STEP 1. Check harness connector B-21, B-22, B-23 and B-24 at ignition coil for damage.
STEP 2. Check the ignition coil.
STEP 3. Measure the power supply voltage at ignition coil harness side connectors B-21, B-22, B-23 and B-24.
(1) Disconnect the connectors B-21, B-22, B-23 and B-24 and measure at the harness side.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal No. 3 and ground.- Voltage should be battery positive voltage.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Is battery positive voltage (approximately 12 volts) present?
Go to Step 5. Go to Step 4.
STEP 4. Check harness connector A-37X at MFI relay for damage.
STEP 5. Check the circuit at ignition coil harness side connector B-21, B-22, B-23 and B-24.
(1) Disconnect the ignition coil connectors B-21, B-22, B-23 and B-24 and connect test harness special tool MB991658 between the separated connector (All terminals should be connected).
(2) Engine: 3,000 r/min
(3) Measure the voltage between terminal No. 1 and ground.- Voltage should be between 0.3 and 3.0 volts.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Is the measured voltage between 0.3 and 3.0 volts?
Go to Step 8. Go to Step 6.
STEP 6. Check harness connector B-26 at ECM for damage.
STEP 7. Check for open circuit and short circuit to ground between ignition coil connector and ECM connector.
STEP 8. Check the continuity at ignition coil harness side connector B-21, B-22, B-23 and B-24.
(1) Disconnect the connectors B-21, B-22, B-23 and B-24 and measure at the harness side.
(2) Check for the continuity between terminal No. 2 and ground.- Continuity (2 ohms or less).
Does continuity exist?
Go to Step 9. Repair harness wire between ignition coil connectors B-21, B-22, B-23 and B-24 (terminal No. 2) and ground because of open circuit or harness damage. Then confirm that the malfunction symptom is eliminated.
STEP 9. Check harness connector A-37X at MFI relay for damage.
STEP 10. Check for harness damage between MFI relay connector A-37X (terminal No. 2) and ignition coil connector B-21, B-22, B-23 and B-24 (terminal No. 3)
STEP 11. Check harness connector B-26 at ECM for damage.
STEP 12. Check for harness damage between ignition coil connector and ECM connector.