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P0571-BRAKE SWITCH 1 PERFORMANCE (CONTINUED) 4. (B16) BRAKE SWITCH NO.2 SIGNAL CIRCUIT SHORTED TO GROUND Measure the resistance between ground and the (B16) Brake Switch Is the resistance below 100 ohms? Yes >> Repair the short to ground in the (B16) Brake Switch No.2 Signal circuit. Perform the POWERTRAIN VERIFICATION TEST. (Refer No >> Go To 5 5. (Z904) GROUND CIRCUIT OPEN Measure the resistance between ground and the (Z904) Ground circuit Is the resistance below 5.0 ohms? Yes >> Go To 6 No >> Repair the open in the (Z904) Ground circuit. Perform the POWERTRAIN VERIFICATION TEST. (Refer 6. STOP LAMP SWITCH Measure the resistance between the (Z904) Ground circuit terminal and the (B15) Brake Switch No.1 Signal terminal Next, measure the resistance between the (F942) Fused Ignition Switch Output circuit terminal and the (B16) Brake Apply and release the Stop Lamp Switch while monitoring the ohmmeter. Does the resistance change from below 5.0 ohms to an open circuit for one or both of the measurements Yes >> Go To 7 No >> Replace the Stop Lamp Switch. Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) 9 - 616 ENGINE ELECTRICAL DIAGNOSTICS WK |