P1488

Tests 1 - 3:

Tests 4 - 8:

Tests 9 - 11:

SYMPTOM
P1488-AUXILIARY 5 VOLT OUTPUT TOO LOW

POSSIBLE CAUSES
- 5-volt supply circuit open
- 5-volt supply circuit shorted to ground
- MAP sensor wiring harness intermittent problem
- MAP sensor wiring harness
- Camshaft position sensor
- Manifold air pressure sensor
- Oil pressure sensor
- Water in fuel sensor
- Engine control module