Diagnostic Test

WARNING: This page is about a different car, the 2016 Jeep Wrangler and 2015 Jeep Wrangler. However, it is still accessible from the selected car via links, so may be relevant.

CHECK FOR AN ACTIVE DTC
1. Turn the ignition on.
2. With the scan tool, read DTCs and record on the repair order.
  Is the DTC active or pending?
  
  Yes
  - Go To 2
  No
  - Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to .
CHECK THE FUSED IGNITION RUN/START CIRCUIT
1. Turn the ignition off.
2. Remove the EVP Relay from the relay connector.
3. Turn the ignition on.
4. Using a 12-volt test light connected to ground, probe the Fused Ignition RUN/START circuit (terminal 85) at the EVP Relay connector.
  Does the test light illuminate brightly?
  
  Yes
  - Go To 3
  No
  - Repair the Fused Ignition RUN/START circuit for an open.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to .
EVP RELAY
1. Turn the ignition off.
2. Measure the resistance of the EVP Relay Coil.
  NOTE:
  Measure across terminals 85 and 86 of the relay.
  
  Is the resistance between 60.0 and 80.0 Ohms?
  
  Yes
  - Go To 4
  No
  - Replace the EVP Relay.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to .
CHECK THE (T110) EVP RELAY CONTROL CIRCUIT FOR AN OPEN/HIGH RESISTANCE
1. Disconnect the PCM C1 harness connector.
2. Connect the (special tool #10436, Adapter, GPEC Diagnostic).
3. Measure the resistance of the (T110) Vacuum Pump Relay Control circuit between the EVP Relay connector and the GPEC Adaptor.
  Is the resistance below 3.0 Ohms?
  
  Yes
  - Go To 5
  No
  - Repair the (T110) Vacuum Pump Relay Control circuit for an open or high resistance.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to .
CHECK THE (T110) EVP RELAY CONTROL CIRCUIT FOR A SHORT TO GROUND
1. Check for continuity between ground and the (T110) Vacuum Pump Relay Control circuit at the EVP Relay socket.
  Is there between ground and the (T110) Vacuum Pump Relay Control circuit?
  
  Yes
  - Repair the (T110) EVP relay control circuit for a short to ground.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to .
  No
  - Go To 6
CHECK RELATED PCM AND COMPONENT CONNECTIONS
1. Perform any Service Bulletins that apply.
2. Disconnect all PCM harness connectors.
3. Disconnect all related in-line harness connections (if equipped).
4. Disconnect the related component harness connectors.
5. Inspect harness connectors, component connectors, and all male and female terminals for the following conditions:
  - Proper connector installation.
  - Damaged connector locks.
  - Corrosion.
  - Other signs of water intrusion.
  - Weather seal damage (if equipped).
  - Bent terminals.
  - Overheating due to a poor connection (terminal may be discolored due to excessive current draw).
  - Terminals that have been pushed back into the connector cavity.
  - Check for spread terminals and verify proper terminal tension.
  Repair any conditions that are found.
6. Reconnect all PCM harness connectors. Be certain that all harness connectors are fully seated and the connector locks are fully engaged.
7. Reconnect all in-line harness connectors (if equipped). Be certain that all connectors are fully seated and the connector locks are fully engaged.
8. Reconnect all related component harness connectors. Be certain that all connectors are fully seated and the connector locks are fully engaged.
9. With the scan tool, erase DTCs.
10. Test drive or operate the vehicle in accordance with the when monitored and set conditions.
11. With the scan tool, read DTCs.
  Did the DTC return?
  
  Yes
  - Replace the Powertrain Control Module in accordance with the Service information. Refer to MODULE, POWERTRAIN CONTROL [EHD,ERB] , REMOVAL MODULE, POWERTRAIN CONTROL, 2.8L DIESEL [ENS] , REMOVAL .
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to .
  No
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to .
  - Test complete.