Nissan Frontier D22. Manual — part 550
POWER SUPPLY CIRCUIT FOR ECM
EC-1303
[VG33ER]
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EC
13.
CHECK ECM RELAY
1.
Apply 12V direct current between relay terminals 1 and 2.
2.
Check continuity between relay terminals 3 and 5.
OK or NG
OK
>> GO TO 14.
NG
>> Replace ECM relay.
14.
CHECK ECM GROUND CIRCUIT-II FOR OPEN AND SHORT
1.
Turn ignition switch OFF.
2.
Disconnect ECM harness connector.
3.
Check harness continuity between ECM terminals 10, 19, 25, 32, 116, 124 and engine ground.
Refer to Wiring Diagram.
4.
Also check harness for short to power.
OK or NG
OK
>> GO TO 15.
NG
>> GO TO 5.
15.
CHECK INTERMITTENT INCIDENT
Refer to
EC-1297, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"
>> INSPECTION END.
12V (1 - 2) applied
: Continuity exists.
No voltage applied
: No continuity
SEF090M
Continuity should exist.
EC-1304
[VG33ER]
DTC P0031, P0032, P0051, P0052 HO2S1 HEATER
DTC P0031, P0032, P0051, P0052 HO2S1 HEATER
PFP:22690
Description
UBS00DSO
SYSTEM DESCRIPTION
The ECM performs ON/OFF control of the heated oxygen sensor 1 heaters corresponding to the engine
speed.
OPERATION
CONSULT-II Reference Value in Data Monitor Mode
UBS00DSP
Specification data are reference values.
On Board Diagnosis Logic
UBS00DSQ
DTC Confirmation Procedure
UBS00DSR
NOTE:
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 5 seconds before conducting the next test.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is between 10.5V and 16V at
idle.
WITH CONSULT-II
1.
Turn ignition switch ON and select “DATA MONITOR” mode with
CONSULT-II.
2.
Start engine and run it for at least 6 seconds at idle speed.
3.
If 1st trip DTC is detected, go to
Sensor
Input Signal to ECM
ECM function
Actuator
Camshaft position sensor
Engine speed
Heated oxygen sensor 1
heater control
Heated oxygen sensor 1 heaters
Engine speed
rpm
Heated oxygen sensor 1 heaters
Above 2,800
OFF
Below 2,800
ON
MONITOR ITEM
CONDITION
SPECIFICATION
HO2S1 HTR (B1)
HO2S1 HTR (B2)
●
Engine speed: Below 2,800 rpm
ON
●
Engine speed: Above 2,800 rpm
OFF
DTC No.
Trouble diagnosis
name
DTC detecting condition
Possible cause
P0031
(Bank 1)
Heated oxygen
sensor 1 heater
control circuit low
The current amperage in the heated oxygen
sensor 1 heater circuit is out of the normal
range.
(An excessively low voltage signal is sent to
ECM through the heated oxygen sensor 1
heater.)
●
Harness or connectors
(The heated oxygen sensor 1 heater circuit is
open or shorted.)
●
Heater oxygen sensor 1 heater
P0051
(Bank 2)
P0032
(Bank 1)
Heated oxygen
sensor 1 heater
control circuit high
The current amperage in the heated oxygen
sensor 1 heater circuit is out of the normal
range.
(An excessively high voltage signal is sent to
ECM through the heated oxygen sensor 1
heater.)
●
Harness or connectors
(The heated oxygen sensor 1 heater circuit is
shorted.)
●
Heater oxygen sensor 1 heater
P0052
(Bank 2)
SEF058Y
DTC P0031, P0032, P0051, P0052 HO2S1 HEATER
EC-1305
[VG33ER]
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EC
WITH GST
1.
Start engine and run it for at least 6 seconds at idle speed.
2.
Turn ignition switch OFF, wait at least 5 seconds and then turn ON.
3.
Start engine and run it for at 6 seconds at idle speed.
4.
Select MODE 3 with GST.
5.
If DTC is detected, go to
EC-1309, "Diagnostic Procedure"
●
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) concerning this diagnosis. There-
fore, using CONSULT-II is recommended.
EC-1306
[VG33ER]
DTC P0031, P0032, P0051, P0052 HO2S1 HEATER
Wiring Diagram
UBS00DSS
BANK 1
BBWA1077E
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