Nissan Terrano r20e. Instruction — part 202
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-444 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-444 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-445
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-446
Wiring Diagram
YEC250A
DTC P1620 ECM RLY
TD27Ti
EC-447
Diagnostic Procedure
INSPECTION START
CHECK ECM POWER SUPPLY CIRCUIT.
1. Turn ignition switch “OFF”.
2. Disconnect ECM relay.
3. Check voltage between ECM terminals
q
1
,
q
3
and ground with CONSULT-II or
tester.
Voltage: Battery voltage
OK
E
NG
Check the following.
I
20A fuse
I
Harness for open and
short between ECM
relay and battery
If NG, repair open circuit or
short to ground or short to
power in harness or con-
nectors.
CHECK ECM INPUT SIGNAL CIRCUIT
FOR OPEN AND SHORT
1. Turn ignition switch “OFF”.
2. Disconnect ECM harness connector.
3. Check harness continuity between ECM
terminals
107
,
108
,
109
and ECM
relay terminal
q
5
. Refer to Wiring Dia-
gram.
Continuity should exist.
4. Also check harness for short to ground
and short to power.
OK
E
NG
Check the following.
I
Harness connectors
M787
,
F66
(LHD mod-
els)
I
Harness for open or
short between ECM
relay and ECM
If NG, repair harness or
connectors.
CHECK ECM OUTPUT SIGNAL CIRCUIT
FOR OPEN AND SHORT.
1. Check harness continuity between ECM
terminal
325
and ECM relay terminal
q
2
. Refer to Wiring Diagram.
Continuity should exist.
2. Also check harness for short to ground
and short to power.
OK
E
NG
Check the following.
I
Harness connectors
M787
,
F66
(LHD mod-
els)
I
Harness for open or
short between ECM
relay and ECM
If NG, repair harness or
connectors.
CHECK ECM RELAY
1. Apply 12V direct current between ECM
relay terminals
q
1
and
q
2
.
2. Check continuity between ECM relay
terminals
q
3
and
q
5
.
12V (
q
1
-
q
2
) applied: Continuity should
exist
No voltage applied: No continuity
OK
E
NG
Replace ECM relay.
Check ECM pin terminals for damage and
check the connection of ECM harness
connector.
INSPECTION END
YEC283A
MEC945D
NEF350
H
H
H
H
H
H
DTC P1620 ECM RLY
TD27Ti
EC-448
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