Infiniti I30. Emission Control System (2003 year). Manual - part 12

CHECK HO2S1 OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1. Turn ignition switch “OFF”.
2. Disconnect ECM harness connector.
3. Check harness continuity between ECM terminal and HO2S1 terminal as follows.

Refer to Wiring Diagram.

MTBL1140

Continuity should exist.

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

OK or NG

䊳

GO TO 4.

䊳

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

CHECK HEATED OXYGEN SENSOR 1 HEATER

Check resistance between HO2S1 terminals as follows.

SEF310XA

CAUTION:

쐌

Discard any heated oxygen sensor which has been dropped from a height of more than 0.5 m (19.7 in) onto a
hard surface such as a concrete floor; use a new one.

쐌

Before installing new oxygen sensor, clean exhaust system threads using Oxygen Sensor Thread Cleaner tool
J-43897-18 or J-43897-12 and approved anti-seize lubricant.

OK or NG

䊳

GO TO 5.

䊳

Replace malfunctioning heated oxygen sensor.

CHECK INTERMITTENT INCIDENT

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

䊳

INSPECTION END

IDX

DTC P0031, P0032, P0051, P0052 HO2S1 HEATER

Diagnostic Procedure (Cont’d)

EC-177

Description

NHEC0833

SYSTEM DESCRIPTION

NHEC0833S01

Sensor

Input Signal to ECM

ECM func-

tion

Actuator

Crankshaft position sensor (POS)
Camshaft position sensor (PHASE)

Engine speed

Heated
oxygen
sensor
heater 2
control

Heated oxygen sensor 2 heat-
ers

Engine coolant temperature sensor

Engine coolant temperature

Main air flow sensor

Amount of intake air

The ECM performs ON/OFF control of the heated oxygen sensor 2 heaters corresponding to the engine speed,
amount of intake air and engine coolant temperature.

OPERATION

NHEC0833S02

Engine speed rpm

Heated oxygen sensor 2 heaters

Above 3,600

OFF

Below 3,600 (After the following conditions are met.)

쐌

After warming up

쐌

After keeping the engine speed between 3,500 and 4,000
rpm for 1 minute and at idle for 1 minute under no load

CONSULT-II Reference Value in Data Monitor
Mode

NHEC0834

Specification data are reference values.

MONITOR ITEM

CONDITION

SPECIFICATION

HO2S2 HTR (B1)
HO2S2 HTR (B2)

쐌

Engine is running above 3,600 rpm.

OFF

쐌

Engine is running below 3,600 rpm after the following conditions are
met.

쐌

After warming up

쐌

After keeping the engine speed between 3,500 and 4,000 rpm for 1
minute and at idle for 1 minute under no load

On Board Diagnosis Logic

NHEC0836

DTC No.

Trouble diagnosis

name

DTC Detecting Condition

Possible Cause

P0037
0037
(Bank 1)
P0057
0057
(Bank 2)

Heated oxygen sen-
sor 2 heater control
circuit low

The current amperage in the heated oxygen sen-
sor 2 heater circuit is out of the normal range.
(An excessively low voltage signal is sent to ECM
through the heated oxygen sensor 2 heater.)

쐌

Harness or connectors
(The heated oxygen sensor 2 heater
circuit is open or shorted.)

쐌

Heated oxygen sensor 2 heater

P0038
0038
(Bank 1)
P0058
0058
(Bank 2)

Heated oxygen sen-
sor 2 heater control
circuit high

The current amperage in the heated oxygen sen-
sor 2 heater circuit is out of the normal range.
(An excessively high voltage signal is sent to ECM
through the heated oxygen sensor 2 heater.)

쐌

Harness or connectors
(The heated oxygen sensor 2 heater
circuit is shorted.)

쐌

Heated oxygen sensor 2 heater

DTC P0037, P0038, P0057, P0058 HO2S2 HEATER

Description

EC-178

SEF174Y

DTC Confirmation Procedure

NHEC0837

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 between 11.0V and 16V at idle.

WITH CONSULT-II

NHEC0837S01

Turn ignition switch “ON” and select “DATA MONITOR” mode
with CONSULT-II.

Start engine and warm it up to the normal operating tempera-
ture.

Turn ignition switch “OFF” and wait at least 10 seconds.

Start engine and keep the engine speed between 3,500 and
4,000 rpm for at least 1 minute under no load.

Let engine idle for 1 minute.

If 1st trip DTC is detected, go to “Diagnostic Procedure”,
EC-182.

