P2143

DTC Code	DTC Name
P2143	Electric EGR Valve H Bridge, Electrical Check, Over Current Check

DESCRIPTION

The ECM adjusts the opening angle of the EGR valve and throttle valve (for EGR) to control the EGR (Exhaust Gas Recirculation) amount to reduce emissions.
When the EGR valve is closed, there is no EGR flow. (fig. 1)
When the EGR valve is opened, exhaust gas flows to the intake manifold. (fig. 2)
The ECM uses a duty cycle to operate the motor for the EGR valve.

DTC No.	DTC Detection Condition	Trouble Area	Possible to Detect
P2143	Either the following condition (a) or (b) is met. (a) Over current continues for 2 sec. or more. (b) H bridge electrical check continues for 2 sec. (1 trip detection logic)	EGR valve EGR valve (EGR motor) circuit ECM	ON	ON

DTC No.

DTC Detection Condition

Trouble Area

Possible to Detect

Ignition Switch

Engine Run

P2143

Either the following condition (a) or (b) is met.

(a) Over current continues for 2 sec. or more.

(b) H bridge electrical check continues for 2 sec.

(1 trip detection logic)

EGR valve
EGR valve (EGR motor) circuit
ECM

ON

Reference:

The waveform between terminals EGR+ and EGR- of the ECM connectors.

FAIL-SAFE

DTC No.	Fail-safe Operation	Fail-safe Deactivation Condition
P2143	Stops the EGR.	Next engine start.

WIRING DIAGRAM

INSPECTION PROCEDURE

Tech Tips

If the ECM is replaced, variant coding (variant coding indicates the presence of vehicle accessory items, A/C, etc.) should always be performed Click here.
Before removing the ECM and the peripheral parts, wait at least 3 minute after turning the ignition switch off (If the cooling fan is operating, remove the ECM and the peripheral parts after the fan stops.).

PROCEDURE

PERFORM ACTIVE TEST BY INTELLIGENT TESTER (EGR MOTOR)
1. Connect the intelligent tester to the DLC3.
2. Turn the ignition switch to the ON position and turn the intelligent tester on.
3. Clear the DTC Click here.
4. Select the following menu items: Powertrain / Engine and ECT / Active Test / EGR Valve.
5. Check if operating sound can be heard from the EGR valve.
  
  OK
  
  Operating sound can be heard from the EGR valve.
NG
INSPECT EGR VALVE Click here

OK

CHECK FOR INTERMITTENT PROBLEMS

OK
Operating sound can be heard from the EGR valve.

INSPECT EGR VALVE

Disconnect the B39 EGR valve connector.

Measure the resistance according to the value(s) in the table below.

Standard resistance

Tester Connection	Specified Condition
2 - 3	2 to 8 Ω

NG

REPLACE EGR VALVE

OK

CHECK HARNESS AND CONNECTOR (EGR VALVE - ECM)

Disconnect the B53 ECM connector.
Disconnect the B39 EGR valve connector.

Measure the resistance according to the value(s) in the table below.

Standard resistance

Check for open

Tester Connection	Specified Condition
EGR+ (B53-31) - EGR+ (B39-3)	Below 1 Ω
EGR- (B53-29) - EGR- (B39-2)	Below 1 Ω

Check for short

Tester Connection	Specified Condition
EGR+ (B53-31) or EGR+ (B39-3) - Body ground	10 kΩ or higher
EGR- (B53-29) or EGR- (B39-2) - Body ground	10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

REPLACE ECM

ECD SYSTEM, Diagnostic DTC:P2143