P1662

Read the instructions below then start the fault diagnostic procedure.

Symptom: Engine weak. CHECK ENGINE.

P1662

Fault symptoms

•	Engine weak.

•	CHECK ENGINE.

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. Criteria fulfilled for 10 periods that must occur during 60 s (normally, it takes 0.3 s for a trouble code to be generated but occasionally, it may take much longer).

Dependents:

-

None.

System reaction to a fault:

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

OK report:

-

As for P1549: Engine running for longer than 60 sec. Charge air control valve PWM has exceeded 10 % on one occasion. Engine speed above 2500 rpm. Charge air control governing air mass per combustion. Current air mass per combustion differs less than 50 mg/c from requested. Or. Engine running for longer than 60 sec. Charge air control valve PWM has exceeded 10 % on one occasion. Engine speed 2000-3500 rpm. Requested air mass per combustion exceeding 650 mg/c. Throttle control governing air mass per combustion. Charge air pressure below 160 kPa. Current air mass per combustion differs less than 50 mg/c from requested.

Fault handling: (For more information, see .)

-

Type III.

Diagnostic help

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

Functions in the diagnostic tool related to the fault:

•	Activate valve output.

For information, see .

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.