P1253
Read the instructions below then
start the fault diagnostic procedure.
Symptom: CHECK ENGINE.
Incorrect idle speed.
Cruise control inoperative.
Engine does not start when DTC generated and throttle does not open for starting.
Starting problems, especially when engine is cold.
Throttle Motor. Full PWM in Open Direction During Cranking.
Fault symptoms
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Cruise control inoperative.
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Engine does not start when DTC generated and throttle does not open for starting.
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Starting problems, especially when engine is cold.
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On-Board Diagnostics
Type of diagnosis:
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Continuous. But interrupted when fault criteria fulfilled and will not restart until next driving cycle.
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Enable criteria:
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Crankshaft rotating but engine not yet started. Main relay voltage exceeding 5V.
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Fault criteria:
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Throttle motor is receiving 100 % PWM in opening direction.
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Dependents:
System reaction to a fault:
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Throttle control goes into limp-home mode. The limp-home solenoid will be activated 5 times in succession each time the ignition is turned on until the fault has been rectified and the trouble codes cleared.
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OK report:
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Accelerator pedal has been depressed at some time and then fully released. 120 s has expired since then without fault criteria being fulfilled.
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Fault handling:
(See “Fault diagnosis, general” for more information.)
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CHECK ENGINE goes on immediately and can be turned off only by clearing the trouble codes.
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Diagnostic help
A mechanical or electrical fault is preventing the throttle from opening during starter motor cranking. The main relay voltage supplied to the control module is OK.
Diagnostic tool functions related to this fault are:
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Activation of output for throttle motor.
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See also the description of activations under
Menu "Activation"
for more information.
Check the wiring
Jiggle the leads and in-line connectors at various points and in different directions to detect any intermittent breaks or short circuits in the wiring. Observe the multimeter, test lamp or diagnostic tool while doing this.
