Inspection Procedure

CHECK THAT MIL IS ILLUMINATED

Perform troubleshooting in accordance with the chart below.

Result

RESULT CHART

MIL Condition	Proceed to
MIL remains ON	A
MIL does not illuminate	B

B: Go to step 4

A: Go to next step

CHECK WHETHER MIL TURNS OFF
1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON.
3. Turn the Techstream ON.
4. Check whether any DTCs have been stored (See DTC CHECK/CLEAR ). Note them down if necessary.
5. Clear DTCs (See DTC CHECK/CLEAR ).
6. Check if the MIL turns OFF.
  OK:
  
  MIL should turn off.
  
  OK: REPAIR CIRCUITS INDICATED BY OUTPUT DTCS
  
  NG: Go to next step
CHECK HARNESS AND CONNECTOR (CHECK FOR SHORT IN WIRE HARNESS)
1. Disconnect the ECM connector.
2. Turn the ignition switch to ON.
3. Check that the MIL is not illuminated.
  OK:
  
  MIL is not illuminated.
4. Reconnect the ECM connector.
  OK: REPLACE ECM (See REMOVAL )
  
  Fig 1: Identifying ECM Connector
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  NG: CHECK AND REPLACE HARNESS AND CONNECTOR
CHECK THAT MIL IS ILLUMINATED
1. Check if the MIL is illuminated when the ignition switch is turned to ON.
  OK:
  
  MIL should be illuminated.
  
  OK: END
  
  NG: Go to next step

CHECK THAT ENGINE STARTS

Turn the ignition switch to ON

Start the engine.

Result

RESULT CHART

Result	Proceed To
Engine starts	A
Engine does not start*	B
HINT: *: The Techstream cannot communicate with the ECM.

B: GO TO VC OUTPUT CIRCUIT

A: Go to next step

INSPECT COMBINATION METER ASSEMBLY (MIL CIRCUIT)
1. See the combination meter troubleshooting procedure (See HOW TO PROCEED WITH TROUBLESHOOTING ).
  NG: REPAIR OR REPLACE BULB OR COMBINATION METER ASSEMBLY
  
  OK: CHECK AND REPLACE HARNESS AND CONNECTOR (COMBINATION METER - ECM)