Powertrain Control Module (PCM) (Gasoline)
The PCM is on the SCP communication network. The PCM controls the engine for better fuel economy, emissions control, failure mode detection and storage. If one of the bus wires becomes shorted to ground or voltage, or if some but not all termination resistors are lost, communications can continue. Check circuits 915 (PK/LB) and 914 (TN/OG) between the PCM C175 and the DLC C251. Total resistance values must not be more than 5 ohms. If the resistance is more than 5 ohms there is an open circuit in the SCP network, damage to the DLC C251, damage to the PCM C175, or a problem in the in-line connector. For additional information, refer to the INTRODUCTION - CNG, FLEX-FUEL & GASOLINE .
Powertrain Control Module (PCM) (Diesel)
The PCM is on the CAN communication network. The PCM controls the engine for better fuel economy, emissions control, failure mode detection and storage. If one of the bus wires becomes shorted to ground or voltage, or if some but not all termination resistors are lost, communications can continue. Check circuits 3072 (PK/YE) and 3073 (RD/WH) between the PCM C176a and the DLC C251. Total resistance values must not be more than 5 ohms. If the resistance is more than 5 ohms there is an open circuit in the CAN network, damage to the DLC C251, damage to the PCM C176a, or a problem in the in-line connector. For additional information, refer to the INTRODUCTION - DIESEL MODELS .
Natural Gas Alternative Fuel Control Module (AFCM)
The AFCM is on the SCP communication network. The AFCM controls the fuel and ignition systems for better fuel economy, emissions control, failure mode detection and storage. If one of the bus wires becomes shorted to ground or voltage, or if some but not all termination resistors are lost, communications can continue. Check circuits 915 (PK/LB) and 914 (TN/OG) between the AFCM C1009 and the DLC C251. Total resistance values must not be more than 5 ohms. If the resistance is more than 5 ohms there is an open circuit in the SCP network, damage to the DLC C251, damage to the AFCM C1009, or a problem in the inline connector. For additional information, refer to the INTRODUCTION - CNG, FLEX-FUEL & GASOLINE .
Instrument Cluster
The instrument cluster is on the SCP communications network. It is an analog face cluster with a digital odometer. The instrument cluster displays a variety of information. Check circuits 915 (PK/LB) and 914 (TN/OG) between the instrument cluster C220a and the DLC C251. Total resistance values must not be more than 5 ohms. If the resistance is more than 5 ohms there is an open circuit in the SCP network, damage to the DLC C251, damage to the instrument cluster C220a, or a problem in the in-line connector. For additional information, refer to INSTRUMENT CLUSTER- CONVENTIONAL .
Restraint Control Module (RCM)
The RCM is on the ISO 9141 network. The RCM controls the deployment of the air bags based on sensor input. The ISO communication network will not function if the wire is shorted to ground or battery voltage. Check the network circuit between the RCM C310a and the DLC C251. Total resistance value must not be more than 5 ohms. If the resistance is more than 5 ohms, there is an open circuit in the ISO network, damage to the DLC C251, damage to the RCM C310a, or a problem in the in-line connector. For additional information, refer to AIR BAG RESTRAINT SYSTEMS .
Anti-Lock Brake System (ABS) Module
The ABS module is on the ISO 9141 communication network. The ABS module controls the brake pressure to the four wheels to keep the vehicle under control while braking. The ISO communication network will not function if the wire is shorted to ground or battery voltage. Check the network circuit between the ABS module C135 and the DLC C251. Total resistance value must not be more than 5 ohms. If the resistance is more than 5 ohms, there is an open circuit in the ISO network, damage to the DLC C251, damage to the ABS C135, or a problem in the in-line connector. For additional information, refer to ANTI-LOCK CONTROL .
Vehicle Security Module
The vehicle security module is on the ISO 9141 network. The vehicle security module controls the remote keyless entry (RKE) function as well as the power door locks. The ISO communication network will not function if the wire is shorted to ground or battery voltage. Check the network circuit between the vehicle security module C203b and the DLC C251. Total resistance value must not be more than 5 ohms. If the resistance is more than 5 ohms, there is an open circuit in the ISO network, damage to the DLC C251, damage to the vehicle security module C203b, or a problem in the in-line connector. For additional information, refer to MULTIFUNCTION ELECTRONIC MODULE .
Scheme 2
- Verify the customer concern.
- Visually inspect for obvious signs of mechanical or electrical damage. VISUAL INSPECTION CHART
- If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
- If the cause is not visually evident, connect the diagnostic tool to the data link connector and select the vehicle to be tested from the diagnostic tool menu. If the diagnostic tool does not communicate with the vehicle: Check that the program card is correctly installed. Check the connections to the vehicle. Check the ignition switch position.
- If the diagnostic tool still does not communicate with the vehicle, refer to the diagnostic tool operating manual.
- Perform PINPOINT TEST PC: DATA LINK DIAGNOSTICS TEST. (Scheme 3)
System Pre Check
PINPOINT TEST PC: DATA LINK DIAGNOSTICS TEST
