Exhaust Gas Recirculation: Testing and Inspection
OVERALL FUNCTION CHECKUse this procedure to check the overall EGR function. During this check, a DTC might not be confirmed.
Before starting with the following procedure, check the engine coolant temperature of the freeze frame data with CONSULT or Generic Scan Tool.
If the engine coolant temperature is higher than or equal to 60°C (140°F), perform only "Procedure for malfunction A".
If the engine coolant temperature is lower than 60°C (140°F), perform both "Procedure for malfunction A" and "Procedure for malfunction B". In this case, check DTCs in the ECM and perform inspections one by one based on "INSPECTION PRIORITY".
Procedure for malfunction A
(1) Start engine and warm it up sufficiently.
(2) Check for the EGR valve lifting when revving from 2,000 rpm up to 4,000 rpm under no load.
EGR valve should lift up and down without sticking.
(3) Disconnect EFI (EGR temperature sensor) sub-harness connector.
(4) Check voltage between EGR temperature sensor sub-harness connector terminal (2) and ground at idle speed.
Less than 4.5V should exist.
(5) Turn ignition switch "OFF".
Check harness continuity between EGR temperature sensor sub-harness connector terminal (6) and ECM terminal (50).
Continuity should exist.
(6) Perform "COMPONENT INSPECTION", "EGR temperature sensor".
Procedure for malfunction B
(1) Start engine.
(2) Turn EGRC-solenoid valve "ON" in "ACTIVE TEST" mode with CONSULT.
(3) Check for the EGR valve lifting when revving from 2,000 rpm up to 4,000 rpm under no load.
EGR valve should be closed and should not lift up.
OR
(1) Confirm the engine coolant temperature is lower than 55°C (131°F) in "Mode 1" with generic scan tool. Perform the following steps before its temperature becomes higher than 55°C (131°F).
(2) Start engine.
(3) Check for the EGR valve lifting when revving from 2,000 rpm up to 4,000 rpm under no load.
EGR valve should be closed and should not lift up.
OR
(1) Confirm the voltage between ECM terminals (51) and (43) is higher than 2.08V. Perform the following steps before the voltage becomes lower than 2.08V.
(2) Start engine.
(3) Check for the EGR valve lifting when revving from 2,000 rpm up to 4,000 rpm under no load.
EGR valve should be closed and should not lift up.