P1512

VARIABLE INTAKE MANIFOLD, INNER FLAP





Fault Symptoms.
CHECK ENGINE lamp (MIL) on.
Impaired performance.

Conditions.
P1512
^ Engine speed higher than 80 rpm.
^ Battery voltage 7.5 to 17 V.
^ Shorting to battery positive (B+).

P1515
^ Engine speed higher than 80 rpm.
^ Battery voltage 7.5 to 17 V.
^ Shorting to battery negative (B-).

P1516
^ Engine speed higher than 80 rpm.
^ Battery voltage 7.5 to 17 V.
^ Open circuit.

Diagnostic Help.
The solenoid valve for the variable intake manifold's inner flap can be activated with the ISAT scan tool.
- Select "ACTIVATE".
- Select "VARIABLE INTAKE".
- Select "INNER FLAP".

The command activates the valve at a frequency of 0.5 Hz for 30 seconds.

Check The Wiring.
Intermittent faults may occur as a result of temporary short circuits and breaks in the wiring. Jiggle the wiring at several points and in different directions to ascertain whether the wiring harness, including any connectors, is causing the trouble. Observe the multimeter, ISAT scan tool or test lamp while doing this.





Diagnostic Procedure.
1. Check the solenoid valve's power supply
- Unplug the solenoid valve's 2-pin connector.
- Turn the ignition switch to the ON position.
- Connect a test lamp to pin 1 and battery negative (B-).

The test lamp should light up.
Test lamp on?

YES: Continue with point 2.
NO: Check and if necessary repair or replace the lead between crimped connection J128 and pin 1 of the 2-pin connector.
Then continue with point 3.





2. Check the control module output to the solenoid valve
- Connect the test lamp to battery positive (B+) and pin 2 of the solenoid valve's 2-pin connector
- Connect the ISAT Scan Tool.
- Turn the ignition switch to the ON position.
- Select "ACTIVATE".
- Select "VARIABLE INTAKE".
- Select "INNER FLAP".

The test lamp should flash at a frequency of 0.5 Hz for 30 seconds.

Test lamp flashing?
YES: Change the solenoid valve. Then continue with point 3.
NO: Repair or replace the relevant lead. Then continue with point 3.





3. Final check
- Clear the diagnostic trouble code.
- Implementation of driving cycle:
^ Drive the car at varying engine loads and rpm for 5 minutes.
- Evaluation of driving cycle:
^ Check whether the diagnostic trouble code has recurred.

Has the diagnostic trouble code recurred?

YES: Continue as described at "Before Replacing a Control Module". Component Tests and General Diagnostics
NO: The steps taken to rectify the fault were correct.