P1670
Read the instructions below then
start the fault diagnostic procedure.
Symptom: CHECK ENGINE.
Cruise control not working.
Throttle control may go into mechanical limp-home mode. P1251, P1260 or P1263 could be generated as a secondary fault.
Starting problems, especially when engine is cold
Limp-home relay, open circuit or short to ground
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Note
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The relay/electrical circuit that activates the throttle's limp-home function is faulty.
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Fault symptoms
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Cruise control not working.
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Throttle control may go into mechanical limp-home mode. P1251, P1260 or P1263 could be generated as a secondary fault.
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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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Engine running. Main relay voltage exceeding 10V. Output not active.
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Fault criteria:
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Output voltage below 2V for more than 1 s.
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Dependents:
System reaction to a fault:
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Cruise control blocked.
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OK report:
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Enable criteria fulfilled and fault criteria not fulfilled within 60 s.
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Fault handling:
(See section
Fault handling III, other emission-related components and functions
for more information.)
Diagnostic help
Fault diagnosis concerns electrical fault in connecting leads or in the relay.
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.
