Nissan Murano. Instruction — part 857
HAC-202
< DTC/CIRCUIT DIAGNOSIS >
[WITH 7 INCH DISPLAY]
POWER SUPPLY AND GROUND CIRCUIT
POWER SUPPLY AND GROUND CIRCUIT
A/C AUTO AMP.
A/C AUTO AMP. : Description
INFOID:0000000009722200
COMPONENT DESCRIPTION
A/C Auto Amp. (Air Conditioner Automatic Amplifier)
The A/C auto amp. (1) has a built-in microcomputer that processes
information sent from various sensors needed for air conditioner
operation. The air mix door motor(s), the mode door motor, the
intake door motor, the upper ventilator door motor, the blower motor
and the compressor are then controlled.
When the various switches and temperature control dial are oper-
ated, data is input to the A/C auto amp. from the AV control unit
using CAN communication.
The A/C auto amp. is operated with control mechanisms. Signals
from various switches and Potentio Temperature Control (PTC) are
directly entered into the A/C auto amp.
Power Supply and Ground Circuit for A/C Auto Amp.
A/C AUTO AMP. : Component Function Check
INFOID:0000000009722201
1.
CHECK OPERATION
1.
Press the AUTO switch, and then check that “AUTO” is shown on the display.
2.
Operate the temperature control dial (driver side). Check that the fan speed or outlet changes. (The dis-
charge air temperature or fan speed varies depending on the ambient temperature, in-vehicle tempera-
ture, and temperature setting.)
Does it operate normally?
YES
>> INSPECTION END
NO
>> Perform trouble diagnosis for the A/C system. Refer to
HAC-202, "A/C AUTO AMP. : Diagnosis
.
A/C AUTO AMP. : Diagnosis Procedure
INFOID:0000000009722202
1.
INSPECTION BY FAIL-SAFE FUNCTION
1.
Turn the ignition switch ON.
2.
After approximately 30 seconds, check that the air conditioner is operated by the fail-safe function (the
operation display of air conditioner is not performed). Refer to
.
Is the fail-safe function operated?
YES
>> GO TO 5.
NO
>> GO TO 2.
2.
CHECK A/C AUTO AMP. POWER SUPPLY CIRCUIT
1.
Disconnect the A/C auto amp. connector.
2.
Check voltage between A/C auto amp. harness connector and ground.
JPIIA0609ZZ
JPIIA0617GB
POWER SUPPLY AND GROUND CIRCUIT
HAC-203
< DTC/CIRCUIT DIAGNOSIS >
[WITH 7 INCH DISPLAY]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> GO TO 3.
3.
CHECK FUSE
Check 10A fuses [Nos. 3, 6 and 19, located in the fuse block (J/B)].
NOTE:
Refer to
PG-91, "Fuse, Connector and Terminal Arrangement"
.
Is the inspection result normal?
YES
>> Repair the harnesses or connectors.
NO
>> Replace the fuse after repairing the applicable circuit.
4.
CHECK A/C AUTO AMP. CIRCUIT CONTINUITY
1.
Turn ignition switch OFF.
2.
Check continuity between A/C auto amp. harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> Repair the harnesses or connectors.
5.
CHECK PRESET SWITCH
Check the preset switch. Refer to
AV-155, "Removal and Installation"
(base audio without navigation),
(bose audio without navigation) or
AV-458, "Removal and Installation"
with navigation).
Is the inspection result normal?
YES
>> Replace the A/C auto amp.
NO
>> Repair or replace parts according to the inspection results.
(+)
(
−
)
Voltage
A/C auto amp.
—
Ignition switch position
Connector
Terminal
OFF
ACC
ON
M50
17
Ground
Approx. 0 V
Battery voltage
Battery voltage
20
Approx. 0 V
Approx. 0 V
Battery voltage
40
Battery voltage
Battery voltage
Battery voltage
A/C auto amp.
—
Continuity
Connector
Terminal
M50
19
Ground
Existed
39
HAC-204
< ECU DIAGNOSIS INFORMATION >
[WITH 7 INCH DISPLAY]
ECM
ECU DIAGNOSIS INFORMATION
ECM
Reference Value
INFOID:0000000009722203
VALUES ON THE DIAGNOSIS TOOL
NOTE:
• The following table includes information (items) inapplicable to this vehicle. For information (items) applica-
ble to this vehicle, refer to CONSULT display items.
• Numerical values in the following table are reference values.
• These values are input/output values that ECM receives/transmits and may differ from actual operations.
Example:
The ignition timing shown by the timing light may differ from the ignition timing displayed on the data monitor.
This occurs because the timing light shows a value calculated by ECM according to signals received from
the cam shaft position sensor and other sensors related to ignition timing.
For outlines of following items, refer to
.
Monitor Item
Condition
Values/Status
ENG SPEED
Run engine and compare CONSULT value with the tachometer indication.
Almost the same speed as
the tachometer indication.
MAS A/F SE-B1
.
B/FUEL SCHDL
.
A/F ALPHA-B1
.
A/F ALPHA-B2
.
COOLANT TEMP/S
• Engine: After warming up
More than 70
°
C (158
°
F)
A/F SEN1 (B1)
• Engine: After warming up
Maintaining engine speed at 2,000 rpm
Fluctuates around 2.2 V
A/F SEN1 (B2)
• Engine: After warming up
Maintaining engine speed at 2,000 rpm
Fluctuates around 2.2 V
HO2S2 (B1)
• Revving engine from idle to 3,000 rpm quickly after the following conditions
are met.
