Page 1389 of 3051
Wiring DiagramNLEC1806MODELS WITH ECM IN ENGINE COMPARTMENTNLEC1806S03
YEC747
HEATED OXYGEN SENSOR 2 HEATER (REAR)SR20DE
Wiring Diagram
EC-964
Page 1390 of 3051
MODELS WITH ECM IN CABINNLEC1806S04
YEC934
HEATED OXYGEN SENSOR 2 HEATER (REAR)SR20DE
Wiring Diagram (Cont'd)
EC-965
Page 1392 of 3051

3 DETECT MALFUNCTIONING PART
Check the following.
+Harness connectors F38, M50 (where fitted)
+Harness connectors M72, F44 (where fitted)
+10A fuse
+Harness for open or short between heated oxygen sensor 2 (rear) and fuse
©Repair harness or connectors.
4 CHECK OUTPUT CIRCUIT
1. Turn ignition switch ªOFFº.
2. Disconnect ECM harness connector.
3. Check harness continuity between HO2S2 terminal 3 and ECM terminal 3.
Refer to wiring diagram.
Continuity should exist.
4. Also check harness for short to ground and short to power.
OK or NG
OK©GO TO 6.
NG©GO TO 5.
5 DETECT MALFUNCTIONING PART
Check the harness for open or short between heated oxygen sensor 2 heater (rear) and ECM.
©Repair open circuit or short to ground or short to power in harness or connectors.
6 CHECK HEATED OXYGEN SENSOR 2 HEATER (REAR)
Refer to ªComponent Inspectionº, EC-968.
OK or NG
OK©GO TO 7.
NG©Replace heated oxygen sensor 2 (rear).
7 CHECK INTERMITTENT INCIDENT
Perform ªTROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENTº, EC-670.
©INSPECTION END
HEATED OXYGEN SENSOR 2 HEATER (REAR)SR20DE
Diagnostic Procedure (Cont'd)
EC-967
Page 1395 of 3051
Wiring DiagramNLEC1813MODELS WITH ECM IN ENGINE COMPARTMENTNLEC1813S01
YEC756
CRANKSHAFT POSITION SENSOR (CKPS) (OBD)SR20DE
Wiring Diagram
EC-970
Page 1396 of 3051
MODELS WITH ECM IN CABINNLEC1813S02
YEC935
CRANKSHAFT POSITION SENSOR (CKPS) (OBD)SR20DE
Wiring Diagram (Cont'd)
EC-971
Page 1398 of 3051

3 CHECK INPUT SIGNAL CIRCUIT
1. Disconnect crankshaft position sensor (OBD) and ECM harness connectors.
SEF777Z
2. Check continuity between ECM terminal 65 and CKPS (OBD) terminal 1.
Refer to Wiring Diagram.
Continuity should exist.
3. Also check harness for short to ground and short to power.
OK or NG
OK©GO TO 5.
NG©GO TO 4.
4 DETECT MALFUNCTIONING PART
Check the harness for open or short between crankshaft position sensor (OBD) and ECM.
©Repair open circuit or short to ground or short to power in harness or connectors.
5 CHECK GROUND CIRCUIT
1. Reconnect ECM harness connector.
2. Check harness continuity between CKPS (OBD) terminal 2 and engine ground.
Refer to wiring diagram.
Continuity should exist.
3. Also check harness for short to power.
OK or NG
OK©GO TO 7.
NG©GO TO 6.
6 DETECT MALFUNCTIONING PART
Check the following.
+Joint connector-1 (where fitted)
+Joint connector F46 (where fitted)
+Harness for open or short between crankshaft position sensor (OBD) and ECM
+Harness for open or short between crankshaft position sensor (OBD) and TCM (Transmission control module)
©Repair open circuit or short to power in harness or connectors.
7 CHECK CRANKSHAFT POSITION SENSOR (OBD)
Refer to ªComponent Inspectionº, EC-974.
OK or NG
OK©GO TO 8.
NG©Replace crankshaft position sensor (OBD).
CRANKSHAFT POSITION SENSOR (CKPS) (OBD)SR20DE
Diagnostic Procedure (Cont'd)
EC-973
Page 1403 of 3051
Wiring DiagramNLEC1823
YEC757
EGR VOLUME CONTROL SYSTEM (WHERE FITTED)SR20DE
Wiring Diagram
EC-978
Page 1407 of 3051

7 CHECK GROUND CIRCUIT
1. Turn ignition switch ªOFFº.
2. Check harness continuity between EGR temperature sensor harness terminal 1 and engine ground.
Refer to wiring diagram.
Continuity should exist.
3. Also check harness for short to power.
OK or NG
OK©GO TO 9.
NG©GO TO 8.
8 DETECT MALFUNCTIONING PART
Check the following.
+Joint connector-1
+Harness for open or short between EGR temperature sensor and ECM
+Harness for open or short between EGR temperature sensor and TCM
©Repair open circuit or short to power in harness or connector.
9 CHECK EGR TEMPERATURE SENSOR
Refer to ªComponent Inspectionº, EC-985.
OK or NG
OK©GO TO 10.
NG©Replace EGR temperature senosr.
10 CHECK EGR VOLUME CONTROL VALVE POWER SUPPLY
1. Disconnect EGR volume control valve harness connector.
2. Turn ignition switch ªONº.
3. Check voltage between terminals 2, 5 and ground with CONSULT-II or tester.
SEF782Z
OK or NG
OK©GO TO 12.
NG©GO TO 11.
11 DETECT MALFUNCTIONING PART
Check the following.
+15A fuse
+Harness connectors E76, F36
+ECM relay
+Harness for open or short between EGR volume control valve and fuse
©Repair harness or connectors.
EGR VOLUME CONTROL SYSTEM (WHERE FITTED)SR20DE
Diagnostic Procedure (Cont'd)
EC-982