NISSAN ALMERA N16 2003 Electronic Repair Manual

Diagnostic ProcedureNJEC0653
1 CHECK ECTS POWER SUPPLY CIRCUIT
1. Turn ignition switch “OFF”.
2. Disconnect engine coolant temperature sensor harness connector.
SEF382Y
3. Turn ignition switch “ON”.
4. Check voltage between ECTS terminal 2 and ground with CONSULT-II or tester.
SEF401Y
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 ECTS GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch “OFF”.
2. Check harness continuity between ECTS terminal 1 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 4.
NG GO TO 3.
3 DETECT MALFUNCTIONING PART
Check the following harness for open or short between ECM and engine coolant temperature sensor.
Repair open circuit or short to ground or short to power in harness or connectors.
GI
MA
EM
LC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
HA
SC
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IDX
DTC P0115 COOLANT TEMP SENYD
Diagnostic Procedure
EC-87

4 CHECK ENGINE COOLANT TEMPERATURE SENSOR
1. Remove engine coolant temperature sensor from the engine.
2. Check resistance between ECTS terminals 1 and 2 as shown in the figure.
SEF304X
OK or NG
OK GO TO 5.
NG Replace engine coolant temperature sensor.
5 CHECK INTERMITTENT INCIDENT
Refer to “TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT”, EC-71.
INSPECTION END
DTC P0115 COOLANT TEMP SENYD
Diagnostic Procedure (Cont’d)
EC-88

DescriptionNJEC0679The accelerator work unit is installed on the upper end of the accelerator pedal assembly. The accelerator
position sensor and accelerator position switch are built into the accelerator work unit. The sensor detects the
accelerator position and sends a signal to the ECM. The ECM uses the signal to determine the amount of fuel
to be injected.
The accelerator position switch detects Off-accelerator switch signal and send these signals to the ECM. The
ECM will then determine engine idle conditions. These signals are also used for diagnosing the accelerator
position sensor.
SEF885Y
CONSULT-II Reference Value in Data Monitor
Mode
NJEC0680Specification data are reference values.
MONITOR ITEM CONDITION SPECIFICATION
ACCEL POS SENIgnition switch: ON
(Engine stopped)Accelerator pedal: released 0.30 - 0.50V
Accelerator pedal: depressed 3.0 - 4.3V
OFF ACCEL SWIgnition switch: ON
(Engine stopped)Accelerator pedal: fully released ON
Accelerator pedal: slightly open OFF
ECM Terminals and Reference ValueNJEC0681Specification 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)
425 P/BAccelerator position sensor
ground[Engine is running]
Warm-up condition
Idle speedApproximately 0V
426 BR/RAccelerator position switch
(Idle) ground[Ignition switch “ON”]Approximately 0V
433 G/YAccelerator position sensor
power supply[Ignition switch “ON”]Approximately 5V
GI
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DTC P0120 ACCEL POS SENSORYD
Description
EC-89

TERMI-
NAL
NO.WIRE
COLORITEM CONDITION DATA(DC Voltage)
434 W Accelerator position sensor[Ignition switch “ON”]
Accelerator pedal fully released0.30 - 0.50V
[Ignition switch “ON”]
Accelerator pedal fully depressed3.0 - 4.3V
435 W/GAccelerator position switch
(Idle)[Ignition switch “ON”]
Accelerator pedal fully releasedApproximately 0V
[Ignition switch “ON”]
Accelerator pedal depressedBATTERY VOLTAGE
(11 - 14V)
On Board Diagnosis LogicNJEC0682This self-diagnosis has the one trip detection logic.
DTC Malfunction is detected when ... Check Items (Possible Cause)
P0120
0403The relation between sensor and switch signals
is not in the nomal range during the specified
accelerator positions.Harness or connectors
(The sensor circuit is open or shorted.)
Accelerator position sensor
Accelerator position switch
SEF817Y
DTC Confirmation ProcedureNJEC0683WITH CONSULT-IINJEC0683S011) Turn ignition switch “ON”.
2) Select “DATA MONITOR” mode with CONSULT-II.
3) Depress and release fully accelerator pedal slowly.
4) If DTC is detected, go to “Diagnostic Procedure”, EC-92.
WITHOUT CONSULT-IINJEC0683S021) Turn ignition switch “ON”.
2) Depress and release fully accelerator pedal slowly.
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-92.
DTC P0120 ACCEL POS SENSORYD
ECM Terminals and Reference Value (Cont’d)
EC-90

Wiring DiagramNJEC0684
YEC012A
GI
MA
EM
LC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P0120 ACCEL POS SENSORYD
Wiring Diagram
EC-91

Diagnostic ProcedureNJEC0685
1 CHECK ACCELERATOR POSITION SENSOR FUNCTION
With CONSULT-II
1. Turn ignition switch “ON”.
2. Select “ACCEL POS SEN” in “DATA MONITOR” mode with CONSULT-II.
3. Check “ACCEL POS SEN” signal under the following conditions.
SEF436Z
Without CONSULT-II
1. Turn ignition switch “ON”.
2. Check voltage between ECM terminal 434 and ground under the following conditions.
SEF437Z
OK or NG
OK GO TO 2.
NG GO TO 3.
DTC P0120 ACCEL POS SENSORYD
Diagnostic Procedure
EC-92

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.
GI
MA
EM
LC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
HA
SC
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IDX
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