Toyota 1 MZ–FE Manual page 458

EG2–458
DIAGNOSTIC CHART
HINT: If diagnostic trouble codes "P0110" (intake air temp. circuit malfunction), "P0115" (engine
coolant temp. circuit malfunction) and "P0120" (throttle position circuit malfunction) are output
simultaneously, E2 (sensor ground) may be open.
1
Connect the OBDII scan tool or TOYOTA hand–held
tester and read value of engine coolant temp.
Check for intermittent problems.
2
Check for open in harness or ECM.
3
Check for open in harness or ECM.
Confirm connection at ECM. If OK, replace ECM.
4
Check for short in harness and ECM.
5
Check for short in harness or ECM.
Check and replace ECM.
1MZ–FE ENGINE – CIRCUIT INSPECTION
– 402C (– 402F) ......... Go to step
1202C (2482F) or more .. Go to step
Confirm good connection at sensor.
If OK, replace engine coolant temp. sensor.
Open in harness between ECM and engine
coolant temp. sensor.
Replace engine coolant temp. sensor.
Repair or replace harness or connector.