Exhaust Gas Recirculation: Testing and Inspection

OVERALL FUNCTION CHECK
Use 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 55°C (131°F), perform only "Procedure for malfunction A".
If the engine coolant temperature is lower than 55°C (131°F), perform both "Procedure for malfunction A" and "Procedure for malfunction B".
If the freeze frame data for another malfunction is stored in the ECM, 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
With CONSULT
1) Start engine and warm it up sufficiently.
2) Select "EGRC SOLENOID VALVE" in "ACTIVE TEST" mode with CONSULT and turn the solenoid valve "OFF".
3) Check the EGR valve lifting when revving engine from 2,000 rpm up to 4,000 rpm under no load. EGR valve should lift up and down without sticking.
4) Check voltage between EGR temperature sensor harness connector terminal (1) and ground at idle speed.
Less than 4.5V should exist.
5) Turn ignition switch "OFF".
6) Check harness continuity between EGR temperature sensor harness connector terminal (2) and ECM terminal (43).
Continuity should exist.
7) Perform "COMPONENT CHECK", "EGR temperature sensor".

Without Scan Tool
1) Disconnect EGR valve & EVAP canister purge control solenoid valve harness connector. (The DTC for EGR valve & EVAP canister purge control solenoid valve will be displayed, however, ignore it.)
2) Start engine and warm it up sufficiently.
3) Check the EGR valve lifting when revving engine from 2,000 rpm up to 4,000 rpm under no load. EGR valve should lift up and down without sticking.
4) Reconnect EGR valve & EVAP canister purge control solenoid valve harness connector.
5) Check voltage between EGR temperature sensor harness connector terminal (1) and ground at idle speed
Less than 4.5V should exist.
6) Turn ignition switch "OFF".
7) Check harness continuity between EGR temperature sensor harness connector terminal (2) and ECM terminal (43).
Continuity should exist.
8) Perform "COMPONENT CHECK", "EGR temperature sensor".
















Procedure for malfunction B
With CONSULT
1) Start engine.
2) Select "EGRC SOLENOID VALVE" in "ACTIVE TEST" mode with CONSULT and turn the solenoid valve "ON".
3) Check for the EGR valve lifting when revving engine from 2,000 rpm up to 4,000 rpm under no load.
EGR valve should be closed and should not lift up.

With Generic Scan Tool
1) Turn ignition switch "ON".
2) Confirm the engine coolant temperature is lower than 52°C (126°F) in "Mode 1" with GST. Perform the following steps before its temperature becomes higher than 52°C (126°F).
3) Start engine.
4) Check for the EGR valve lifting when revving engine from 2,000 rpm up to 4,000 rpm under no load.
EGR valve should be closed and should not lift up.

Without Scan Tool
1) Turn ignition switch "ON".
2) Confirm the voltage between ECM terminals (59) and (25) is higher than 2.24V.
Perform the following steps before the voltage becomes lower than 2.24V.
3) Start engine.
4) Check for the EGR valve lifting when revving engine from 2,000 rpm up to 4,000 rpm under no load. EGR valve should be closed and should not lift up.

Overall function checks

Circuit Diagram:

Diagnostic Chart (Part 1 Of 2):

Diagnostic Chart (Part 2 Of 2):