Fault Conditions

P1670
Throttle Limphome Relay Coil Circuit. Open / Short to Ground.

Fault symptoms
- CHECK ENGINE.
- Cruise control not working.
- Throttle control may go onto limp-home mode, whereby P1251, P1260 or P1263 can be generated as a secondary fault.

On-Board Diagnostics
Type of diagnosis:
- Continuous. But interrupted when fault criteria fulfilled and does not restart until next driving cycle.

Enable conditions:
- 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 "Fault diagnosis, general" for more information.
- Type III.

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 multi meter, diagnostic tool or test lamp during the check.

Proceed to Diagnostic Procedures Checking the Relay Power Supply