P0170,P0171, P0172
Symptom: The CHECK ENGINE lamp (MIL) is on. Impaired driveability, hunting idle.
Any other diagnostic trouble codes (such as low fuel, pressure sensor, closed loop, misfiring).
Adaptation faulty
Symptom of fault
The CHECK ENGINE lamp (MIL) is on. Impaired driveability, hunting idle.
Any other diagnostic trouble codes (such as low fuel, pressure sensor, closed loop, misfiring).
Conditions
Ignition switch in ON position.
P0170: All-embracing DTC
P0171: Adaptation >100%%
P0172: Adaptation <-100%%
Diagnostic help
If the adaptation fault occurred on account of low fuel level, this is indicated by DTC
P1416 also being generated.
Adaptation can be ascertained using an ISAT scan tool.
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Select
"READ FUNCTIONS".
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Select
"GLOBAL ADAPTION".
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Current adaptation ±100%% will be shown.
Checking the wiring. Intermittent faults may occur as a result of occasional short circuits
and breaks in the wiring. Jiggle the leads and in-line connectors at several places and in
different directions to reveal faults in the wiring harness. Observe the multimeter, ISAT scan
tool or test lamp while carrying out this check.
Diagnostic procedure
1. Check additional diagnostic trouble codes in the Trionic
system
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Obtain readouts of all diagnostic
trouble codes using the ISAT scan tool.
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Are any of the above diagnostic trouble codes present?
Continue fault diagnosis for the relevant diagnostic trouble
code.
Continue with point 2.
2. Check for air leakage
Check that no air leakage occurs at the following points:
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the hose between the pressure
sensor and intake manifold
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the hose between the fuel pressure regulator and intake manifold
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3. Check pressure sensor
operation
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Turn the ignition switch to the ON
position and then back to the OFF position.
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Connect an ISAT scan
tool.
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Select
"READ FUNCTIONS".
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Select
"INTAKE PRESSURE".
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The ISAT scan tool should show a reading of about 102 kPa (NOTE: the reading
is dependent on air pressure).
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First build up a pressure of 0.6 bar
and then create a vacuum of * 0.6 bar. Use a pressure gauge and a pressure/vacuum
pump.
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The ISAT scan tool should show readings of 160±5 kPa and
40±5 kPa respectively (the ISAT scan tool readings may be somewhat lower at high
altitudes). The measurement is intended to detect any shift in the operating range of the
pressure sensor.
Are the readings OK?
Continue with point 4.
Change the pressure sensor and continue with point 5.
4. Other checks
Check:
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that the EVAP canister purge valve
is closed in the zero-voltage state
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that no air leakage occurs in the exhaust system ahead of the front heated
oxygen sensor or at its mounting.
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Checks OK?
Continue with point 5.
Rectify the fault and proceed to point 5.
5. Final check:
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Clear the diagnostic trouble
code
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Implementation of driving
cycle:
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Start the engine and run it at idling
speed until the temperature of the coolant reaches 60°C (140°F)
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Drive the car at 2000-3000 rpm and a load of 60-120 kPa for about 1
minute.
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Since throttle position changes should be avoided, as level a road as possible
should be chosen
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Evaluation of the driving
cycle:
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Connect an ISAT scan
tool.
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Select
"READ FUNCTIONS".
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Select
"GLOBAL ADAPTION".
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Is the ISAT scan tool reading "0%%"?
Repeat the driving cycle.
The ISAT scan tool reading is >50%% or <-50%%. Proceed to
.
The ISAT scan tool reading is <50%% or >-50%%. The remedial measure
taken was correct.
