P2142-EGR AIR FLOW CONTROL VALVE SHORT CIRCUIT

For a complete wiring diagram Refer to Section 8W

When Monitored:
With the ignition on and the ECM EGR Air Flow Control Valve command on.
Set Condition:
The ECM detects excessive current on the EGR Air Flow Control Valve Control circuit for 0.5 second.

Possible Causes

INTERMITTENT CONDITION

EGR AIR FLOW CONTROL VALVE

EGR AIR FLOW CONTROL VALVE CONTROL SHORTED TO VOLTAGE

ENGINE CONTROL MODULE - INTERNAL SHORT TO VOLTAGE

Diagnostic Test

1.CHECK FOR ACTIVE DTC

NOTE: If the ECM detects and stores a DTC, the ECM also stores the engine/vehicle operating conditions under which the DTC was set. Some of these conditions are displayed on the scan tool at the same time the DTC is displayed.

NOTE: Before erasing stored DTCs, record these conditions. Attempting to duplicate these conditions may assist when checking for an active DTC.

Did this DTC set again?

Yes

Go To2

Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)

2.EGR AIR FLOW CONTROL VALVE

Does the scan tool display P1140 EGR AIR FLOW CONTROL VALVE OPEN CIRCUIT?

Yes

Replace the EGR Air Flow Control Valve.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).

Go To3

3.EGR AIR FLOW CONTROL VALVE SHORTED TO VOLTAGE

Is the voltage below 1.0 volt?

Yes

Replace and program the Engine Control Module in accordance with the Service Information.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).

Repair the EGR Air Flow Control Valve Control circuit for a short to voltage.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).