Page 219 of 363
JSA052.0
INJECTION
Fault finding - Status and parameter checks
17
D7F 710
engine -
55 tracks
Engine stopped, ignition on.NOTES
Order of
operationsFunction to be
checkedAction Bargraph Display and notes Fault finding
6Throttle
position
potentiometer
.No load
# 17
Accelerator
pedal
slightly
depressed
Full load
# 1710 < X < 50
185 < X < 245
DIAG 2
7Pressure sensor
# 01X = Atmospheric
pressureDIAG 9
8Coolant
temperature
sensor# 02X = Engine temperature
± 5 °CDIAG 3
9Air
temperature
sensor# 03X = Temperature under
bonnet ± 5 °CDIAG 4
10 Fan assemblyG17*The fan must operateDIAG 17
11 Fault warning
lightSwitch
ignition onThe fault warning light
must illuminate then
extinguishDIAG 19
2
2
2
17-176
Page 226 of 363
Check the insulation, continuity and that there is no interference resistance on the electrical line :
Computer 15 2 Coolant temperature sensor
Computer 44 1 Coolant temperature sensor
Repair.
JSA052.0
INJECTION
Fault finding - Status and parameter interpretation17
D7F 710
engine -
55 tracks
AFTER REPAIRStart the status and parameter check again from the beginning.
DIAG 3COOLANT TEMPERATURE
XR25 aid:# 02 = Engine temperature ± 5 °C
No fault bargraphs should be illuminated.
NOTES
If the value read is inconsistent, check the sensor correctly follows the standard table of values for
"resistance as a function of temperature".
Replace the sensor if the values are incorrect (
NOTE : If a sensor is incorrect, this is often due to an electric
shock).
17-183
Page 250 of 363
JSA052.0
INJECTION Fault finding - Aid
17
D7F 710
engine -
55 tracks
For further details, refer to section 12
Injector resistance = 14.5 Ω
Idle regulation stepping
motor resistance : A - D = 100 Ω
B - C = 100 Ω
Canister bleed valve resistance = 35 Ω
Ignition coil resistance : Primary = 1-4 ; 1-3 ; 2-3 ; 2-4 = 1.5 Ω
3-4 = 0.6 Ω
Secondary = 8 kΩ
Oxygen sensor heating resistance = 3 to 15 Ω
Throttle potentiometer resistance : no load A-B = 1300 Ωfull load A-B = 1300 Ω
A-C= 1360 ΩA-C= 2350 Ω
B-C = 2300 ΩB-C = 1260 Ω
Flywheel signal resistance = 220 Ω
Fuel pressure = 3 bars ignition on/ 2.5 bars at idle speed
Value for: CO = 0.3 % maximum
HC = 100 ppm maximum
CO2 = 14.5 % minimum
Oxygen = 0.97 < λ < 1.03
Sensor resistance
Temperature in °C 0 20 40 80 90
Air temperature sensor
Resistance in ohms5000
to
70001700
to
3300500
to
1550--
Coolant temperature sensor
Resistance in ohms6700
to
80002600
to
30001100
to
1300270
to
300200
to
215
17-207
Page 253 of 363
JSA051.0
INJECTION
Fault finding - Checking conformity
17
D7F 710
engine -
55 tracks
Engine cold, ignition on.NOTES
Order of
operationsFunction to be
checkedAction Bargraph Display and notes
6 Throttle position
potentiometerNo load
# 17
Accelerator
pedal slightly
depressed
Full load
# 17 10 < X < 50
185 < X < 245
7Absolute pressure
sensor# 01 X = Local atmospheric
pressure
8Coolant temperature
sensor# 02 X = Ambient temperature
± 5 °C
9Air temperature
sensor# 03 X = Ambient temperature
± 5 °C
10Idle speed regulation
stepping motor# 12The value read is variable
depending on the coolant
temperature : : 11 % ≤ X ≤
100 %
11Engine speed
# 06 X = 0 rpm
12Canister bleed
# 23 X = 0.7 %
2
2
2
17-210
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