Engine Controls - Tests W/Codes - 4.0L: Description

Following procedures are functional tests of EEC-IV system. See Figure. These 5 basic test steps must be carefully followed in sequence to avoid misdiagnosis or replacement of non-faulty components.

• Visual Check & Vehicle Preparation
• Equipment Hookup
• KOEO (Key On Engine Off) SELF-TEST
• Computed Timing Check
• KOER (Key On Engine Running) SELF-TEST