Inspection Procedure

WARNING: This page is about a different car, the 2004 Lexus LS 430. However, it is still accessible from the selected car via links, so may be relevant.

INSPECT AFS ECU
1. Measure the voltage according to the value (s) in the figure Fig 1 below.
Standard:

Fig 1: Voltage Reference Chart
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1. NG: Go to step 2
  
  Fig 2: Inspecting AFS ECU
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2. OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE (SEE PROBLEM SYMPTOMS TABLE )
CHECK HARNESS AND CONNECTOR (GROUND CIRCUIT)
1. Disconnect the A39 connector from AFS ECU.
2. Measure the resistance according to the value (s) in the figure Fig 3 below.
Standard:

Fig 3: Resistance Reference Chart
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1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (GROUND CIRCUIT)
  
  Fig 4: Checking Harness And Connector (Ground Circuit)
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2. OK: REPAIR OR REPLACE HARNESS OR CONNECTOR (IGNITION SWITCH CIRCUIT)