2003 NISSAN ALMERA N16 ecm

2 CHECK ACCELERATOR POSITION SWITCH FUNCTION
With CONSULT-II
1. Select “OFF ACCEL SW” in “DATA MONITOR” mode with CONSULT-II.
2. Check “OFF ACCEL SW” signal under the following conditions.
SEF910Y
Without CONSULT-II
Check voltage between ECM terminal 435 and ground under the following conditions.
SEF911Y
OK or NG
OK GO TO 16.
NG GO TO 11.
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DTC P0120 ACCEL POS SENSORYD
Diagnostic Procedure (Cont’d)
EC-93

3 CHECK ACCELERATOR POSITION SENSOR POWER SUPPLY CIRCUIT
1. Turn ignition switch “OFF”.
2. Disconnect accelerator work unit harness connector.
SEF886Y
3. Turn ignition switch “ON”.
4. Check voltage between accelerator work unit terminal 5 and ground with CONSULT-II or tester.
SEF897Y
OK or NG
OK GO TO 5.
NG GO TO 4.
4 DETECT MALFUNCTIONING PART
Check the following.
Harness connectors F112, M74
Harness for open or short between ECM and accelerator work unit
Repair harness or connectors.
DTC P0120 ACCEL POS SENSORYD
Diagnostic Procedure (Cont’d)
EC-94

5 CHECK ACCELERATOR POSITION SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch “OFF”.
2. Loosen and retighten engine ground screw.
SEF380Y
3. Check harness continuity between accelerator work unit terminal 4 and engine ground. 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 following.
Harness connectors F112, M74
Harness for open or short between ECM and accelerator work unit
Repair open circuit or short to ground or short to power in harness or connectors.
7 CHECK ACCELERATOR POSITION SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Disconnect ECM harness connector.
2. Check harness continuity between ECM terminal 434 and accelerator workunit terminal 2. 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 9.
NG GO TO 8.
8 DETECT MALFUNCTIONING PART
Check the following.
Harness connectors F112, M74
Harness for open or short between ECM and accelerator work unit
Repair open circuit or short to ground or short to power in harness or connectors.
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DTC P0120 ACCEL POS SENSORYD
Diagnostic Procedure (Cont’d)
EC-95

9 CHECK ACCELERATOR POSITION SENSOR
With CONSULT-II
1. Reconnect all disconnected harness connectors.
2. Turn ignition switch “ON”.
3. Select “DATA MONITOR” mode with CONSULT-II.
4. Check the indication of “ACCEL POS SEN” under the following conditions.
SEF436Z
OK or NG
OK GO TO 16.
NG Replace accelerator pedal assembly.
10 CHECK ACCELERATOR POSITION SENSOR
Without CONSULT-II
1. Reconnect all disconnected harness connectors.
2. Turn ignition switch “ON”.
3. Check voltage between ECM terminal 434 and ground under the following conditions.
SEF437Z
OK or NG
OK GO TO 16.
NG Replace accelerator pedal assembly.
DTC P0120 ACCEL POS SENSORYD
Diagnostic Procedure (Cont’d)
EC-96

11 CHECK ACCELERATOR POSITION SWITCH POWER SUPPLY CIRCUIT
1. Turn ignition switch “OFF”.
2. Disconnect accelerator work unit harness connector.
SEF886Y
3. Turn ignition switch “ON”.
4. Check voltage between accelerator work unit terminal 3 and ground with CONSULT-II or tester.
SEF912Y
OK or NG
OK GO TO 13.
NG GO TO 12.
12 DETECT MALFUNCTIONING PART
Check the following.
Harness connectors M74, F112
Harness for open or short between accelerator work unit and ECM
Repair harness or connectors.
13 CHECK ACCELERATOR POSITION SWITCH GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch “OFF”.
2. Disconnect ECM harness connector.
3. Check harness continuity between accelerator work unit terminal 1 and ECM terminal 426. 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 15.
NG GO TO 14.
14 DETECT MALFUNCTIONING PART
Check the following.
Harness connectors M74, F112
Harness for open or short between ECM and accelerator work unit
Repair open circuit or short to ground or short to power in harness or connectors.
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DTC P0120 ACCEL POS SENSORYD
Diagnostic Procedure (Cont’d)
EC-97

