7 CHECK MASS AIR FLOW SENSOR 1. Reconnect harness connectors disconnected. SEF400Y 4. If the voltage is out of specification, disconnect mass air flow sensor harness connector and connect it again. OK or NG OK E GO TO 8. NG E Replace mass air flow sensor.
8 CHECK INTERMITTENT INCIDENT Refer to “TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT”, E INSPECTION END DTC 0102 MASS AIR FLOW SEN ZD30DDTi Diagnostic Procedure (Cont’d) EC-94. Description The engine coolant temperature sensor is used to detect the engine coolant temperature. The sensor modifies a voltage signal from the ECM. The modified signal returns to the ECM as the engine cool- ant temperature input. The sensor uses a thermistor which is sen- sitive to the change in temperature. The electrical resistance of the thermistor decreases as temperature increases. Engine coolant tempera- ture °C (°F) Voltage. (V) Resistance (k Ω ) −10 (14) 4.4 7.0 - 11.4 20 (68) 3.5 2.1 - 2.9 50 (122) 2.3 0.68 - 1.00 90 (194) 1.0 0.236 - 0.260.: These data are reference values and measured between ECM terminal 19 (Engine coolant temperature sensor) and ground. CAUTION: Do not use ECM ground terminals when measuring input/ output voltage. Doing so may damage the ECM’s transistor. On Board Diagnosis Logic Malfunction is detected when. Check Items (Possible Cause) I An excessively high or low voltage from the sensor is entered to ECM. I Harness or connectors (The sensor circuit is open or shorted.) I Engine coolant temperature sensor DTC Confirmation Procedure WITH CONSULT-II 1) Turn ignition switch “ON”.
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4) If DTC is detected, go to “Diagnostic Procedure”, WITHOUT CONSULT-II 1) Turn ignition switch “ON” and wait at least 5 seconds. 2) Turn ignition switch “OFF”, wait at least 5 seconds and then turn “ON”. 3) Perform “Diagnostic Test Mode II (Self-diagnostic results)” with ECM. 4) If DTC is detected, go to “Diagnostic Procedure”, SEF594K SEF012P SEF817Y DTC 0103 COOLANT TEMP SEN ZD30DDTi EC-95. Diagnostic Procedure 1 CHECK ECTS POWER SUPPLY CIRCUIT 1. Turn ignition switch “OFF”.
MEC022E 3. Turn ignition switch “ON”. SEF401Y OK or NG OK E GO TO 3. NG E GO TO 2. 2 DETECT MALFUNCTIONING PART Check the following. I Harness connectors E225, F108 I Harness connectors F135, M842 (RHD models) I Harness for open or short between engine control temperature sensor and ECM E Repair open circuit or short to ground or short to power in harness or connectors. 3 CHECK ECTS GROUND CIRCUIT FOR OPEN AND SHORT 1. Turn ignition switch “OFF”.
OK or NG OK E GO TO 5. NG E GO TO 4. DTC 0103 COOLANT TEMP SEN ZD30DDTi EC-97.
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