Test A: Scan Tool Does Not Communicate With Class 2 Device In Data Link Communications

Perform diagnostic system check. See DIAGNOSTIC SYSTEM CHECK under DIAGNOSIS & TESTING. After performing diagnostic system check, go to next step.
Turn ignition off. Install scan tool. Turn ignition on, with engine off. Attempt to establish communication with other modules on the class 2 serial data line, such as PCM. If scan tool communicates with any other modules on the class 2 serial data line, go to next step. If scan tool does not communicate with any other modules, diagnose data link system circuit. See WIRING DIAGRAMS .
Turn ignition off. Disconnect EBCM harness connector. Connect Universal Pinout Box (J 39700) using the Cable Adapter (J 39700-99) to EBCM harness connector only. Check voltage from pinout box battery supply circuit to a good ground. If voltage reading is within battery voltage, go to next step. If voltage reading is not within battery voltage, go to step 7 .
Check ignition positive voltage input circuit for EBCM. If voltage reading is about battery voltage, go to next step. If voltage reading is not within battery voltage, go to step 8 .
Check for open in module ground circuit. Repair as necessary. After repairs, go to step 20 . If circuit is okay, go to next step.
Check serial data line circuit for an open between EBCM connector and splice. See WIRING DIAGRAMS . Repair as necessary. After repairs, go to step 20 . If circuit is okay, go to step 15 .
Check fusible link (Gray) located near starter. If fusible link is okay, go to step 9 . If fusible link is okay, go to step 14 .
Check ABS /PCM fuse located in the instrument panel fuse block. If fuse is okay, go to step 10 . If fuse is open, go to step 13 .
Check voltage at fusible link (Gray) by probing between starter terminal and a good ground. If battery voltage is present, go to step 12 . If battery voltage is not present, go to step 17 .
Install fuses, if removed. Turn ignition on, with engine off. Check voltage at instrument panel fuse block by probing between fuse test terminals and a good ground. If battery voltage is present, go to next step. If battery voltage is not present, go to step 16 .
Repair open in ignition positive voltage circuit. After repairs, go to step 20 .
Repair open in battery positive voltage circuit. After repairs, go to step 20 .
Turn ignition on. Remove ABS/PCM fuse from instrument panel fuse block. Disconnect EBCM harness connector. Connect Universal Pinout Box (J 39700) using Cable Adapter (J 39700-99) to EBCM harness connector only. Check ignition voltage circuit for short to ground. Repair as necessary. After repairs, go to step 20 . If circuit is okay, go to step 15 .
Turn ignition off. Disconnect battery negative cable. Remove fusible link (Gray) from starter connection. Disconnect EBCM harness connector. Connect Universal Pinout Box (J 39700) using Cable Adapter (J 39700-99) to EBCM harness connector only. Check battery voltage circuit for short to ground. Repair as necessary. After repairs, go to step 20 . If circuit is okay, go to next step.
Check for poor connections at EBCM harness connector. Repair as necessary. After repairs, go to step 20 . If connections are okay, go to step 18 .
Check for poor connections at instrument panel harness connector. Repair as necessary. After repairs, go to step 20 . If connections are okay, go to step 19 .
Repair poor connection at starter terminal connector. After repairs, go to step 20 .
Replace EBCM. After replacing EBCM, go to step 20 .
Replace instrument panel. After replacing instrument panel, go to next step.
Using scan tool, clear DTCs. Recheck DTCs. If DTC resets, go to step 2 . If DTC does not reset, system is okay.