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Content .. 1927 1928 1929 1930 ..
Theory of Operation The brake switch signal must be active before the shift lever can be moved out of the park position. The Electronic • When Monitored: • Set Condition: Possible Causes ENGINE BRAKE DTCS PRESENT ABS DTCS PRESENT (B29) BRAKE SWITCH SIGNAL SHORT TO GROUND ELECTRONIC SHIFT MODULE (ESM) Always perform the NAG1 Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 21 - Diagnostic Test 1. ENGINE DTCS PRESENT With the scan tool, read Engine DTCs. Are there any Engine brake DTCs present? Yes >> Refer to Engine category and perform the appropriate symptom(s). (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING) Perform NAG1 TRANSMISSION VERIFICATION TEST. (Refer to 21 - TRANSMISSION/TRANSAXLE/ No >> Go To 2 2. ABS MODULE DTCS PRESENT With the scan tool, read ABS Module DTCs. Are there any ABS DTCs present? Yes >> Refer to the Brake category and perform the appropriate symptom(s). (Refer to 5 - BRAKES - DIAG- NOSIS AND TESTING) Perform NAG1 TRANSMISSION VERIFICATION TEST. (Refer to 21 - TRANSMISSION/TRANSAXLE/ No >> Go To 3 21 - 250 AUTOMATIC TRANSMISSION NAG1 - SHIFTER DIAGNOSTICS LX |