SEF420Z
DescriptionNJEC0686The crankshaft position sensor (TDC) monitors engine speed by
means of signals from the sensing plate (with three protrusions)
installed to the crankshaft pulley. The datum signal output is
detected at ATDC 10° and sent to the ECM. The sensor signal is
used for fuel injection control and fuel injection timing control.
CONSULT-II Reference Value in Data Monitor
Mode
NJEC0687Specification data are reference values.
MONITOR ITEM CONDITION SPECIFICATION
CKPS·RPM (TDC)Run engine and compare the CONSULT-II value with tachometer
indication.Almost the same speed as the
tachometer indication.
ECM Terminals and Reference ValueNJEC0688Specification data are reference values and are measured between each terminal and ground.
Pulse signal is measured by CONSULT-II.
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 CONDITIONDATA(DC Voltage and Pulse
Signal)
331 ORCrankshaft position sen-
sor (TDC) ground[Engine is running]
Warm-up condition
Idle speedApproximately 0V
344 WCrankshaft position sen-
sor (TDC)[Engine is running]
Warm-up condition
Idle speedApproximately 0V
SEF333Y
[Engine is running]
Warm-up condition
Engine speed is 2,000 rpmApproximately 0V
SEF334Y
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DTC P0335 CRANK POS SEN (TDC)YD
Description
EC-99

On Board Diagnosis Logic=NJEC0689This self-diagnosis has the one trip detection logic.
DTC Malfunction is detected when ... Check Items (Possible Cause)
P0335
0407An improper signal from the sensor is sent to
ECM during engine running and cranking.Harness or connectors
(The sensor circuit is open.)
Crankshaft position sensor (TDC)
SEF817Y
DTC Confirmation ProcedureNJEC0690Before performing the following procedure, confirm that bat-
tery voltage is more than 10V.
WITH CONSULT-IINJEC0690S011) Turn ignition switch “ON” and select “DATA MONITOR” mode
with CONSULT-II.
2) Crank engine for at least 1 second.
3) Start engine and run it for at least 2 seconds at idle speed.
4) If DTC is detected, go to “Diagnostic Procedure”, EC-102.
WITHOUT CONSULT-IINJEC0690S021) Crank engine for at least 1 second.
2) Start engine and run it for at least 2 seconds at idle speed.
3) Turn ignition switch “OFF”, wait at least 5 seconds and then
turn “ON”.
4) Perform “Diagnostic Test Mode II (Self-diagnostic results)” with
ECM.
5) If DTC is detected, go to “Diagnostic Procedure”, EC-102.
DTC P0335 CRANK POS SEN (TDC)YD
On Board Diagnosis Logic
EC-100

Diagnostic ProcedureNJEC0692
1 CHECK CRANKSHAFT POSITION SENSOR (TDC) GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch “OFF”.
2. Loosen and retighten engine ground screws.
SEF380Y
3. Disconnect crankshaft position sensor (TDC) harness connector and ECMharness connector.
SEF387Y
4. Check harness continuity between ECM terminal 331 and crankshaft position sensor (TDC) terminal 1. Refer to Wiring
Diagram.
Continuity should exist.
5. Also check harness for short to ground and short to power.
OK or NG
OK GO TO 2.
NG Repair open circuit or short to ground or short to power in harness or connectors.
2 CHECK CRANKSHAFT POSITION SENSOR (TDC) INPUT SIGNAL CIRCUIT FOR OPEN ANDSHORT
1. Check harness continuity between crankshaft position sensor (TDC) terminal 2 and ECM terminal 344. Refer to Wiring
Diagram.
Continuity should exist.
2. Also check harness for short to ground and short to power.
OK or NG
OK GO TO 3.
NG Repair open circuit or short to ground or short to power in harness or connectors.
DTC P0335 CRANK POS SEN (TDC)YD
Diagnostic Procedure
EC-102