2001 NISSAN ALMERA ignition

Diagnostic ProcedureNJEC0579
1 CHECK ENGINE START
Turn ignition switch ªOFFº, and restart engine.
Is engine running?
YesorNo
Yes (With CONSULT-II)©GO TO 2.
Yes (Without CONSULT-
II)©GO TO 12.
No©GO TO 3.
2 SEARCH FOR MALFUNCTIONING CIRCUIT
With CONSULT-II
1. Perform ªPOWER BALANCEº in ªACTIVE TESTº mode with CONSULT-II.
2. Search for circuit which does not produce a momentary engine speed drop.
SEF190Y
©GO TO 12.
3 CHECK IGNITION COIL POWER SUPPLY CIRCUIT-I
1. Turn ignition switch ON.
2. Check voltage between ECM terminals 110, 112 and ground with CONSULT-II or tester.
SEF366X
OK or NG
OK©GO TO 4.
NG©GO TO TROUBLE DIAGNOSIS FOR POWER SUPPLY, EC-178.
IGNITION SIGNALQG
Diagnostic Procedure
EC-551

4 CHECK IGNITION COIL POWER SUPPLY CIRCUIT-II
1. Turn ignition switch OFF.
2. Disconnect condenser harness connector.
JEF121Y
3. Turn ignition switch ON.
4. Check voltage between condenser terminal 1 and ground with CONSULT-II or tester.
SEF367X
OK or NG
OK©GO TO 10.
NG©GO TO 5.
5 CHECK IGNITION COIL POWER SUPPLY CIRCUIT-III
1. Turn ignition switch OFF.
2. Disconnect ECM relay. (For ECM relay location, refer to ªEngine Control Component Parts Locationº.)
3. Check harness continuity between ECM relay terminal 7 and condenser terminal 1. 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 7.
NG©GO TO 6.
6 DETECT MALFUNCTIONING PART
Check the harness for open or short between ECM relay and condenser.
©Repair open circuit or short to ground or short to power in harness or connectors.
IGNITION SIGNALQG
Diagnostic Procedure (Cont'd)
EC-552

7 CHECK IGNITION COIL POWER SUPPLY CIRCUIT-IV
Check voltage between ECM relay terminal 6 and ground with CONSULT-II or tester.
SEF368X
OK or NG
OK©GO TO 9.
NG©GO TO 8.
8 DETECT MALFUNCTIONING PART
Check the following.
+15A fuse
+Harness connectors E75, F36 (If so equipped)
+Harness for open and short between ECM relay and fuse
©Repair or replace harness or connectors.
9 CHECK ECM RELAY
Refer to ªComponent Inspectionº, EC-555.
OK or NG
OK©GO TO 17.
NG©Replace ECM relay.
10 CHECK CONDENSER GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Check harness continuity between condenser terminal 2 and engine ground. 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 11.
NG©Repair open circuit or short to ground or short to power in harness or connectors.
11 CHECK CONDENSER
Refer to ªComponent Inspectionº, EC-555.
OK or NG
OK©GO TO 12.
NG©Replace condenser.
IGNITION SIGNALQG
Diagnostic Procedure (Cont'd)
EC-553

12 CHECK IGNITION COIL POWER SUPPLY CIRCUIT-V
1. Turn ignition switch OFF.
2. Reconnect harness connectors disconnected.
3. Disconnect ignition coil harness connector.
JEF119Y
4. Turn ignition switch ON.
5. Check voltage between ignition coil terminal 1 and ground with CONSULT-II or tester.
SEF122Y
OK or NG
OK©GO TO 14.
NG©GO TO 13.
13 DETECT MALFUNCTIONING PART
Check the following.
+Harness connector E75, F36 (If so equipped)
+Harness for open or short between ignition coil and ECM relay terminal 7
©Repair or replace harness or connectors.
14 CHECK IGNITION COIL GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Check harness continuity between ignition coil terminal 2 and engine ground. 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 15.
NG©Repair open circuit or short to ground or short to power in harness or connectors.
IGNITION SIGNALQG
Diagnostic Procedure (Cont'd)
EC-554

15 CHECK IGNITION COIL OUTPUT SIGNAL CIRCUIT
1. Disconnect ECM harness connector.
2. Check harness continuity between ECM terminals 35, 36, 37, 38 and ignition coil terminal 3. 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 16.
NG©Repair open circuit or short to ground or short to power in harness or connectors.
16 CHECK IGNITION COIL WITH POWER TRANSISTOR
Refer to ªComponent Inspectionº, EC-555.
OK or NG
OK©GO TO 17.
NG©Replace ignition coil with power transistor.
17 CHECK INTERMITTENT INCIDENT
Refer to ªTROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENTº, EC-177.
©INSPECTION END
SEF371Q
Component InspectionNJEC0547IGNITION COIL WITH POWER TRANSISTORNJEC0547S011. Disconnect ignition coil with power transistor harness connec-
tor.
2. Check ignition coil with power transistor for resistance as show
in the figure.
Terminal No. (Polarity) ResistanceW[at 25ÉC (77ÉF)]
3 (+) - 2 (þ) Except 0 or¥
1 (+) - 3 (þ)
Except 0
1 (+) - 2 (þ)
If NG, replace ignition coil with power transistor assembly.
SEF123Y
ECM RELAYNJEC0547S031. Apply 12V of direct current between ECM relay terminals 1 and
2.
2. Check continuity between ECM relay terminals 3 and 5, and 6
and 7.
Condition Continuity
12V direct current supply between ter-
minals 1 and 2Ye s
OFF No
IGNITION SIGNALQG
Diagnostic Procedure (Cont'd)
EC-555

If NG, replace ECM relay.
SEF124Y
CONDENSERNJEC0547S021. Disconnect condenser harness connector.
2. Check condenser continuity between terminals 1 and 2.
Resistance: Above 1 MWat 25ÉC (77ÉF)
If NG, replace condenser.
IGNITION SIGNALQG
Component Inspection (Cont'd)
EC-556

CONSULT-II Reference Value in Data Monitor
Mode
NJEC0441Specification data are reference values.
MONITOR ITEM CONDITION SPECIFICATION
START SIGNAL+Ignition switch: ON®START®ON OFF®ON®OFF
ECM Terminals and Reference ValueNJEC0442Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.
TERMI-
NAL
NO.WIRE
COLORITEM CONDITION DATA (DC Voltage)
41 B/Y Start signal[Ignition switch ªONº]Approximately 0V
[Ignition switch ªSTARTº]9 - 12V
START SIGNALQG
CONSULT-II Reference Value in Data Monitor Mode
EC-557

Diagnostic Procedure=NJEC0443
1 INSPECTION START
Do you have CONSULT-II?
YesorNo
Ye s©GO TO 2.
No©GO TO 3.
2 CHECK OVERALL FUNCTION
With CONSULT-II
1. Turn ignition switch ªONº.
2. Check ªSTART SIGNALº in ªDATA MONITORº mode with CONSULT-II under the following conditions.
SEF227Y
OK or NG
OK©INSPECTION END
NG©GO TO 4.
3 CHECK OVERALL FUNCTION
Without CONSULT-II
1. Turn ignition switch to ªSTARTº.
2. Check voltage between ECM terminal 41 and ground under the following conditions.
SEF613Y
OK or NG
OK©INSPECTION END
NG©GO TO 4.
START SIGNALQG
Diagnostic Procedure
EC-559