Diagnostic Test

WARNING: This page is about a different car, the 2005 Jeep Grand Cherokee. However, it is still accessible from the selected car via links, so may be relevant.

1) ACTIVE DTC
Ignition on, engine not running.

With a scan tool, read DTCs.

Is the DTC active at this time?

Yes
1. Go To step 2).
No
1. Refer to INTERMITTENT CONDITION .
2. Perform POWERTRAIN VERIFICATION TEST .
2) EGR SOLENOID ASSEMBLY

Fig 1: Checking EGR Solenoid Assembly
Courtesy of DAIMLERCHRYSLER CORP.

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 (Z42) EGR Solenoid ground circuit, probe the (K34) EGR Solenoid Control circuit.

With a scan tool, actuate the EGR solenoid.

Does the 12-volt test light flash on and off?

Yes
1. Replace the EGR Solenoid Assembly.
2. Perform POWERTRAIN VERIFICATION TEST .
No
1. Go To step 3).
3) (Z42) EGR SOLENOID GROUND CIRCUIT OPEN

Fig 2: Checking EGR Solenoid Ground Circuit
Courtesy of DAIMLERCHRYSLER CORP.

Turn the ignition off.

Using a 12-volt test light connected to the 12-volts, probe the (Z42) EGR Solenoid ground circuit in the EGR Solenoid harness connector.

Does the test light illuminate brightly?

Yes
1. Go To step 4).
No
1. Repair the open in the (Z42) EGR Solenoid ground circuit.
2. Perform POWERTRAIN VERIFICATION TEST .
4) (K35) EGR SOLENOID CONTROL CIRCUIT SHORTED TO BATTERY VOLTAGE

Fig 3: Checking EGR Solenoid Control Circuit
Courtesy of DAIMLERCHRYSLER CORP.

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
1. Repair the short to battery voltage in the (K35) EGR Solenoid Control circuit.
2. Perform POWERTRAIN VERIFICATION TEST .
No
1. Go To step 5).
5) (K35) EGR SOLENOID CONTROL CIRCUIT SHORTED TO GROUND

Fig 4: Checking EGR Solenoid Control Circuit
Courtesy of DAIMLERCHRYSLER CORP.

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
1. Repair the short to ground in the (K35) EGR Solenoid Control circuit.
2. Perform POWERTRAIN VERIFICATION TEST .
No
1. Go To step 6).
6) (K35) EGR SOLENOID CONTROL CIRCUIT SHORTED TO THE (K900) SENSOR GROUND CIRCUIT

Fig 5: Checking EGR Solenoid Control Circuit & Sensor Ground Circuit
Courtesy of DAIMLERCHRYSLER CORP.

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
1. Repair the short between the (K900) Sensor ground circuit and the (K35) EGR Solenoid Control circuit.
2. Perform POWERTRAIN VERIFICATION TEST .
No
1. Go To step 7).
7) (K35) EGR SOLENOID CONTROL CIRCUIT OPEN

Fig 6: Checking EGR Solenoid Control Circuit
Courtesy of DAIMLERCHRYSLER CORP.

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
1. Go To step 8).
No
1. Repair the open in the (K35) EGR Solenoid Control circuit.
2. Perform POWERTRAIN VERIFICATION TEST .
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
1. Repair as necessary.
2. Perform POWERTRAIN VERIFICATION TEST .
No
1. Replace and program the Powertrain Control Module per Service Information.
2. Perform POWERTRAIN VERIFICATION TEST .