Nissan Terrano model r20 series 2004. Instruction — part 187
Wiring Diagram
YEC687A
DTC P1620 ECM RLY
TD27Ti
EC-470
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-471
Wiring Diagram
YEC153A
START SIGNAL
TD27Ti
EC-472
Diagnostic Procedure
INSPECTION START
CHECK OVERALL FUNCTION.
1. Turn ignition switch to “ON” posi-
tion.
2. Check “START SIGNAL” in “DATA
MONITOR” mode with CONSULT-
II.
-------------------------------------------------------------------------------------------------------------------------------------- OR --------------------------------------------------------------------------------------------------------------------------------------
1. Turn ignition switch to “START”
position.
2. Check voltage between ECM con-
nector terminal
422
and engine
ground.
Voltage:
Ignition switch “START”:
Battery voltage
Except above:
Approximately 0V
NG
E
OK
INSPECTION END
Check if 40A fusible link is OK.
OK
E
NG
Replace 40A fusible link.
CHECK INPUT SIGNAL CIRCUIT.
1. Turn ignition switch to “LOCK” position.
2. Disconnect ECM harness connector,
ignition switch connector.
3. Check harness continuity between ECM
connector terminal
422
and ignition
switch connector terminal
q
5
. Refer to
wiring diagram.
Continuity should exist.
If OK, check harness for short circuit.
OK
E
NG
Check the following:
I
Harness connectors
M787
,
F66
(LHD mod-
els)
I
Condition and operations
of ignition switch
I
Harness for open or
short-circuit between
ECM and ignition switch
If NG, repair ignition
switch, harness or con-
nectors.
Disconnect and reconnect harness connec-
tors in the circuit. Then retest.
Trouble is not fixed.
Check ECM pin terminals for damage and
check the connection of ECM harness con-
nector. Reconnect ECM harness connector
and retest.
INSPECTION END
IGN “ON”
OFF
IGN “START”
ON
PBIB0763E
MEC966D
H
H
H
H
H
H
START SIGNAL
TD27Ti
EC-473
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