Engine Control Module: Testing and Inspection

Test 1 - 2:

Test 3 - 6:

Test 7 - 10:

Test 11 - 14:

Test 15 - 16:

SYMPTOM
CHECKING THE POWER AND GROUNDS

POSSIBLE CAUSES
- Checking the engine control relay system
- ECM ground circuit(s) open
- ECM output shorted - fuse 16
- ECM output shorted - fuse 17
- EGR valve/crankcase heater
- Engine control relay
- Engine control relay B+ supply
- Engine control relay output circuit(s) open
- Engine control relay output CKT shorted to ground fuse #16
- Engine control relay output CKT shorted to ground fuse #17
- Engine control relay signal circuit open
- Fuse block no.1
- Ignition switch start output circuit open
- Ignition switch start/run output circuit open