Toyota 1 MZ–FE Manual page 547

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.
TOYOTA hand–held tester
Check for open in harness or ECM.
Check for open in harness or ECM.
Confirm connection at ECM. If OK, replace ECM.
OBDII scan tool (excluding TOYOTA hand–held tester)
Check for open in harness or ECM.
Check for open in harness and connector between
throttle position sensor and ECM.
Confirm connection at ECM. If OK, replace ECM.
1MZ–FE ENGINE – CIRCUIT INSPECTION
Confirm good connection at sensor.
If OK, replace throttle position sensor.
Open in harness between ECM and
throttle position sensor.
Confirm good connection at sensor.
If OK, replace throttle position sensor.
Open in harness between ECM and throttle
position sensor.
EG2–547