Diagnostic Test

WARNING: This page is about a different car, the 2009 Dodge Caliber. However, it is still accessible from the selected car via links, so may be relevant.

(A931) FUSED B+ CIRCUIT (PCM)

Fig 1: Checking Fused B(+) Circuit Using 12-Volt Test Light Connected To Ground
Courtesy of CHRYSLER LLC

NOTE: The scan tool and cable must be operating properly for the results of this test to be valid.

NOTE: Make sure the ignition switch was on while trying to communicate with the PCM.
1. Turn the ignition off.
2. Disconnect the C1 PCM harness connectors.
  NOTE: When checking circuits at the Powertrain Control Module (PCM), be careful not to damage or distort the connector terminals. Improper measurement technique could result in poor pin to terminal contact.
3. Using a 12-volt test light connected to ground, probe the (A931) Fused B+ circuit in the PCM harness connector.
  NOTE: The test light should be illuminated and bright. Compared the brightness to that of a direct connection to the battery.
  
  Does the test light illuminate brightly?
  
  Yes
  - Go to Step 2.
  No
  - Repair the open or short to ground in the (A931) Fused B+ circuit. Inspect and replace fuses as necessary.
  - Perform the PCM Verification Test. Refer to DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
(F202) IGNITION SWITCH OUTPUT (RUN-START) CIRCUITS (PCM)

Fig 2: Checking Ignition Switch Output Circuit Using 12-Volt Test Light Connected To Ground
Courtesy of CHRYSLER LLC
1. Turn the ignition on.
  NOTE: When checking circuits at the Powertrain Control Module (PCM), be careful not to damage or distort the connector terminals. Improper measurement technique could result in poor pin to terminal contact.
2. Using a 12-volt test light connected to ground, probe the (F202) Fused Ignition Switch Output circuit in the PCM harness connector.
3. Turn the ignition to run.
  NOTE: The test light should be illuminated and bright. Compared the brightness to that of a direct connection to the battery.
  
  Does the test light illuminate brightly?
  
  Yes
  - Go to Step 3.
  No
  - Repair the (F202) Ignition Switch Output circuits. Inspect and replace fuses as necessary.
  - Perform the PCM Verification Test. Refer to DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
(Z925) GROUND CIRCUITS (PCM)

Fig 3: Checking Ground Circuit Using 12-Volt Test Light Connected To 12-Volts
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
  NOTE: When checking circuits at the Powertrain Control Module (PCM), be careful not to damage or distort the connector terminals. Improper measurement technique could result in poor pin to terminal contact.
2. Using a 12-volt test light connected to battery voltage, probe both the (Z925) PCM ground circuits
  NOTE: The test light should be illuminated and bright. Compared the brightness to that of a direct connection to the battery.
  
  Does the test light illuminate brightly at both terminals?
  
  Yes
  - Go to Step 4.
  No
  - Repair the Ground circuit(s).
  - Perform the PCM Verification Test. Refer to DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
(A14) FUSED B+ CIRCUIT (MAIN RELAY)

Fig 4: Checking Fused B+ Circuit (Main Relay) Circuit
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Remove the Main Relay.
3. Using a 12-volt test light connected to ground, probe the (A14) Fused B+ circuit at the Main Relay terminal.
  NOTE: The test light should be illuminated and bright. Compared the brightness to that of a direct connection to the battery.
  
  Does the test light illuminate brightly?
  
  Yes
  - Go to Step 5.
  No
  - Repair the (A14) Fused B+ circuit.
  - Perform the PCM Verification Test. Refer to DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
(A935) FUSED B+ CIRCUIT (MAIN RELAY)

Fig 5: Checking Fused B+ Circuit (Main Relay)
Courtesy of CHRYSLER LLC
1. Using a 12-volt test light connected to ground, probe the (A935) Fused B+ circuit at the Main Relay terminal.
  NOTE: The test light should be illuminated and bright. Compared the brightness to that of a direct connection to the battery.
  
  Does the test light illuminate brightly?
  
  Yes
  - Go to Step 6.
  No
  - Repair the (A935) Fused B+ circuit.
  - Perform the PCM Verification Test. Refer to DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
(F342) MAIN RELAY OUTPUT CIRCUITS

Fig 6: Checking Main Relay Output Circuit
Courtesy of CHRYSLER LLC
1. Turn the ignition on.
2. Using a jumper wire, jumper across the Main Relay from (K542) Main Relay Output circuit and the (A14) Fused B+ circuit.
  NOTE: When checking circuits at the Powertrain Control Module (PCM), be careful not to damage or distort the connector terminals. Improper measurement technique could result in poor pin to terminal contact.
3. With a 12-volt test light connected to ground, probe the (F342) Main Relay Output circuits in the PCM harness connector.
  NOTE: The test light should be illuminated and bright. Compared the brightness to that of a direct connection to the battery.
  