WITH GST

NHEC0837S02

Start engine and warm it up to the normal operating tempera-
ture.

Turn ignition switch “OFF” and wait at least 10 seconds.

Start engine and keep the engine speed between 3,500 and
4,000 rpm for at least 1 minute under no load.

Let engine idle for 1 minute.

Turn ignition switch “OFF” and wait at least 10 seconds.

Start engine and keep the engine speed between 3,500 and
4,000 rpm for at least 1 minute under no load.

Let engine idle for 1 minute.

Select “MODE 3” with GST.

If DTC is detected, go to “Diagnostic Procedure”, EC-182.

쐌

When using GST, “DTC Confirmation Procedure” should
be performed twice as much as when using CONSULT-II
because GST cannot display MODE 7 (1st trip DTC) con-
cerning this diagnosis. Therefore, using CONSULT-II is
recommended.

IDX

DTC P0037, P0038, P0057, P0058 HO2S2 HEATER

DTC Confirmation Procedure

EC-179

Wiring Diagram

=NHEC0838

BANK 1

NHEC0838S01

MEC543D

SEC659DC

DTC P0037, P0038, P0057, P0058 HO2S2 HEATER

Wiring Diagram

EC-180

BANK 2

NHEC0838S02

MEC544D

SEC660DC

IDX

DTC P0037, P0038, P0057, P0058 HO2S2 HEATER

Wiring Diagram (Cont’d)

EC-181

Diagnostic Procedure

NHEC0839

CHECK HO2S2 POWER SUPPLY CIRCUIT

1. Turn ignition switch “OFF”.
2. Disconnect corresponding heated oxygen sensor 2 harness connector.

SEC134D

3. Turn ignition switch “ON”.
4. Check voltage between HO2S2 terminal 3 and ground.

SEF314X

OK or NG

䊳

GO TO 3.

䊳

GO TO 2.

DETECT MALFUNCTIONING PART

Check the following.

쐌

Harness connectors M229, F66

쐌

Fuse block (J/B) connector M19

쐌

15A fuse

쐌

Harness for open or short between heated oxygen sensor 2 and fuse

䊳

Repair harness or connectors.

DTC P0037, P0038, P0057, P0058 HO2S2 HEATER

Diagnostic Procedure

EC-182

CHECK HO2S2 OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1. Turn ignition switch “OFF”.
2. Disconnect ECM harness connector.
3. Check harness continuity between ECM terminal and HO2S2 terminal as follows.

Refer to Wiring Diagram.

MTBL1141

Continuity should exist.

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

OK or NG

䊳

GO TO 4.

䊳

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

CHECK HEATED OXYGEN SENSOR 2 HEATER

Check the resistance between HO2S2 terminals as follows.

SEF315XE

CAUTION:

쐌

Discard any heated oxygen sensor which has been dropped from a height of more than 0.5 m (19.7 in) onto a
hard surface such as a concrete floor; use a new one.

쐌

Before installing new oxygen sensor, clean exhaust system threads using Oxygen Sensor Thread Cleaner tool
J-43897-18 or J-43897-12 and approved anti-seize lubricant.

OK or NG

䊳

GO TO 5.

䊳

Replace malfunctioning heated oxygen sensor 2.

CHECK INTERMITTENT INCIDENT

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

䊳

INSPECTION END

IDX

DTC P0037, P0038, P0057, P0058 HO2S2 HEATER

Diagnostic Procedure (Cont’d)

EC-183

SEC266C

Component Description

NHEC0840

The mass air flow sensor is placed in the stream of intake air. It
measures the intake flow rate by measuring a part of the entire
intake flow. It consists of a hot film that is supplied with electric
current from the ECM. The temperature of the hot film is controlled
by the ECM a certain amount. The heat generated by the hot film
is reduced as the intake air flows around it. The more air, the
greater the heat loss.
Therefore, the ECM must supply more electric current to maintain
the temperature of the hot film as air flow increases. The ECM
detects the air flow by means of this current change.

CONSULT-II Reference Value in Data Monitor
Mode

NHEC0841

Specification data are reference values.

MONITOR ITEM

CONDITION

SPECIFICATION

MAS A/F SE-B1

쐌

Engine: After warming up

쐌

Air conditioner switch: “OFF”

쐌

Shift lever: “N”

쐌

No-load

Idle

1.1 - 1.5V

2,500 rpm

1.7 - 2.4V

CAL/LD VALUE

ditto

Idle

10 - 35%

2,500 rpm

10 - 35%

MASS AIRFLOW

ditto

Idle

2.0 - 6.0 g·m/s

2,500 rpm

7.0 - 20.0 g·m/s

On Board Diagnosis Logic

NHEC1428

This self-diagnosis has the one trip detection logic.

