DI58 DIA8Y0 DTC P05 Engine Coolant Temperature Circuit DTC P07 Engine Coolant Temperature Circuit Low Input DTC P08 Engine Coolant Temperature Circuit High Input CICUIT DESCIPTI A thermistor built in the engine coolant temperature sensor changes the resistance value according to the engine coolant temperature. The structure of the sensor and connection to the is the same as those of the intake air temperature circuit malfunction shown on page DI54. If the detects the DTC P05, P07 or P08, it operates the fail safe functions in witch the engine coolant temperature is assumed to be 80 C (76 F) DTC No. Proceed to DTC Detection Condition Trouble Area P05 Step P07 Step 4 P08 Step Open or short in engine coolant temp. sensor circuit for 0.5 sec. Short in engine coolant temp. sensor circuit for 0.5 sec. Open in engine coolant temp. sensor circuit for 0.5 sec. Open or short in engine coolant temp. sensor circuit Engine coolant temp. sensor After confirming DTC P05, P07 or P08 use the handheld tester or the OBD II scan tool to confirm the engine coolant temperature from the DIAGNOSIS/ENHANCED OBD II/DATA LIST/ALL. Temperature Displayed 40 C (40 F) Malfunction Open circuit 40 (84 F) or more Short circuit 003 TOYOTA TACOMA (M00U) 50
DI59 WII DIAGAM Engine Coolant Temp. Sensor G 8 G EE BB EE LB E A466 INSPECTI POCEDUE If different DTCs that are related to different systems are output simultaneously while terminal E is used as a ground terminal, terminal E may be open. ead freeze frame data using the handheld tester or the OBD II scan tool, as freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, it is useful for determining whether the vehicle was running or stopped, the engine was warmed up or not, the airfuel ratio was lean or rich, etc. at the time of the malfunction. Connect OBD II scan tool or handheld tester, and read value of engine coolant temperature. (a) Connect the OBD II scan tool or handheld tester to the DLC3. (b) Turn the ignition switch and push the OBD II scan tool or handheld tester main switch. (c) Select the item DIAGNOSIS/ENHANCED OBD II/DATA handheld tester. : Same as actual engine coolant temperature. If there is open circuit, OBD II scan tool or handheld tester indicates 40 C (40 F). If there is short circuit, OBD II scan tool or hand held tester indicates 40 C (84 F) or more. 40 C (40 F)... Go to step. 40 C (84 F) or more... Go to step 4. Check for intermittent problems (See page DI8). 003 TOYOTA TACOMA (M00U) 5
DI60 Check for open in harness or. BE6653 A3 Engine Coolant Temp. Sensor 8 E A37 (b) Connect the sensor wire harness terminals together. (c) Turn the ignition switch. (d) Select the item DIAGNOSIS/ENHANCED OBD II/DATA handheld tester. : Temperature value: 40 C (84 F) or more Confirm good connection at sensor. If, replace engine coolant temperature sensor. 3 Check for open in harness or. Engine Coolant Temp. Sensor E 8 E A5300 (b) emove the glove compartment (See page SF63). (c) Connect terminals and E of the connector. The engine coolant temperature sensor connector is disconnected. Before checking, do a visual and contact pressure check of the pressure of the connector (See page IN8). (d) Turn the ignition switch. (e) Select the item DIAGNOSIS/ENHANCED OBD II/DATA handheld tester. : Temperature value: 40 C (84 F) or more Open in harness between terminals E and, repair or replace harness. 003 TOYOTA TACOMA (M00U) 5
DI6 Confirm good connection at. If, check and replace (See page IN8). 4 Check for short in harness and. BE6653 A34 Engine Coolant Temp. Sensor 8 E A38 (b) Turn the ignition switch. (c) Select the item DIAGNOSIS/ENHANCED OBD II/DATA handheld tester. : Temperature value: 40 C (40 F) eplace engine coolant temperature sensor (See page SF53). 003 TOYOTA TACOMA (M00U) 53
DI6 5 Check for short in harness or. Engine Coolant Temp. Sensor E Connector A599 (a) emove the glove compartment (See page SF63). (b) Disconnect the connector. The engine coolant temperature sensor connector is disconnected. (c) Turn the ignition switch. (d) Select the item DIAGNOSIS/ENHANCED OBD II/DATA handheld tester. : Temperature value: 40 C (40 F) epair or replace harness or connector. Check and replace (See page IN8). 003 TOYOTA TACOMA (M00U) 54