P0403-EGR SOLENOID CIRCUIT
For a complete wiring diagram Refer to Section 8W.
Possible Causes
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(Z906) EGR SOLENOID GROUND CIRCUIT OPEN
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(K35) EGR SOLENOID CONTROL CIRCUIT SHORTED TO BATTERY VOLTAGE
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(K35) EGR SOLENOID CONTROL CIRCUIT SHORTED TO GROUND
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(K35) EGR SOLENOID CONTROL CIRCUIT SHORTED TO THE (K900) SENSOR GROUND CIRCUIT
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(K35) EGR SOLENOID CONTROL CIRCUIT OPEN
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EGR SOLENOID ASSEMBLY
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PCM
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Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding.
(Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
Diagnostic Test
1.
ACTIVE DTC
Ignition on, engine not running.
With a scan tool, select View DTCs.
Is the DTC Active at this time?
Yes
No
2.
EGR SOLENOID ASSEMBLY
Turn the ignition off.
Disconnect the EGR Solenoid harness connector.
Ignition on, engine not running.
Turn off all accessories.
Using a 12-volt test light connected to the (Z906) EGR Solenoid ground circuit, probe the (K35) EGR Solenoid Control circuit.
With a scan tool, actuate the EGR solenoid.
Does the 12-volt test light flash on and off?
Yes
No
3.
(Z906) EGR SOLENOID GROUND CIRCUIT OPEN
Turn the ignition off.
Using a 12-volt test light connected to the 12-volts, probe the (Z906) EGR Solenoid ground circuit in the EGR Solenoid harness connector.
Does the test light illuminate brightly?
Yes
No
4.
(K35) EGR SOLENOID CONTROL CIRCUIT SHORTED TO BATTERY VOLTAGE
Ignition on, engine not running.
Disconnect the C2 PCM harness connector.
Measure the voltage on the (K35) EGR Solenoid Control circuit in the EGR Solenoid connector.
Is the voltage above 1.0 volt?
Yes
No
5.
(K35) EGR SOLENOID CONTROL CIRCUIT SHORTED TO GROUND
Turn the ignition off.
Measure the resistance between ground and the (K35) EGR Solenoid Control circuit in the EGR Solenoid harness connector.
Is the resistance below 100 ohms?
Yes
No
6.
(K35) EGR SOLENOID CONTROL CIRCUIT SHORTED TO THE (K900) SENSOR GROUND CIRCUIT
Measure the resistance between the (K35) EGR Solenoid Control circuit and the (K900) Sensor ground circuit in the EGR Solenoid connector.
Is the resistance below 5.0 ohms?
Yes
No
7.
(K35) EGR SOLENOID CONTROL CIRCUIT OPEN
CAUTION:
Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller Special
Tool #8815 to perform diagnosis.
Measure the resistance of the (K35) EGR Solenoid Control circuit from the EGR Solenoid harness connector to the appropriate terminal of special tool #8815.
Is the resistance below 5.0 ohms?
Yes
No
8.
PCM
NOTE:
Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.
Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits.
Were there any problems found?
Yes
No