Circuit/System Verification

Ignition ON, perform the Auxiliary Gauge Sweep test with the scan tool, verify all auxiliary gauges sweep from the low to high positions.
- If none of the auxiliary gauges sweep properly
  Refer to Auxiliary Gauges Malfunction .
- If one, two, or three of the auxiliary gauges sweep properly
  Replace the P26 Auxiliary Gauge Module.
- If all auxiliary gauges sweep properly
Verify the Boost Gauge display matches the scan tool Boost Pressure parameter.
- If the Boost Gauge does not match the scan tool parameter
  Replace the P26 Auxiliary Gauge Module.
- If the Boost Gauge matches the scan tool parameter
Verify the scan tool boost pressure parameter is between -100 and +100 kPa (30 in Hg and 15 psi) and changes with engine load changes.
- If the scan tool parameter is not between -100 and +100 kPa (30 in Hg and 15 psi) or does not change with engine load changes
  Refer to DTC P0107 or P0108 .
- If the scan tool parameter is between -100 and +100 kPa (30 in Hg and 15 psi) and changes with engine load changes
All OK.