P1663

Read the instructions below then start the fault diagnostic procedure.

Symptom: Engine lacks power. CHECK ENGINE.

P1663

Fault symptoms

•	Engine lacks power.

•	CHECK ENGINE.

On-Board Diagnostics

Type of diagnosis:

-	Continuous. However, it is interrupted once the fault criteria have been fulfilled and does not restart until the next driving cycle.

Enable criteria: (Conditions that must be fulfilled for diagnostics to be performed.)

-	Engine running. Main relay voltage exceeding 10V. Output is active.

Fault criteria: (When enable criteria have been fulfilled, diagnostics will check if the fault criteria have been fulfilled.)

-	Output voltage exceeding 2V. Conditions fulfilled during 10 periods that must occur within 60s. (It normally takes 0.3s for the diagnostic trouble code to be generated but it can sometimes take much longer.)

Dependents: (Once fault criteria have been fulfilled, a number of other diagnostics must report OK before the diagnostic trouble code can finally be generated.)

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None.

System reaction to a fault: (Once the fault criteria have been fulfilled, certain measures will sometimes be taken.)

-	Air mass per combustion is limited to 600 mg/c.

OK report: (This diagnosis may be included as a dependent to another diagnosis and must therefore report OK even if it is continuous. The OK report is also used in fault handling to count down the fault counter.)

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As for P1549: Engine running for more than 60s. Charge air control valve PWM has exceeded 10% on one occasion. Engine speed above 2500 rpm. Charge air control governing air mass per combustion. Actual air mass per combustion deviates less than 50 mg/c from the requested. Or Engine running for more than 60s. Charge air control valve PWM has exceeded 10% on one occasion. Engine speed 1000-2000 rpm. Requested air mass per combustion exceeding 650 mg/c. Throttle control governing air mass per combustion. Charge air pressure below 160 kPa. Actual air mass per combustion deviates less than 50 mg/c from the requested.

Fault handling: (Refer to section “Fault diagnosis, general” for more information.)

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Type III.

Diagnostic help

Fault diagnosis concerns an electrical fault in the connecting leads or in the valve.

Diagnostic tool functions related to this fault:

•	Activation of the output for the valve.

Refer also to the description of activations under ”Fault diagnosis, general” for more information.

Check the wiring

Jiggle the wiring harness at several points and in different directions to check if there are intermittent breaks and short-circuits in the leads. Observe the multimeter, test lamp or diagnostic instrument during the test.

See .