Inspection Procedure

HINT:

Although each DTC title says "Coolant Flow Control Valve", these DTCs are related to the water valve.
CHS stands for Coolant Heat Storage.

CAUTION: Be careful when replacing any part in the system or changing the coolant because the coolant in the heat storage tank is hot even if the engine is cold.

HINT:

If DTCs P1121 and P1150 are detected simultaneously, there may be malfunction in the water valve system.
If DTC P1121 is detected, coolant passages may be clogged.
To check the coolant heat storage (CHS) system, the ECM may cause the water pump of the CHS system to operate 5 hours after the power switch has been turned OFF.
Read freeze frame data using Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air/fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.

CHECK OTHER DTC OUTPUT (IN ADDITION TO DTC P1121)

Connect Techstream to the DLC3.
Turn the power switch ON (IG).
Turn the tester ON.
Enter the following menus: Powertrain / Engine and ECT /Trouble Code.

Read DTCs.

Result

RESULT CHART

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.

B: GO TO DTC CHART

A: Go to next step

PERFORM ACTIVE TEST BY TECHSTREAM

Connect Techstream to the DLC3.
Turn the power switch ON (IG).
Turn the tester ON.
Put the engine in inspection mode (see SFI SYSTEM ).
Start the engine and warm it up.
Enter the following menus: Powertrain / Engine and ECT / Active Test / Activate the Water Flow Valve 3, Activate the Water Flow Valve 4 or Activate the Water Flow Valve 5.

Measure the voltage between terminals WBAD and E2 of the ECM connector.

Standard voltage

VOLTAGE SPECIFICATION

Tester Operation	Specified Condition
"Water Flow Valve 3" ON	Approximately 2.5 V
"Water Flow Valve 4" ON	Approximately 3.5 V
"Water Flow Valve 5" ON	Approximately 4.5 V

NG: REPLACE WATER W/BRACKET VALVE ASSEMBLY

OK: Go to next step

CHECK COOLING SYSTEM (CHECK FOR CLOGGING IN THE COOLANT SYSTEM)
OK:

Coolant passages are not clogged.

NG: REPAIR OR REPLACE COOLING SYSTEM

OK: REPLACE ECM