Nissan Frontier D22. Manual - part 242

TROUBLE DIAGNOSIS

EC-71

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EC

DIAGNOSTIC WORKSHEET

There are many operating conditions that lead to the malfunction of
engine components. A good grasp of such conditions can make trou-
ble-shooting faster and more accurate.
In general, each customer feels differently about an incident. It is
important to fully understand the symptoms or conditions for a cus-
tomer complaint.
Utilize a diagnostic worksheet like the one on 

EC-71, "Worksheet

Sample"

  in order to organize all the information for troubleshooting.

Some conditions may cause the MIL to come on steady or blink and
DTC to be detected. Examples:

●

Vehicle ran out of fuel, which caused the engine to misfire.

●

Fuel filler cap was left off or incorrectly screwed on, allowing fuel
to evaporate into the atmosphere.

Worksheet Sample

SEF907L

LEC031A

EC-72

[KA24DE]

TROUBLE DIAGNOSIS

DTC Inspection Priority Chart

UBS00D1D

If some DTCs are displayed at the same time, perform inspections one by one based on the following priority
chart.

Priority

Detected items (DTC)

1

●

P0101, P0102, P0103 MAF sensor

●

P0112, P0113, P0127 IAT sensor

●

P0117, P0118, P0125 ECT sensor

●

P0121, P0122, P0123 TP sensor

●

P0128 Thermostat function

●

P0181, P0182, P0183 FTT sensor

●

P0327, P0328 KS

●

 P0340 CMP sensor

●

P0460, P0461, P0462, P0463, P1464 Fuel level sensor

●

P0500 VSS

●

P0605 ECM

●

P1400 EGRC-solenoid valve

●

P1706 PNP switch

2

●

P0031, P0032 HO2S1 heater

●

P0037, P0038 HO2S2 heater

●

P0132, P0133, P0134, P1143, P1144 HO2S1

●

P0138, P0139, P1146, P1147 HO2S2

●

P0335, P1336 CKP sensor

●

P0405, P0406 EGRT sensor

●

P0441 EVAP control system purge flow monitoring

●

P0444, P0445, P1444 EVAP canister purge volume control solenoid valve

●

P0447, P1446, P1448 EVAP canister vent control valve

●

P0452, P0453 EVAP control system pressure sensor

●

P0510 CTP switch

●

P1442 EVAP control system (SMALL LEAK)

●

P1490, P1491 Vacuum cut valve bypass valve

●

P1775, P1776 TCC solenoid valve

3

●

P0171, P0172 Fuel injection system function

●

P0300 - P0304 Misfire

●

P0400, P1402 EGR function

●

P0402 EGRC-BPT valve

●

P0420 Three way catalyst function

●

P0442 EVAP control system (SMALL LEAK)

●

P0455 EVAP control system (GROSS LEAK)

●

P0456, P1456 EVAP control system (VERY SMALL LEAK)

●

P0505, P0506, P507 ISC system

●

P1148 Closed loop control

TROUBLE DIAGNOSIS

EC-73

[KA24DE]

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EC

Fail-safe Chart

UBS00D1E

The ECM enters fail-safe mode if any of the following malfunctions is detected due to the open or short circuit.
When the ECM enters the fail-safe mode, the MIL illuminates.

DTC No.

Detected items

Engine operating condition in fail-safe mode

CONSULT-II

GST

P0102
P0103

Mass air flow sensor circuit

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

P0112
P0113

Intake air temperature sen-
sor

The ECM functions on the assumption that the intake air temperature is 25

°C (77°F).

P0117
P0118

Engine coolant temperature 
sensor circuit

Engine coolant temperature will be determined by ECM based on the time after turning 
ignition switch to ON or START.
CONSULT-II displays the engine coolant temperature decided by ECM.

Condition

Engine coolant temperature decided (CONSULT-II 

display)

Just as ignition switch is turned to 
ON or START

40

°C (104°F)

More than approx. 4 minutes after 
ignition ON or START

80

°C (176°F)

Except as shown above

40 - 80

°C (104 - 176°F)

(Depends on the time)

P0122
P0123

Throttle position sensor cir-
cuit

Throttle position will be determined based on the injected fuel amount and the engine 
speed. Therefore, acceleration will be poor.

 Condition

Driving condition

When engine is idling

Normal

When accelerating

Poor acceleration

Unable to 

access ECM

ECM

ECM fail-safe activating condition
The computing function of the ECM was judged to be malfunctioning.
When the fail-safe system activates (i.e., if the ECM detects a malfunction condition in 
the CPU of ECM), the MIL on the instrument panel lights to warn the driver.
However it is not possible to access ECM and DTC cannot be confirmed.
Engine control with fail-safe
When ECM fail-safe is operating, fuel injection, ignition timing, fuel pump operation and 
IACV-AAC valve operation are controlled under certain limitations.

ECM fail-safe operation

Engine speed

Engine speed will not rise more than 3,000 rpm

Fuel injection

Simultaneous multiport fuel injection system

Ignition timing

Ignition timing is fixed at the preset valve

 Fuel pump

Fuel pump relay is “ON” when engine is running 

and “OFF” when engine stalls

IACV-AAC valve

Full open

Replace ECM, if ECM fail-safe condition is confirmed.

EC-74

[KA24DE]

TROUBLE DIAGNOSIS

Basic Inspection

UBS00D1F

1. 

INSPECTION START

1.

Check service records for any recent repairs that may indicate a related malfunction, or a current need for
scheduled maintenance.

2.

Open engine hood and check the following:

–

Harness connectors for improper connections

–

Wiring harness for improper connections, pinches and cut

–

Vacuum hoses for splits, kinks and improper connections

–

Hoses and ducts for leaks

–

Air cleaner clogging

–

Gasket

3.

Confirm that electrical or mechanical loads are not applied.

–

Headlamp switch is OFF.

–

Air conditioner switch is OFF.

–

Rear window defogger switch is OFF.

–

Steering wheel is in the straight-ahead position, etc.

4.

Start engine and warm it up until engine coolant temperature
indicator points the middle of gauge.
Ensure engine stays below 1,000 rpm.

5.

Run engine at about 2,000 rpm for about 2 minutes under no
load.

6.

Make sure that no DTC is displayed with CONSULT-II or GST.

OK or NG

OK (With CONSULT-II) >> GO TO 2.
OK (With GST)             >> GO TO 4.
NG       >>  Repair or replace components as necessary according

to corresponding Diagnostic Procedure.

2. 

CONNECT CONSULT-II TO THE VEHICLE

Connect “CONSULT-II” and CONSULT-II CONVERTER to the data
link connector and select “ENGINE” from the menu. Refer to 

EC-

101, "INSPECTION PROCEDURE"

 .

>> GO TO 3.

SEF983U

SEF810K

SEF977U

LEC104A