Troubleshooting Quick Reference     | |
Go To The Detected Diagnostics Section For Troubleshooting     | |
Action Alarm     | CID 0271 Procedure     |
CAT Data Link     | CID 0248 Procedure     |
+8 DCV Sensor Supply     | CID 0263 Procedure     |
Gauges     | CID's 0096, 0100, 0102, 0110, 0172, 0175, 0263, 0460, 0821, 0827, 0828 Procedures     |
Go To The Undetected Diagnostics Section For Troubleshooting     | |
Alert Indicator     | Alert Indicator ALWAYS Flashes Procedure     |
Alert Indicator     | Alert Indicator NEVER Flashes Procedure     |
LH/RH Switch     | LH/RH Switch Doesn't Toggle     |
SCROLL Switch     | Scroll Switch Doesn't Toggle     |
SCROLL Switch     | Scroll Switch Continually Toggles     |
CLEAR/MODE Switch     | CLEAR/MODE Switch doesn't clear logged Diagnostic Codes and Tattletale values     |
CLEAR/MODE Switch     | CLEAR/MODE Switch automatically clears logged diagnostic codes and tattletale values     |
Alarm Silence Switch     | Alarm Silence Switch doesn't silence the Alarm     |
Alarm Silence Switch     | Alarm Silence Switch continually silences the Alarm     |
Troubleshooting the Caterpillar Monitoring System requires additional information from the Engine Service Manual.
The Electronic Troubleshooting Guide, the Parts Manual, and the Operation And Maintenance Manual are required support material.
Perform resistance measurements at the connectors to locate harness problems. At component connectors, always check the ground circuit. Less than five ohms of resistance is required between the ground contacts of the connector and battery ground. Excessive ground resistance, greater than five ohms, can cause incorrect diagnosing of problems.
During troubleshooting, inspect all component connections and harness connections before any component is replaced. If these connections are not clean and tight, they can cause electrical problems, either permanent or intermittent. Check that the wires are pushed into the connectors all the way. Do a connector pull test or a wire pull test to confirm that the wire contact is snapped into place. Make sure the connections are tight before other tests are made.
Problems with one electrical component can cause problems with other electrical components. Always attempt to find and correct the cause of electrical system problems before replacing a component.