Description & Operation

SWITCH MONITOR TEST uses PIDs to check operation of certain switches (and related circuits) that do not set DTCs.

1. 1) Perform Switch Monitor Test
   
   Turn ignition on. Using New Generation STAR (NGS) tester, select and enter the following data:
   • Select DIAGNOSTIC DATA LINK.
   • Select PCM-POWERTRAIN CTRL MODULE.
   • Select PID/DATA MONITOR & RECORD menu.
   • Select switches listed in SWITCH MONITOR TEST  table and check switches ON-OFF operation.

     Operate all switches listed, and compare scan tool PID reading to switch condition. If PID reading matches switch condition, go to next step. If PID reading does not match switch condition, perform appropriate SYSTEM TEST.

     SWITCH MONITOR TEST
     
     

     Switch & Condition		PID Reading	Go To
     Vehicle Start (VST) Signal
     Ignition On		OFF	Test A  , Step  1)
     Ignition Start		ON	Test A  , Step  1)
     Power Steering Pressure Switch (PSP SW)
     Engine Running, Steering In Neutral Position		OFF	Test FF  , Step  1)
     Engine Running, Steering Turned		ON	Test FF  , Step  1)
     A/C Switch (AC SW)
     Ignition On, A/C Off		OFF	Test KM  , Step  1)
     Ignition On, A/C On		ON	Test KM  , Step  1)
     Park/Neutral Position Signal (PNP)
     Ignition On, Gearshift Lever In "N" Or "P" Range		ON	(1)
     Ignition On, Gearshift Lever Not In "N" Or "P" Range		OFF	(1)
     A/C Relay (ACR)
     Engine Running, A/C Off		OFF	Test KM  , Step  1)
     Engine Running, A/C On		ON	Test KM  , Step  1)
     Cooling Fan Relay (Low) (LFAN)
     Engine Running, A/C Off		OFF	Test KF  , Step  1)
     Engine Running, A/C On		ON	Test KF  , Step  1)
     (1) Perform TEST D: TRANSMISSION RANGE SENSOR under DIAGNOSTIC TESTS in 4F20E DIAGNOSIS article in AUTOMATIC TRANSMISSIONS.

2. 2) Perform Intermittent Diagnostic Test
   
   Check for intermittent faults. Perform TEST Z  , step  1) under SYSTEM TESTS. Repair faults as necessary and retest system. If no faults are found, go to SYMPTOM DIAGNOSIS under SYMPTOMS in TROUBLE SHOOTING - NO CODES - VILLAGER article.