PINPOINT TEST G187746P3

PINPOINT TEST G187746p3 : Diagnostic Trouble Code (DTC) P0406 indicates exhaust gas recirculation (EGR) valve malfunction, short to ground/open circuit.

G187746t13 : CHECK FOR A SHORT TO GROUND
1. Disconnect the EGR valve electrical connectors PI 15.
2. Disconnect the engine control module (ECM) electrical connectors PI 1.
3. Measure the resistance between the EGR valve electrical connector PI 15 pin 4 (YU) and GROUND.

- Is the resistance less than 10,000 Ohms?

-> YES
REPAIR the circuit between EGR valve electrical connector PI 15 pin 4 (YU) and ECM electrical connector PI 1 pin 57 (YU). CLEAR DTC. To validate fix drive vehicle between 30 mph (48 kph) and 40 mph (64 kph). Allow vehicle to idle for 2 minutes.

-> NO
GO to Pinpoint Test G187746t14.

G187746t14 : CHECK FOR AN OPEN CIRCUIT
1. Measure the resistance between the EGR valve electrical connector PI 15 pin 4 (YU) and ECM electrical connector PI 1 pin 57 (YU).

- Is the resistance more than 5.0 Ohms?

-> YES
REPAIR the circuit between EGR valve electrical connector PI 15 pin 4 (YU) and ECM electrical connector PI 1 pin 57 (YU). CLEAR DTC. To validate fix drive vehicle between 30 mph (48 kph) and 40 mph (64 kph). Allow vehicle to idle for 2 minutes.

-> NO
GO to Pinpoint Test G187746t15.

G187746t15 : CHECK FOR A SHORT TO GROUND
1. Measure the resistance between the EGR valve electrical connector PI 15 pin 1 (YG) and GROUND.

- Is the resistance less than 10,000 Ohms?

-> YES
REPAIR the circuit between EGR valve electrical connector PI 15 pin 1 (YG) and ECM electrical connector PI 1 pin 58 (YG). CLEAR DTC. To validate fix drive vehicle between 30 mph (48 kph) and 40 mph (64 kph). Allow vehicle to idle for 2 minutes.

-> NO
GO to Pinpoint Test G187746t16

G187746t16 : CHECK FOR AN OPEN CIRCUIT
1. Measure the resistance between the EGR valve electrical connector PI 15 pin 1 (YG) and ECM electrical connector PI 1 pin 58 (YG).

- Is the resistance more than 5.0 Ohms?

-> YES
REPAIR the circuit between EGR valve electrical connector PI 15 pin 1 (YG) and ECM electrical connector PI 1 pin 58 (YG). CLEAR DTC. To validate fix drive vehicle between 30 mph (48 kph) and 40 mph (64 kph). Allow vehicle to idle for 2 minutes.

-> NO
GO to Pinpoint Test G187746t17.

G187746t17 : CHECK FOR A SHORT TO GROUND
1. Measure the resistance between the EGR valve electrical connector PI 15 pin 6 (YR) and GROUND.

- Is the resistance less than 10,000 Ohms?

-> YES
REPAIR the circuit between EGR valve electrical connector PI 15 pin 6 (YR) and ECM electrical connector PI 1 pin 59 (YR). CLEAR DTC. TEST the system for normal operation.

-> NO
GO to Pinpoint Test G187746t18.

G187746t18 : CHECK FOR AN OPEN CIRCUIT
1. Measure the resistance between the EGR valve electrical connector PI 15 pin 6 (YR) and ECM electrical connector PI 1 pin 59 (YR).

- Is the resistance more than 5.0 Ohms?

-> YES
REPAIR the circuit between EGR valve electrical connector PI 15 pin 6 (YR) and ECM electrical connector PI 1 pin 59 (YR). CLEAR DTC. TEST the system for normal operation.

-> NO
GO to Pinpoint Test G187746t22.

G187746t22 : CHECK FOR A SHORT TO GROUND
1. Measure the resistance between the EGR valve electrical connector PI 15 pin 3 (YU) and GROUND.

- Is the resistance less than 10,000 Ohms?

-> YES
REPAIR the circuit between EGR valve electrical connector PI 15 pin 3 (YU) and ECM electrical connector PI 1 pin 60 (YU). CLEAR DTC. TEST the system for normal operation.

-> NO
GO to Pinpoint Test G187746t23.

G187746t23 : CHECK FOR AN OPEN CIRCUIT
1. Measure the resistance between the EGR valve electrical connector PI 15 pin 3 (Yu) and ECM electrical connector PI 1 pin 60 (YU).

- Is the resistance more than 5.0 Ohms?

-> YES
REPAIR the circuit between EGR valve electrical connector PI 15 pin 3 (YU) and ECM electrical connector PI 1 pin 60 (YU). CLEAR DTC. TEST the system for normal operation.

-> NO
INSTALL a new EGR valve. CLEAR DTC. TEST the system for normal operation. If DTC is repeated INSTALL a new ECM. CLEAR DTC. TEST the system for normal operation.