LS 600h V8-5.0L (2UR-FSE) Hybrid (2008)
Malfunction Indicator Lamp: Testing and Inspection
2UR-FSE ENGINE CONTROL SYSTEM: SFI SYSTEM: MIL Circuit
MIL Circuit
DESCRIPTION
The MIL (Malfunction Indicator Lamp) is used to indicate vehicle malfunction detections by the ECM. By turning the power switch ON (IG), power is
supplied to the MIL circuit, and the ECM provides the circuit ground which illuminates the MIL.
The MIL operation can be checked visually:
When the power switch is first turned ON (IG), the MIL should be illuminated and should then turn off. If the MIL remains illuminated or is not
illuminated, conduct the following troubleshooting procedure.
If the ECM detects trouble, the MIL illuminates. At this time, the ECM records a DTC in the memory.
WIRING DIAGRAM
INSPECTION PROCEDURE
PROCEDURE
1. CHECK THAT MIL IS ILLUMINATED
(a) Perform troubleshooting in accordance with the chart below.
Result
B -- CHECK THAT MIL IS ILLUMINATED
A -- Continue to next step.
2. CHECK IF MIL TURNS OFF
(a) Connect the intelligent tester or Techstream to the DLC3.
(b) Turn the power switch ON (IG) and turn the tester ON.
(c) Check if DTCs have been stored See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Reading and
Clearing Diagnostic Trouble Codes/DTC Check / Clear. If DTCs are present, write them down.
(d) Clear the DTCs See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Reading and Clearing Diagnostic
Trouble Codes/DTC Check / Clear.
(e) Check that the MIL turns off.
OK:
MIL turns off.
NG -- CHECK HARNESS AND CONNECTOR (CHECK FOR SHORT IN WIRE HARNESS)
OK -- REPAIR CIRCUITS INDICATED BY OUTPUT DTCS
3. CHECK HARNESS AND CONNECTOR (CHECK FOR SHORT IN WIRE HARNESS)