Diagnostic Test

WARNING: This page is about a different car, the 2014 RAM 1500. However, it is still accessible from the selected car via links, so may be relevant.

ACTIVE DTC
NOTE:
If DTCs P258C or P258D are present, perform the Diagnostics for those DTCs before continuing with this one.
1. Ignition on, engine not running.
2. With the scan tool, select View DTCs.
  Is the DTC Active at this time?
  
  Yes
  - Go To 2
  No
  - Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to INTERMITTENT DTC .
CHECK THE FUSED RUN/START CIRCUIT

Fig 1: Checking Fused Run/Start Circuit
Courtesy of CHRYSLER GROUP, LLC
1. Turn the ignition off.
2. Remove the EVP Relay from the relay connector in the PDC.
3. Ignition on, engine not running.
4. Using a 12-volt test light connected to ground, probe the Fused RUN/START circuit (terminal 85) at the EVP Relay connector.
  Does the test light illuminate brightly?
  
  Yes
  - Go To 3
  No
  - Replace the PDC in accordance with the service information.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to PCM VERIFICATION TEST .
EVP RELAY
1. Measure the resistance of the EVP Relay Coil.
  NOTE:
  Measure across terminals 85 and 86 of the relay.
  
  Is the resistance between 60 to 80 Ohms?
  
  Yes
  - Go To 4
  No
  - Verify that there is good pin to terminal contact in the EVP Relay and Powertrain Control Module connectors. If OK, replace the EVP Relay.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to PCM VERIFICATION TEST .
CHECK THE (T109) EVP SUPPLY CIRCUIT FOR AN OPEN/HIGH RESISTANCE
1. Disconnect the Electric Vacuum Pump harness connector.
2. Disconnect the PDC C3 harness connector.
3. Measure the resistance of the (T109) EVP Supply circuit between the Electric Vacuum Pump harness connector and the PDC C3 harness connector.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Go To 5
  No
  - Repair the (T109) EVP Supply circuit for an open/high resistance.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to PCM VERIFICATION TEST .
CHECK THE (T109) EVP SUPPLY CIRCUIT FOR A SHORT TO GROUND
1. Measure the resistance between ground and the (T109) EVP Supply circuit at the PDC C3 harness connector.
  Is the resistance above 10k Ohms?
  
  Yes
  - Go To 6
  No
  - Repair the (T109) EVP Supply circuit for a short to ground.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to PCM VERIFICATION TEST .
CHECK THE EVP GROUND CIRCUIT FOR AN OPEN/HIGH RESISTANCE
1. Measure the resistance between ground and the (Z906) EVP Ground circuit at the Electric Vacuum Pump harness connector.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Go To 7
  No
  - Repair the (Z906) EVP Ground circuit for an open/high resistance.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to PCM VERIFICATION TEST .
POWER DISTRIBUTION CENTER
1. Measure the resistance of the (T109) EVP Supply circuit between the EVP Relay and the PDC C3 harness connector.
  Is the resistance below 5.0 Ohms?
  
  Yes
  - Go To 8
  No
  - Replace the Power Distribution Center in accordance with the service information.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to PCM VERIFICATION TEST .
POWERTRAIN CONTROL MODULE (PCM)
1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Electric Vacuum Pump, PDC and the Powertrain Control Module (PCM).
2. Look for any chafed, pierced, pinched or partially broken wires.
3. Look for broken, bent, pushed out or corroded terminals.
4. Monitor the scan tool data relative to this circuit and wiggle test the wiring and connectors.
5. Look for the data to change or for the DTC to reset during the wiggle test.
6. Perform any Technical Service Bulletins that may apply.
  Were any problems found?
  
  Yes
  - Repair as necessary.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to PCM VERIFICATION TEST .
  No
  - Replace the Powertrain Control Module (PCM) in accordance with the service information. Refer to MODULE, POWERTRAIN CONTROL, REMOVAL .
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to PCM VERIFICATION TEST .