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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

P1670


Limp-home relay, open circuit or short to ground


Note

The relay/electrical circuit that activates the throttle's limp-home function is faulty.


Fault symptoms


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


On-Board Diagnostics

Type of diagnosis:


- Continuous. But interrupted when fault criteria fulfilled and will not restart until next driving cycle.


Enable criteria:


- Engine running. Main relay voltage exceeding 10V. Output not active.


Fault criteria:


- Output voltage below 2V for more than 1 s.


Dependents:


- None.


System reaction to a fault:


- Cruise control blocked.


OK report:


- Enable criteria fulfilled and fault criteria not fulfilled within 60 s.


Fault handling: (See section Fault handling III, other emission-related components and functions for more information.)


- Type III.


Diagnostic help

Fault diagnosis concerns electrical fault in connecting leads or in the relay.

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.