Infiniti I30. Emission Control System (2003 year). Manual

CHECK STOP LAMP SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1. Turn ignition switch “OFF”.
2. Disconnect ECM harness connector.
3. Disconnect stop lamp switch harness connector.

SEC053D

4. Check harness continuity between ECM terminal 55 and stop lamp switch terminal 2.

Refer to Wiring Diagram.

Continuity should exist.

5. Also check harness for short to ground and short to power.

OK or NG

䊳

GO TO 6.

䊳

GO TO 5.

DETECT MALFUNCTIONING PART

Check the following.

쐌

Harness connectors E81, M15

쐌

Harness connectors M223, F53

쐌

Harness for open or short between ECM and stop lamp switch

䊳

Repair open circuit or short to ground or short to power in harness or connectors.

CHECK STOP LAMP SWITCH

Refer to “Component Inspection”, EC-642.

OK or NG

䊳

GO TO 7.

䊳

Replace stop lamp switch.

CHECK INTERMITTENT INCIDENT

Refer to “TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT”, EC-151.

䊳

INSPECTION END

IDX

DTC P1805 BRAKE SWITCH

Diagnostic Procedure (Cont’d)

EC-641

SEC053D

Component Inspection

=NHEC1284

STOP LAMP SWITCH
1.

Disconnect stop lamp switch harness connector.

SEC052D

Check continuity between stop lamp switch terminals 1 and 2
under the following conditions.

Conditions

Continuity

Brake pedal released

Should not exist.

Brake pedal depressed

Should exist.

If NG, replace stop lamp switch.

DTC P1805 BRAKE SWITCH

Component Inspection

EC-642

PBIB1741E

Component Description

NHEC1386

The accelerator pedal position sensor is installed on the upper end
of the accelerator pedal assembly. The sensor detects the accel-
erator position and sends a signal to the ECM.
Accelerator pedal position sensor has two sensors. These sensors
are a kind of potentiometers which transform the accelerator pedal
position into output voltage, and emit the voltage signal to the ECM.
In addition, these sensors detect the opening and closing speed of
the accelerator pedal and feed the voltage signals to the ECM. The
ECM judges the current opening angle of the accelerator pedal
from these signals and controls the throttle control motor based on
these signals.
Idle position of the accelerator pedal is determined by the ECM
receiving the signal from the accelerator pedal position sensor. The
ECM uses this signal for the engine operation such as fuel cut.

CONSULT-II Reference Value in Data Monitor
Mode

NHEC1387

Specification data are reference values.

MONITOR ITEM

CONDITION

SPECIFICATION

ACCEL SEN1

쐌

Ignition switch: ON
(engine stopped)
Shift lever: “D”

Accelerator pedal: Released

0.41 - 0.71V

Accelerator pedal: Fully depressed

More than 3.7V

ACCEL SEN2*

쐌

Ignition switch: ON
(engine stopped)
Shift lever: “D”

Accelerator pedal: Released

0.15 - 0.97V

Accelerator pedal: Fully depressed

More than 3.5V

CLSD THL POS

쐌

Ignition switch: ON
(engine stopped)
Shift lever: “D”

Accelerator pedal: Released

Accelerator pedal: Slightly
depressed

OFF

*: Accelerator pedal position sensor 2 signal is converted by ECM internally. Thus, it differs from ECM terminal voltage signal.

On Board Diagnosis Logic

NHEC1440

These self-diagnoses have the one trip detection logic.

DTC No.

Trouble diagnosis

name

DTC Detecting Condition

Possible Cause

P2122
2122

Accelerator pedal
position sensor 1 cir-
cuit low input

An excessively low voltage from the APP sensor 1
is sent to ECM.

쐌

Harness or connectors
(The APP sensor 1 circuit is open or
shorted.)

쐌

Accelerator pedal position sensor
(Accelerator pedal position sensor 1)

P2123
2123

Accelerator pedal
position sensor 1 cir-
cuit high input

An excessively high voltage from the APP sensor
1 is sent to ECM.

IDX

DTC P2122, P2123 APP SENSOR

Component Description

EC-643

FAIL-SAFE MODE

=NHEC1440S01

When the malfunction is detected, ECM enters in fail-safe mode and the MIL lights up.

Engine operation condition in fail-safe mode

The ECM controls the electric throttle control actuator in regulating the throttle opening in order for the idle position to be within
+10 degrees.
The ECM regulates the opening speed of the throttle valve to be slower than the normal condition.
So, the acceleration will be poor.

DTC Confirmation Procedure

NHEC1441

NOTE:
If “DTC Confirmation Procedure” has been previously conducted,
always turn ignition switch “OFF” and wait at least 10 seconds
before conducting the next test.
TESTING CONDITION:
Before performing the following procedure, confirm that bat-
tery voltage is more than 10V at idle.

