM
side of injector harness with a test light con-
nected to ground. (Test one injector harness
on each side of engine.) There should be no
light. If light is ON, repair short to voltage.
• If OK, check the resistance of the injectors.
Should be 12 ohms +
4.
• Check injector harness connector. Be sure
terminals are not backed out of connector
and contacting each other.
• If all OK, replace ECM.
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