Nissan Terrano model r20 series 2004. Instruction — part 186
Diagnostic Procedure
INSPECTION START
(Air conditioner relay signal circuit)
CHECK POWER SUPPLY.
1. Turn ignition switch to “LOCK” position.
2. Disconnect air conditioner relay har-
ness connector.
3. Check voltage between air conditioner
relay connector terminal
q
2
,
q
3
and
engine ground.
Voltage: Battery voltage
OK
E
NG
Check the following:
I
10A fuse
I
Harness for open or
short between fuse block
and A/C relay
If NG, replace or repair the
parts attached.
CHECK INPUT SIGNAL CIRCUIT.
1. Turn ignition switch to “LOCK” position.
2. Disconnect ECM harness connector.
3.Check harness continuity between ECM
harness connector terminal
204
and air
conditioner relay harness connector ter-
minal
q
1
. Refer to wiring diagram.
Continuity should exist.
If OK, check harness for short-
circuit.
OK
E
NG
Check the following:
I
Harness connectors
M812
,
F120
(LHD mod-
els)
I
Harness for open or
short-circuit between
ECM and air conditioner
relay.
If NG, repair harness or
connectors.
CHECK AIR CONDITIONER RELAY.
Refer to HA section for inspection.
OK
E
NG
Replace air conditioner
relay.
Disconnect and reconnect harness
connectors in the circuit. Then retest.
Trouble is not fixed
Check ECM pin terminals for damage and
check the connection of ECM harness
connector. Reconnect ECM harness con-
nector and retest.
INSPECTION END
NEF512
PBIB0185E
H
H
H
H
H
H
DTC P1530 AIR CONDITIONER RLY
TD27Ti
EC-466
Description
The ECM consists of a microcomputer and connectors for signal
input and output and for power supply. The unit controls the engine.
On Board Diagnosis Logic
DTC
Malfunction is detected when ...
Check Items (Possible Cause)
P1603
0901
I
ECM calculation function is malfunctioning.
I
ECM
P1607
0301
DTC Confirmation Procedure
WITH CONSULT-II
1) Turn ignition switch “ON”.
2) Select “DATA MONITOR” mode with CONSULT-II.
3) Start engine and wait at least 2 seconds.
WITHOUT CONSULT-II
1) Turn ignition switch “ON” and wait at least 2 seconds.
2) Start engine and wait at least 2 seconds.
3) Turn ignition switch “OFF”, wait at least 5 seconds and then turn
“ON”.
4) Perform “Diagnostic Test Mode II (Self-diagnostic results)” with
ECM.
SEC220B
SEF817Y
DTC PD1603 ECM 12, DTC P1607 ECM2
TD27Ti
EC-467
Diagnostic Procedure
INSPECTION START
With CONSULT-II
1. Turn ignition switch “ON”.
2. Select “SELF DIAG RESULTS” mode
with CONSULT-II.
3. Touch “ERASE”.
4. Perform “DTC Confirmation Procedure”,
EC-467 again.
5. Is the DTC P1603 or P1607 displayed
again?
Without CONSULT-II
1. Turn ignition switch “ON”.
2. Erase the Diagnostic Test Mode II (Self-
diagnostic results) memory.
3. Perform “DTC Confirmation Procedure”,
EC-467 again.
4. Perform “Diagnostic Test Mode II (Self-
diagnostic results)”.
5. Is the DTC 0301 or 0901 displayed
again?
No
E
Yes
Replace ECM.
INSPECTION END
H
H
DTC PD1603 ECM 12, DTC P1607 ECM2
TD27Ti
EC-468
On Board Diagnosis Logic
DTC
Malfunction is detected when .
Check Items (Possible Cause)
P1620
0902
I
An irregular voltage signal from the ECM relay is sent
to ECM.
I
Harness or connectors
(ECM relay circuit is open or shorted.)
I
ECM relay
DTC Confirmation Procedure
WITH CONSULT-II
1) Turn ignition switch “ON”.
2) Select “DATA MONITOR” mode with CONSULT-II.
3) Turn ignition switch “OFF”, wait at least 20 seconds and then
turn “ON”.
WITHOUT CONSULT-II
1) Turn ignition switch “ON”.
2) Turn ignition switch “OFF”, wait at least 20 seconds and then
turn “ON”.
3) Perform “Diagnostic Test Mode II (Self-diagnostic results)” with
ECM.
SEF817Y
DTC P1620 ECM RLY
TD27Ti
EC-469
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