P1603
Read the instructions below then
start the fault diagnostic procedure.
Symptom: CHECK ENGINE goes on immediately.
Throttle control in limp-home mode.
Idling speed incorrect.
Cruise control not working.
Internal Control Module. Malfunction.
Fault symptoms
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CHECK ENGINE goes on immediately.
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Throttle control in limp-home mode.
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Idling speed incorrect.
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Cruise control not working.
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Conditions
The following conditions apply for this DTC:
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Ignition in ON position.
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Defective ROM in processor 592.
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Diagnostic help
Fault diagnosis concerns internal control module fault.
Checking the wiring
Jiggle the wiring harness at several points and in different directions to detect intermittent breaks and short circuits. Observe the multimeter, diagnostic tool or test lamp during the check.