DTC No.

Trouble diagnosis

name

DTC Detecting Condition

Possible Cause

P0101
0101

Mass air flow sensor
circuit range/
performance problem

A high voltage from the sensor is sent to
ECM under light load driving condition.

쐌

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

쐌

Mass air flow sensor

A low voltage from the sensor is sent to
ECM under heavy load driving condition.

쐌

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

쐌

Intake air leaks

쐌

Mass air flow sensor

DTC Confirmation Procedure

NHEC0844

Perform “PROCEDURE MALFUNCTION A” first. If the DTC
cannot be confirmed, perform “PROCEDURE FOR MALFUNC-
TION B”.
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.

DTC P0101 MAF SENSOR

Component Description

EC-184

SEF174Y

PROCEDURE FOR MALFUNCTION A

NHEC0844S01

NOTE:
If engine will not start or stops soon, wait at least 10 seconds with
engine stopped (Ignition switch “ON”) instead of running engine at
idle speed.

With CONSULT-II

NHEC0844S0101

Turn ignition switch “ON”.

Select “DATA MONITOR” mode with CONSULT-II.

Start engine and warm it up to normal operating temperature.

Run engine for at least 10 seconds at idle speed.

If DTC is detected, go to “Diagnostic Procedure”, EC-188.

With GST

NHEC0844S0102

Follow the procedure “With CONSULT-II” above.

SEF243Y

PBIB0199E

PROCEDURE FOR MALFUNCTION B

NHEC0844S02

CAUTION:

Always drive vehicle at a safe speed.

With CONSULT-II

NHEC0844S0201

Turn ignition switch “ON”.

Start engine and warm it up to normal operating temperature.
If engine cannot be started, go to “Diagnostic Procedure”,
EC-188.

Select “DATA MONITOR” mode with CONSULT-II.

Check the voltage of MAS A/F SE B1 with “DATA MONITOR”.

Increases engine speed to about 4,000 rpm.

Monitor the linear voltage rise in response to engine speed
increases.
If NG, go to “Diagnostic Procedure”, EC-188.
If OK, go to following step.

Maintain the following conditions for at least 10 consecutive
seconds.

ENG SPEED

More than 2,000 rpm

THRTL SEN 1
THRTL SEN 2

More than 3V

Selector lever

Suitable position

Driving location

Driving vehicle uphill (Increased engine load)
will help maintain the driving conditions
required for this test.

If DTC is detected, go to “Diagnostic Procedure”, EC-188.

IDX

DTC P0101 MAF SENSOR

DTC Confirmation Procedure (Cont’d)

EC-185

SEF534P

Overall Function Check

NHEC0845

PROCEDURE FOR MALFUNCTION B

NHEC0845S01

Use this procedure to check the overall function of the mass air flow
sensor circuit. During this check, a DTC might not be confirmed.

With GST

NHEC0845S0101

Start engine and warm it up to normal operating temperature.

Select “MODE 1” with GST.

Check the mass air flow sensor signal with “MODE 1”.

Check for linear mass air flow sensor signal value rise in
response to increases to about 4,000 rpm in engine speed.

If NG, go to “Diagnostic Procedure”, EC-188.

DTC P0101 MAF SENSOR

Overall Function Check

EC-186

Wiring Diagram

NHEC0846

MEC531D

SEF650XE

IDX

DTC P0101 MAF SENSOR

Wiring Diagram

EC-187

Diagnostic Procedure

NHEC0847

INSPECTION START

Which malfunction (A, B) is duplicated?

MTBL1142

Type I or Type II

Type I

䊳

GO TO 3.

Type II

䊳

GO TO 2.

CHECK INTAKE SYSTEM

Check the following for connection.

쐌

Air duct

쐌

Vacuum hoses

쐌

Intake air passage between air duct to intake manifold collector

OK or NG

䊳

GO TO 3.

䊳

Reconnect the parts.

RETIGHTEN GROUND SCREWS

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

SEC047D

䊳

GO TO 4.