SEF058Y

With CONSULT-II

Turn ignition switch “ON”.

Select “DATA MONITOR” mode with CONSULT-II.

Start engine and let it idle for 1 second.

If DTC is detected, go to “Diagnostic Procedure”, EC-646.

With GST

Follow the procedure “WITH CONSULT-II” above.

DTC P2122, P2123 APP SENSOR

On Board Diagnosis Logic (Cont’d)

EC-644

Specification 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

COLOR

ITEM

CONDITION

DATA (DC Voltage)

Sensor ground

[Engine is running]

쐌

Warm-up condition

쐌

Idle speed

Approximately 0V

Accelerator pedal posi-
tion sensor 2 power
supply

[Ignition switch “ON”]

Approximately 2.5V

B/P

Accelerator pedal posi-
tion sensor 2 ground

[Ignition switch “ON”]

Approximately 0V

Accelerator pedal posi-
tion sensor 1

[Ignition switch “ON”]

쐌

Engine stopped

쐌

Shift lever: “D”

쐌

Accelerator pedal released

0.41 - 0.71V

[Ignition switch “ON”]

쐌

Engine stopped

쐌

Shift lever: “D”

쐌

Accelerator pedal fully depressed

More than 3.7V

W/B

Accelerator pedal posi-
tion sensor 2

[Ignition switch “ON”]

쐌

Engine stopped

쐌

Shift lever: “D”

쐌

Accelerator pedal released

0.08 - 0.48V

[Ignition switch “ON”]

쐌

Engine stopped

쐌

Shift lever: “D”

쐌

Accelerator pedal fully depressed

More than 1.8V

111

Sensor power supply

[Ignition switch “ON”]

Approximately 5V

Diagnostic Procedure

NHEC1391

RETIGHTEN GROUND SCREWS

1. Turn ignition switch “OFF”.
2. Loosen and retighten engine ground screws.

SEC047D

䊳

GO TO 2.

DTC P2122, P2123 APP SENSOR

Wiring Diagram (Cont’d)

EC-646

CHECK APP SENSOR 1 POWER SUPPLY CIRCUIT

1. Disconnect accelerator pedal position (APP) sensor harness connector.
2. Turn ignition switch “ON”.

SEC081D

3. Check voltage between APP sensor terminals 6 and ground with CONSULT-II or tester.

SEC093D

Voltage: Approximately 5V

OK or NG

䊳

GO TO 4.

䊳

GO TO 3.

DETECT MALFUNCTIONING PART

Check the following.

쐌

Harness connectors M229, F66

쐌

Harness for open or short between ECM and accelerator pedal position sensor

䊳

Repair open circuit or short to ground or short to power in harness or connectors.

CHECK APP SENSOR 1 GROUND CIRCUIT FOR OPEN AND SHORT

1. Turn ignition switch “OFF”.
2. Check harness continuity between APP sensor terminal 3 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

䊳

GO TO 6.

䊳

GO TO 5.

IDX

DTC P2122, P2123 APP SENSOR

Diagnostic Procedure (Cont’d)

EC-647

DETECT MALFUNCTIONING PART

Check the following.

쐌

Harness connectors M229, F66

쐌

Joint connector-20

쐌

Harness for open or short between ECM and accelerator pedal position sensor

䊳

Repair open circuit or short to ground or short to power in harness or connectors.

CHECK APP SENSOR 1 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1. Disconnect ECM harness connector.
2. Check harness continuity between ECM terminal 73 and APP sensor terminal 5.

Refer to Wiring Diagram

Continuity should exist.

3. Also check harness for short to ground and short to power.

OK or NG

䊳

GO TO 8.

䊳

GO TO 7.

DETECT MALFUNCTIONING PART

Check the following.

쐌

Harness connectors M229, F66

쐌

Harness for open or short between ECM and accelerator pedal position sensor

䊳

Repair open circuit or short to ground or short to power in harness or connectors.

CHECK APP SENSOR

Refer to “Component Inspection”, EC-649.

OK or NG

䊳

GO TO 9.

䊳

Replace accelerator pedal assembly.

CHECK INTERMITTENT INCIDENT

Refer to “TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT”, EC-151.

䊳

IINSPECTION END

DTC P2122, P2123 APP SENSOR

Diagnostic Procedure (Cont’d)

EC-648

SEC901C

Component Inspection

=NHEC1442

ACCELERATOR PEDAL POSITION SENSOR
1.

Reconnect all harness connectors disconnected.

Turn ignition switch “ON”.

Check voltage between ECM terminals 73 (APP sensor 1
signal), 74 (APP sensor 2 signal) and engine ground under the
following conditions.

