Checks
| Action
|
DEFINITION: The problem may or may not turn ON the malfunction
indicator lamp (MIL) or store a diagnostic trouble code (DTC).
|
Preliminary Checks
| Refer to
Symptoms - Engine Controls
.
|
Damaged Electrical Connections or Wiring
|
| • | Carefully reform all the connector terminals in the problem circuit
in order to ensure the proper contact tension. If necessary, replace
all the connector terminals in the problem circuit in order
to ensure the proper contact tension. Refer to
Connector Repairs
in Wiring Systems. |
| • | An intermittent may be caused by a poor connection, rubbed through
wire insulation, or a broken wire inside the insulation. |
|
Road Test
|
| • | If a visual and physical check does not locate the cause of the
problem, drive the vehicle with a DMM connected to a suspected circuit
or use a scan tool. |
| • | When the problem occurs, an abnormal voltage or scan reading indicates
the problem may be in that circuit. |
|
Intermittent
Components
| The following components can cause an intermittent:
| • | A defective relay, control module driven solenoid, or a switch
that can cause an electrical system interference--normally, the problem
will occur when the defective component is operating. |
| • | The improper installation of electrical devices, such as lights,
2-way radios, electric motors, and other devices. |
| • | Route the ignition control (IC) wires away from the spark plug
wires, the ignition system components, and the generator. The wire for the
engine ground from the control module to the ignition system
should be a good ground. |
| • | The ignition secondary voltage shorted to a ground |
| • | The malfunction indicator lamp (MIL) circuit or the diagnostic
test terminal intermittently shorted to a ground |
| • | The control module grounds |
|
