Typical Malfunction Thresholds

ECT sensor stuck (low ECT):

ECT change

Less than 3°C (5.4°F)

ECT sensor stuck (high ECT):

ECT change

1oC (1.8oF) or less

COMPONENT OPERATING RANGE

ECT

Varies with actual ECT

WIRING DIAGRAM

Refer to DTC P0115 (See page ES-103).

HINT:

If any of DTCs P0115, P0117, P0118 or P0125 are set simultaneously with DTC P0116, the ECT sensor may have an open or a short circuit. Troubleshoot those DTCs first.

Read freeze frame data using the intelligent tester. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was LEAN or RICH, and other data from the time the malfunction occurred.

CHECK ANY OTHER DTC OUTPUT (IN ADDITION TO DTC P0116)

(a) Connect a intelligent tester to the DLC3.

(b) Turn the ignition switch to ON.

(d) Select the following menu items: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODES.

Result

Display (DTC output)

Proceed to

P0116 and other DTCs

B

P0116

If any DTCs other than P0116 are output, troubleshoot those DTCs first.

GO TO DTC CHART

REPLACE ENGINE COOLANT TEMPERATURE SENSOR

Voltmeter v.

Engine Coolant Temp Circuit Malfunction
©©

Ohmmeter kQ 1 0.5

Ohmmeter kQ 1 0.5

Tacoma Temperature Display Fix
0 20 40 60 80 (32) (68) (104)(140)(176)

G037689E01

MASS AIR FLOW METER

INSPECTION

Do It Yourself Car Diagnosis

Do It Yourself Car Diagnosis

Don't pay hundreds of dollars to find out what is wrong with your car. This book is dedicated to helping the do it yourself home and independent technician understand and use OBD-II technology to diagnose and repair their own vehicles.

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