DTC Test, Checking System For Diagnostic Trouble Codes

NOTE: Ensure battery is fully charged before proceeding with test.

Attempt to start engine. Crank engine for up to 10 seconds (if necessary). Diagnostic Trouble Codes (DTCs) may be retrieved using scan tool or Malfunction Indicator Light (MIL) on instrument panel.
If using MIL on instrument panel to check for DTCs, see RETRIEVING DTCS under SELF-DIAGNOSTIC SYSTEM for proper procedure. Read DTC code flashed by the MIL.
If using scan tool to check for DTCs, connect scan tool to Data Link Connector (DLC). Using scan tool manufacturer's instructions, read DTC message and code.
If scan tool displays NO RESPONSE, go to TEST NS-6A in appropriate BASIC TESTING article in ENGINE PERFORMANCE section. If scan tool will not power up, check for loose cable connections or bad cable. If cable connections and cable are okay, check voltage at cavity No. 16 (Pink wire) on DLC. Voltage should be at least 11 volts. If voltage is not as specified, check wiring circuit and necessary fuses. See appropriate wiring diagram in WIRING DIAGRAMS.
If scan tool displays an error message, (i.e., USER-REQUESTED COLD BOOT or USER-REQUESTED WARM BOOT), follow scan tool manufacturer's instructions. If scan tool displays a BUS failure (i.e., SHORT TO BATTERY), this indicates either a scan tool failure or BUS failure. To diagnose and correct BUS failures, see appropriate VEHICLE COMMUNICATIONS article in ACCESSORIES & EQUIPMENT.
If DTCs are displayed, see DTC MESSAGES & CODES table and perform appropriate test(s). If no DTCs are displayed, go to TESTCH-1A.

DTC MESSAGES & CODES

Scan Tool Display		Test No.
BATTERY TEMP. SENSOR
VOLTS OUT OF LIMIT		TC-153A, B & C
CHARGING SYSTEM VOLTAGE HIGH		TC-6A & B
CHARGING SYSTEM VOLTAGE LOW		TC-5A
GENERATOR FIELD NOT SWITCHING PROPERLY		TC-11A