No Engine Braking In 1st Gear Or Manual "1"

Check for poor engine performance. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. Retrieve and record DTCs. See QUICK TEST  under DIAGNOSIS & TESTING. Perform TEST A  and TEST D  under SYSTEM TESTS. Repair as necessary. Clear codes and perform TRANSAXLE DRIVE CYCLE TEST  under DIAGNOSIS & TESTING. Repeat QUICK TEST  and ensure DTCs are not present.