2002 NISSAN TERRANO Service Repair Manual

Diagnostic Procedure
INSPECTION START
CHECK INPUT SIGNAL CIRCUIT.
1. Turn ignition switch to ªLOCKº position.
2. Disconnect ECM harness connector
and combination meter harness con-
nector.
3. Check harness continuity between
ECM connector terminal
417and
combination meter connector terminal
q
26. Refer to wiring diagram.
Continuity should exist.
If OK, check harness for short-circuit.
OK
ENG
Check the following:
IHarness for open or
short-circuit between
ECM and combination
meter
If NG, repair harness or
connectors.
CHECK SPEEDOMETER FUNCTION.
Make sure that speedometer functions
properly.
OK
ENG
Check the following:
IHarness for open or
short-circuit between
combination meter and
vehicle speed sensor
If NG, repair harness or
connectors.
Check vehicle speed sen-
sor and its circuit.
Refer to EL section.
Disconnect and reconnect harness con-
nectors 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
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DTC P0500 VEHICLE SPEED SENTD27Ti
EC-399

Component Description
BRAKE SWITCH
The ECM receives signals from two brake switches. One is a con-
ventional brake lamp switch, the other is referred to as a redundant
brake switch 2.
In case the accelerator pedal does not return to the idle position
(pedal sticks), the driver will react by depressing the brake. In this
(emergency) situation, the ECM will disregard the accelerator pedal
signal and bring back the engine speed to 1,200 rpm.
On Board Diagnosis Logic
DTC Malfunction is detected when ...Check Items
(Possible Cause)
P0571
0807IBrake switch circuits are open or shorted.IHarness or connectors
(Brake switch circuits are open or shorted.)
IStop lamp switch
IBrake switch 2
DTC Confirmation Procedure
WITH CONSULT-II
1) Turn ignition switch to ªONº position and select ªDATA MONI-
TORº mode with CONSULT-II.
2) Depress brake pedal for at least 1 minute.
WITHOUT CONSULT-II
1) Turn ignition switch to ªONº position.
2) Depress brake pedal for at least 1 minute.
3) Turn ignition switch to ªLOCKº position, wait at least 5 seconds
and then turn to ªONº position.
4) Perform ªDiagnostic Test Mode IIº (Self-diagnostic results).
DTC P0571 BRAKE SWTD27Ti
EC-400

Wiring Diagram
YEC148A
DTC P0571 BRAKE SWTD27Ti
EC-401

Diagnostic Procedure
INSPECTION START
(Stop lamp switch circuit)
CHECK POWER SUPPLY.
1. Turn ignition switch to ªLOCKº position.
2. Disconnect stop lamp switch harness
connector.
3. Check voltage between stop lamp
switch harness connector terminalq
1and engine ground.
Voltage: Battery voltage
OK
ENG
Check the following:
I15A fuse
IHarness for open or
short-circuit between
fuse block and stop
lamp switch
If NG, repair harness or
connectors.
CHECK STOP LAMP SWITCH INPUT
SIGNAL CIRCUIT.
1. Disconnect ECM harness connector.
2. Check harness continuity between
ECM connector terminal
405and stop
lamp switch terminalq2. Refer to wiring
diagram.
Continuity should exist.
If OK, check harness for short-circuit.
OK
ENG
Repair harness or connec-
tors.
CHECK BRAKE SWITCH INPUT SIGNAL
CIRCUIT.
1. Disconnect brake switch harness con-
nector.
2. Check harness continuity between
brake switch terminalq
2and ECM ter-
minal416. Refer to wiring diagram.
Continuity should exist.
If OK, check harness for short-circuit.
OK
ENG
Repair harness or connec-
tors.
CHECK GROUND CIRCUIT.
1. Check harness continuity between
brake switch terminalq
1and ground.
Refer to wiring diagram.
Continuity should exist.
If OK, reconnect harness connectors.
OK
ENG
Repair harness or connec-
tors.
CHECK COMPONENT.
(Stop lamp switch and brake switch)
Refer to ªCOMPONENT INSPECTIONº,
EC-403.
OK
Disconnect and reconnect harness con-
nectors 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
MEC952D
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DTC P0571 BRAKE SWTD27Ti
EC-402

Component Inspection
STOP LAMP SWITCH AND BRAKE SWITCH 2
1. Turn ignition switch to ªLOCKº position.
2. Disconnect switch connectors.
3. Check continuity between terminalsq
1andq2.
Continuity:
Brake pedal Stop lamp switch Brake switch 2
Released No No
Depressed Yes Yes
If NG, replace stop lamp switch or brake switch.
MEC968D
DTC P0571 BRAKE SWTD27Ti
EC-403

Component Description
Malfunction Indicator (MI) is located on the instrument panel. When the ignition switch is turned ON without
engine running, MI will light up. This is a bulb check. When the engine is started, MI should go off. If MI remains
on, the on board diagnostic system has detected an engine system malfunction.
On Board Diagnosis Logic
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P0650
0907Malfunction indicator (MI) control cir-
cuitIAn excessively high voltage is sent
to ECM through the MI circuit
under the condition that calls for MI
light up.
IAn excessively low voltage is sent
to ECM through the MI circuit
under the condition that calls for MI
not to light up.IHarness or connectors
(MI circuit is open or shorted.)
IMI
DTC Confirmation Procedure
NOTE:
If ªDTC Confirmation Procedureº has been previously
conducted, always turn ignition switch ªOFFº and wait at least
10 seconds before conducting the next test.
WITH CONSULT-II
1. Turn ignition switch ªONº.
2. Select ªDATA MONITORº mode with CONSULT-II.
3. Start engine and let it idle for 2 second.
WITHOUT CONSULT-II
1. Turn ignition switch ªONº.
2. Perform ªDiagnostic Test Mode IIº (Self-diagnostic results).
3. Start engine and let it idle for 2 second.
4. Perform ªDiagnostic Test Mode IIº (Self-diagnostic results).
SEF817Y
DTC P0650 MITD27Ti
EC-404

Wiring Diagram
YEC249A
DTC P0650 MITD27Ti
EC-405

Diagnostic Procedure
INSPECTION START
CHECK MI POWER SUPPLY.
1. Turn ignition switch ªOFFº.
2. Disconnect combination meter harness
connector.
3. Turn ignition switch ªONº.
4. Check voltage between combination
meter terminalq
28and ground with
CONSULT-II or tester.
Voltage: Battery voltage
OK
ENG
Check the following.
IFuse block (J/B) con-
nector
F48(LHD mod-
els)M756(RHD models)
I10A fuse
IHarness for open or
short between fuse
block (J/B) and combi-
nation meter
If NG, repair harness or
connectors.
CHECK MI OUTPUT SIGNAL CIRCUIT
FOR OPEN AND SHORT.
1. Turn ignition switch ªOFFº.
2. Disconnect ECM harness connector.
3. Check harness continuity between ECM
terminals
215and combination meter
terminalq14. Refer to Wiring Diagram.
4. Also check harness for short to ground
and short to power.
Continuity should exist.
OK
ENG
Repair harness or connec-
tors.
CHECK COMBINATION METER.
1. Turn ignition switch ªOFFº.
2. Disconnect combination meter harness
connector.
3. Check continuity under the following
conditions.
OK
ENG
Replace combination
meter. Refer to EL section.
Disconnect and reconnect harness con-
nectors in the circuits. 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
CONDITIONTerminal No.
(Polarity)Continuity
1q
28(+) -q14(þ)Should not
exist.
2q
28(þ) -q14(+)Should
exist.
YEC239A
YEC240A
YEC241A
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DTC P0650 MITD27Ti
EC-406