Inspection Procedure

1. Perform troubleshooting in accordance with the table below.
   TROUBLESHOOTING REFERENCE
   
   

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

B:  Go to step  5

A: Go to next step 

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON.
3. Turn the Techstream ON.
4. Select the following menu items: Powertrain / Engine and ECT / Trouble Codes.
5. Check if any DTCs have been detected. Note down any DTCs.

   Result 

   RESULT REFERENCE
   
   

   Result	Proceed to
   No DTC detected	A
   Any DTCs detected	B

   HINT:

   Check for detected DTCs output from other ECUs which relates to the MIL.

B : REPAIR CIRCUITS INDICATED BY OUTPUT DTCS  (See DIAGNOSTIC TROUBLE CODE CHART )

A: Go to next step 

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.
Fig 1: Identifying ECM Connector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: Go to step 4 

OK : REPLACE ECM  (See REMOVAL  )

1. Disconnect the ECM connector.
2. Disconnect the combination meter connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard resistance (Check for short) 

   RESISTANCE SPECIFICATION - CHECK FOR SHORT
   
   

   Tester Connection	Condition	Specified Condition
   A36-24 (W) or C36-3 (combination meter) - Body ground	Always	10 kΩ or higher

4. Reconnect the ECM connector.
5. Reconnect the combination meter connector.
Fig 2: Identifying Combination Meter And ECM Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG : REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK : REPLACE COMBINATION METER ASSEMBLY  (See REMOVAL )

1. Check if the MIL is illuminated when the ignition switch is turned to ON.

   OK: 

   MIL should be illuminated. 

NG: Go to step 6 

OK : SYSTEM OK 

1. Turn the ignition switch to ON.
2. Start the engine.
   RESULT REFERENCE
   
   

   Result	Proceed To
   Engine starts	A
   Engine does not start*	B
   HINT: *: An intelligent tester or a Techstream cannot communicate with the ECM.

B:  Go TO VC OUTPUT CIRCUIT  .

A: Go to next step 

1. Disconnect the ECM connector.
2. Disconnect the combination meter connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard resistance (Check for open) 

   RESISTANCE SPECIFICATION - CHECK FOR OPEN
   
   

   Tester Connection	Condition	Specified Condition
   A36-24 (W) - C36-3 (combination meter)	Always	Below 1 Ω

4. Reconnect the ECM connector.
5. Reconnect the combination meter connector.
Fig 3: Identifying Combination Meter And ECM Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG : REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK : REPLACE COMBINATION METER  (See REMOVAL )