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Subsection 01 (ELECTRONIC FUEL INJECTION (EFI))
After a problem has been solved, be sure to clear
the fault(s) in the ECM using the B.U.D.S. soft-
ware.
WARNING
Electrical actuators and electronic modules
may be powered up as soon as the ignition
switch is set to ON and emergency engine
stop switch is set to RUN. Always disconnect
the battery prior to disconnecting any elec-
trical or electronic parts.
Never use a battery charger to temporarily substi-
tute the battery as it may cause the ECM to func-
tion erratically, or not at all.
Check related-circuit fuse solidity and condition
with an ohmmeter. A visual inspection could lead
to a false diagnosis.
Electrical Related Problems
It is important to check the following in the elec-
trical system:
– Battery voltage
– Fuses
– Ground connections
– Wiring and connectors.
Ensure that all electronic components are genuine
OEM. Any modification to the wiring harness may
lead to poor system operation or generate fault
codes.
Electrical Connections
Pay particular attention to ensure that terminals
and pins are not out of their connectors, corroded,
or out of shape.
When probing terminals, pay attention not to de-
form the terminals as this could cause a loose or
intermittent connection that would be difficult to
troubleshoot.
PROCEDURES
ENGINE CONTROL MODULE
(ECM)
As a first troubleshooting step, always check for
applicable fault codes using B.U.D.S. software.
Quick Test to Validate ECM Operation
Turn ignition key to ON.
Set emergency engine stop switch to RUN.
4
NOTE: This wakes up the ECM, which then turns
on the following. If the following do not turn on,
check ECM fuse (PF1 (F5 and F8)).
QUICK INDICATION THAT ECM IS FUNCTIONING
(assuming the observed component is
in good working order)
Multifunction gauge turns ON.
Fuel pump turns on for approx. 5 seconds.
Rear lights turn on.
Headlamps turn on (ignition key on with lights
position).
ECM Access
Refer to
BODY
and remove the LH panel.
vmr2012-022-002_a
LH PANEL REMOVED
1. ECM location
ECM Connector
There is one connector connected to the ECM. It
links:
– Engine harness
– Vehicle system control harness.
For connector information, cleaning and probing,
WIRING HARNESS AND CONNECTORS
refer to
subsection.
vmr2016-423
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Table of Contents
Troubleshooting
