Nissan Terrano r20e. Manual — part 121
Description
The ECM consists of a microcomputer and connectors for signal
input and output and for power supply. The unit controls the engine.
On Board Diagnosis Logic
Malfunction is detected when ...
Check Items (Possible Cause)
I
ECM calculation function is malfunctioning.
I
ECM
DTC Confirmation Procedure
WITH CONSULT-II
1) Turn ignition switch “ON”.
2) Select “DATA MONITOR” mode with CONSULT-II.
3) Start engine and wait at least 2 seconds.
4) If DTC is detected, go to “Diagnostic Procedure”, EC-122.
WITHOUT CONSULT-II
1) Turn ignition switch “ON” and wait at least 2 seconds.
2) Start engine and wait at least 2 seconds.
3) Turn ignition switch “OFF”, wait at least 5 seconds and then turn
“ON”.
4) Perform “Diagnostic Test Mode II (Self-diagnostic results)” with
ECM.
5) If DTC is detected, go to “Diagnostic Procedure”, EC-122.
SEC220B
SEF817Y
DTC 0301 ECM 2, DTC 0901 ECM 12
ZD30DDTi
EC-121
Diagnostic Procedure
1
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-121, again.
5. Is the malfunction 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-121, again.
4. Perform “Diagnostic Test Mode II (Self-diagnostic results)”.
5. Is the DTC 0301 or 0901 displayed again?
Yes or No
Yes
E
Replace ECM.
No
E
INSPECTION END
DTC 0301 ECM 2, DTC 0901 ECM 12
ZD30DDTi
EC-122
Description
SYSTEM DESCRIPTION
The ECM and the electronic control fuel injection pump control unit
(abbreviated as the injection pump control unit) perform the real
time communication (signal exchange).
The ECM transmits the signals of the target fuel injection amount,
target fuel injection timing, and engine speed, etc., and receives the
signals of the pump speed and fuel temperature, etc. from the
injection pump control unit.
By those signals, the injection pump controls the optimum fuel
injection amount and injection timing of the spill valve and timing
control valve.
Injection pump control unit has an on board diagnostic system,
which detects malfunctions related to sensors or actuators built-into
electronic control fuel injection pump. These malfunction informa-
tion are transferred through the line (circuit) from injection pump
control unit to ECM.
FUEL INJECTION AMOUNT CONTROL
In accordance with the target fuel injection amount signal from the
ECM, the injection amount is controlled by controlling the spill valve
in the injection pump and by changing the needle opening time.
FUEL INJECTION TIMING CONTROL
Based on the target fuel injection timing signal from the ECM, the
injection timing is controlled in accordance with the timer spring by
performing the duty control of the timing control valve in the injec-
tion pump and by adjusting the pressure of the timer piston high
pressure chamber.
FUEL TEMPERATURE SENSOR
The sensor detects the fuel temperature in the injection pump and
calibrates the injection amount change by the fuel temperature.
CAM RING POSITION SENSOR
The sensor detects the passing of the protrusion on the sensor
wheel in the injection pump by the semiconductor magnetic resis-
tance element sensor. The cam ring position sensor synchronizes
with the cam ring, and detects the actual advance amount. The
injection pump control unit measures the injection pump revolution
by the signal of the cam ring position sensor.
SEF437Y
DTC 0402 P9
⋅
FUEL TEMP SEN
ZD30DDTi
EC-123
CONSULT-II Reference Value in Data Monitor
Mode
Remarks: Specification data are reference values.
MONITOR ITEM
CONDITION
SPECIFICATION
FUEL TEMP SEN
I
Engine: After warming up
More than 40°C (104°F)
SPILL/V
I
Engine: After warming up
Approx. 13°CA
INJ TIMG C/V
I
Engine: After warming up,
idle the engine.
Approx. 50 - 70%
DECELER F/CUT
I
Engine: After warm-
ing up
Idle
OFF
BARO SEN
I
Ignition switch: ON
Altitude
Approx. 0 m (0 ft): Approx. 100.62 kPa (1.0062 bar, 1.026 kg/cm
2
, 14.59
psi)
Approx. 1,000 m (3,281 ft): Approx. 88.95 kPa (0.8895 bar, 0.907 kg/cm
2
,
12.90 psi)
Approx. 1,500 m (4,992 ft): Approx. 83.16 kPa (0.8316 bar, 0.848 kg/cm
2
,
12.06 psi)
Approx. 2,000 m (6,562 ft): Approx. 78.36 kPa (0.7836 bar, 0.799 kg/cm
2
,
11.36 psi)
ECM Terminals and Reference Value
Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do not use ECM ground terminals when measuring input/output voltage. Doing so may damage the
ECM’s transistor. Use a ground other than ECM terminals, such as the ground.
TER-
MINAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
33
G
Electronic control fuel
injection pump
Engine is running.
Warm-up condition
Idle speed
Approximately 2.5V
40
R
Electronic control fuel
injection pump
Engine is running.
Warm-up condition
Idle speed
Approximately 2.5V
52
Y
Electronic control fuel
injection pump
Engine is running.
Idle speed
Approximately 0.1V
53
OR
Electronic control fuel
injection pump
Engine is running.
Idle speed
Approximately 0.35V
On Board Diagnosis Logic
Malfunction is detected when .
Check Items (Possible cause)
I
An improper voltage signal from fuel temperature sensor
(Built-into electronic control fuel injection pump) is sent to
injection pump control unit.
I
Harness or connectors
(Electronic control fuel injection pump circuit is open or
shorted.)
I
Electronic control fuel injection pump
DTC 0402 P9
⋅
FUEL TEMP SEN
ZD30DDTi
EC-124
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