  Does the test light illuminate brightly at both terminals?
  
  Yes
  - Go to Step 8.
  No
  - Go to Step 7.
(K542) MAIN RELAY OUTPUT CIRCUIT

Fig 7: Checking Main Relay Output Circuit
Courtesy of CHRYSLER LLC
1. Jumper wire still installed.
2. Disconnect the C8 TIPM harness connector.
3. Using a 12-volt test light connected to ground, probe the (K542) Main Relay Output circuit in the TIPM harness connector.
  NOTE: The test light should be illuminated and bright. Compared the brightness to that of a direct connection to the battery.
  
  Does the test light illuminate brightly?
  
  Yes
  - Repair the (F342) Main Relay Output circuit(s).
  - Perform the PCM Verification Test. Refer to DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
  No
  - Repair the (K542) Main Relay Output circuit between the TIPM and the Main Relay. Inspect the related fuses.
  - Perform the PCM Verification Test. Refer to DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
MAIN RELAY OUTPUT
1. Turn the ignition off.
2. Remove one end of the jumper wire.
3. Connect the PCM harness connector.
4. Turn the ignition on.
5. Return the jumper wire across the Main Relay.
6. Using a scan tool, attempt to communication with the PCM.
  Were you able to communication with the PCM?
  
  Yes
  - Go to Step 9.
  No
  - Go to Step 11.
MAIN RELAY

Fig 8: Checking Main Relay Control Circuit
Courtesy of CHRYSLER LLC

NOTE: To continue the following test, leave the jumper wire in place with the ignition on.
1. Using the scan tool, actuate the Main Relay.
2. Using a 12-volt test light connected to battery voltage, probe the (K51) Main Relay Control circuit in the Main Relay connector.
  Does the test light illuminate and flash on and off?
  
  Yes
  - Replace the Main Relay.
  - Perform the PCM Verification Test. Refer to DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
  No
  - Go to Step 10.
(K51) MAIN RELAY CONTROL CIRCUIT

Fig 9: Checking Main Relay Control Circuit
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Disconnect the PCM harness connector.
3. Disconnect the C1 PCM harness connector.
  NOTE: When checking circuits at the Powertrain Control Module (PCM), be careful not to damage or distort the connector terminals. Improper measurement technique could result in poor pin to terminal contact.
4. Measure the resistance of the (K51) Main Relay Control circuit between the PCM harness connector and the Main relay connector.
  Is the resistance below 5.0 ohms?
  
  Yes
  - Repair the open in the (K51) Main Relay Control circuit.
  - Perform the PCM Verification Test. Refer to DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
  No
  - Replace and program the Powertrain Control Module per Service Information.
  - Perform the PCM Verification Test. Refer to DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
(D65) CAN C BUS (+) CIRCUIT OPEN

Fig 10: Measuring Resistance Of CAN C Bus (+) Circuit Between TIPM Harness Connector & PCM C1 Harness Connector
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Disconnect the TIPM harness connector.
  NOTE: When checking circuits at the Powertrain Control Module (PCM), be careful not to damage or distort the connector terminals. Improper measurement technique could result in poor pin to terminal contact.
3. Measure the resistance of the (D65) CAN C Bus (+) circuit between the TIPM connector and the PCM harness connector.
  Is the resistance below 5.0 ohms?
  
  Yes
  - Go to Step 12.
  No
  - Repair the (D65) CAN C Bus (+) circuit for an open.
  - Perform the PCM Verification Test. Refer to DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
(D64) CAN C BUS (-) CIRCUIT OPEN

Fig 11: Measuring Resistance Of CAN C Bus (-) Circuit Between TIPM C3 Harness Connector & PCM C1 Harness Connector
Courtesy of CHRYSLER LLC

NOTE: When checking circuits at the Powertrain Control Module (PCM), be careful not to damage or distort the connector terminals. Improper measurement technique could result in poor pin to terminal contact.
1. Measure the resistance of the (D64) CAN C Bus (-) circuit between the TIPM connector and the PCM harness connector.
  Is the resistance below 5.0 ohms?
  
  Yes
  - Replace and program the Powertrain Control Module in accordance with the service information.
  - Perform the PCM Verification Test. Refer to DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
  No
  - Repair the (D64) CAN C Bus (-) circuit for an open.
  - Perform the PCM Verification Test. Refer to DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .