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Engine Control Module (ECM)
The Malfunction Indicator Lamp
(MIL) never comes on (even for
two seconds) after ignition is
turned ON (II).
Turn the ignition switch ON (II).
Is the low oil pressure light on?
Try to start the engine.
Does the engine start?
Check for an open in the wire or
bulb:
1. Turn the ignition switch OFF.
2. Connect the ECM connector
terminal A7 to body ground
with a jumper wire.
3. Turn the ignition switch ON (II).
Is the MIL on?
Substitute a known-good ECM,
and recheck (see page
11-39
immobilizer information). If symp-
tom/indication goes away, replace
the original ECM.
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NOTE: If this symptom is intermittent, check for a loose No. 5 BACK-UP LIGHTS, ALTERNATOR,
TURN SIGNALS (15 A) fuse in the under-dash fuse/relay box, a poor connection at ECM terminal
A7, or an intermittent open in the BLU wire between the ECM (A7) and the gauge assembly.
— Repair short in the wire
between No. 5 BACK-UP
LIGHTS, ALTERNATOR, TURN
SIGNALS (15 A) fuse and
gauge assembly.
— Replace No. 5 BACK-UP
LIGHTS, ALTERNATOR, TURN
SIGNALS (15 A) fuse.
Check for an open in the wires
(PG lines):
1. Turn the ignition switch ON (II).
2. Measure voltage between
body ground and ECM con-
nector terminals A12 and A25
individually.
Is there less than 1.0 V?
Substitute a known-good ECM
and recheck (see page
immobilizer information). If symp-
tom/indication goes away, replace
the original ECM.
— Repair open in the wires
between ECM (A7) and gauge
assembly.
— Replace the MIL bulb.
for
Repair open in the wire(s)
between ECM and G101 (located
at intake manifold) that had
more than 1.0V.
11-39
for
(cont'd)
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