User manual NISSAN ENGINE CONTROL SYSTEM CD20T

[. . . ] ENGINE CONTROL SYSTEM SECTION EC EC CONTENTS CD20T PRECAUTIONS AND PREPARATION . . . . . . . . . . . . . . . . . . . . . 4 Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 ENGINE AND EMISSION CONTROL OVERALL SYSTEM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Engine Control Module Component Parts Location. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ] Check harness continuity between mass air flow sensor connector terminal V 3 and ECM connector terminal V . OK . NG c Repair harness or connectors. Mass air flow: sensor connector CHECK INPUT SIGNAL CIRCUIT. Check harness continuity between mass air flow sensor connector terminal V and 4 ECM connector terminal V , mass air flow 19 sensor connector terminal V and ECM 5 connector terminal V . OK NG c Repair harness or connectors. NEF790 . Mass air flow sensor connector CHECK COMPONENT (Mass air flow sensor). OK . NG c Replace mass air flow sensor. Disconnect and reconnect harness connectors in the circuits. Trouble is not fixed. NEF791 . Check ECM pin terminals for damage or the connection of ECM harness connector. . INSPECTION END EC-CD-67 CD20T TROUBLE DIAGNOSIS FOR DTC 12 Mass Air Flow Sensor (MAFS) (Cont'd) COMPONENT INSPECTION Mass air flow sensor connector Mass air flow sensor 1. Check voltage between mass air flow sensor connector terminal V and ground. 5 Conditions Ignition switch ``ON'' position (Engine stopped. ) NEF792 Voltage V Approximately 1. 0 1. 9 - 2. 3 Idle (Engine is warmed-up sufficiently. ) 4. Check hot film for damage or dust. NEF669 EC-CD-68 TROUBLE DIAGNOSIS FOR DTC 13 Terminal Sensor CD20T Engine Coolant Temperature (ECT) Sensor The engine coolant temperature sensor is used to detect the engine coolant temperature. The modified signal returns to the ECM as the engine coolant temperature input. The sensor uses a thermistor which is sensitive to the change in temperature. The electrical resistance of the thermistor decreases as temperature increases. SEF594K 20 10 8 6 4 2 1. 0 0. 8 0. 4 0. 2 0. 1 (-4) (32) (68) (104)(140)(176) (212) Gasket Reference data Acceptable Resistance k Engine coolant temperature °C (°F) -10 (14) 20 (68) 50 (122) 90 (194) SEF012P Voltage (V) 4. 4 3. 5 2. 3 1. 0 Resistance (k) 7. 0 - 11. 4 2. 1 - 2. 9 0. 68 - 1. 00 0. 236 - 0. 260 Temperature °C (°F) Diagnostic Trouble Code No. An excessively high or low voltage from the sensor is entered to ECM. q Check Items (Possible Cause) Harness or connectors (The sensor circuit is open or shorted. ) Engine coolant temperature sensor q DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCEDURE 1) Turn ignition switch to ``ON'' position. ------------------------------------------------------------- OR ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------1) Turn ignition switch to ``ON'' position and wait at least 5 seconds. 2) Turn ignition switch to ``LOCK'' position, wait at least 5 seconds and then turn to ``ON'' position. 3) Perform diagnostic test mode II (Self-diagnostic results). EC-CD-69 CD20T TROUBLE DIAGNOSIS FOR DTC 13 Engine Coolant Temperature (ECT) Sensor (Cont'd) EC-ECTS-01 ENGINE COOLANT TEMPERATURE SENSOR F12 2 L/OR 1 B : Detectable line for DTC : Non-detectable line for DTC L/OR 14 WTFI B 33 GND-A ECM F106 12 F12 GY 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 68 67 66 65 64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49 48 47 46 1 F106 GY YEC417 EC-CD-70 CD20T TROUBLE DIAGNOSIS FOR DTC 13 Engine Coolant Temperature (ECT) Sensor (Cont'd) . RH strut tower DIAGNOSTIC PROCEDURE INSPECTION START . . Engine coolant temperature sensor harness connector NEF401 Engine coolant temperature sensor connector CHECK POWER SUPPLY. Check voltage between engine coolant temperature sensor connector terminal V and ground with CON2 SULT-II or tester. Voltage: Approximately 4. 9V OK . NG c Repair harness or connectors. SEF541P Engine coolant temperature sensor connector CHECK GROUND CIRCUIT. Check harness continuity between engine coolant temperature sensor connector terminal V and engine 1 ground. OK NG c Repair harness or connectors. SEF542P . CHECK COMPONENT (Engine coolant temperature sensor). OK . NG c Replace engine coolant temperature sensor. Disconnect and reconnect harness connectors in the circuit. Trouble is not fixed. . Check ECM pin terminals for damage and check the connection of ECM harness connector. [. . . ] 2) Turn it to the ``LOCK'' position, wait at least 5 seconds. 3) Turn ignition switch to the ``ON'' position and perform ``Diagnostic Test Mode II'' (Self-diagnostic results). 1) DIAGNOSTIC PROCEDURE Refer to ``Trouble Diagnosis for Power Supply'' (EC-CD-62) for ECCS-D relay circuit inspection. EC-CD-145 TROUBLE DIAGNOSES FOR DTC 97 MI & Data Link Connectors CD20T Malfunction indicator (MI) circuit is monitored for open or shortcircuit. If the circuit is malfunctioning, MI can not report it but CONSULT-II can. Diagnostic Trouble Code No. [. . . ]