Baja F4-2.5L SOHC (2003)
Cruise Control: Diagnostic Aids
Basic Procedures
1. GENERAL
The most important purpose of diagnostics is to determine which part is malfunctioning quickly, to save time and labor.
2. IDENTIFICATION OF TROUBLE SYMPTOM
Determine what the problem is based on the symptom.
3. PROBABLE CAUSE OF TROUBLE
Look at the wiring diagram and check the system's circuit. Then check the switch, relay, fuse, ground, etc.
4. LOCATION AND REPAIR OF TROUBLE
1. Using the diagnostics narrow down the causes.
2. If necessary, use a voltmeter, ohmmeter, etc.
3. Before replacing certain component parts (switch, relay, etc.), check the power supply, ground, for open wiring harness, poor connectors, etc.
If no problems are encountered, check the component parts.
5. CONFIRMATION OF SYSTEM OPERATION
After repairing, ensure that the system operates properly.
Basic Inspection
1. VOLTAGE MEASUREMENT
1. Using a voltmeter, connect the negative lead to a good ground point or negative battery terminal and the positive lead to the connector or
component terminal.
2. Contact the positive probe of the voltmeter on connector (A). The voltmeter will indicate a voltage.
3. Shift the positive probe to connector (B). The voltmeter will indicate no voltage.
4. With test set-up held as it is, turn switch ON. The voltmeter will indicate a voltage and, at the same time, the light will come on.
5. The circuit is in good order. If a problem such as a lamp failing to light occurs, use the procedures outlined above to track down the
malfunction.
2. CIRCUIT CONTINUITY CHECKS
1. Disconnect the battery terminal or connector so there is no voltage between the check points. Contact the two leads of an ohmmeter to each of
the check points.
If the circuit has diodes, reverse the two leads and check again.
2. Use an ohmmeter to check for diode continuity. When contacting the negative lead to the diode positive side and the positive lead to the
negative side, there should be continuity.
When contacting the two leads in reverse, there should be no continuity.
