STEP 1. Check the battery.
STEP 2. Check harness connector B-27 at ECM for damage.
STEP 3. Measure the ignition switch-IG signal voltage at ECM harness side connector B-27.
(1) Disconnect the connector B-27 and measure at the harness side.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal No. 92 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 C-403 at ETACS-ECU for damage.
STEP 5. Check harness connector C-403 at ETACS-ECU for damage.
STEP 6. Check for harness damage between ETACS-ECU connector C-403 (terminal No. 10) and ECM connector B-27 (terminal No. 92).
STEP 7. Check harness connector A-37X at MFI relay for damage.
STEP 8. Check the MFI relay.
(1) Remove the MFI relay.
(2) Check for continuity between the MFI relay terminals No. 1 and No. 3.- There should be continuity.
(3) Use jumper wires to connect MFI relay terminal No. 3 to the positive battery terminal and terminal No. 1 to the negative battery terminal.
(4) Check for continuity between the MFI relay terminals No. 4 and No. 2 while connecting and disconnecting the jumper wire at the negative battery terminal.- Continuity (2 ohms or less) <Negative battery terminal connected>
- Should be open loop <Negative battery terminal disconnected>
(5) Install the MFI relay.
Is the measured resistance within the specified range?
Go to Step 9. Replace the MFI relay. Then go to Step 11.
STEP 9. Check for short circuit to ground between MFI relay connector A-37X (terminal No. 1) and ECM connector B-27 (terminal No. 73).
STEP 10. Using scan tool MB991958, read the diagnostic trouble code (DTC).
caution | To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958. |
(1) Connect scan tool MB991958 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) After the DTC has been deleted, read the DTC again.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Is DTC P0606 set?
Replace the ECM (Refer to, Removal and Installation ). Then go to Step 11. It can be assumed that this malfunction is intermittent. Refer to GROUP 00, How to Use Troubleshooting/ Inspection Service Points - How to Cope with Intermittent Malfunctions .
STEP 11. Using scan tool MB991958, read the diagnostic trouble code (DTC).
caution | To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958. |
(1) Connect scan tool MB991958 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) After the DTC has been deleted, read the DTC again.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Is DTC P0606 set?
Retry the troubleshooting. The inspection is complete.