Diagnostic Test

WARNING: This page is about a different car, the 2007 Chrysler PT Cruiser. However, it is still accessible from the selected car via links, so may be relevant.

1) TEST FOR INTERMITTENT CONDITION
Turn the ignition on.

NOTE: Ensure the IOD fuse is installed and battery voltage is between 10.0 and 16.0 volts.

With the scan tool, select ECU view.

NOTE: A red X will be next to the module that is not communicating, indicating that the module is not active on the Bus network. A green check indicates that the module is active on the Bus network.

NOTE: Check the TIPM for any active ignition related DTCs, perform DTC before proceeding.

Does the scan tool display a red X next to the module?

Yes
1. Go to step 2).
No
1. The no response condition is not present at this time. Using the wiring diagram/schematic as a guide, inspect the wiring for chafed, pierced, pinched, and partially broken wires and the wiring harness connectors for broken, bent, pushed out, and corroded terminals.
2) ATTEMPT TO ESTABLISH COMMUNICATIONS WITH THE PCM
With the scan tool, select ECU view.

Does the scan tool also display a red X next to the PCM?

Yes
1. Go to step 6).
No
1. Go to step 3).
3) (Z902) (Z999) GROUND CIRCUIT OPEN

Fig 1: Checking For Open In Ground Circuit With 12-Volt Test Light
Courtesy of CHRYSLER LLC

Turn the ignition off.

Disconnect the Gateway Module harness connectors.

Using a 12-volt test light connected to 12-volts, check the (Z902) and (Z999) ground circuits.

Does the test light illuminate brightly for each circuit?

Yes
1. Go to step 4).
No
1. Repair the ground circuit for an open.
2. Perform BODY VERIFICATION TEST - VER 1 .
4) (F902) FUSED IGNITION SWITCH OUTPUT CIRCUIT OPEN OR SHORTED

Fig 2: Checking Fused Ignition Switch Output Circuit With 12-Volt Test Light
Courtesy of CHRYSLER LLC

Turn the ignition on.

Using a 12-volt test light connected to ground, check the (F902) Fused Ignition Switch Output circuit.

Does the test light illuminate brightly?

Yes
1. Go to step 5).
No
1. Repair the (F902) Fused Ignition Switch Output circuit for an open or short.
2. Perform BODY VERIFICATION TEST - VER 1 .
5) (D25) PCI Bus CIRCUIT OPEN

Fig 3: Measuring Resistance Of PCI Bus Circuit
Courtesy of CHRYSLER LLC

Turn the ignition off.

Disconnect the scan tool from the DLC.

Measure the resistance of the (D25) PCI Bus circuit between the DLC and the Gateway connector.

Is the resistance below 5.0 ohms?

Yes
1. Replace the Gateway Module in accordance with the service information.
2. Perform BODY VERIFICATION TEST - VER 1 .
No
1. Repair the (D25) PCI Bus circuit for an open.
2. Perform BODY VERIFICATION TEST - VER 1 .
6) (D25) PCI BUS CIRCUIT SHORTED TO GROUND

Fig 4: Measuring Resistance Between Ground & PCI Bus Circuit
Courtesy of CHRYSLER LLC

Turn the ignition off.

Disconnect the Gateway Module C1 harness connector.

Measure the resistance between ground and the (D25) PCI Bus circuit.

Is the resistance below 100.0 ohms?

Yes
1. Disconnect the PCM harness connector, if the short is eliminated, replace the PCM in accordance with the service information. If not, repair the (D25) PCI Bus circuit for a short to ground.
2. Perform BODY VERIFICATION TEST - VER 1 .
No
1. Go to step 7).
7) (D25) PCI BUS CIRCUIT SHORTED TO VOLTAGE

Fig 5: Measuring Voltage Of PCI Bus Circuit
Courtesy of CHRYSLER LLC

Turn the ignition on.

Measure the voltage of the (D25) PCI Bus circuit.

Is the voltage steadily above 8.0 volts?

Yes
1. Disconnect the PCM harness connector, if the short is eliminated, replace the PCM in accordance with the service information. If not, repair the (D25) PCI Bus circuit for a short to voltage.
2. Perform BODY VERIFICATION TEST - VER 1 .
No
1. Go to step 8).
8) (D25) PCI BUS CIRCUIT OPEN

Fig 6: Measuring Resistance Of PCI Bus Circuit
Courtesy of CHRYSLER LLC

Turn the ignition off.

Measure the resistance of the (D25) PCI Bus circuit between the DLC and the Gateway connector.

Is the resistance below 5.0 ohms?

Yes
1. Replace the Gateway Module in accordance with the service information.
2. Perform BODY VERIFICATION TEST - VER 1 .
No
1. Repair the (D25) PCI Bus circuit for an open.
2. Perform BODY VERIFICATION TEST - VER 1 .