Nissan Frontier D22. Instruction — part 595
DTC P0340 CMP SENSOR
EC-1483
[VG33ER]
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EC
4.
CHECK CMP SENSOR INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1.
Turn ignition switch OFF.
2.
Disconnect ECM harness connector.
3.
Check harness continuity between CMP sensor terminal 4 and ECM terminal 49, CMP sensor terminal 3
and ECM terminals 44, 48. Refer to Wiring Diagram.
4.
Also check harness for short to ground and short to power.
OK or NG
OK
>> GO TO 5
NG
>> Repair open circuit or short to ground or short to power in harness or connectors.
5.
CHECK CMP SENSOR GROUND CIRCUIT FOR OPEN AND SHORT
1.
Turn ignition switch OFF.
2.
Check harness continuity between CMP sensor terminal 6 and engine ground.
3.
Also check harness for short to power.
OK or NG
OK
>> GO TO 7.
NG
>> GO TO 6.
6.
DETECT MALFUNCTIONING PART
Check the following.
●
Harness for open between camshaft position sensor and engine ground
>> Repair open circuit or short to power in harness or connector.
Continuity should exist.
Continuity should exist.
EC-1484
[VG33ER]
DTC P0340 CMP SENSOR
7.
CHECK CAMSHAFT POSITION SENSOR
1.
Install any parts removed.
2.
Start engine.
3.
Check voltage between ECM terminals 44, 48 and ground, ECM
terminal 49 and ground with DC range.
<Terminal 44 or 48 and engine ground>
<Terminal 49 and engine ground>
OK or NG
OK
>> GO TO 8.
NG
>> Replace distributor assembly with camshaft position sensor.
8.
CHECK INTERMITTENT INCIDENT
EC-1297, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"
.
>> INSPECTION END.
Removal and Installation
UBS00DXA
DISTRIBUTOR
EM-80, "OUTER COMPONENT PARTS"
Condition
Idle
2,000 rpm
Voltage
0.3 - 0.5V
0.3 - 0.5V
Pulse sig-
nal
Condition
Idle
2,000 rpm
Voltage
Approximately 2.5V
Approximately 2.5V
Pulse sig-
nal
PBIB1424E
SEF997U
SEF998U
SEF999U
SEF001V
DTC P0420, P0430 THREE WAY CATALYST FUNCTION
EC-1485
[VG33ER]
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DTC P0420, P0430 THREE WAY CATALYST FUNCTION
PFP:20905
On Board Diagnosis Logic
UBS00DXB
The ECM monitors the switching frequency ratio of heated oxygen
sensors 1 and 2.
A three way catalyst (Manifold) with high oxygen storage capacity
will indicate a low switching frequency of heated oxygen sensor 2.
As oxygen storage capacity decreases, the heated oxygen sensor 2
switching frequency will increase.
When the frequency ratio of heated oxygen sensors 1 and 2
approaches a specified limit value, the three way catalyst (Manifold)
malfunction is diagnosed.
DTC Confirmation Procedure
UBS00DXC
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.
WITH CONSULT-II
TESTING CONDITION
●
Do not hold engine speed for more than the specified minutes below.
1.
Start engine and warm it up to the normal operating temperature.
2.
Turn ignition switch OFF and wait at least 5 seconds.
3.
Start engine and keep the engine speed at between 3,500 and 4,000 rpm for at least 1 minute under no
load.
4.
Let engine idle for 1 minute.
5.
Open engine hood.
6.
Select “DTC & SRT CONFIRMATION” then “SRT WORK SUP-
PORT” mode with CONSULT-II.
7.
Rev engine up to 2,000 to 3,000 rpm and hold it for 3 consecu-
tive minutes then release the accelerator pedal completely.
If “INCMP” of “CATALYST” changed to “COMPLT”, go to step
10.
8.
Wait 5 seconds at idle.
SEF484YF
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P0420
(Bank 1)
Catalyst system effi-
ciency below threshold
●
Three way catalyst (Manifold) does not oper-
ate properly.
●
Three way catalyst (Manifold) does not have
enough oxygen storage capacity.
●
Three way catalyst (Manifold)
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Exhaust tube
●
Intake air leaks
●
Fuel injector
●
Fuel injector leaks
●
Spark plug
●
Improper ignition timing
P0430
(Bank 2)
SEF344Z
EC-1486
[VG33ER]
DTC P0420, P0430 THREE WAY CATALYST FUNCTION
9.
Rev engine up to 2,000 to 3,000 rpm and maintain it until
“INCMP” of “CATALYST” changes to “CMPLT” (It will take
approximately 5 minutes).
If not “CMPLT”, perform the following.
10. Select “SELF-DIAG RESULTS” mode with CONSULT-II.
11. Confirm that the 1st trip DTC is not detected.
If the 1st trip DTC is detected, go to
Overall Function Check
UBS00DXD
Use this procedure to check the overall function of the three way catalyst (manifold). During this check, a DTC
might not be confirmed.
CAUTION:
Always drive vehicle at a safe speed.
WITH GST
1.
Start engine and warm it up to the normal operation temperature.
2.
Turn ignition switch OFF and wait at least 10 seconds.
3.
Start engine and keep the engine speed at between 3,500 and 4,000 rpm for at least 1 minute under no
load.
4.
Let engine idle for 1 minute.
5.
Set voltmeters probes between ECM terminals 50 [HO2S1
(bank 1) signal], 51 [HO2S1 (bank 2) signal] and engine ground,
and ECM terminals 56 [HO2S2 (bank 1) signal], 57 [HO2S2
(bank 2) signal] and engine ground.
6.
Keep engine speed at 2,000 rpm constant under no load.
SEF345Z
SEF560X
SEF441V
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