DTC P0101 MAF SENSOR

Diagnostic Procedure

EC-188

CHECK MAF SENSOR POWER SUPPLY CIRCUIT

1. Disconnect mass air flow (MAF) sensor harness connector.

SEC055D

2. Turn ignition switch “ON”.
3. Check voltage between MAF sensor terminals 2, 4 and ground with CONSULT-II or tester.

SEF297X

OK or NG

䊳

GO TO 6.

䊳

GO TO 5.

DETECT MALFUNCTIONING PART

Check the following.

쐌

Harness connectors E15, F18

쐌

Harness for open or short between ECM relay and mass air flow sensor

쐌

Harness for open or short between mass air flow sensor and ECM

䊳

Repair harness or connectors.

CHECK MAF SENSOR GROUND CIRCUIT FOR OPEN AND SHORT

1. Turn ignition switch “OFF”.
2. Disconnect ECM harness connector.
3. Check harness continuity between MAF sensor terminal 3 and ECM terminal 80.

Refer to Wiring Diagram.

Continuity should exist.

4. Also check harness for short to power.

OK or NG

䊳

GO TO 7.

䊳

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

IDX

DTC P0101 MAF SENSOR

Diagnostic Procedure (Cont’d)

EC-189

CHECK MAF SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1. Check harness continuity between MAF sensor terminal 1 and ECM terminal 62.

Refer to Wiring Diagram.

Continuity should exist.

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

OK or NG

䊳

GO TO 8.

䊳

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

CHECK MASS AIR FLOW SENSOR

1. Reconnect harness connectors disconnected.
2. Start engine and warm it up to normal operating temperature.
3. Check voltage between ECM terminal 62 (Mass air flow sensor signal) and ground.

SEC103D

4. If the voltage is out of specification, disconnect MAF sensor harness connector and connect it again.

Then repeat above check.

OK or NG

䊳

GO TO 9.

䊳

Replace mass air flow sensor.

CHECK INTERMITTENT INCIDENT

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

䊳

INSPECTION END

DTC P0101 MAF SENSOR

Diagnostic Procedure (Cont’d)

EC-190

SEC266C

Component Description

NHEC0746

CONSULT-II Reference Value in Data Monitor
Mode

NHEC0747

Specification data are reference values.

MONITOR ITEM

CONDITION

SPECIFICATION

MAS A/F SE-B1

쐌

Engine: After warming up

쐌

Air conditioner switch: “OFF”

쐌

Shift lever: “N”

쐌

No-load

Idle

1.1 - 1.5V

2,500 rpm

1.7 - 2.4V

CAL/LD VALUE

ditto

Idle

10 - 35%

2,500 rpm

10 - 35%

MASS AIRFLOW

ditto

Idle

2.0 - 6.0 g·m/s

2,500 rpm

7.0 - 20.0 g·m/s

On Board Diagnosis Logic

NHEC1429

These self-diagnoses have the one trip detection logic.

DTC No.

Trouble diagnosis

name

DTC Detecting Condition

Possible Cause

P0102
0102

Mass air flow sensor
circuit low input

An excessively low voltage from the sensor is sent
to ECM when engine is running.

쐌

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

쐌

Intake air leaks

쐌

Mass air flow sensor

P0103
0103

Mass air flow sensor
circuit high input

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

쐌

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

쐌

Mass air flow sensor

FAIL-SAFE MODE

NHEC1429S01

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

Detected items

Engine operating condition in fail-safe mode

Mass air flow sensor circuit

Engine speed will not rise more than 2,400 rpm due to the fuel cut.

IDX

DTC P0102, P0103 MAF SENSOR

Component Description

EC-191

DTC Confirmation Procedure

NHEC1430

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.

SEF058Y

PROCEDURE FOR DTC P0103

NHEC1430S01

With CONSULT-II

NHEC1430S0101

Turn ignition switch “ON”.

Select “DATA MONITOR” mode with CONSULT-II.

Wait at least 6 seconds.

If DTC is detected, go to “Diagnostic Procedure”, EC-194.

With GST

NHEC1430S0102

Follow the procedure “With CONSULT-II” above.

SEF058Y

PROCEDURE FOR DTC P0102

NHEC1430S02

With CONSULT-II

NHEC1430S0201

Turn ignition switch “ON”.

Select “DATA MONITOR” mode with CONSULT-II.

Start engine and wait at least 5 seconds.

If DTC is detected, go to “Diagnostic Procedure”, EC-194.

With GST

NHEC1430S0202

Follow the procedure “With CONSULT-II” above.

DTC P0102, P0103 MAF SENSOR

DTC Confirmation Procedure

EC-192

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