P0115 · blink 22 – WATER TEMP. CIRCUIT MALFUNCTION

System

EFI 1ZZ-FE

Dashboard light

Malfunction indicator lamp (Check Engine)

Check-engine blink code

22

Applies to

1ZZ-FE 1.8 (PK Altis 2005-08 ZZE122; JDM ZZE122/124, Allex/Runx/Fielder 1.8)

Description

WATER TEMP. CIRCUIT MALFUNCTION

Detection / symptoms

Detection: Open or short in water temp. sensor circuit

Possible causes

Open or short in water temp. sensor circuit; Water temp. sensor; Engine ECU

What to check

Workshop check order (RM821E): READ VALUE OF COOLANT TEMP/WATER TEMP -> CHECK HARNESS AND CONNECTOR(CHECK FOR OPEN) -> INSPECT ECU(CHECK FOR OPEN) -> CHECK HARNESS AND CONNECTOR(CHECK FOR SHORT) -> INSPECT ENGINE ECU FUNCTION(CHECK FOR SHORT) -> INSPECT ENGINE ECU FUNCTION(ENGINE ECU CONNECTOR) -> CHECK WATER TEMPERATURE SENSOR -> CHECK HARNESS AND CONNECTOR(ENGINE ECU−WATER TEMPERATURE

Confidence

high (official Toyota RM821E)

From the factory service material. Clear the code and test-drive to confirm it returns. Search all fault codes · Common problems · Warning lights

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