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1993 B2200 & B2600i Mass Air Flow (MAF) Diagnostic Test

   
Idle Switch

1) Disconnect idle switch electrical connector. See Fig. 28. Check continuity between switch and ground. Continuity should be present with throttle valve fully closed. Continuity should not exist with throttle valve open.

2) If continuity is not as specified, check wiring harness for open or short circuits. Replace idle switch and throttle body as an assembly if wiring harness is okay.

Figure 28