Inspection Procedure

1. Perform troubleshooting in accordance with the table below.

   Result 

   RESULT 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 a Techstream to the DLC3.
2. Turn the ignition switch to ON.
3. Turn the tester 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.

NG: Go to step 4 

Fig 1: Identifying ECM Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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
   
   

   Tester Connection	Condition	Specified Condition
   A21-24 (W) or F1-9 (EFI) - Body ground	Always	10 kΩ or higher

4. Reconnect the ECM connector.
5. Reconnect the combination meter connector.

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

Fig 2: Identifying Combination Meter And ECM Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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 : CHECK FOR INTERMITTENT PROBLEMS  (See CHECK FOR INTERMITTENT PROBLEMS  )

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

   Result 

   RESULT REFERENCE
   
   

   Result	Proceed to
   Engine starts	A
   Engine does not start*	B
   HINT: *: 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
   
   

   Tester Connection	Condition	Specified Condition
   A21-24 (W) - F1-9 (EFI)	Always	Below 1 Ω

4. Reconnect the ECM connector.
5. Reconnect the combination meter connector.

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

Fig 3: Identifying Combination Meter And ECM Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK : REPLACE COMBINATION METER  (See REMOVAL )