Engine Controls - Tests W/Codes: Summary

If no service code or Code 111 (pass code) is present, but driveability problem still exists, proceed to EEC-IV DIAGNOSIS BY SYMPTOM table. If driveability problem still cannot be located, go to TESTS W/O CODES article for diagnosis by symptoms (i.e., ROUGH IDLE, NO START, etc.) or intermittent diagnostic procedures.

EEC-IV DIAGNOSIS BY SYMPTOM

Symptom

Application

Circuit Test

A/C Does Not Cut Off During WOT

All

KM - Step 8)

A/C Not Functioning

All

KM - Step 1)

CHECK ENGINE Light Always On

⁽¹⁾ All

ML - Step 1)

CHECK ENGINE Light Flashing With Erratic Idle

⁽¹⁾ All

ML - Step 8)

CHECK ENGINE Light Never On

⁽¹⁾ All

ML - Step 2)

CHECK ENGINE Light On Intermittently

⁽¹⁾ All

ML - Step 7)

Engine Hesitates After Hot Restart

⁽¹⁾ All

H - Step 13)

Engine Hesitation

⁽¹⁾ All

S - Step 1)

Engine Lacks Power Or Loses Power

⁽¹⁾ All

S - Step 1)

Engine Miss At Idle, Acceleration Or Cruise

⁽¹⁾ All

S - Step 1)

Engine Runs Rough At All Times

⁽¹⁾ All

S - Step 2)

Engine Stalls

All

S - Step 2)

Engine Surge At Acceleration Or Cruise

⁽¹⁾ All

S - Step 1)

Erratic RPM

⁽¹⁾ All

S - Step 2)

Gasoline Fumes

With CANP

KD - Step 1)

⁽¹⁾	Ensure air induction and electrical connections are clean and tight.