Check for continuity between ECM/PCM connector terminal B16 and body ground. Is there continuity?
YES | - | Go to Step 15 .
NO | - | Repair open in the wire between the ECM/PCM (B16) and the EGR valve, then go to Step 26 .
Remove the EGR valve. Clean the intake manifold EGR port with carburetor cleaner. Also, clean the passage inside the EGR valve with carburetor cleaner. Install the EGR valve. Reconnect all connectors. Turn the ignition switch ON (ll). Reset the ECM/PCM with the HDS. Do the ECM/PCM idle learn procedure. Start the engine. Hold the engine speed at 3,000 rpm (min −1 ) without load (in Park or neutral) until the radiator fan comes on, then let it idle. Do the EGR TEST in the INSPECTION MENU with the HDS. Is the result OK?
YES | - | Go to Step 30 .
NO | - | Go to Step 24 .
Turn the ignition switch OFF. Replace the EGR valve. Turn the ignition switch ON (II). Reset the ECM/PCM with the HDS. Do the ECM/PCM idle learn procedure. Start the engine. Hold the engine speed at 3,000 rpm (min −1 ) without load (in Park or neutral) until the radiator fan comes on, then let it idle. Do the EGR TEST in the INSPECTION MENU with the HDS. Check for Temporary DTCs or DTCs in the DTCs MENU with the HDS. Are any Temporary DTCs or DTCs indicated?
YES | - | If DTC P0404 is indicated, check for poor connections or loose terminals at the EGR valve and the ECM/PCM, then go to Step 1 . If connections are OK, go to the Step 33 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.
NO | - | Go to Step 32 .
Monitor the OBD STATUS for DTC P0404 in the DTCs MENU with the HDS. Does the screen indicate PASSED?
YES | - | Troubleshooting is complete.■
NO | - | If the screen indicates FAILED, go to Step 1 and recheck. If the screen indicates EXECUTING, keep driving until a result comes on. If the screen indicates OUT OF CONDITION, go to Step 29 and recheck.
Update the ECM/PCM if it does not have the latest software, or substitute a know-good ECM/PCM. Do the EGR TEST in the INSPECTION MENU with the HDS. Check for Temporary DTCs or DTCs in the DTCs MENU with the HDS. Are any Temporary DTCs or DTCs indicated?
YES | - | If DTC P0404 is indicated, check for poor connections or loose terminals at the EGR valve and the ECM/PCM, then go to Step 1 . If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.
NO | - | If the ECM/PCM was updated, troubleshooting is complete. If ECM/PCM was substituted, replace the original ECM/PCM. ■