Terminal

Accelerator pedal

Voltage

73
(Accelerator pedal posi-
tion sensor 1)

Released

0.41 - 0.71V

Fully depressed

More than 3.7V

74
(Accelerator pedal posi-
tion sensor 2)

Released

0.08 - 0.48V

Fully depressed

More than 1.8V

If NG, replace accelerator pedal assembly.

Perform “Accelerator Pedal Released Position Learning”,
EC-71.

Perform “Throttle Valve Closed Position Learning”, EC-71.

Perform “Idle Air Volume Learning”, EC-71.

IDX

DTC P2122, P2123 APP SENSOR

Component Inspection

EC-649

PBIB1741E

Component Description

NHEC1347

CONSULT-II Reference Value in Data Monitor
Mode

NHEC1348

Specification data are reference values.

MONITOR ITEM

CONDITION

SPECIFICATION

ACCEL SEN1

쐌

Ignition switch: ON (engine
stopped)

쐌

Shift lever: “D”

Accelerator pedal: Released

0.41 - 0.71V

Accelerator pedal: Fully depressed

More than 3.7V

ACCEL SEN2*

쐌

Ignition switch: ON (engine
stopped)

쐌

Shift lever: “D”

Accelerator pedal: Released

0.15 - 0.97V

Accelerator pedal: Fully depressed

More than 3.5V

CLSD THL POS

쐌

Ignition switch: ON
(engine stopped)

쐌

Shift lever: “D”

Accelerator pedal: Released

Accelerator pedal: Slightly
depressed

OFF

*: Accelerator pedal position sensor 2 signal is converted by ECM internally. Thus, it differs from ECM terminal voltage signal.

On Board Diagnosis Logic

NHEC1457

These self-diagnoses have the one trip detection logic.

DTC No.

Trouble diagnosis

name

DTC Detecting Condition

Possible Cause

P2127
2127

Accelerator pedal
position sensor 2 cir-
cuit low input

An excessively low voltage from the APP sensor 2
is sent to ECM.

쐌

Harness or connectors
(The APP sensor 2 circuit is open or
shorted.)

쐌

Accelerator pedal position sensor
(Accelerator pedal position sensor 2)

P2128
2128

Accelerator pedal
position sensor 2 cir-
cuit high input

An excessively high voltage from the APP sensor
2 is sent to ECM.

DTC P2127, P2128 APP SENSOR

Component Description

EC-650

FAIL-SAFE MODE

=NHEC1457S01

When the malfunction is detected, ECM enters fail-safe mode and the MIL lights up.

Engine operating condition in fail-safe mode

DTC Confirmation Procedure

NHEC1458

SEF058Y

With CONSULT-II

Turn ignition switch “ON”.

Select “DATA MONITOR” mode with CONSULT-II.

Start engine and let it idle for 1 second.

If DTC is detected, go to “Diagnostic Procedure”, EC-653.

With GST

Follow the procedure “With CONSULT-II” above.

IDX

DTC P2127, P2128 APP SENSOR

On Board Diagnosis Logic (Cont’d)

EC-651

Specification 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

COLOR

ITEM

CONDITION

DATA (DC Voltage)

Sensor ground

[Engine is running]

쐌

Warm-up condition

쐌

Idle speed

Approximately 0V

Accelerator pedal posi-
tion sensor 2 power
supply

[Ignition switch “ON”]

Approximately 2.5V

B/P

Accelerator pedal posi-
tion sensor 2 ground

[Ignition switch “ON”]

Approximately 0V

Accelerator pedal posi-
tion sensor 1

[Ignition switch “ON”]

쐌

Engine stopped

쐌

Shift lever: “D”

쐌

Accelerator pedal released

0.41 - 0.71V

[Ignition switch “ON”]

쐌

Engine stopped

쐌

Shift lever: “D”

쐌

Accelerator pedal fully depressed

More than 3.7V

W/B

Accelerator pedal posi-
tion sensor 2

[Ignition switch “ON”]

쐌

Engine stopped

쐌

Shift lever: “D”

쐌

Accelerator pedal released

0.08 - 0.48V

[Ignition switch “ON”]

쐌

Engine stopped

쐌

Shift lever: “D”

쐌

Accelerator pedal fully depressed

More than 1.8V

111

Sensor power supply

[Ignition switch “ON”]

Approximately 5V

Diagnostic Procedure

NHEC1352

RETIGHTEN GROUND SCREWS

1. Turn ignition switch “OFF”.
2. Loosen and retighten engine ground screws.

SEC047D

䊳

GO TO 2.

IDX

DTC P2127, P2128 APP SENSOR

Wiring Diagram (Cont’d)

EC-653

CHECK APP SENSOR 2 POWER SUPPLY CIRCUIT

1. Disconnect accelerator pedal position (APP) sensor harness connector.
2. Turn ignition switch “ON”.

SEC081D

3. Check voltage between APP sensor terminal 4 and ground with CONSULT-II or tester.

SEC094D

Voltage: Approximately 2.5V

OK or NG

䊳

GO TO 4.

