Hand-held tester:

1. Connect the hand-held tester to the DLC3.
2. Turn the power switch ON (IG).
3. Turn the hand-held tester ON.
4. On the hand-held tester, select the item: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODES.
5. Read DTCs.

   Result: 

   SCAN TOOL VALUES DESCRIPTION
   
   

   Display (DTC Output)	Proceed to
   P1121	A
   P1121 and other DTCs	B

   HINT:

   If any other codes besides P1121 are output, perform troubleshooting for those DTCs first.

1. B: GO TO RELEVANT DTC CHART (See  DIAGNOSTIC TROUBLE CODE CHART   ) 
2. A: GO TO NEXT STEP 

1. Connect the hand-held tester to the DLC3.
2. Turn the power switch ON (IG).
3. Turn the hand-held tester ON.
4. Put the engine in inspection mode (See PRECAUTION  ).
5. Start the engine and warm it up.
6. Select the items: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / WATER FLW VLV3, WATER FLW VLV4 or WATER FLW VLV5.
7. Measure the voltage between terminals WBAD and E2 of the ECM connector.

   Standard: 

   TESTER CONNECTION SPECIFIED CONDITION DESCRIPTION
   
   

   Tester Operation	Specified Condition
   "WATER FLW VLV 3" ON	Approximately 2.5 V
   "WATER FLW VLV 4" ON	Approximately 3.5 V
   "WATER FLW VLV 5" ON	Approximately 4.5 V

1. NG: REPLACE WATER W/BRACKET VALVE ASSY 
2. OK: GO TO NEXT STEP 

OK: Coolant passages are not clogged. 

1. NG: REPAIR OR REPLACE COOLING SYSTEM 
2. OK: GO TO NEXT STEP 

   REPLACE ECM (See  ECM (1NZ-FXE)  )