- Engine: After warming up
- After keeping engine speed between 3,500 and 4,000 rpm for 1 minute and at
idle for 1 minute under no load
0 - 0.3 V
←→
Approx. 0.6 -
1.0 V
HO2S2 (B2)
• Revving engine from idle to 3,000 rpm quickly after the following conditions
are met.
- Engine: After warming up
- After keeping engine speed between 3,500 and 4,000 rpm for 1 minute and at
idle for 1 minute under no load
0 - 0.3 V
←→
Approx. 0.6 -
1.0 V
HO2S2 MNTR (B1)
• Revving engine from idle to 3,000 rpm quickly after the following conditions
are met.
- Engine: After warming up
- After keeping engine speed between 3,500 and 4,000 rpm for 1 minute and at
idle for 1 minute under no load
LEAN
←→
RICH
HO2S2 MNTR (B2)
• Revving engine from idle to 3,000 rpm quickly after the following conditions
are met.
- Engine: After warming up
- After keeping engine speed between 3,500 and 4,000 rpm for 1 minute and at
idle for 1 minute under no load
LEAN
←→
RICH
VHCL SPEED SE
• Turn drive wheels and compare CONSULT value with the speedometer indi-
cation.
Almost the same speed as
speedometer indication
BATTERY VOLT
• Ignition switch: ON (Engine stopped)
11 - 14 V
ACCEL SEN 1
• Ignition switch: ON
(Engine stopped)
Accelerator pedal: Fully released
0.5 - 1.0 V
Accelerator pedal: Fully depressed
4.2 - 4.8 V
ACCEL SEN 2*
1
• Ignition switch: ON
(Engine stopped)
Accelerator pedal: Fully released
0.5 - 1.0 V
Accelerator pedal: Fully depressed
4.2 - 4.8 V
ECM
HAC-205
< ECU DIAGNOSIS INFORMATION >
[WITH 7 INCH DISPLAY]
C
D
E
F
G
H
J
K
L
M
A
B
HAC
N
O
P
TP SEN 1-B1
• Ignition switch: ON
(Engine stopped)
• Selector lever: D position
Accelerator pedal: Fully released
More than 0.36 V
Accelerator pedal: Fully depressed
Less than 4.75 V
TP SEN 2-B1*
1
• Ignition switch: ON
(Engine stopped)
• Selector lever: D position
Accelerator pedal: Fully released
More than 0.36 V
Accelerator pedal: Fully depressed
Less than 4.75 V
FUEL T/TMP SE
• Ignition switch: ON
Indicates fuel tank tempera-
ture
INT/A TEMP SE
• Ignition switch: ON
Indicates intake air tempera-
ture
EVAP SYS PRES
• Ignition switch: ON
Approx. 1.8 - 4.8 V
FUEL LEVEL SE
• Ignition switch: ON
Depending on fuel level of
fuel tank
START SIGNAL
• Ignition switch: ON
→
START
→
ON
OFF
→
ON
→
OFF
CLSD THL POS
• Ignition switch: ON
(Engine stopped)
Accelerator pedal: Fully released
ON
Accelerator pedal: Slightly depressed
OFF
AIR COND SIG
• Engine: After warming up, idle the
engine
Air conditioner switch: OFF
OFF
Air conditioner switch: ON
(Compressor operates.)
ON
P/N POSI SW
• Ignition switch: ON
Selector lever: P or N position
ON
Selector lever: Except above position
OFF
PW/ST SIGNAL
• Engine: After warming up, idle the
engine
Steering wheel: Not being turned
OFF
Steering wheel: Being turned
ON
LOAD SIGNAL
• Ignition switch: ON
Rear window defogger switch: ON
and/or
Lighting switch: 2nd position
ON
Rear window defogger switch and lighting
switch: OFF
OFF
IGNITION SW
• Ignition switch: ON
→
OFF
→
ON
ON
→
OFF
→
ON
HEATER FAN SW
• Engine: After warming up, idle the
engine
Heater fan switch: ON
ON
Heater fan switch: OFF
OFF
BRAKE SW
• Ignition switch: ON
Brake pedal: Fully released
OFF
Brake pedal: Slightly depressed
ON
INJ PULSE-B1
• Engine: After warming up
• Selector lever: P or N position
• Air conditioner switch: OFF
• No load
Idle
2.0 - 3.0 msec
2,000 rpm
1.9 - 2.9 msec
INJ PULSE-B2
• Engine: After warming up
• Selector lever: P or N position
• Air conditioner switch: OFF
• No load
Idle
2.0 - 3.0 msec
2,000 rpm
1.9 - 2.9 msec
IGN TIMING
• Engine: After warming up
• Selector lever: P or N position
• Air conditioner switch: OFF
• No load
Idle
7 - 17
°
BTDC
2,000 rpm
25 - 45
°
BTDC
CAL/LD VALUE
• Engine: After warming up
• Selector lever: P or N position
• Air conditioner switch: OFF
• No load
Idle
5 - 35%
2,500 rpm
5 - 35%
MASS AIRFLOW
• Engine: After warming up
• Selector lever: P or N position
• Air conditioner switch: OFF
• No load
Idle
2.0 - 6.0 g/s
2,500 rpm
7.0 - 20.0 g/s
Monitor Item
Condition
Values/Status
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