Engine Controls - System & Component Testing - 6.5L: Introduction
Before testing separate components or systems, perform procedures in the BASIC TESTING - 6.5L DIESEL article. Since many computer-controlled and monitored components set a trouble code if they malfunction, also perform procedures in the TESTS W/CODES - 6.5L article.
NOTE:
Testing individual components does not isolate shorts or opens. Perform all voltage tests with a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance, unless stated otherwise in test procedure. Use ohmmeter and refer to the WIRING DIAGRAMS
article to isolate wiring harness shorts or opens.
The following table provides the location of commonly used diagnostic information.
GENERAL MOTORS REFERENCE
| System Or Component | Diagnostic Information Location | ||
|---|---|---|---|
| Malfunction Indicator Light (MIL) | See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK in BASIC TESTING - 6.5L DIESEL article | ||
| DLC & MIL On Steady | See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK in BASIC TESTING - 6.5L DIESEL article | ||
| No Scan Tool Data | See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK in BASIC TESTING - 6.5L DIESEL article | ||
| No-Start Diagnosis | See appropriate NO-START - ENGINE CRANKS OKAY in BASIC TESTING - 6.5L DIESEL article | ||
| Injector Circuit Diagnosis | See BASIC FUEL SYSTEM CHECKS in BASIC TESTING - 6.5L DIESEL article | ||
| Fuel Pump Relay | See MODULES, MOTORS, RELAYS & SOLENOIDS | ||
| Fuel System Diagnosis | See appropriate BASIC FUEL SYSTEM CHECKS in BASIC TESTING - 6.5L DIESEL article | ||
| Injector Balance Test | See FUEL SYSTEM | ||
| MAP Sensor | See ENGINE SENSORS & SWITCHES | ||
| Transmission Range Switch | See ENGINE SENSORS & SWITCHES | ||
| Ignition Control Circuit | See IGNITION SYSTEM | ||
| Knock Sensor Check | See IGNITION SYSTEM | ||
| EGR System | See EMISSION SYSTEMS & SUB-SYSTEMS | ||
| Torque Converter Clutch | See MISCELLANEOUS PCM CONTROLS | ||
| Manual Transmission Shift Lights | See MISCELLANEOUS PCM CONTROLS | ||
| A/C Clutch Control | (1) See MISCELLANEOUS PCM CONTROLS | ||
| Electric Cooling Fan Control | (1) See MISCELLANEOUS PCM CONTROLS | ||
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