Nissan Leaf. Instruction — part 1144
DIAGNOSIS AND REPAIR WORK FLOW
STC-21
< BASIC INSPECTION >
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STC
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YES
>> GO TO 7.
NO
>> Check harness and connectors based on the information obtained by interview. Refer to
.
7.
FINAL CHECK
With CONSULT
1. Check the reference value for “EPS” control unit.
2. Recheck the symptom and check that symptom is not reproduced on the same conditions.
Is the symptom reproduced?
YES
>> GO TO 3.
NO
>> Inspection End.
Diagnostic Work Sheet
INFOID:0000000010119194
Description
• In general, customers have their own criteria for a problem. Therefore, it is important to understand the
symptom and status well enough by asking the customer about his/her concerns carefully. To systemize all
the information for the diagnosis, prepare the interview sheet referring to the interview points.
• In some cases, multiple conditions that appear simultaneously may cause a DTC to be detected.
Interview sheet sample
Interview sheet
Customer
name
MR/MS
Registration
number
Initial year
registration
Vehicle type
VIN
Storage date
Mileage
km (Mile)
Symptom
The steering wheel position (center) is in the wrong position.
EPS warning lamp turns on.
Noise
Vibration
Others
(
)
First occurrence
Recently
Others (
)
Frequency of occurrence
Always
Under a certain conditions of
Sometimes (time(s)/day)
Climate con-
ditions
Irrelevant
Weather
Fine
Cloud
Rain
Snow
Others (
)
Temperature
Hot
Warm
Cool
Cold
Temperature [Approx.
°C °F)]
Relative humidity
High
Moderate
Low
Road conditions
Urban area
Suburb area
High way
Mountain road (uphill or down hill)
Rough road
Operation conditions, etc.
Irrelevant
During driving
During acceleration
At constant speed driving
During deceleration
During cornering (right curve or left curve)
During steering
STC-22
< BASIC INSPECTION >
DIAGNOSIS AND REPAIR WORK FLOW
Other conditions
Memo
Interview sheet
Customer
name
MR/MS
Registration
number
Initial year
registration
Vehicle type
VIN
Storage date
Mileage
km (Mile)
C1601 BATTERY POWER SUPPLY
STC-23
< DTC/CIRCUIT DIAGNOSIS >
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DTC/CIRCUIT DIAGNOSIS
C1601 BATTERY POWER SUPPLY
DTC Logic
INFOID:0000000010119195
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
PRECONDITIONING
If “DTC CONFIRMATION PROCEDURE” has been previously conducted, always turn power switch OFF and
wait at least 10 seconds before conducting the next test.
>> GO TO 2.
2.
DTC REPRODUCTION PROCEDURE
With CONSULT
1. Turn the power switch OFF to ON.
2. Perform “Self-Diagnosis Result” of “EPS” control unit.
Is DTC “C1601” detected?
YES
>> Proceed to diagnosis procedure. Refer to
NO
>> Inspection End.
Diagnosis Procedure
INFOID:0000000010119196
Regarding Wiring Diagram information, refer to
.
1.
CHECK EPS CONTROL UNIT GROUND CIRCUIT
1. Turn power switch OFF.
2. Disconnect EPS control unit harness connector.
3. Check continuity between EPS control unit harness connector terminal and ground.
4. Connect EPS control unit harness connector.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Repair open circuit or short to ground or short to power in harness or connectors.
2.
CHECK EPS CONTROL UNIT POWER SUPPLY CIRCUIT (1)
1. Check voltage between EPS control unit harness connector terminals and ground.
DTC
Display item
Malfunction detected condition
Possible cause
C1601
BATTERY VOLT
When a power supply voltage to the EPS control unit
is maintained at 18.2 V or more or at less than 9 V
continuously for five second or more.
• Harness or connector
• EPS control unit
• Fuse
• Power supply system
• 12V Battery
EPS control unit
—
Continuity
Connector
Terminal
M38
10
Ground
Yes
STC-24
< DTC/CIRCUIT DIAGNOSIS >
C1601 BATTERY POWER SUPPLY
2. Turn power switch ON.
CAUTION:
Never set the vehicle to READY.
3. Check voltage between EPS control unit harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> GO TO 3.
3.
CHECK EPS CONTROL UNIT POWER SUPPLY CIRCUIT (2)
1. Turn power switch OFF.
2. Check the 10A fuse (#3).
3. Check the harness for open or short between EPS control unit harness connector M37 terminal 4 and the
10A fuse (#3).
Is the inspection result normal?
YES
>> Perform the trouble diagnosis for power switch ON power supply. Refer to
gram — Battery Power Supply —"
.
NO
>> Repair or replace malfunctioning parts.
4.
CHECK EPS CONTROL UNIT POWER SUPPLY CIRCUIT (3)
1. Turn power switch OFF.
2. Check voltage between EPS control unit harness connector terminals and ground.
3. Turn power switch ON.
CAUTION:
Never set the vehicle to READY.
4. Check voltage between EPS control unit harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 6.
NO
>> GO TO 5.
5.
CHECK EPS CONTROL UNIT POWER SUPPLY CIRCUIT (4)
1. Turn power switch OFF.
2. Check the 60A fusible link (N).
3. Check the harness for open or short between EPS control unit harness connector M38 terminal 9 and the
60A fusible link (N).
Is the inspection result normal?
YES
>> Perform the trouble diagnosis for 12V battery power supply. Refer to
EPS control unit
—
Voltage
(Approx.)
Connector
Terminal
M37
4
Ground
0 V
EPS control unit
—
Voltage
(Approx.)
Connector
Terminal
M37
4
Ground
Battery voltage
EPS control unit
—
Voltage
(Approx.)
Connector
Terminal
M38
9
Ground
Battery voltage
EPS control unit
—
Voltage
(Approx.)
Connector
Terminal
M38
9
Ground
Battery voltage
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