䊳

GO TO 3.

DETECT MALFUNCTIONING PART

Check the following.

쐌

Harness connectors M223, F53

쐌

Harness for open or short between ECM and accelerator pedal position sensor

䊳

Repair open circuit or short to ground or short to power in harness or connectors.

CHECK APP SENSOR 2 GROUND CIRCUIT FOR OPEN AND SHORT

1. Turn ignition switch “OFF”.
2. Check harness continuity between APP sensor 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

䊳

GO TO 6.

䊳

GO TO 5.

DETECT MALFUNCTIONING PART

Check the following.

쐌

Harness connectors M229, F66

쐌

Harness for open or short between ECM and accelerator pedal position sensor

䊳

Repair open circuit or short to ground or short to power in harness or connectors.

DTC P2127, P2128 APP SENSOR

Diagnostic Procedure (Cont’d)

EC-654

CHECK APP SENSOR 2 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1. Disconnect ECM harness connector.
2. Check harness continuity between ECM terminal 74 and APP sensor terminal 2.

Refer to Wiring Diagram.

Continuity should exist.

3. Also check harness for short to ground and short to power.

OK or NG

䊳

GO TO 8.

䊳

GO TO 7.

DETECT MALFUNCTIONING PART

Check the following.

쐌

Harness connectors M229, F66

쐌

Harness for open or short between ECM and accelerator pedal position sensor

䊳

Repair open circuit or short to ground or short to power in harness or connectors.

CHECK APP SENSOR

Refer to “Component Inspection”, EC-655.

OK or NG

䊳

GO TO 9.

䊳

Replace accelerator pedal assembly.

CHECK INTERMITTENT INCIDENT

Refer to “TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT”, EC-151.

䊳

INSPECTION END

SEC901C

Component Inspection

NHEC1459

ACCELERATOR PEDAL POSITION SENSOR
1.

Reconnect all harness connectors disconnected.

Turn ignition switch “ON”.

Check voltage between ECM terminals 73 (APP sensor 1
signal), 74 (APP sensor 2 signal) and engine ground under the
following conditions.

Terminal

Accelerator pedal

Voltage

73
(Accelerator pedal posi-
tion sensor 1)

Released

0.41 - 0.71V

Fully depressed

More than 3.7V

74
(Accelerator pedal posi-
tion sensor 2)

Released

0.08 - 0.48V

Fully depressed

More than 1.8V

If NG, replace accelerator pedal assembly.

Perform “Accelerator Pedal Released Position Learning”,
EC-71.

Perform “Throttle Valve Closed Position Learning”, EC-71.

Perform “Idle Air Volume Learning”, EC-71.

IDX

DTC P2127, P2128 APP SENSOR

Diagnostic Procedure (Cont’d)

EC-655

PBIB0145E

Component Description

NHEC1365

Electric throttle control actuator consists of throttle control motor,
throttle position sensor, etc. The throttle position sensor responds
to the throttle vale movement.
The throttle position sensor has the two sensors. These sensors
are a kind of potentiometers which transform the throttle valve
position into output voltage, and emit the voltage signal to the ECM.
In addition, these sensors detect the opening and closing speed of
the throttle valve and feed the voltage signals to the ECM. The
ECM judges the current opening angle of the throttle valve form
these signal and the ECM controls the throttle control motor to
make the throttle valve opening angle properly in response to driv-
ing condition.

CONSULT-II Reference Value in Data Monitor
Mode

NHEC1366

Specification data are reference values.

MONITOR ITEM

CONDITION

SPECIFICATION

THRTL SEN1
THRTL SEN2*

쐌

Ignition switch:
ON (Engine stopped)

쐌

Shift lever: D

Accelerator pedal: Released

More than 0.36V

Accelerator pedal: Fully depressed

Less than 4.75V

*: Throttle position sensor 2 signal is converted by ECM internally. Thus, it differs from ECM terminal voltage signal.

On Board Diagnosis Logic

NHEC1434

This self-diagnosis has the one trip detection logic.

DTC No.

Trouble diagnosis

name

DTC Detecting Condition

Possible Cause

P2135
2135

Throttle position sen-
sor circuit range/
performance problem

Rationally incorrect voltage is sent to ECM com-
pared with the signals from TP sensor 1 and TP
sensor 2.

쐌

Harness or connector
(The TP sensor 1 and 2 circuit is
open or shorted.)

쐌

Electric throttle control actuator (TP
sensor 1 and 2)

FAIL-SAFE MODE

NHEC1434S01

When the malfunction is detected, the ECM enters fail-safe mode and the MIL lights up.

Engine operation condition in fail-safe mode

DTC P2135 TP SENSOR

Component Description

EC-656

Infiniti I30. Emission Control System (2003 year). Manual - part 41